1// © 2016 and later: Unicode, Inc. and others.
2// License & terms of use: http://www.unicode.org/copyright.html
3/*
4**********************************************************************
5* Copyright (C) 1998-2016, International Business Machines
6* Corporation and others. All Rights Reserved.
7**********************************************************************
8*
9* File unistr.h
10*
11* Modification History:
12*
13* Date Name Description
14* 09/25/98 stephen Creation.
15* 11/11/98 stephen Changed per 11/9 code review.
16* 04/20/99 stephen Overhauled per 4/16 code review.
17* 11/18/99 aliu Made to inherit from Replaceable. Added method
18* handleReplaceBetween(); other methods unchanged.
19* 06/25/01 grhoten Remove dependency on iostream.
20******************************************************************************
21*/
22
23#ifndef UNISTR_H
24#define UNISTR_H
25
26/**
27 * \file
28 * \brief C++ API: Unicode String
29 */
30
31#include "unicode/utypes.h"
32
33#if U_SHOW_CPLUSPLUS_API
34
35#include <cstddef>
36#include "unicode/char16ptr.h"
37#include "unicode/rep.h"
38#include "unicode/std_string.h"
39#include "unicode/stringpiece.h"
40#include "unicode/bytestream.h"
41
42struct UConverter; // unicode/ucnv.h
43
44#ifndef USTRING_H
45/**
46 * \ingroup ustring_ustrlen
47 */
48U_STABLE int32_t U_EXPORT2
49u_strlen(const UChar *s);
50#endif
51
52U_NAMESPACE_BEGIN
53
54#if !UCONFIG_NO_BREAK_ITERATION
55class BreakIterator; // unicode/brkiter.h
56#endif
57class Edits;
58
59U_NAMESPACE_END
60
61// Not #ifndef U_HIDE_INTERNAL_API because UnicodeString needs the UStringCaseMapper.
62/**
63 * Internal string case mapping function type.
64 * All error checking must be done.
65 * src and dest must not overlap.
66 * @internal
67 */
68typedef int32_t U_CALLCONV
69UStringCaseMapper(int32_t caseLocale, uint32_t options,
70#if !UCONFIG_NO_BREAK_ITERATION
71 icu::BreakIterator *iter,
72#endif
73 char16_t *dest, int32_t destCapacity,
74 const char16_t *src, int32_t srcLength,
75 icu::Edits *edits,
76 UErrorCode &errorCode);
77
78U_NAMESPACE_BEGIN
79
80class Locale; // unicode/locid.h
81class StringCharacterIterator;
82class UnicodeStringAppendable; // unicode/appendable.h
83
84/* The <iostream> include has been moved to unicode/ustream.h */
85
86/**
87 * Constant to be used in the UnicodeString(char *, int32_t, EInvariant) constructor
88 * which constructs a Unicode string from an invariant-character char * string.
89 * About invariant characters see utypes.h.
90 * This constructor has no runtime dependency on conversion code and is
91 * therefore recommended over ones taking a charset name string
92 * (where the empty string "" indicates invariant-character conversion).
93 *
94 * @stable ICU 3.2
95 */
96#define US_INV icu::UnicodeString::kInvariant
97
98/**
99 * Unicode String literals in C++.
100 *
101 * Note: these macros are not recommended for new code.
102 * Prior to the availability of C++11 and u"unicode string literals",
103 * these macros were provided for portability and efficiency when
104 * initializing UnicodeStrings from literals.
105 *
106 * They work only for strings that contain "invariant characters", i.e.,
107 * only latin letters, digits, and some punctuation.
108 * See utypes.h for details.
109 *
110 * The string parameter must be a C string literal.
111 * The length of the string, not including the terminating
112 * `NUL`, must be specified as a constant.
113 * @stable ICU 2.0
114 */
115#if !U_CHAR16_IS_TYPEDEF
116# define UNICODE_STRING(cs, _length) icu::UnicodeString(TRUE, u ## cs, _length)
117#else
118# define UNICODE_STRING(cs, _length) icu::UnicodeString(TRUE, (const char16_t*)u ## cs, _length)
119#endif
120
121/**
122 * Unicode String literals in C++.
123 * Dependent on the platform properties, different UnicodeString
124 * constructors should be used to create a UnicodeString object from
125 * a string literal.
126 * The macros are defined for improved performance.
127 * They work only for strings that contain "invariant characters", i.e.,
128 * only latin letters, digits, and some punctuation.
129 * See utypes.h for details.
130 *
131 * The string parameter must be a C string literal.
132 * @stable ICU 2.0
133 */
134#define UNICODE_STRING_SIMPLE(cs) UNICODE_STRING(cs, -1)
135
136/**
137 * \def UNISTR_FROM_CHAR_EXPLICIT
138 * This can be defined to be empty or "explicit".
139 * If explicit, then the UnicodeString(char16_t) and UnicodeString(UChar32)
140 * constructors are marked as explicit, preventing their inadvertent use.
141 * @stable ICU 49
142 */
143#ifndef UNISTR_FROM_CHAR_EXPLICIT
144# if defined(U_COMBINED_IMPLEMENTATION) || defined(U_COMMON_IMPLEMENTATION) || defined(U_I18N_IMPLEMENTATION) || defined(U_IO_IMPLEMENTATION)
145 // Auto-"explicit" in ICU library code.
146# define UNISTR_FROM_CHAR_EXPLICIT explicit
147# else
148 // Empty by default for source code compatibility.
149# define UNISTR_FROM_CHAR_EXPLICIT
150# endif
151#endif
152
153/**
154 * \def UNISTR_FROM_STRING_EXPLICIT
155 * This can be defined to be empty or "explicit".
156 * If explicit, then the UnicodeString(const char *) and UnicodeString(const char16_t *)
157 * constructors are marked as explicit, preventing their inadvertent use.
158 *
159 * In particular, this helps prevent accidentally depending on ICU conversion code
160 * by passing a string literal into an API with a const UnicodeString & parameter.
161 * @stable ICU 49
162 */
163#ifndef UNISTR_FROM_STRING_EXPLICIT
164# if defined(U_COMBINED_IMPLEMENTATION) || defined(U_COMMON_IMPLEMENTATION) || defined(U_I18N_IMPLEMENTATION) || defined(U_IO_IMPLEMENTATION)
165 // Auto-"explicit" in ICU library code.
166# define UNISTR_FROM_STRING_EXPLICIT explicit
167# else
168 // Empty by default for source code compatibility.
169# define UNISTR_FROM_STRING_EXPLICIT
170# endif
171#endif
172
173/**
174 * \def UNISTR_OBJECT_SIZE
175 * Desired sizeof(UnicodeString) in bytes.
176 * It should be a multiple of sizeof(pointer) to avoid unusable space for padding.
177 * The object size may want to be a multiple of 16 bytes,
178 * which is a common granularity for heap allocation.
179 *
180 * Any space inside the object beyond sizeof(vtable pointer) + 2
181 * is available for storing short strings inside the object.
182 * The bigger the object, the longer a string that can be stored inside the object,
183 * without additional heap allocation.
184 *
185 * Depending on a platform's pointer size, pointer alignment requirements,
186 * and struct padding, the compiler will usually round up sizeof(UnicodeString)
187 * to 4 * sizeof(pointer) (or 3 * sizeof(pointer) for P128 data models),
188 * to hold the fields for heap-allocated strings.
189 * Such a minimum size also ensures that the object is easily large enough
190 * to hold at least 2 char16_ts, for one supplementary code point (U16_MAX_LENGTH).
191 *
192 * sizeof(UnicodeString) >= 48 should work for all known platforms.
193 *
194 * For example, on a 64-bit machine where sizeof(vtable pointer) is 8,
195 * sizeof(UnicodeString) = 64 would leave space for
196 * (64 - sizeof(vtable pointer) - 2) / U_SIZEOF_UCHAR = (64 - 8 - 2) / 2 = 27
197 * char16_ts stored inside the object.
198 *
199 * The minimum object size on a 64-bit machine would be
200 * 4 * sizeof(pointer) = 4 * 8 = 32 bytes,
201 * and the internal buffer would hold up to 11 char16_ts in that case.
202 *
203 * @see U16_MAX_LENGTH
204 * @stable ICU 56
205 */
206#ifndef UNISTR_OBJECT_SIZE
207# define UNISTR_OBJECT_SIZE 64
208#endif
209
210/**
211 * UnicodeString is a string class that stores Unicode characters directly and provides
212 * similar functionality as the Java String and StringBuffer/StringBuilder classes.
213 * It is a concrete implementation of the abstract class Replaceable (for transliteration).
214 *
215 * The UnicodeString equivalent of std::string’s clear() is remove().
216 *
217 * A UnicodeString may "alias" an external array of characters
218 * (that is, point to it, rather than own the array)
219 * whose lifetime must then at least match the lifetime of the aliasing object.
220 * This aliasing may be preserved when returning a UnicodeString by value,
221 * depending on the compiler and the function implementation,
222 * via Return Value Optimization (RVO) or the move assignment operator.
223 * (However, the copy assignment operator does not preserve aliasing.)
224 * For details see the description of storage models at the end of the class API docs
225 * and in the User Guide chapter linked from there.
226 *
227 * The UnicodeString class is not suitable for subclassing.
228 *
229 * For an overview of Unicode strings in C and C++ see the
230 * [User Guide Strings chapter](http://userguide.icu-project.org/strings#TOC-Strings-in-C-C-).
231 *
232 * In ICU, a Unicode string consists of 16-bit Unicode *code units*.
233 * A Unicode character may be stored with either one code unit
234 * (the most common case) or with a matched pair of special code units
235 * ("surrogates"). The data type for code units is char16_t.
236 * For single-character handling, a Unicode character code *point* is a value
237 * in the range 0..0x10ffff. ICU uses the UChar32 type for code points.
238 *
239 * Indexes and offsets into and lengths of strings always count code units, not code points.
240 * This is the same as with multi-byte char* strings in traditional string handling.
241 * Operations on partial strings typically do not test for code point boundaries.
242 * If necessary, the user needs to take care of such boundaries by testing for the code unit
243 * values or by using functions like
244 * UnicodeString::getChar32Start() and UnicodeString::getChar32Limit()
245 * (or, in C, the equivalent macros U16_SET_CP_START() and U16_SET_CP_LIMIT(), see utf.h).
246 *
247 * UnicodeString methods are more lenient with regard to input parameter values
248 * than other ICU APIs. In particular:
249 * - If indexes are out of bounds for a UnicodeString object
250 * (< 0 or > length()) then they are "pinned" to the nearest boundary.
251 * - If the buffer passed to an insert/append/replace operation is owned by the
252 * target object, e.g., calling str.append(str), an extra copy may take place
253 * to ensure safety.
254 * - If primitive string pointer values (e.g., const char16_t * or char *)
255 * for input strings are NULL, then those input string parameters are treated
256 * as if they pointed to an empty string.
257 * However, this is *not* the case for char * parameters for charset names
258 * or other IDs.
259 * - Most UnicodeString methods do not take a UErrorCode parameter because
260 * there are usually very few opportunities for failure other than a shortage
261 * of memory, error codes in low-level C++ string methods would be inconvenient,
262 * and the error code as the last parameter (ICU convention) would prevent
263 * the use of default parameter values.
264 * Instead, such methods set the UnicodeString into a "bogus" state
265 * (see isBogus()) if an error occurs.
266 *
267 * In string comparisons, two UnicodeString objects that are both "bogus"
268 * compare equal (to be transitive and prevent endless loops in sorting),
269 * and a "bogus" string compares less than any non-"bogus" one.
270 *
271 * Const UnicodeString methods are thread-safe. Multiple threads can use
272 * const methods on the same UnicodeString object simultaneously,
273 * but non-const methods must not be called concurrently (in multiple threads)
274 * with any other (const or non-const) methods.
275 *
276 * Similarly, const UnicodeString & parameters are thread-safe.
277 * One object may be passed in as such a parameter concurrently in multiple threads.
278 * This includes the const UnicodeString & parameters for
279 * copy construction, assignment, and cloning.
280 *
281 * UnicodeString uses several storage methods.
282 * String contents can be stored inside the UnicodeString object itself,
283 * in an allocated and shared buffer, or in an outside buffer that is "aliased".
284 * Most of this is done transparently, but careful aliasing in particular provides
285 * significant performance improvements.
286 * Also, the internal buffer is accessible via special functions.
287 * For details see the
288 * [User Guide Strings chapter](http://userguide.icu-project.org/strings#TOC-Maximizing-Performance-with-the-UnicodeString-Storage-Model).
289 *
290 * @see utf.h
291 * @see CharacterIterator
292 * @stable ICU 2.0
293 */
294class U_COMMON_API UnicodeString : public Replaceable
295{
296public:
297
298 /**
299 * Constant to be used in the UnicodeString(char *, int32_t, EInvariant) constructor
300 * which constructs a Unicode string from an invariant-character char * string.
301 * Use the macro US_INV instead of the full qualification for this value.
302 *
303 * @see US_INV
304 * @stable ICU 3.2
305 */
306 enum EInvariant {
307 /**
308 * @see EInvariant
309 * @stable ICU 3.2
310 */
311 kInvariant
312 };
313
314 //========================================
315 // Read-only operations
316 //========================================
317
318 /* Comparison - bitwise only - for international comparison use collation */
319
320 /**
321 * Equality operator. Performs only bitwise comparison.
322 * @param text The UnicodeString to compare to this one.
323 * @return TRUE if `text` contains the same characters as this one,
324 * FALSE otherwise.
325 * @stable ICU 2.0
326 */
327 inline UBool operator== (const UnicodeString& text) const;
328
329 /**
330 * Inequality operator. Performs only bitwise comparison.
331 * @param text The UnicodeString to compare to this one.
332 * @return FALSE if `text` contains the same characters as this one,
333 * TRUE otherwise.
334 * @stable ICU 2.0
335 */
336 inline UBool operator!= (const UnicodeString& text) const;
337
338 /**
339 * Greater than operator. Performs only bitwise comparison.
340 * @param text The UnicodeString to compare to this one.
341 * @return TRUE if the characters in this are bitwise
342 * greater than the characters in `text`, FALSE otherwise
343 * @stable ICU 2.0
344 */
345 inline UBool operator> (const UnicodeString& text) const;
346
347 /**
348 * Less than operator. Performs only bitwise comparison.
349 * @param text The UnicodeString to compare to this one.
350 * @return TRUE if the characters in this are bitwise
351 * less than the characters in `text`, FALSE otherwise
352 * @stable ICU 2.0
353 */
354 inline UBool operator< (const UnicodeString& text) const;
355
356 /**
357 * Greater than or equal operator. Performs only bitwise comparison.
358 * @param text The UnicodeString to compare to this one.
359 * @return TRUE if the characters in this are bitwise
360 * greater than or equal to the characters in `text`, FALSE otherwise
361 * @stable ICU 2.0
362 */
363 inline UBool operator>= (const UnicodeString& text) const;
364
365 /**
366 * Less than or equal operator. Performs only bitwise comparison.
367 * @param text The UnicodeString to compare to this one.
368 * @return TRUE if the characters in this are bitwise
369 * less than or equal to the characters in `text`, FALSE otherwise
370 * @stable ICU 2.0
371 */
372 inline UBool operator<= (const UnicodeString& text) const;
373
374 /**
375 * Compare the characters bitwise in this UnicodeString to
376 * the characters in `text`.
377 * @param text The UnicodeString to compare to this one.
378 * @return The result of bitwise character comparison: 0 if this
379 * contains the same characters as `text`, -1 if the characters in
380 * this are bitwise less than the characters in `text`, +1 if the
381 * characters in this are bitwise greater than the characters
382 * in `text`.
383 * @stable ICU 2.0
384 */
385 inline int8_t compare(const UnicodeString& text) const;
386
387 /**
388 * Compare the characters bitwise in the range
389 * [`start`, `start + length`) with the characters
390 * in the **entire string** `text`.
391 * (The parameters "start" and "length" are not applied to the other text "text".)
392 * @param start the offset at which the compare operation begins
393 * @param length the number of characters of text to compare.
394 * @param text the other text to be compared against this string.
395 * @return The result of bitwise character comparison: 0 if this
396 * contains the same characters as `text`, -1 if the characters in
397 * this are bitwise less than the characters in `text`, +1 if the
398 * characters in this are bitwise greater than the characters
399 * in `text`.
400 * @stable ICU 2.0
401 */
402 inline int8_t compare(int32_t start,
403 int32_t length,
404 const UnicodeString& text) const;
405
406 /**
407 * Compare the characters bitwise in the range
408 * [`start`, `start + length`) with the characters
409 * in `srcText` in the range
410 * [`srcStart`, `srcStart + srcLength`).
411 * @param start the offset at which the compare operation begins
412 * @param length the number of characters in this to compare.
413 * @param srcText the text to be compared
414 * @param srcStart the offset into `srcText` to start comparison
415 * @param srcLength the number of characters in `src` to compare
416 * @return The result of bitwise character comparison: 0 if this
417 * contains the same characters as `srcText`, -1 if the characters in
418 * this are bitwise less than the characters in `srcText`, +1 if the
419 * characters in this are bitwise greater than the characters
420 * in `srcText`.
421 * @stable ICU 2.0
422 */
423 inline int8_t compare(int32_t start,
424 int32_t length,
425 const UnicodeString& srcText,
426 int32_t srcStart,
427 int32_t srcLength) const;
428
429 /**
430 * Compare the characters bitwise in this UnicodeString with the first
431 * `srcLength` characters in `srcChars`.
432 * @param srcChars The characters to compare to this UnicodeString.
433 * @param srcLength the number of characters in `srcChars` to compare
434 * @return The result of bitwise character comparison: 0 if this
435 * contains the same characters as `srcChars`, -1 if the characters in
436 * this are bitwise less than the characters in `srcChars`, +1 if the
437 * characters in this are bitwise greater than the characters
438 * in `srcChars`.
439 * @stable ICU 2.0
440 */
441 inline int8_t compare(ConstChar16Ptr srcChars,
442 int32_t srcLength) const;
443
444 /**
445 * Compare the characters bitwise in the range
446 * [`start`, `start + length`) with the first
447 * `length` characters in `srcChars`
448 * @param start the offset at which the compare operation begins
449 * @param length the number of characters to compare.
450 * @param srcChars the characters to be compared
451 * @return The result of bitwise character comparison: 0 if this
452 * contains the same characters as `srcChars`, -1 if the characters in
453 * this are bitwise less than the characters in `srcChars`, +1 if the
454 * characters in this are bitwise greater than the characters
455 * in `srcChars`.
456 * @stable ICU 2.0
457 */
458 inline int8_t compare(int32_t start,
459 int32_t length,
460 const char16_t *srcChars) const;
461
462 /**
463 * Compare the characters bitwise in the range
464 * [`start`, `start + length`) with the characters
465 * in `srcChars` in the range
466 * [`srcStart`, `srcStart + srcLength`).
467 * @param start the offset at which the compare operation begins
468 * @param length the number of characters in this to compare
469 * @param srcChars the characters to be compared
470 * @param srcStart the offset into `srcChars` to start comparison
471 * @param srcLength the number of characters in `srcChars` to compare
472 * @return The result of bitwise character comparison: 0 if this
473 * contains the same characters as `srcChars`, -1 if the characters in
474 * this are bitwise less than the characters in `srcChars`, +1 if the
475 * characters in this are bitwise greater than the characters
476 * in `srcChars`.
477 * @stable ICU 2.0
478 */
479 inline int8_t compare(int32_t start,
480 int32_t length,
481 const char16_t *srcChars,
482 int32_t srcStart,
483 int32_t srcLength) const;
484
485 /**
486 * Compare the characters bitwise in the range
487 * [`start`, `limit`) with the characters
488 * in `srcText` in the range
489 * [`srcStart`, `srcLimit`).
490 * @param start the offset at which the compare operation begins
491 * @param limit the offset immediately following the compare operation
492 * @param srcText the text to be compared
493 * @param srcStart the offset into `srcText` to start comparison
494 * @param srcLimit the offset into `srcText` to limit comparison
495 * @return The result of bitwise character comparison: 0 if this
496 * contains the same characters as `srcText`, -1 if the characters in
497 * this are bitwise less than the characters in `srcText`, +1 if the
498 * characters in this are bitwise greater than the characters
499 * in `srcText`.
500 * @stable ICU 2.0
501 */
502 inline int8_t compareBetween(int32_t start,
503 int32_t limit,
504 const UnicodeString& srcText,
505 int32_t srcStart,
506 int32_t srcLimit) const;
507
508 /**
509 * Compare two Unicode strings in code point order.
510 * The result may be different from the results of compare(), operator<, etc.
511 * if supplementary characters are present:
512 *
513 * In UTF-16, supplementary characters (with code points U+10000 and above) are
514 * stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff,
515 * which means that they compare as less than some other BMP characters like U+feff.
516 * This function compares Unicode strings in code point order.
517 * If either of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined.
518 *
519 * @param text Another string to compare this one to.
520 * @return a negative/zero/positive integer corresponding to whether
521 * this string is less than/equal to/greater than the second one
522 * in code point order
523 * @stable ICU 2.0
524 */
525 inline int8_t compareCodePointOrder(const UnicodeString& text) const;
526
527 /**
528 * Compare two Unicode strings in code point order.
529 * The result may be different from the results of compare(), operator<, etc.
530 * if supplementary characters are present:
531 *
532 * In UTF-16, supplementary characters (with code points U+10000 and above) are
533 * stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff,
534 * which means that they compare as less than some other BMP characters like U+feff.
535 * This function compares Unicode strings in code point order.
536 * If either of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined.
537 *
538 * @param start The start offset in this string at which the compare operation begins.
539 * @param length The number of code units from this string to compare.
540 * @param srcText Another string to compare this one to.
541 * @return a negative/zero/positive integer corresponding to whether
542 * this string is less than/equal to/greater than the second one
543 * in code point order
544 * @stable ICU 2.0
545 */
546 inline int8_t compareCodePointOrder(int32_t start,
547 int32_t length,
548 const UnicodeString& srcText) const;
549
550 /**
551 * Compare two Unicode strings in code point order.
552 * The result may be different from the results of compare(), operator<, etc.
553 * if supplementary characters are present:
554 *
555 * In UTF-16, supplementary characters (with code points U+10000 and above) are
556 * stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff,
557 * which means that they compare as less than some other BMP characters like U+feff.
558 * This function compares Unicode strings in code point order.
559 * If either of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined.
560 *
561 * @param start The start offset in this string at which the compare operation begins.
562 * @param length The number of code units from this string to compare.
563 * @param srcText Another string to compare this one to.
564 * @param srcStart The start offset in that string at which the compare operation begins.
565 * @param srcLength The number of code units from that string to compare.
566 * @return a negative/zero/positive integer corresponding to whether
567 * this string is less than/equal to/greater than the second one
568 * in code point order
569 * @stable ICU 2.0
570 */
571 inline int8_t compareCodePointOrder(int32_t start,
572 int32_t length,
573 const UnicodeString& srcText,
574 int32_t srcStart,
575 int32_t srcLength) const;
576
577 /**
578 * Compare two Unicode strings in code point order.
579 * The result may be different from the results of compare(), operator<, etc.
580 * if supplementary characters are present:
581 *
582 * In UTF-16, supplementary characters (with code points U+10000 and above) are
583 * stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff,
584 * which means that they compare as less than some other BMP characters like U+feff.
585 * This function compares Unicode strings in code point order.
586 * If either of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined.
587 *
588 * @param srcChars A pointer to another string to compare this one to.
589 * @param srcLength The number of code units from that string to compare.
590 * @return a negative/zero/positive integer corresponding to whether
591 * this string is less than/equal to/greater than the second one
592 * in code point order
593 * @stable ICU 2.0
594 */
595 inline int8_t compareCodePointOrder(ConstChar16Ptr srcChars,
596 int32_t srcLength) const;
597
598 /**
599 * Compare two Unicode strings in code point order.
600 * The result may be different from the results of compare(), operator<, etc.
601 * if supplementary characters are present:
602 *
603 * In UTF-16, supplementary characters (with code points U+10000 and above) are
604 * stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff,
605 * which means that they compare as less than some other BMP characters like U+feff.
606 * This function compares Unicode strings in code point order.
607 * If either of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined.
608 *
609 * @param start The start offset in this string at which the compare operation begins.
610 * @param length The number of code units from this string to compare.
611 * @param srcChars A pointer to another string to compare this one to.
612 * @return a negative/zero/positive integer corresponding to whether
613 * this string is less than/equal to/greater than the second one
614 * in code point order
615 * @stable ICU 2.0
616 */
617 inline int8_t compareCodePointOrder(int32_t start,
618 int32_t length,
619 const char16_t *srcChars) const;
620
621 /**
622 * Compare two Unicode strings in code point order.
623 * The result may be different from the results of compare(), operator<, etc.
624 * if supplementary characters are present:
625 *
626 * In UTF-16, supplementary characters (with code points U+10000 and above) are
627 * stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff,
628 * which means that they compare as less than some other BMP characters like U+feff.
629 * This function compares Unicode strings in code point order.
630 * If either of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined.
631 *
632 * @param start The start offset in this string at which the compare operation begins.
633 * @param length The number of code units from this string to compare.
634 * @param srcChars A pointer to another string to compare this one to.
635 * @param srcStart The start offset in that string at which the compare operation begins.
636 * @param srcLength The number of code units from that string to compare.
637 * @return a negative/zero/positive integer corresponding to whether
638 * this string is less than/equal to/greater than the second one
639 * in code point order
640 * @stable ICU 2.0
641 */
642 inline int8_t compareCodePointOrder(int32_t start,
643 int32_t length,
644 const char16_t *srcChars,
645 int32_t srcStart,
646 int32_t srcLength) const;
647
648 /**
649 * Compare two Unicode strings in code point order.
650 * The result may be different from the results of compare(), operator<, etc.
651 * if supplementary characters are present:
652 *
653 * In UTF-16, supplementary characters (with code points U+10000 and above) are
654 * stored with pairs of surrogate code units. These have values from 0xd800 to 0xdfff,
655 * which means that they compare as less than some other BMP characters like U+feff.
656 * This function compares Unicode strings in code point order.
657 * If either of the UTF-16 strings is malformed (i.e., it contains unpaired surrogates), then the result is not defined.
658 *
659 * @param start The start offset in this string at which the compare operation begins.
660 * @param limit The offset after the last code unit from this string to compare.
661 * @param srcText Another string to compare this one to.
662 * @param srcStart The start offset in that string at which the compare operation begins.
663 * @param srcLimit The offset after the last code unit from that string to compare.
664 * @return a negative/zero/positive integer corresponding to whether
665 * this string is less than/equal to/greater than the second one
666 * in code point order
667 * @stable ICU 2.0
668 */
669 inline int8_t compareCodePointOrderBetween(int32_t start,
670 int32_t limit,
671 const UnicodeString& srcText,
672 int32_t srcStart,
673 int32_t srcLimit) const;
674
675 /**
676 * Compare two strings case-insensitively using full case folding.
677 * This is equivalent to this->foldCase(options).compare(text.foldCase(options)).
678 *
679 * @param text Another string to compare this one to.
680 * @param options A bit set of options:
681 * - U_FOLD_CASE_DEFAULT or 0 is used for default options:
682 * Comparison in code unit order with default case folding.
683 *
684 * - U_COMPARE_CODE_POINT_ORDER
685 * Set to choose code point order instead of code unit order
686 * (see u_strCompare for details).
687 *
688 * - U_FOLD_CASE_EXCLUDE_SPECIAL_I
689 *
690 * @return A negative, zero, or positive integer indicating the comparison result.
691 * @stable ICU 2.0
692 */
693 inline int8_t caseCompare(const UnicodeString& text, uint32_t options) const;
694
695 /**
696 * Compare two strings case-insensitively using full case folding.
697 * This is equivalent to this->foldCase(options).compare(srcText.foldCase(options)).
698 *
699 * @param start The start offset in this string at which the compare operation begins.
700 * @param length The number of code units from this string to compare.
701 * @param srcText Another string to compare this one to.
702 * @param options A bit set of options:
703 * - U_FOLD_CASE_DEFAULT or 0 is used for default options:
704 * Comparison in code unit order with default case folding.
705 *
706 * - U_COMPARE_CODE_POINT_ORDER
707 * Set to choose code point order instead of code unit order
708 * (see u_strCompare for details).
709 *
710 * - U_FOLD_CASE_EXCLUDE_SPECIAL_I
711 *
712 * @return A negative, zero, or positive integer indicating the comparison result.
713 * @stable ICU 2.0
714 */
715 inline int8_t caseCompare(int32_t start,
716 int32_t length,
717 const UnicodeString& srcText,
718 uint32_t options) const;
719
720 /**
721 * Compare two strings case-insensitively using full case folding.
722 * This is equivalent to this->foldCase(options).compare(srcText.foldCase(options)).
723 *
724 * @param start The start offset in this string at which the compare operation begins.
725 * @param length The number of code units from this string to compare.
726 * @param srcText Another string to compare this one to.
727 * @param srcStart The start offset in that string at which the compare operation begins.
728 * @param srcLength The number of code units from that string to compare.
729 * @param options A bit set of options:
730 * - U_FOLD_CASE_DEFAULT or 0 is used for default options:
731 * Comparison in code unit order with default case folding.
732 *
733 * - U_COMPARE_CODE_POINT_ORDER
734 * Set to choose code point order instead of code unit order
735 * (see u_strCompare for details).
736 *
737 * - U_FOLD_CASE_EXCLUDE_SPECIAL_I
738 *
739 * @return A negative, zero, or positive integer indicating the comparison result.
740 * @stable ICU 2.0
741 */
742 inline int8_t caseCompare(int32_t start,
743 int32_t length,
744 const UnicodeString& srcText,
745 int32_t srcStart,
746 int32_t srcLength,
747 uint32_t options) const;
748
749 /**
750 * Compare two strings case-insensitively using full case folding.
751 * This is equivalent to this->foldCase(options).compare(srcChars.foldCase(options)).
752 *
753 * @param srcChars A pointer to another string to compare this one to.
754 * @param srcLength The number of code units from that string to compare.
755 * @param options A bit set of options:
756 * - U_FOLD_CASE_DEFAULT or 0 is used for default options:
757 * Comparison in code unit order with default case folding.
758 *
759 * - U_COMPARE_CODE_POINT_ORDER
760 * Set to choose code point order instead of code unit order
761 * (see u_strCompare for details).
762 *
763 * - U_FOLD_CASE_EXCLUDE_SPECIAL_I
764 *
765 * @return A negative, zero, or positive integer indicating the comparison result.
766 * @stable ICU 2.0
767 */
768 inline int8_t caseCompare(ConstChar16Ptr srcChars,
769 int32_t srcLength,
770 uint32_t options) const;
771
772 /**
773 * Compare two strings case-insensitively using full case folding.
774 * This is equivalent to this->foldCase(options).compare(srcChars.foldCase(options)).
775 *
776 * @param start The start offset in this string at which the compare operation begins.
777 * @param length The number of code units from this string to compare.
778 * @param srcChars A pointer to another string to compare this one to.
779 * @param options A bit set of options:
780 * - U_FOLD_CASE_DEFAULT or 0 is used for default options:
781 * Comparison in code unit order with default case folding.
782 *
783 * - U_COMPARE_CODE_POINT_ORDER
784 * Set to choose code point order instead of code unit order
785 * (see u_strCompare for details).
786 *
787 * - U_FOLD_CASE_EXCLUDE_SPECIAL_I
788 *
789 * @return A negative, zero, or positive integer indicating the comparison result.
790 * @stable ICU 2.0
791 */
792 inline int8_t caseCompare(int32_t start,
793 int32_t length,
794 const char16_t *srcChars,
795 uint32_t options) const;
796
797 /**
798 * Compare two strings case-insensitively using full case folding.
799 * This is equivalent to this->foldCase(options).compare(srcChars.foldCase(options)).
800 *
801 * @param start The start offset in this string at which the compare operation begins.
802 * @param length The number of code units from this string to compare.
803 * @param srcChars A pointer to another string to compare this one to.
804 * @param srcStart The start offset in that string at which the compare operation begins.
805 * @param srcLength The number of code units from that string to compare.
806 * @param options A bit set of options:
807 * - U_FOLD_CASE_DEFAULT or 0 is used for default options:
808 * Comparison in code unit order with default case folding.
809 *
810 * - U_COMPARE_CODE_POINT_ORDER
811 * Set to choose code point order instead of code unit order
812 * (see u_strCompare for details).
813 *
814 * - U_FOLD_CASE_EXCLUDE_SPECIAL_I
815 *
816 * @return A negative, zero, or positive integer indicating the comparison result.
817 * @stable ICU 2.0
818 */
819 inline int8_t caseCompare(int32_t start,
820 int32_t length,
821 const char16_t *srcChars,
822 int32_t srcStart,
823 int32_t srcLength,
824 uint32_t options) const;
825
826 /**
827 * Compare two strings case-insensitively using full case folding.
828 * This is equivalent to this->foldCase(options).compareBetween(text.foldCase(options)).
829 *
830 * @param start The start offset in this string at which the compare operation begins.
831 * @param limit The offset after the last code unit from this string to compare.
832 * @param srcText Another string to compare this one to.
833 * @param srcStart The start offset in that string at which the compare operation begins.
834 * @param srcLimit The offset after the last code unit from that string to compare.
835 * @param options A bit set of options:
836 * - U_FOLD_CASE_DEFAULT or 0 is used for default options:
837 * Comparison in code unit order with default case folding.
838 *
839 * - U_COMPARE_CODE_POINT_ORDER
840 * Set to choose code point order instead of code unit order
841 * (see u_strCompare for details).
842 *
843 * - U_FOLD_CASE_EXCLUDE_SPECIAL_I
844 *
845 * @return A negative, zero, or positive integer indicating the comparison result.
846 * @stable ICU 2.0
847 */
848 inline int8_t caseCompareBetween(int32_t start,
849 int32_t limit,
850 const UnicodeString& srcText,
851 int32_t srcStart,
852 int32_t srcLimit,
853 uint32_t options) const;
854
855 /**
856 * Determine if this starts with the characters in `text`
857 * @param text The text to match.
858 * @return TRUE if this starts with the characters in `text`,
859 * FALSE otherwise
860 * @stable ICU 2.0
861 */
862 inline UBool startsWith(const UnicodeString& text) const;
863
864 /**
865 * Determine if this starts with the characters in `srcText`
866 * in the range [`srcStart`, `srcStart + srcLength`).
867 * @param srcText The text to match.
868 * @param srcStart the offset into `srcText` to start matching
869 * @param srcLength the number of characters in `srcText` to match
870 * @return TRUE if this starts with the characters in `text`,
871 * FALSE otherwise
872 * @stable ICU 2.0
873 */
874 inline UBool startsWith(const UnicodeString& srcText,
875 int32_t srcStart,
876 int32_t srcLength) const;
877
878 /**
879 * Determine if this starts with the characters in `srcChars`
880 * @param srcChars The characters to match.
881 * @param srcLength the number of characters in `srcChars`
882 * @return TRUE if this starts with the characters in `srcChars`,
883 * FALSE otherwise
884 * @stable ICU 2.0
885 */
886 inline UBool startsWith(ConstChar16Ptr srcChars,
887 int32_t srcLength) const;
888
889 /**
890 * Determine if this ends with the characters in `srcChars`
891 * in the range [`srcStart`, `srcStart + srcLength`).
892 * @param srcChars The characters to match.
893 * @param srcStart the offset into `srcText` to start matching
894 * @param srcLength the number of characters in `srcChars` to match
895 * @return TRUE if this ends with the characters in `srcChars`, FALSE otherwise
896 * @stable ICU 2.0
897 */
898 inline UBool startsWith(const char16_t *srcChars,
899 int32_t srcStart,
900 int32_t srcLength) const;
901
902 /**
903 * Determine if this ends with the characters in `text`
904 * @param text The text to match.
905 * @return TRUE if this ends with the characters in `text`,
906 * FALSE otherwise
907 * @stable ICU 2.0
908 */
909 inline UBool endsWith(const UnicodeString& text) const;
910
911 /**
912 * Determine if this ends with the characters in `srcText`
913 * in the range [`srcStart`, `srcStart + srcLength`).
914 * @param srcText The text to match.
915 * @param srcStart the offset into `srcText` to start matching
916 * @param srcLength the number of characters in `srcText` to match
917 * @return TRUE if this ends with the characters in `text`,
918 * FALSE otherwise
919 * @stable ICU 2.0
920 */
921 inline UBool endsWith(const UnicodeString& srcText,
922 int32_t srcStart,
923 int32_t srcLength) const;
924
925 /**
926 * Determine if this ends with the characters in `srcChars`
927 * @param srcChars The characters to match.
928 * @param srcLength the number of characters in `srcChars`
929 * @return TRUE if this ends with the characters in `srcChars`,
930 * FALSE otherwise
931 * @stable ICU 2.0
932 */
933 inline UBool endsWith(ConstChar16Ptr srcChars,
934 int32_t srcLength) const;
935
936 /**
937 * Determine if this ends with the characters in `srcChars`
938 * in the range [`srcStart`, `srcStart + srcLength`).
939 * @param srcChars The characters to match.
940 * @param srcStart the offset into `srcText` to start matching
941 * @param srcLength the number of characters in `srcChars` to match
942 * @return TRUE if this ends with the characters in `srcChars`,
943 * FALSE otherwise
944 * @stable ICU 2.0
945 */
946 inline UBool endsWith(const char16_t *srcChars,
947 int32_t srcStart,
948 int32_t srcLength) const;
949
950
951 /* Searching - bitwise only */
952
953 /**
954 * Locate in this the first occurrence of the characters in `text`,
955 * using bitwise comparison.
956 * @param text The text to search for.
957 * @return The offset into this of the start of `text`,
958 * or -1 if not found.
959 * @stable ICU 2.0
960 */
961 inline int32_t indexOf(const UnicodeString& text) const;
962
963 /**
964 * Locate in this the first occurrence of the characters in `text`
965 * starting at offset `start`, using bitwise comparison.
966 * @param text The text to search for.
967 * @param start The offset at which searching will start.
968 * @return The offset into this of the start of `text`,
969 * or -1 if not found.
970 * @stable ICU 2.0
971 */
972 inline int32_t indexOf(const UnicodeString& text,
973 int32_t start) const;
974
975 /**
976 * Locate in this the first occurrence in the range
977 * [`start`, `start + length`) of the characters
978 * in `text`, using bitwise comparison.
979 * @param text The text to search for.
980 * @param start The offset at which searching will start.
981 * @param length The number of characters to search
982 * @return The offset into this of the start of `text`,
983 * or -1 if not found.
984 * @stable ICU 2.0
985 */
986 inline int32_t indexOf(const UnicodeString& text,
987 int32_t start,
988 int32_t length) const;
989
990 /**
991 * Locate in this the first occurrence in the range
992 * [`start`, `start + length`) of the characters
993 * in `srcText` in the range
994 * [`srcStart`, `srcStart + srcLength`),
995 * using bitwise comparison.
996 * @param srcText The text to search for.
997 * @param srcStart the offset into `srcText` at which
998 * to start matching
999 * @param srcLength the number of characters in `srcText` to match
1000 * @param start the offset into this at which to start matching
1001 * @param length the number of characters in this to search
1002 * @return The offset into this of the start of `text`,
1003 * or -1 if not found.
1004 * @stable ICU 2.0
1005 */
1006 inline int32_t indexOf(const UnicodeString& srcText,
1007 int32_t srcStart,
1008 int32_t srcLength,
1009 int32_t start,
1010 int32_t length) const;
1011
1012 /**
1013 * Locate in this the first occurrence of the characters in
1014 * `srcChars`
1015 * starting at offset `start`, using bitwise comparison.
1016 * @param srcChars The text to search for.
1017 * @param srcLength the number of characters in `srcChars` to match
1018 * @param start the offset into this at which to start matching
1019 * @return The offset into this of the start of `text`,
1020 * or -1 if not found.
1021 * @stable ICU 2.0
1022 */
1023 inline int32_t indexOf(const char16_t *srcChars,
1024 int32_t srcLength,
1025 int32_t start) const;
1026
1027 /**
1028 * Locate in this the first occurrence in the range
1029 * [`start`, `start + length`) of the characters
1030 * in `srcChars`, using bitwise comparison.
1031 * @param srcChars The text to search for.
1032 * @param srcLength the number of characters in `srcChars`
1033 * @param start The offset at which searching will start.
1034 * @param length The number of characters to search
1035 * @return The offset into this of the start of `srcChars`,
1036 * or -1 if not found.
1037 * @stable ICU 2.0
1038 */
1039 inline int32_t indexOf(ConstChar16Ptr srcChars,
1040 int32_t srcLength,
1041 int32_t start,
1042 int32_t length) const;
1043
1044 /**
1045 * Locate in this the first occurrence in the range
1046 * [`start`, `start + length`) of the characters
1047 * in `srcChars` in the range
1048 * [`srcStart`, `srcStart + srcLength`),
1049 * using bitwise comparison.
1050 * @param srcChars The text to search for.
1051 * @param srcStart the offset into `srcChars` at which
1052 * to start matching
1053 * @param srcLength the number of characters in `srcChars` to match
1054 * @param start the offset into this at which to start matching
1055 * @param length the number of characters in this to search
1056 * @return The offset into this of the start of `text`,
1057 * or -1 if not found.
1058 * @stable ICU 2.0
1059 */
1060 int32_t indexOf(const char16_t *srcChars,
1061 int32_t srcStart,
1062 int32_t srcLength,
1063 int32_t start,
1064 int32_t length) const;
1065
1066 /**
1067 * Locate in this the first occurrence of the BMP code point `c`,
1068 * using bitwise comparison.
1069 * @param c The code unit to search for.
1070 * @return The offset into this of `c`, or -1 if not found.
1071 * @stable ICU 2.0
1072 */
1073 inline int32_t indexOf(char16_t c) const;
1074
1075 /**
1076 * Locate in this the first occurrence of the code point `c`,
1077 * using bitwise comparison.
1078 *
1079 * @param c The code point to search for.
1080 * @return The offset into this of `c`, or -1 if not found.
1081 * @stable ICU 2.0
1082 */
1083 inline int32_t indexOf(UChar32 c) const;
1084
1085 /**
1086 * Locate in this the first occurrence of the BMP code point `c`,
1087 * starting at offset `start`, using bitwise comparison.
1088 * @param c The code unit to search for.
1089 * @param start The offset at which searching will start.
1090 * @return The offset into this of `c`, or -1 if not found.
1091 * @stable ICU 2.0
1092 */
1093 inline int32_t indexOf(char16_t c,
1094 int32_t start) const;
1095
1096 /**
1097 * Locate in this the first occurrence of the code point `c`
1098 * starting at offset `start`, using bitwise comparison.
1099 *
1100 * @param c The code point to search for.
1101 * @param start The offset at which searching will start.
1102 * @return The offset into this of `c`, or -1 if not found.
1103 * @stable ICU 2.0
1104 */
1105 inline int32_t indexOf(UChar32 c,
1106 int32_t start) const;
1107
1108 /**
1109 * Locate in this the first occurrence of the BMP code point `c`
1110 * in the range [`start`, `start + length`),
1111 * using bitwise comparison.
1112 * @param c The code unit to search for.
1113 * @param start the offset into this at which to start matching
1114 * @param length the number of characters in this to search
1115 * @return The offset into this of `c`, or -1 if not found.
1116 * @stable ICU 2.0
1117 */
1118 inline int32_t indexOf(char16_t c,
1119 int32_t start,
1120 int32_t length) const;
1121
1122 /**
1123 * Locate in this the first occurrence of the code point `c`
1124 * in the range [`start`, `start + length`),
1125 * using bitwise comparison.
1126 *
1127 * @param c The code point to search for.
1128 * @param start the offset into this at which to start matching
1129 * @param length the number of characters in this to search
1130 * @return The offset into this of `c`, or -1 if not found.
1131 * @stable ICU 2.0
1132 */
1133 inline int32_t indexOf(UChar32 c,
1134 int32_t start,
1135 int32_t length) const;
1136
1137 /**
1138 * Locate in this the last occurrence of the characters in `text`,
1139 * using bitwise comparison.
1140 * @param text The text to search for.
1141 * @return The offset into this of the start of `text`,
1142 * or -1 if not found.
1143 * @stable ICU 2.0
1144 */
1145 inline int32_t lastIndexOf(const UnicodeString& text) const;
1146
1147 /**
1148 * Locate in this the last occurrence of the characters in `text`
1149 * starting at offset `start`, using bitwise comparison.
1150 * @param text The text to search for.
1151 * @param start The offset at which searching will start.
1152 * @return The offset into this of the start of `text`,
1153 * or -1 if not found.
1154 * @stable ICU 2.0
1155 */
1156 inline int32_t lastIndexOf(const UnicodeString& text,
1157 int32_t start) const;
1158
1159 /**
1160 * Locate in this the last occurrence in the range
1161 * [`start`, `start + length`) of the characters
1162 * in `text`, using bitwise comparison.
1163 * @param text The text to search for.
1164 * @param start The offset at which searching will start.
1165 * @param length The number of characters to search
1166 * @return The offset into this of the start of `text`,
1167 * or -1 if not found.
1168 * @stable ICU 2.0
1169 */
1170 inline int32_t lastIndexOf(const UnicodeString& text,
1171 int32_t start,
1172 int32_t length) const;
1173
1174 /**
1175 * Locate in this the last occurrence in the range
1176 * [`start`, `start + length`) of the characters
1177 * in `srcText` in the range
1178 * [`srcStart`, `srcStart + srcLength`),
1179 * using bitwise comparison.
1180 * @param srcText The text to search for.
1181 * @param srcStart the offset into `srcText` at which
1182 * to start matching
1183 * @param srcLength the number of characters in `srcText` to match
1184 * @param start the offset into this at which to start matching
1185 * @param length the number of characters in this to search
1186 * @return The offset into this of the start of `text`,
1187 * or -1 if not found.
1188 * @stable ICU 2.0
1189 */
1190 inline int32_t lastIndexOf(const UnicodeString& srcText,
1191 int32_t srcStart,
1192 int32_t srcLength,
1193 int32_t start,
1194 int32_t length) const;
1195
1196 /**
1197 * Locate in this the last occurrence of the characters in `srcChars`
1198 * starting at offset `start`, using bitwise comparison.
1199 * @param srcChars The text to search for.
1200 * @param srcLength the number of characters in `srcChars` to match
1201 * @param start the offset into this at which to start matching
1202 * @return The offset into this of the start of `text`,
1203 * or -1 if not found.
1204 * @stable ICU 2.0
1205 */
1206 inline int32_t lastIndexOf(const char16_t *srcChars,
1207 int32_t srcLength,
1208 int32_t start) const;
1209
1210 /**
1211 * Locate in this the last occurrence in the range
1212 * [`start`, `start + length`) of the characters
1213 * in `srcChars`, using bitwise comparison.
1214 * @param srcChars The text to search for.
1215 * @param srcLength the number of characters in `srcChars`
1216 * @param start The offset at which searching will start.
1217 * @param length The number of characters to search
1218 * @return The offset into this of the start of `srcChars`,
1219 * or -1 if not found.
1220 * @stable ICU 2.0
1221 */
1222 inline int32_t lastIndexOf(ConstChar16Ptr srcChars,
1223 int32_t srcLength,
1224 int32_t start,
1225 int32_t length) const;
1226
1227 /**
1228 * Locate in this the last occurrence in the range
1229 * [`start`, `start + length`) of the characters
1230 * in `srcChars` in the range
1231 * [`srcStart`, `srcStart + srcLength`),
1232 * using bitwise comparison.
1233 * @param srcChars The text to search for.
1234 * @param srcStart the offset into `srcChars` at which
1235 * to start matching
1236 * @param srcLength the number of characters in `srcChars` to match
1237 * @param start the offset into this at which to start matching
1238 * @param length the number of characters in this to search
1239 * @return The offset into this of the start of `text`,
1240 * or -1 if not found.
1241 * @stable ICU 2.0
1242 */
1243 int32_t lastIndexOf(const char16_t *srcChars,
1244 int32_t srcStart,
1245 int32_t srcLength,
1246 int32_t start,
1247 int32_t length) const;
1248
1249 /**
1250 * Locate in this the last occurrence of the BMP code point `c`,
1251 * using bitwise comparison.
1252 * @param c The code unit to search for.
1253 * @return The offset into this of `c`, or -1 if not found.
1254 * @stable ICU 2.0
1255 */
1256 inline int32_t lastIndexOf(char16_t c) const;
1257
1258 /**
1259 * Locate in this the last occurrence of the code point `c`,
1260 * using bitwise comparison.
1261 *
1262 * @param c The code point to search for.
1263 * @return The offset into this of `c`, or -1 if not found.
1264 * @stable ICU 2.0
1265 */
1266 inline int32_t lastIndexOf(UChar32 c) const;
1267
1268 /**
1269 * Locate in this the last occurrence of the BMP code point `c`
1270 * starting at offset `start`, using bitwise comparison.
1271 * @param c The code unit to search for.
1272 * @param start The offset at which searching will start.
1273 * @return The offset into this of `c`, or -1 if not found.
1274 * @stable ICU 2.0
1275 */
1276 inline int32_t lastIndexOf(char16_t c,
1277 int32_t start) const;
1278
1279 /**
1280 * Locate in this the last occurrence of the code point `c`
1281 * starting at offset `start`, using bitwise comparison.
1282 *
1283 * @param c The code point to search for.
1284 * @param start The offset at which searching will start.
1285 * @return The offset into this of `c`, or -1 if not found.
1286 * @stable ICU 2.0
1287 */
1288 inline int32_t lastIndexOf(UChar32 c,
1289 int32_t start) const;
1290
1291 /**
1292 * Locate in this the last occurrence of the BMP code point `c`
1293 * in the range [`start`, `start + length`),
1294 * using bitwise comparison.
1295 * @param c The code unit to search for.
1296 * @param start the offset into this at which to start matching
1297 * @param length the number of characters in this to search
1298 * @return The offset into this of `c`, or -1 if not found.
1299 * @stable ICU 2.0
1300 */
1301 inline int32_t lastIndexOf(char16_t c,
1302 int32_t start,
1303 int32_t length) const;
1304
1305 /**
1306 * Locate in this the last occurrence of the code point `c`
1307 * in the range [`start`, `start + length`),
1308 * using bitwise comparison.
1309 *
1310 * @param c The code point to search for.
1311 * @param start the offset into this at which to start matching
1312 * @param length the number of characters in this to search
1313 * @return The offset into this of `c`, or -1 if not found.
1314 * @stable ICU 2.0
1315 */
1316 inline int32_t lastIndexOf(UChar32 c,
1317 int32_t start,
1318 int32_t length) const;
1319
1320
1321 /* Character access */
1322
1323 /**
1324 * Return the code unit at offset `offset`.
1325 * If the offset is not valid (0..length()-1) then U+ffff is returned.
1326 * @param offset a valid offset into the text
1327 * @return the code unit at offset `offset`
1328 * or 0xffff if the offset is not valid for this string
1329 * @stable ICU 2.0
1330 */
1331 inline char16_t charAt(int32_t offset) const;
1332
1333 /**
1334 * Return the code unit at offset `offset`.
1335 * If the offset is not valid (0..length()-1) then U+ffff is returned.
1336 * @param offset a valid offset into the text
1337 * @return the code unit at offset `offset`
1338 * @stable ICU 2.0
1339 */
1340 inline char16_t operator[] (int32_t offset) const;
1341
1342 /**
1343 * Return the code point that contains the code unit
1344 * at offset `offset`.
1345 * If the offset is not valid (0..length()-1) then U+ffff is returned.
1346 * @param offset a valid offset into the text
1347 * that indicates the text offset of any of the code units
1348 * that will be assembled into a code point (21-bit value) and returned
1349 * @return the code point of text at `offset`
1350 * or 0xffff if the offset is not valid for this string
1351 * @stable ICU 2.0
1352 */
1353 UChar32 char32At(int32_t offset) const;
1354
1355 /**
1356 * Adjust a random-access offset so that
1357 * it points to the beginning of a Unicode character.
1358 * The offset that is passed in points to
1359 * any code unit of a code point,
1360 * while the returned offset will point to the first code unit
1361 * of the same code point.
1362 * In UTF-16, if the input offset points to a second surrogate
1363 * of a surrogate pair, then the returned offset will point
1364 * to the first surrogate.
1365 * @param offset a valid offset into one code point of the text
1366 * @return offset of the first code unit of the same code point
1367 * @see U16_SET_CP_START
1368 * @stable ICU 2.0
1369 */
1370 int32_t getChar32Start(int32_t offset) const;
1371
1372 /**
1373 * Adjust a random-access offset so that
1374 * it points behind a Unicode character.
1375 * The offset that is passed in points behind
1376 * any code unit of a code point,
1377 * while the returned offset will point behind the last code unit
1378 * of the same code point.
1379 * In UTF-16, if the input offset points behind the first surrogate
1380 * (i.e., to the second surrogate)
1381 * of a surrogate pair, then the returned offset will point
1382 * behind the second surrogate (i.e., to the first surrogate).
1383 * @param offset a valid offset after any code unit of a code point of the text
1384 * @return offset of the first code unit after the same code point
1385 * @see U16_SET_CP_LIMIT
1386 * @stable ICU 2.0
1387 */
1388 int32_t getChar32Limit(int32_t offset) const;
1389
1390 /**
1391 * Move the code unit index along the string by delta code points.
1392 * Interpret the input index as a code unit-based offset into the string,
1393 * move the index forward or backward by delta code points, and
1394 * return the resulting index.
1395 * The input index should point to the first code unit of a code point,
1396 * if there is more than one.
1397 *
1398 * Both input and output indexes are code unit-based as for all
1399 * string indexes/offsets in ICU (and other libraries, like MBCS char*).
1400 * If delta<0 then the index is moved backward (toward the start of the string).
1401 * If delta>0 then the index is moved forward (toward the end of the string).
1402 *
1403 * This behaves like CharacterIterator::move32(delta, kCurrent).
1404 *
1405 * Behavior for out-of-bounds indexes:
1406 * `moveIndex32` pins the input index to 0..length(), i.e.,
1407 * if the input index<0 then it is pinned to 0;
1408 * if it is index>length() then it is pinned to length().
1409 * Afterwards, the index is moved by `delta` code points
1410 * forward or backward,
1411 * but no further backward than to 0 and no further forward than to length().
1412 * The resulting index return value will be in between 0 and length(), inclusively.
1413 *
1414 * Examples:
1415 * \code
1416 * // s has code points 'a' U+10000 'b' U+10ffff U+2029
1417 * UnicodeString s(u"a\U00010000b\U0010ffff\u2029");
1418 *
1419 * // initial index: position of U+10000
1420 * int32_t index=1;
1421 *
1422 * // the following examples will all result in index==4, position of U+10ffff
1423 *
1424 * // skip 2 code points from some position in the string
1425 * index=s.moveIndex32(index, 2); // skips U+10000 and 'b'
1426 *
1427 * // go to the 3rd code point from the start of s (0-based)
1428 * index=s.moveIndex32(0, 3); // skips 'a', U+10000, and 'b'
1429 *
1430 * // go to the next-to-last code point of s
1431 * index=s.moveIndex32(s.length(), -2); // backward-skips U+2029 and U+10ffff
1432 * \endcode
1433 *
1434 * @param index input code unit index
1435 * @param delta (signed) code point count to move the index forward or backward
1436 * in the string
1437 * @return the resulting code unit index
1438 * @stable ICU 2.0
1439 */
1440 int32_t moveIndex32(int32_t index, int32_t delta) const;
1441
1442 /* Substring extraction */
1443
1444 /**
1445 * Copy the characters in the range
1446 * [`start`, `start + length`) into the array `dst`,
1447 * beginning at `dstStart`.
1448 * If the string aliases to `dst` itself as an external buffer,
1449 * then extract() will not copy the contents.
1450 *
1451 * @param start offset of first character which will be copied into the array
1452 * @param length the number of characters to extract
1453 * @param dst array in which to copy characters. The length of `dst`
1454 * must be at least (`dstStart + length`).
1455 * @param dstStart the offset in `dst` where the first character
1456 * will be extracted
1457 * @stable ICU 2.0
1458 */
1459 inline void extract(int32_t start,
1460 int32_t length,
1461 Char16Ptr dst,
1462 int32_t dstStart = 0) const;
1463
1464 /**
1465 * Copy the contents of the string into dest.
1466 * This is a convenience function that
1467 * checks if there is enough space in dest,
1468 * extracts the entire string if possible,
1469 * and NUL-terminates dest if possible.
1470 *
1471 * If the string fits into dest but cannot be NUL-terminated
1472 * (length()==destCapacity) then the error code is set to U_STRING_NOT_TERMINATED_WARNING.
1473 * If the string itself does not fit into dest
1474 * (length()>destCapacity) then the error code is set to U_BUFFER_OVERFLOW_ERROR.
1475 *
1476 * If the string aliases to `dest` itself as an external buffer,
1477 * then extract() will not copy the contents.
1478 *
1479 * @param dest Destination string buffer.
1480 * @param destCapacity Number of char16_ts available at dest.
1481 * @param errorCode ICU error code.
1482 * @return length()
1483 * @stable ICU 2.0
1484 */
1485 int32_t
1486 extract(Char16Ptr dest, int32_t destCapacity,
1487 UErrorCode &errorCode) const;
1488
1489 /**
1490 * Copy the characters in the range
1491 * [`start`, `start + length`) into the UnicodeString
1492 * `target`.
1493 * @param start offset of first character which will be copied
1494 * @param length the number of characters to extract
1495 * @param target UnicodeString into which to copy characters.
1496 * @stable ICU 2.0
1497 */
1498 inline void extract(int32_t start,
1499 int32_t length,
1500 UnicodeString& target) const;
1501
1502 /**
1503 * Copy the characters in the range [`start`, `limit`)
1504 * into the array `dst`, beginning at `dstStart`.
1505 * @param start offset of first character which will be copied into the array
1506 * @param limit offset immediately following the last character to be copied
1507 * @param dst array in which to copy characters. The length of `dst`
1508 * must be at least (`dstStart + (limit - start)`).
1509 * @param dstStart the offset in `dst` where the first character
1510 * will be extracted
1511 * @stable ICU 2.0
1512 */
1513 inline void extractBetween(int32_t start,
1514 int32_t limit,
1515 char16_t *dst,
1516 int32_t dstStart = 0) const;
1517
1518 /**
1519 * Copy the characters in the range [`start`, `limit`)
1520 * into the UnicodeString `target`. Replaceable API.
1521 * @param start offset of first character which will be copied
1522 * @param limit offset immediately following the last character to be copied
1523 * @param target UnicodeString into which to copy characters.
1524 * @stable ICU 2.0
1525 */
1526 virtual void extractBetween(int32_t start,
1527 int32_t limit,
1528 UnicodeString& target) const;
1529
1530 /**
1531 * Copy the characters in the range
1532 * [`start`, `start + startLength`) into an array of characters.
1533 * All characters must be invariant (see utypes.h).
1534 * Use US_INV as the last, signature-distinguishing parameter.
1535 *
1536 * This function does not write any more than `targetCapacity`
1537 * characters but returns the length of the entire output string
1538 * so that one can allocate a larger buffer and call the function again
1539 * if necessary.
1540 * The output string is NUL-terminated if possible.
1541 *
1542 * @param start offset of first character which will be copied
1543 * @param startLength the number of characters to extract
1544 * @param target the target buffer for extraction, can be NULL
1545 * if targetLength is 0
1546 * @param targetCapacity the length of the target buffer
1547 * @param inv Signature-distinguishing paramater, use US_INV.
1548 * @return the output string length, not including the terminating NUL
1549 * @stable ICU 3.2
1550 */
1551 int32_t extract(int32_t start,
1552 int32_t startLength,
1553 char *target,
1554 int32_t targetCapacity,
1555 enum EInvariant inv) const;
1556
1557#if U_CHARSET_IS_UTF8 || !UCONFIG_NO_CONVERSION
1558
1559 /**
1560 * Copy the characters in the range
1561 * [`start`, `start + length`) into an array of characters
1562 * in the platform's default codepage.
1563 * This function does not write any more than `targetLength`
1564 * characters but returns the length of the entire output string
1565 * so that one can allocate a larger buffer and call the function again
1566 * if necessary.
1567 * The output string is NUL-terminated if possible.
1568 *
1569 * @param start offset of first character which will be copied
1570 * @param startLength the number of characters to extract
1571 * @param target the target buffer for extraction
1572 * @param targetLength the length of the target buffer
1573 * If `target` is NULL, then the number of bytes required for
1574 * `target` is returned.
1575 * @return the output string length, not including the terminating NUL
1576 * @stable ICU 2.0
1577 */
1578 int32_t extract(int32_t start,
1579 int32_t startLength,
1580 char *target,
1581 uint32_t targetLength) const;
1582
1583#endif
1584
1585#if !UCONFIG_NO_CONVERSION
1586
1587 /**
1588 * Copy the characters in the range
1589 * [`start`, `start + length`) into an array of characters
1590 * in a specified codepage.
1591 * The output string is NUL-terminated.
1592 *
1593 * Recommendation: For invariant-character strings use
1594 * extract(int32_t start, int32_t length, char *target, int32_t targetCapacity, enum EInvariant inv) const
1595 * because it avoids object code dependencies of UnicodeString on
1596 * the conversion code.
1597 *
1598 * @param start offset of first character which will be copied
1599 * @param startLength the number of characters to extract
1600 * @param target the target buffer for extraction
1601 * @param codepage the desired codepage for the characters. 0 has
1602 * the special meaning of the default codepage
1603 * If `codepage` is an empty string (`""`),
1604 * then a simple conversion is performed on the codepage-invariant
1605 * subset ("invariant characters") of the platform encoding. See utypes.h.
1606 * If `target` is NULL, then the number of bytes required for
1607 * `target` is returned. It is assumed that the target is big enough
1608 * to fit all of the characters.
1609 * @return the output string length, not including the terminating NUL
1610 * @stable ICU 2.0
1611 */
1612 inline int32_t extract(int32_t start,
1613 int32_t startLength,
1614 char *target,
1615 const char *codepage = 0) const;
1616
1617 /**
1618 * Copy the characters in the range
1619 * [`start`, `start + length`) into an array of characters
1620 * in a specified codepage.
1621 * This function does not write any more than `targetLength`
1622 * characters but returns the length of the entire output string
1623 * so that one can allocate a larger buffer and call the function again
1624 * if necessary.
1625 * The output string is NUL-terminated if possible.
1626 *
1627 * Recommendation: For invariant-character strings use
1628 * extract(int32_t start, int32_t length, char *target, int32_t targetCapacity, enum EInvariant inv) const
1629 * because it avoids object code dependencies of UnicodeString on
1630 * the conversion code.
1631 *
1632 * @param start offset of first character which will be copied
1633 * @param startLength the number of characters to extract
1634 * @param target the target buffer for extraction
1635 * @param targetLength the length of the target buffer
1636 * @param codepage the desired codepage for the characters. 0 has
1637 * the special meaning of the default codepage
1638 * If `codepage` is an empty string (`""`),
1639 * then a simple conversion is performed on the codepage-invariant
1640 * subset ("invariant characters") of the platform encoding. See utypes.h.
1641 * If `target` is NULL, then the number of bytes required for
1642 * `target` is returned.
1643 * @return the output string length, not including the terminating NUL
1644 * @stable ICU 2.0
1645 */
1646 int32_t extract(int32_t start,
1647 int32_t startLength,
1648 char *target,
1649 uint32_t targetLength,
1650 const char *codepage) const;
1651
1652 /**
1653 * Convert the UnicodeString into a codepage string using an existing UConverter.
1654 * The output string is NUL-terminated if possible.
1655 *
1656 * This function avoids the overhead of opening and closing a converter if
1657 * multiple strings are extracted.
1658 *
1659 * @param dest destination string buffer, can be NULL if destCapacity==0
1660 * @param destCapacity the number of chars available at dest
1661 * @param cnv the converter object to be used (ucnv_resetFromUnicode() will be called),
1662 * or NULL for the default converter
1663 * @param errorCode normal ICU error code
1664 * @return the length of the output string, not counting the terminating NUL;
1665 * if the length is greater than destCapacity, then the string will not fit
1666 * and a buffer of the indicated length would need to be passed in
1667 * @stable ICU 2.0
1668 */
1669 int32_t extract(char *dest, int32_t destCapacity,
1670 UConverter *cnv,
1671 UErrorCode &errorCode) const;
1672
1673#endif
1674
1675 /**
1676 * Create a temporary substring for the specified range.
1677 * Unlike the substring constructor and setTo() functions,
1678 * the object returned here will be a read-only alias (using getBuffer())
1679 * rather than copying the text.
1680 * As a result, this substring operation is much faster but requires
1681 * that the original string not be modified or deleted during the lifetime
1682 * of the returned substring object.
1683 * @param start offset of the first character visible in the substring
1684 * @param length length of the substring
1685 * @return a read-only alias UnicodeString object for the substring
1686 * @stable ICU 4.4
1687 */
1688 UnicodeString tempSubString(int32_t start=0, int32_t length=INT32_MAX) const;
1689
1690 /**
1691 * Create a temporary substring for the specified range.
1692 * Same as tempSubString(start, length) except that the substring range
1693 * is specified as a (start, limit) pair (with an exclusive limit index)
1694 * rather than a (start, length) pair.
1695 * @param start offset of the first character visible in the substring
1696 * @param limit offset immediately following the last character visible in the substring
1697 * @return a read-only alias UnicodeString object for the substring
1698 * @stable ICU 4.4
1699 */
1700 inline UnicodeString tempSubStringBetween(int32_t start, int32_t limit=INT32_MAX) const;
1701
1702 /**
1703 * Convert the UnicodeString to UTF-8 and write the result
1704 * to a ByteSink. This is called by toUTF8String().
1705 * Unpaired surrogates are replaced with U+FFFD.
1706 * Calls u_strToUTF8WithSub().
1707 *
1708 * @param sink A ByteSink to which the UTF-8 version of the string is written.
1709 * sink.Flush() is called at the end.
1710 * @stable ICU 4.2
1711 * @see toUTF8String
1712 */
1713 void toUTF8(ByteSink &sink) const;
1714
1715 /**
1716 * Convert the UnicodeString to UTF-8 and append the result
1717 * to a standard string.
1718 * Unpaired surrogates are replaced with U+FFFD.
1719 * Calls toUTF8().
1720 *
1721 * @param result A standard string (or a compatible object)
1722 * to which the UTF-8 version of the string is appended.
1723 * @return The string object.
1724 * @stable ICU 4.2
1725 * @see toUTF8
1726 */
1727 template<typename StringClass>
1728 StringClass &toUTF8String(StringClass &result) const {
1729 StringByteSink<StringClass> sbs(&result, length());
1730 toUTF8(sbs);
1731 return result;
1732 }
1733
1734 /**
1735 * Convert the UnicodeString to UTF-32.
1736 * Unpaired surrogates are replaced with U+FFFD.
1737 * Calls u_strToUTF32WithSub().
1738 *
1739 * @param utf32 destination string buffer, can be NULL if capacity==0
1740 * @param capacity the number of UChar32s available at utf32
1741 * @param errorCode Standard ICU error code. Its input value must
1742 * pass the U_SUCCESS() test, or else the function returns
1743 * immediately. Check for U_FAILURE() on output or use with
1744 * function chaining. (See User Guide for details.)
1745 * @return The length of the UTF-32 string.
1746 * @see fromUTF32
1747 * @stable ICU 4.2
1748 */
1749 int32_t toUTF32(UChar32 *utf32, int32_t capacity, UErrorCode &errorCode) const;
1750
1751 /* Length operations */
1752
1753 /**
1754 * Return the length of the UnicodeString object.
1755 * The length is the number of char16_t code units are in the UnicodeString.
1756 * If you want the number of code points, please use countChar32().
1757 * @return the length of the UnicodeString object
1758 * @see countChar32
1759 * @stable ICU 2.0
1760 */
1761 inline int32_t length(void) const;
1762
1763 /**
1764 * Count Unicode code points in the length char16_t code units of the string.
1765 * A code point may occupy either one or two char16_t code units.
1766 * Counting code points involves reading all code units.
1767 *
1768 * This functions is basically the inverse of moveIndex32().
1769 *
1770 * @param start the index of the first code unit to check
1771 * @param length the number of char16_t code units to check
1772 * @return the number of code points in the specified code units
1773 * @see length
1774 * @stable ICU 2.0
1775 */
1776 int32_t
1777 countChar32(int32_t start=0, int32_t length=INT32_MAX) const;
1778
1779 /**
1780 * Check if the length char16_t code units of the string
1781 * contain more Unicode code points than a certain number.
1782 * This is more efficient than counting all code points in this part of the string
1783 * and comparing that number with a threshold.
1784 * This function may not need to scan the string at all if the length
1785 * falls within a certain range, and
1786 * never needs to count more than 'number+1' code points.
1787 * Logically equivalent to (countChar32(start, length)>number).
1788 * A Unicode code point may occupy either one or two char16_t code units.
1789 *
1790 * @param start the index of the first code unit to check (0 for the entire string)
1791 * @param length the number of char16_t code units to check
1792 * (use INT32_MAX for the entire string; remember that start/length
1793 * values are pinned)
1794 * @param number The number of code points in the (sub)string is compared against
1795 * the 'number' parameter.
1796 * @return Boolean value for whether the string contains more Unicode code points
1797 * than 'number'. Same as (u_countChar32(s, length)>number).
1798 * @see countChar32
1799 * @see u_strHasMoreChar32Than
1800 * @stable ICU 2.4
1801 */
1802 UBool
1803 hasMoreChar32Than(int32_t start, int32_t length, int32_t number) const;
1804
1805 /**
1806 * Determine if this string is empty.
1807 * @return TRUE if this string contains 0 characters, FALSE otherwise.
1808 * @stable ICU 2.0
1809 */
1810 inline UBool isEmpty(void) const;
1811
1812 /**
1813 * Return the capacity of the internal buffer of the UnicodeString object.
1814 * This is useful together with the getBuffer functions.
1815 * See there for details.
1816 *
1817 * @return the number of char16_ts available in the internal buffer
1818 * @see getBuffer
1819 * @stable ICU 2.0
1820 */
1821 inline int32_t getCapacity(void) const;
1822
1823 /* Other operations */
1824
1825 /**
1826 * Generate a hash code for this object.
1827 * @return The hash code of this UnicodeString.
1828 * @stable ICU 2.0
1829 */
1830 inline int32_t hashCode(void) const;
1831
1832 /**
1833 * Determine if this object contains a valid string.
1834 * A bogus string has no value. It is different from an empty string,
1835 * although in both cases isEmpty() returns TRUE and length() returns 0.
1836 * setToBogus() and isBogus() can be used to indicate that no string value is available.
1837 * For a bogus string, getBuffer() and getTerminatedBuffer() return NULL, and
1838 * length() returns 0.
1839 *
1840 * @return TRUE if the string is bogus/invalid, FALSE otherwise
1841 * @see setToBogus()
1842 * @stable ICU 2.0
1843 */
1844 inline UBool isBogus(void) const;
1845
1846
1847 //========================================
1848 // Write operations
1849 //========================================
1850
1851 /* Assignment operations */
1852
1853 /**
1854 * Assignment operator. Replace the characters in this UnicodeString
1855 * with the characters from `srcText`.
1856 *
1857 * Starting with ICU 2.4, the assignment operator and the copy constructor
1858 * allocate a new buffer and copy the buffer contents even for readonly aliases.
1859 * By contrast, the fastCopyFrom() function implements the old,
1860 * more efficient but less safe behavior
1861 * of making this string also a readonly alias to the same buffer.
1862 *
1863 * If the source object has an "open" buffer from getBuffer(minCapacity),
1864 * then the copy is an empty string.
1865 *
1866 * @param srcText The text containing the characters to replace
1867 * @return a reference to this
1868 * @stable ICU 2.0
1869 * @see fastCopyFrom
1870 */
1871 UnicodeString &operator=(const UnicodeString &srcText);
1872
1873 /**
1874 * Almost the same as the assignment operator.
1875 * Replace the characters in this UnicodeString
1876 * with the characters from `srcText`.
1877 *
1878 * This function works the same as the assignment operator
1879 * for all strings except for ones that are readonly aliases.
1880 *
1881 * Starting with ICU 2.4, the assignment operator and the copy constructor
1882 * allocate a new buffer and copy the buffer contents even for readonly aliases.
1883 * This function implements the old, more efficient but less safe behavior
1884 * of making this string also a readonly alias to the same buffer.
1885 *
1886 * The fastCopyFrom function must be used only if it is known that the lifetime of
1887 * this UnicodeString does not exceed the lifetime of the aliased buffer
1888 * including its contents, for example for strings from resource bundles
1889 * or aliases to string constants.
1890 *
1891 * If the source object has an "open" buffer from getBuffer(minCapacity),
1892 * then the copy is an empty string.
1893 *
1894 * @param src The text containing the characters to replace.
1895 * @return a reference to this
1896 * @stable ICU 2.4
1897 */
1898 UnicodeString &fastCopyFrom(const UnicodeString &src);
1899
1900 /**
1901 * Move assignment operator; might leave src in bogus state.
1902 * This string will have the same contents and state that the source string had.
1903 * The behavior is undefined if *this and src are the same object.
1904 * @param src source string
1905 * @return *this
1906 * @stable ICU 56
1907 */
1908 UnicodeString &operator=(UnicodeString &&src) U_NOEXCEPT;
1909
1910 /**
1911 * Swap strings.
1912 * @param other other string
1913 * @stable ICU 56
1914 */
1915 void swap(UnicodeString &other) U_NOEXCEPT;
1916
1917 /**
1918 * Non-member UnicodeString swap function.
1919 * @param s1 will get s2's contents and state
1920 * @param s2 will get s1's contents and state
1921 * @stable ICU 56
1922 */
1923 friend inline void U_EXPORT2
1924 swap(UnicodeString &s1, UnicodeString &s2) U_NOEXCEPT {
1925 s1.swap(s2);
1926 }
1927
1928 /**
1929 * Assignment operator. Replace the characters in this UnicodeString
1930 * with the code unit `ch`.
1931 * @param ch the code unit to replace
1932 * @return a reference to this
1933 * @stable ICU 2.0
1934 */
1935 inline UnicodeString& operator= (char16_t ch);
1936
1937 /**
1938 * Assignment operator. Replace the characters in this UnicodeString
1939 * with the code point `ch`.
1940 * @param ch the code point to replace
1941 * @return a reference to this
1942 * @stable ICU 2.0
1943 */
1944 inline UnicodeString& operator= (UChar32 ch);
1945
1946 /**
1947 * Set the text in the UnicodeString object to the characters
1948 * in `srcText` in the range
1949 * [`srcStart`, `srcText.length()`).
1950 * `srcText` is not modified.
1951 * @param srcText the source for the new characters
1952 * @param srcStart the offset into `srcText` where new characters
1953 * will be obtained
1954 * @return a reference to this
1955 * @stable ICU 2.2
1956 */
1957 inline UnicodeString& setTo(const UnicodeString& srcText,
1958 int32_t srcStart);
1959
1960 /**
1961 * Set the text in the UnicodeString object to the characters
1962 * in `srcText` in the range
1963 * [`srcStart`, `srcStart + srcLength`).
1964 * `srcText` is not modified.
1965 * @param srcText the source for the new characters
1966 * @param srcStart the offset into `srcText` where new characters
1967 * will be obtained
1968 * @param srcLength the number of characters in `srcText` in the
1969 * replace string.
1970 * @return a reference to this
1971 * @stable ICU 2.0
1972 */
1973 inline UnicodeString& setTo(const UnicodeString& srcText,
1974 int32_t srcStart,
1975 int32_t srcLength);
1976
1977 /**
1978 * Set the text in the UnicodeString object to the characters in
1979 * `srcText`.
1980 * `srcText` is not modified.
1981 * @param srcText the source for the new characters
1982 * @return a reference to this
1983 * @stable ICU 2.0
1984 */
1985 inline UnicodeString& setTo(const UnicodeString& srcText);
1986
1987 /**
1988 * Set the characters in the UnicodeString object to the characters
1989 * in `srcChars`. `srcChars` is not modified.
1990 * @param srcChars the source for the new characters
1991 * @param srcLength the number of Unicode characters in srcChars.
1992 * @return a reference to this
1993 * @stable ICU 2.0
1994 */
1995 inline UnicodeString& setTo(const char16_t *srcChars,
1996 int32_t srcLength);
1997
1998 /**
1999 * Set the characters in the UnicodeString object to the code unit
2000 * `srcChar`.
2001 * @param srcChar the code unit which becomes the UnicodeString's character
2002 * content
2003 * @return a reference to this
2004 * @stable ICU 2.0
2005 */
2006 inline UnicodeString& setTo(char16_t srcChar);
2007
2008 /**
2009 * Set the characters in the UnicodeString object to the code point
2010 * `srcChar`.
2011 * @param srcChar the code point which becomes the UnicodeString's character
2012 * content
2013 * @return a reference to this
2014 * @stable ICU 2.0
2015 */
2016 inline UnicodeString& setTo(UChar32 srcChar);
2017
2018 /**
2019 * Aliasing setTo() function, analogous to the readonly-aliasing char16_t* constructor.
2020 * The text will be used for the UnicodeString object, but
2021 * it will not be released when the UnicodeString is destroyed.
2022 * This has copy-on-write semantics:
2023 * When the string is modified, then the buffer is first copied into
2024 * newly allocated memory.
2025 * The aliased buffer is never modified.
2026 *
2027 * In an assignment to another UnicodeString, when using the copy constructor
2028 * or the assignment operator, the text will be copied.
2029 * When using fastCopyFrom(), the text will be aliased again,
2030 * so that both strings then alias the same readonly-text.
2031 *
2032 * @param isTerminated specifies if `text` is `NUL`-terminated.
2033 * This must be true if `textLength==-1`.
2034 * @param text The characters to alias for the UnicodeString.
2035 * @param textLength The number of Unicode characters in `text` to alias.
2036 * If -1, then this constructor will determine the length
2037 * by calling `u_strlen()`.
2038 * @return a reference to this
2039 * @stable ICU 2.0
2040 */
2041 UnicodeString &setTo(UBool isTerminated,
2042 ConstChar16Ptr text,
2043 int32_t textLength);
2044
2045 /**
2046 * Aliasing setTo() function, analogous to the writable-aliasing char16_t* constructor.
2047 * The text will be used for the UnicodeString object, but
2048 * it will not be released when the UnicodeString is destroyed.
2049 * This has write-through semantics:
2050 * For as long as the capacity of the buffer is sufficient, write operations
2051 * will directly affect the buffer. When more capacity is necessary, then
2052 * a new buffer will be allocated and the contents copied as with regularly
2053 * constructed strings.
2054 * In an assignment to another UnicodeString, the buffer will be copied.
2055 * The extract(Char16Ptr dst) function detects whether the dst pointer is the same
2056 * as the string buffer itself and will in this case not copy the contents.
2057 *
2058 * @param buffer The characters to alias for the UnicodeString.
2059 * @param buffLength The number of Unicode characters in `buffer` to alias.
2060 * @param buffCapacity The size of `buffer` in char16_ts.
2061 * @return a reference to this
2062 * @stable ICU 2.0
2063 */
2064 UnicodeString &setTo(char16_t *buffer,
2065 int32_t buffLength,
2066 int32_t buffCapacity);
2067
2068 /**
2069 * Make this UnicodeString object invalid.
2070 * The string will test TRUE with isBogus().
2071 *
2072 * A bogus string has no value. It is different from an empty string.
2073 * It can be used to indicate that no string value is available.
2074 * getBuffer() and getTerminatedBuffer() return NULL, and
2075 * length() returns 0.
2076 *
2077 * This utility function is used throughout the UnicodeString
2078 * implementation to indicate that a UnicodeString operation failed,
2079 * and may be used in other functions,
2080 * especially but not exclusively when such functions do not
2081 * take a UErrorCode for simplicity.
2082 *
2083 * The following methods, and no others, will clear a string object's bogus flag:
2084 * - remove()
2085 * - remove(0, INT32_MAX)
2086 * - truncate(0)
2087 * - operator=() (assignment operator)
2088 * - setTo(...)
2089 *
2090 * The simplest ways to turn a bogus string into an empty one
2091 * is to use the remove() function.
2092 * Examples for other functions that are equivalent to "set to empty string":
2093 * \code
2094 * if(s.isBogus()) {
2095 * s.remove(); // set to an empty string (remove all), or
2096 * s.remove(0, INT32_MAX); // set to an empty string (remove all), or
2097 * s.truncate(0); // set to an empty string (complete truncation), or
2098 * s=UnicodeString(); // assign an empty string, or
2099 * s.setTo((UChar32)-1); // set to a pseudo code point that is out of range, or
2100 * s.setTo(u"", 0); // set to an empty C Unicode string
2101 * }
2102 * \endcode
2103 *
2104 * @see isBogus()
2105 * @stable ICU 2.0
2106 */
2107 void setToBogus();
2108
2109 /**
2110 * Set the character at the specified offset to the specified character.
2111 * @param offset A valid offset into the text of the character to set
2112 * @param ch The new character
2113 * @return A reference to this
2114 * @stable ICU 2.0
2115 */
2116 UnicodeString& setCharAt(int32_t offset,
2117 char16_t ch);
2118
2119
2120 /* Append operations */
2121
2122 /**
2123 * Append operator. Append the code unit `ch` to the UnicodeString
2124 * object.
2125 * @param ch the code unit to be appended
2126 * @return a reference to this
2127 * @stable ICU 2.0
2128 */
2129 inline UnicodeString& operator+= (char16_t ch);
2130
2131 /**
2132 * Append operator. Append the code point `ch` to the UnicodeString
2133 * object.
2134 * @param ch the code point to be appended
2135 * @return a reference to this
2136 * @stable ICU 2.0
2137 */
2138 inline UnicodeString& operator+= (UChar32 ch);
2139
2140 /**
2141 * Append operator. Append the characters in `srcText` to the
2142 * UnicodeString object. `srcText` is not modified.
2143 * @param srcText the source for the new characters
2144 * @return a reference to this
2145 * @stable ICU 2.0
2146 */
2147 inline UnicodeString& operator+= (const UnicodeString& srcText);
2148
2149 /**
2150 * Append the characters
2151 * in `srcText` in the range
2152 * [`srcStart`, `srcStart + srcLength`) to the
2153 * UnicodeString object at offset `start`. `srcText`
2154 * is not modified.
2155 * @param srcText the source for the new characters
2156 * @param srcStart the offset into `srcText` where new characters
2157 * will be obtained
2158 * @param srcLength the number of characters in `srcText` in
2159 * the append string
2160 * @return a reference to this
2161 * @stable ICU 2.0
2162 */
2163 inline UnicodeString& append(const UnicodeString& srcText,
2164 int32_t srcStart,
2165 int32_t srcLength);
2166
2167 /**
2168 * Append the characters in `srcText` to the UnicodeString object.
2169 * `srcText` is not modified.
2170 * @param srcText the source for the new characters
2171 * @return a reference to this
2172 * @stable ICU 2.0
2173 */
2174 inline UnicodeString& append(const UnicodeString& srcText);
2175
2176 /**
2177 * Append the characters in `srcChars` in the range
2178 * [`srcStart`, `srcStart + srcLength`) to the UnicodeString
2179 * object at offset
2180 * `start`. `srcChars` is not modified.
2181 * @param srcChars the source for the new characters
2182 * @param srcStart the offset into `srcChars` where new characters
2183 * will be obtained
2184 * @param srcLength the number of characters in `srcChars` in
2185 * the append string; can be -1 if `srcChars` is NUL-terminated
2186 * @return a reference to this
2187 * @stable ICU 2.0
2188 */
2189 inline UnicodeString& append(const char16_t *srcChars,
2190 int32_t srcStart,
2191 int32_t srcLength);
2192
2193 /**
2194 * Append the characters in `srcChars` to the UnicodeString object
2195 * at offset `start`. `srcChars` is not modified.
2196 * @param srcChars the source for the new characters
2197 * @param srcLength the number of Unicode characters in `srcChars`;
2198 * can be -1 if `srcChars` is NUL-terminated
2199 * @return a reference to this
2200 * @stable ICU 2.0
2201 */
2202 inline UnicodeString& append(ConstChar16Ptr srcChars,
2203 int32_t srcLength);
2204
2205 /**
2206 * Append the code unit `srcChar` to the UnicodeString object.
2207 * @param srcChar the code unit to append
2208 * @return a reference to this
2209 * @stable ICU 2.0
2210 */
2211 inline UnicodeString& append(char16_t srcChar);
2212
2213 /**
2214 * Append the code point `srcChar` to the UnicodeString object.
2215 * @param srcChar the code point to append
2216 * @return a reference to this
2217 * @stable ICU 2.0
2218 */
2219 UnicodeString& append(UChar32 srcChar);
2220
2221
2222 /* Insert operations */
2223
2224 /**
2225 * Insert the characters in `srcText` in the range
2226 * [`srcStart`, `srcStart + srcLength`) into the UnicodeString
2227 * object at offset `start`. `srcText` is not modified.
2228 * @param start the offset where the insertion begins
2229 * @param srcText the source for the new characters
2230 * @param srcStart the offset into `srcText` where new characters
2231 * will be obtained
2232 * @param srcLength the number of characters in `srcText` in
2233 * the insert string
2234 * @return a reference to this
2235 * @stable ICU 2.0
2236 */
2237 inline UnicodeString& insert(int32_t start,
2238 const UnicodeString& srcText,
2239 int32_t srcStart,
2240 int32_t srcLength);
2241
2242 /**
2243 * Insert the characters in `srcText` into the UnicodeString object
2244 * at offset `start`. `srcText` is not modified.
2245 * @param start the offset where the insertion begins
2246 * @param srcText the source for the new characters
2247 * @return a reference to this
2248 * @stable ICU 2.0
2249 */
2250 inline UnicodeString& insert(int32_t start,
2251 const UnicodeString& srcText);
2252
2253 /**
2254 * Insert the characters in `srcChars` in the range
2255 * [`srcStart`, `srcStart + srcLength`) into the UnicodeString
2256 * object at offset `start`. `srcChars` is not modified.
2257 * @param start the offset at which the insertion begins
2258 * @param srcChars the source for the new characters
2259 * @param srcStart the offset into `srcChars` where new characters
2260 * will be obtained
2261 * @param srcLength the number of characters in `srcChars`
2262 * in the insert string
2263 * @return a reference to this
2264 * @stable ICU 2.0
2265 */
2266 inline UnicodeString& insert(int32_t start,
2267 const char16_t *srcChars,
2268 int32_t srcStart,
2269 int32_t srcLength);
2270
2271 /**
2272 * Insert the characters in `srcChars` into the UnicodeString object
2273 * at offset `start`. `srcChars` is not modified.
2274 * @param start the offset where the insertion begins
2275 * @param srcChars the source for the new characters
2276 * @param srcLength the number of Unicode characters in srcChars.
2277 * @return a reference to this
2278 * @stable ICU 2.0
2279 */
2280 inline UnicodeString& insert(int32_t start,
2281 ConstChar16Ptr srcChars,
2282 int32_t srcLength);
2283
2284 /**
2285 * Insert the code unit `srcChar` into the UnicodeString object at
2286 * offset `start`.
2287 * @param start the offset at which the insertion occurs
2288 * @param srcChar the code unit to insert
2289 * @return a reference to this
2290 * @stable ICU 2.0
2291 */
2292 inline UnicodeString& insert(int32_t start,
2293 char16_t srcChar);
2294
2295 /**
2296 * Insert the code point `srcChar` into the UnicodeString object at
2297 * offset `start`.
2298 * @param start the offset at which the insertion occurs
2299 * @param srcChar the code point to insert
2300 * @return a reference to this
2301 * @stable ICU 2.0
2302 */
2303 inline UnicodeString& insert(int32_t start,
2304 UChar32 srcChar);
2305
2306
2307 /* Replace operations */
2308
2309 /**
2310 * Replace the characters in the range
2311 * [`start`, `start + length`) with the characters in
2312 * `srcText` in the range
2313 * [`srcStart`, `srcStart + srcLength`).
2314 * `srcText` is not modified.
2315 * @param start the offset at which the replace operation begins
2316 * @param length the number of characters to replace. The character at
2317 * `start + length` is not modified.
2318 * @param srcText the source for the new characters
2319 * @param srcStart the offset into `srcText` where new characters
2320 * will be obtained
2321 * @param srcLength the number of characters in `srcText` in
2322 * the replace string
2323 * @return a reference to this
2324 * @stable ICU 2.0
2325 */
2326 inline UnicodeString& replace(int32_t start,
2327 int32_t length,
2328 const UnicodeString& srcText,
2329 int32_t srcStart,
2330 int32_t srcLength);
2331
2332 /**
2333 * Replace the characters in the range
2334 * [`start`, `start + length`)
2335 * with the characters in `srcText`. `srcText` is
2336 * not modified.
2337 * @param start the offset at which the replace operation begins
2338 * @param length the number of characters to replace. The character at
2339 * `start + length` is not modified.
2340 * @param srcText the source for the new characters
2341 * @return a reference to this
2342 * @stable ICU 2.0
2343 */
2344 inline UnicodeString& replace(int32_t start,
2345 int32_t length,
2346 const UnicodeString& srcText);
2347
2348 /**
2349 * Replace the characters in the range
2350 * [`start`, `start + length`) with the characters in
2351 * `srcChars` in the range
2352 * [`srcStart`, `srcStart + srcLength`). `srcChars`
2353 * is not modified.
2354 * @param start the offset at which the replace operation begins
2355 * @param length the number of characters to replace. The character at
2356 * `start + length` is not modified.
2357 * @param srcChars the source for the new characters
2358 * @param srcStart the offset into `srcChars` where new characters
2359 * will be obtained
2360 * @param srcLength the number of characters in `srcChars`
2361 * in the replace string
2362 * @return a reference to this
2363 * @stable ICU 2.0
2364 */
2365 inline UnicodeString& replace(int32_t start,
2366 int32_t length,
2367 const char16_t *srcChars,
2368 int32_t srcStart,
2369 int32_t srcLength);
2370
2371 /**
2372 * Replace the characters in the range
2373 * [`start`, `start + length`) with the characters in
2374 * `srcChars`. `srcChars` is not modified.
2375 * @param start the offset at which the replace operation begins
2376 * @param length number of characters to replace. The character at
2377 * `start + length` is not modified.
2378 * @param srcChars the source for the new characters
2379 * @param srcLength the number of Unicode characters in srcChars
2380 * @return a reference to this
2381 * @stable ICU 2.0
2382 */
2383 inline UnicodeString& replace(int32_t start,
2384 int32_t length,
2385 ConstChar16Ptr srcChars,
2386 int32_t srcLength);
2387
2388 /**
2389 * Replace the characters in the range
2390 * [`start`, `start + length`) with the code unit
2391 * `srcChar`.
2392 * @param start the offset at which the replace operation begins
2393 * @param length the number of characters to replace. The character at
2394 * `start + length` is not modified.
2395 * @param srcChar the new code unit
2396 * @return a reference to this
2397 * @stable ICU 2.0
2398 */
2399 inline UnicodeString& replace(int32_t start,
2400 int32_t length,
2401 char16_t srcChar);
2402
2403 /**
2404 * Replace the characters in the range
2405 * [`start`, `start + length`) with the code point
2406 * `srcChar`.
2407 * @param start the offset at which the replace operation begins
2408 * @param length the number of characters to replace. The character at
2409 * `start + length` is not modified.
2410 * @param srcChar the new code point
2411 * @return a reference to this
2412 * @stable ICU 2.0
2413 */
2414 UnicodeString& replace(int32_t start, int32_t length, UChar32 srcChar);
2415
2416 /**
2417 * Replace the characters in the range [`start`, `limit`)
2418 * with the characters in `srcText`. `srcText` is not modified.
2419 * @param start the offset at which the replace operation begins
2420 * @param limit the offset immediately following the replace range
2421 * @param srcText the source for the new characters
2422 * @return a reference to this
2423 * @stable ICU 2.0
2424 */
2425 inline UnicodeString& replaceBetween(int32_t start,
2426 int32_t limit,
2427 const UnicodeString& srcText);
2428
2429 /**
2430 * Replace the characters in the range [`start`, `limit`)
2431 * with the characters in `srcText` in the range
2432 * [`srcStart`, `srcLimit`). `srcText` is not modified.
2433 * @param start the offset at which the replace operation begins
2434 * @param limit the offset immediately following the replace range
2435 * @param srcText the source for the new characters
2436 * @param srcStart the offset into `srcChars` where new characters
2437 * will be obtained
2438 * @param srcLimit the offset immediately following the range to copy
2439 * in `srcText`
2440 * @return a reference to this
2441 * @stable ICU 2.0
2442 */
2443 inline UnicodeString& replaceBetween(int32_t start,
2444 int32_t limit,
2445 const UnicodeString& srcText,
2446 int32_t srcStart,
2447 int32_t srcLimit);
2448
2449 /**
2450 * Replace a substring of this object with the given text.
2451 * @param start the beginning index, inclusive; `0 <= start <= limit`.
2452 * @param limit the ending index, exclusive; `start <= limit <= length()`.
2453 * @param text the text to replace characters `start` to `limit - 1`
2454 * @stable ICU 2.0
2455 */
2456 virtual void handleReplaceBetween(int32_t start,
2457 int32_t limit,
2458 const UnicodeString& text);
2459
2460 /**
2461 * Replaceable API
2462 * @return TRUE if it has MetaData
2463 * @stable ICU 2.4
2464 */
2465 virtual UBool hasMetaData() const;
2466
2467 /**
2468 * Copy a substring of this object, retaining attribute (out-of-band)
2469 * information. This method is used to duplicate or reorder substrings.
2470 * The destination index must not overlap the source range.
2471 *
2472 * @param start the beginning index, inclusive; `0 <= start <= limit`.
2473 * @param limit the ending index, exclusive; `start <= limit <= length()`.
2474 * @param dest the destination index. The characters from
2475 * `start..limit-1` will be copied to `dest`.
2476 * Implementations of this method may assume that `dest <= start ||
2477 * dest >= limit`.
2478 * @stable ICU 2.0
2479 */
2480 virtual void copy(int32_t start, int32_t limit, int32_t dest);
2481
2482 /* Search and replace operations */
2483
2484 /**
2485 * Replace all occurrences of characters in oldText with the characters
2486 * in newText
2487 * @param oldText the text containing the search text
2488 * @param newText the text containing the replacement text
2489 * @return a reference to this
2490 * @stable ICU 2.0
2491 */
2492 inline UnicodeString& findAndReplace(const UnicodeString& oldText,
2493 const UnicodeString& newText);
2494
2495 /**
2496 * Replace all occurrences of characters in oldText with characters
2497 * in newText
2498 * in the range [`start`, `start + length`).
2499 * @param start the start of the range in which replace will performed
2500 * @param length the length of the range in which replace will be performed
2501 * @param oldText the text containing the search text
2502 * @param newText the text containing the replacement text
2503 * @return a reference to this
2504 * @stable ICU 2.0
2505 */
2506 inline UnicodeString& findAndReplace(int32_t start,
2507 int32_t length,
2508 const UnicodeString& oldText,
2509 const UnicodeString& newText);
2510
2511 /**
2512 * Replace all occurrences of characters in oldText in the range
2513 * [`oldStart`, `oldStart + oldLength`) with the characters
2514 * in newText in the range
2515 * [`newStart`, `newStart + newLength`)
2516 * in the range [`start`, `start + length`).
2517 * @param start the start of the range in which replace will performed
2518 * @param length the length of the range in which replace will be performed
2519 * @param oldText the text containing the search text
2520 * @param oldStart the start of the search range in `oldText`
2521 * @param oldLength the length of the search range in `oldText`
2522 * @param newText the text containing the replacement text
2523 * @param newStart the start of the replacement range in `newText`
2524 * @param newLength the length of the replacement range in `newText`
2525 * @return a reference to this
2526 * @stable ICU 2.0
2527 */
2528 UnicodeString& findAndReplace(int32_t start,
2529 int32_t length,
2530 const UnicodeString& oldText,
2531 int32_t oldStart,
2532 int32_t oldLength,
2533 const UnicodeString& newText,
2534 int32_t newStart,
2535 int32_t newLength);
2536
2537
2538 /* Remove operations */
2539
2540 /**
2541 * Removes all characters from the UnicodeString object and clears the bogus flag.
2542 * This is the UnicodeString equivalent of std::string’s clear().
2543 *
2544 * @return a reference to this
2545 * @see setToBogus
2546 * @stable ICU 2.0
2547 */
2548 inline UnicodeString& remove();
2549
2550 /**
2551 * Remove the characters in the range
2552 * [`start`, `start + length`) from the UnicodeString object.
2553 * @param start the offset of the first character to remove
2554 * @param length the number of characters to remove
2555 * @return a reference to this
2556 * @stable ICU 2.0
2557 */
2558 inline UnicodeString& remove(int32_t start,
2559 int32_t length = (int32_t)INT32_MAX);
2560
2561 /**
2562 * Remove the characters in the range
2563 * [`start`, `limit`) from the UnicodeString object.
2564 * @param start the offset of the first character to remove
2565 * @param limit the offset immediately following the range to remove
2566 * @return a reference to this
2567 * @stable ICU 2.0
2568 */
2569 inline UnicodeString& removeBetween(int32_t start,
2570 int32_t limit = (int32_t)INT32_MAX);
2571
2572 /**
2573 * Retain only the characters in the range
2574 * [`start`, `limit`) from the UnicodeString object.
2575 * Removes characters before `start` and at and after `limit`.
2576 * @param start the offset of the first character to retain
2577 * @param limit the offset immediately following the range to retain
2578 * @return a reference to this
2579 * @stable ICU 4.4
2580 */
2581 inline UnicodeString &retainBetween(int32_t start, int32_t limit = INT32_MAX);
2582
2583 /* Length operations */
2584
2585 /**
2586 * Pad the start of this UnicodeString with the character `padChar`.
2587 * If the length of this UnicodeString is less than targetLength,
2588 * length() - targetLength copies of padChar will be added to the
2589 * beginning of this UnicodeString.
2590 * @param targetLength the desired length of the string
2591 * @param padChar the character to use for padding. Defaults to
2592 * space (U+0020)
2593 * @return TRUE if the text was padded, FALSE otherwise.
2594 * @stable ICU 2.0
2595 */
2596 UBool padLeading(int32_t targetLength,
2597 char16_t padChar = 0x0020);
2598
2599 /**
2600 * Pad the end of this UnicodeString with the character `padChar`.
2601 * If the length of this UnicodeString is less than targetLength,
2602 * length() - targetLength copies of padChar will be added to the
2603 * end of this UnicodeString.
2604 * @param targetLength the desired length of the string
2605 * @param padChar the character to use for padding. Defaults to
2606 * space (U+0020)
2607 * @return TRUE if the text was padded, FALSE otherwise.
2608 * @stable ICU 2.0
2609 */
2610 UBool padTrailing(int32_t targetLength,
2611 char16_t padChar = 0x0020);
2612
2613 /**
2614 * Truncate this UnicodeString to the `targetLength`.
2615 * @param targetLength the desired length of this UnicodeString.
2616 * @return TRUE if the text was truncated, FALSE otherwise
2617 * @stable ICU 2.0
2618 */
2619 inline UBool truncate(int32_t targetLength);
2620
2621 /**
2622 * Trims leading and trailing whitespace from this UnicodeString.
2623 * @return a reference to this
2624 * @stable ICU 2.0
2625 */
2626 UnicodeString& trim(void);
2627
2628
2629 /* Miscellaneous operations */
2630
2631 /**
2632 * Reverse this UnicodeString in place.
2633 * @return a reference to this
2634 * @stable ICU 2.0
2635 */
2636 inline UnicodeString& reverse(void);
2637
2638 /**
2639 * Reverse the range [`start`, `start + length`) in
2640 * this UnicodeString.
2641 * @param start the start of the range to reverse
2642 * @param length the number of characters to to reverse
2643 * @return a reference to this
2644 * @stable ICU 2.0
2645 */
2646 inline UnicodeString& reverse(int32_t start,
2647 int32_t length);
2648
2649 /**
2650 * Convert the characters in this to UPPER CASE following the conventions of
2651 * the default locale.
2652 * @return A reference to this.
2653 * @stable ICU 2.0
2654 */
2655 UnicodeString& toUpper(void);
2656
2657 /**
2658 * Convert the characters in this to UPPER CASE following the conventions of
2659 * a specific locale.
2660 * @param locale The locale containing the conventions to use.
2661 * @return A reference to this.
2662 * @stable ICU 2.0
2663 */
2664 UnicodeString& toUpper(const Locale& locale);
2665
2666 /**
2667 * Convert the characters in this to lower case following the conventions of
2668 * the default locale.
2669 * @return A reference to this.
2670 * @stable ICU 2.0
2671 */
2672 UnicodeString& toLower(void);
2673
2674 /**
2675 * Convert the characters in this to lower case following the conventions of
2676 * a specific locale.
2677 * @param locale The locale containing the conventions to use.
2678 * @return A reference to this.
2679 * @stable ICU 2.0
2680 */
2681 UnicodeString& toLower(const Locale& locale);
2682
2683#if !UCONFIG_NO_BREAK_ITERATION
2684
2685 /**
2686 * Titlecase this string, convenience function using the default locale.
2687 *
2688 * Casing is locale-dependent and context-sensitive.
2689 * Titlecasing uses a break iterator to find the first characters of words
2690 * that are to be titlecased. It titlecases those characters and lowercases
2691 * all others.
2692 *
2693 * The titlecase break iterator can be provided to customize for arbitrary
2694 * styles, using rules and dictionaries beyond the standard iterators.
2695 * It may be more efficient to always provide an iterator to avoid
2696 * opening and closing one for each string.
2697 * The standard titlecase iterator for the root locale implements the
2698 * algorithm of Unicode TR 21.
2699 *
2700 * This function uses only the setText(), first() and next() methods of the
2701 * provided break iterator.
2702 *
2703 * @param titleIter A break iterator to find the first characters of words
2704 * that are to be titlecased.
2705 * If none is provided (0), then a standard titlecase
2706 * break iterator is opened.
2707 * Otherwise the provided iterator is set to the string's text.
2708 * @return A reference to this.
2709 * @stable ICU 2.1
2710 */
2711 UnicodeString &toTitle(BreakIterator *titleIter);
2712
2713 /**
2714 * Titlecase this string.
2715 *
2716 * Casing is locale-dependent and context-sensitive.
2717 * Titlecasing uses a break iterator to find the first characters of words
2718 * that are to be titlecased. It titlecases those characters and lowercases
2719 * all others.
2720 *
2721 * The titlecase break iterator can be provided to customize for arbitrary
2722 * styles, using rules and dictionaries beyond the standard iterators.
2723 * It may be more efficient to always provide an iterator to avoid
2724 * opening and closing one for each string.
2725 * The standard titlecase iterator for the root locale implements the
2726 * algorithm of Unicode TR 21.
2727 *
2728 * This function uses only the setText(), first() and next() methods of the
2729 * provided break iterator.
2730 *
2731 * @param titleIter A break iterator to find the first characters of words
2732 * that are to be titlecased.
2733 * If none is provided (0), then a standard titlecase
2734 * break iterator is opened.
2735 * Otherwise the provided iterator is set to the string's text.
2736 * @param locale The locale to consider.
2737 * @return A reference to this.
2738 * @stable ICU 2.1
2739 */
2740 UnicodeString &toTitle(BreakIterator *titleIter, const Locale &locale);
2741
2742 /**
2743 * Titlecase this string, with options.
2744 *
2745 * Casing is locale-dependent and context-sensitive.
2746 * Titlecasing uses a break iterator to find the first characters of words
2747 * that are to be titlecased. It titlecases those characters and lowercases
2748 * all others. (This can be modified with options.)
2749 *
2750 * The titlecase break iterator can be provided to customize for arbitrary
2751 * styles, using rules and dictionaries beyond the standard iterators.
2752 * It may be more efficient to always provide an iterator to avoid
2753 * opening and closing one for each string.
2754 * The standard titlecase iterator for the root locale implements the
2755 * algorithm of Unicode TR 21.
2756 *
2757 * This function uses only the setText(), first() and next() methods of the
2758 * provided break iterator.
2759 *
2760 * @param titleIter A break iterator to find the first characters of words
2761 * that are to be titlecased.
2762 * If none is provided (0), then a standard titlecase
2763 * break iterator is opened.
2764 * Otherwise the provided iterator is set to the string's text.
2765 * @param locale The locale to consider.
2766 * @param options Options bit set, usually 0. See U_TITLECASE_NO_LOWERCASE,
2767 * U_TITLECASE_NO_BREAK_ADJUSTMENT, U_TITLECASE_ADJUST_TO_CASED,
2768 * U_TITLECASE_WHOLE_STRING, U_TITLECASE_SENTENCES.
2769 * @param options Options bit set, see ucasemap_open().
2770 * @return A reference to this.
2771 * @stable ICU 3.8
2772 */
2773 UnicodeString &toTitle(BreakIterator *titleIter, const Locale &locale, uint32_t options);
2774
2775#endif
2776
2777 /**
2778 * Case-folds the characters in this string.
2779 *
2780 * Case-folding is locale-independent and not context-sensitive,
2781 * but there is an option for whether to include or exclude mappings for dotted I
2782 * and dotless i that are marked with 'T' in CaseFolding.txt.
2783 *
2784 * The result may be longer or shorter than the original.
2785 *
2786 * @param options Either U_FOLD_CASE_DEFAULT or U_FOLD_CASE_EXCLUDE_SPECIAL_I
2787 * @return A reference to this.
2788 * @stable ICU 2.0
2789 */
2790 UnicodeString &foldCase(uint32_t options=0 /*U_FOLD_CASE_DEFAULT*/);
2791
2792 //========================================
2793 // Access to the internal buffer
2794 //========================================
2795
2796 /**
2797 * Get a read/write pointer to the internal buffer.
2798 * The buffer is guaranteed to be large enough for at least minCapacity char16_ts,
2799 * writable, and is still owned by the UnicodeString object.
2800 * Calls to getBuffer(minCapacity) must not be nested, and
2801 * must be matched with calls to releaseBuffer(newLength).
2802 * If the string buffer was read-only or shared,
2803 * then it will be reallocated and copied.
2804 *
2805 * An attempted nested call will return 0, and will not further modify the
2806 * state of the UnicodeString object.
2807 * It also returns 0 if the string is bogus.
2808 *
2809 * The actual capacity of the string buffer may be larger than minCapacity.
2810 * getCapacity() returns the actual capacity.
2811 * For many operations, the full capacity should be used to avoid reallocations.
2812 *
2813 * While the buffer is "open" between getBuffer(minCapacity)
2814 * and releaseBuffer(newLength), the following applies:
2815 * - The string length is set to 0.
2816 * - Any read API call on the UnicodeString object will behave like on a 0-length string.
2817 * - Any write API call on the UnicodeString object is disallowed and will have no effect.
2818 * - You can read from and write to the returned buffer.
2819 * - The previous string contents will still be in the buffer;
2820 * if you want to use it, then you need to call length() before getBuffer(minCapacity).
2821 * If the length() was greater than minCapacity, then any contents after minCapacity
2822 * may be lost.
2823 * The buffer contents is not NUL-terminated by getBuffer().
2824 * If length() < getCapacity() then you can terminate it by writing a NUL
2825 * at index length().
2826 * - You must call releaseBuffer(newLength) before and in order to
2827 * return to normal UnicodeString operation.
2828 *
2829 * @param minCapacity the minimum number of char16_ts that are to be available
2830 * in the buffer, starting at the returned pointer;
2831 * default to the current string capacity if minCapacity==-1
2832 * @return a writable pointer to the internal string buffer,
2833 * or nullptr if an error occurs (nested calls, out of memory)
2834 *
2835 * @see releaseBuffer
2836 * @see getTerminatedBuffer()
2837 * @stable ICU 2.0
2838 */
2839 char16_t *getBuffer(int32_t minCapacity);
2840
2841 /**
2842 * Release a read/write buffer on a UnicodeString object with an
2843 * "open" getBuffer(minCapacity).
2844 * This function must be called in a matched pair with getBuffer(minCapacity).
2845 * releaseBuffer(newLength) must be called if and only if a getBuffer(minCapacity) is "open".
2846 *
2847 * It will set the string length to newLength, at most to the current capacity.
2848 * If newLength==-1 then it will set the length according to the
2849 * first NUL in the buffer, or to the capacity if there is no NUL.
2850 *
2851 * After calling releaseBuffer(newLength) the UnicodeString is back to normal operation.
2852 *
2853 * @param newLength the new length of the UnicodeString object;
2854 * defaults to the current capacity if newLength is greater than that;
2855 * if newLength==-1, it defaults to u_strlen(buffer) but not more than
2856 * the current capacity of the string
2857 *
2858 * @see getBuffer(int32_t minCapacity)
2859 * @stable ICU 2.0
2860 */
2861 void releaseBuffer(int32_t newLength=-1);
2862
2863 /**
2864 * Get a read-only pointer to the internal buffer.
2865 * This can be called at any time on a valid UnicodeString.
2866 *
2867 * It returns 0 if the string is bogus, or
2868 * during an "open" getBuffer(minCapacity).
2869 *
2870 * It can be called as many times as desired.
2871 * The pointer that it returns will remain valid until the UnicodeString object is modified,
2872 * at which time the pointer is semantically invalidated and must not be used any more.
2873 *
2874 * The capacity of the buffer can be determined with getCapacity().
2875 * The part after length() may or may not be initialized and valid,
2876 * depending on the history of the UnicodeString object.
2877 *
2878 * The buffer contents is (probably) not NUL-terminated.
2879 * You can check if it is with
2880 * `(s.length() < s.getCapacity() && buffer[s.length()]==0)`.
2881 * (See getTerminatedBuffer().)
2882 *
2883 * The buffer may reside in read-only memory. Its contents must not
2884 * be modified.
2885 *
2886 * @return a read-only pointer to the internal string buffer,
2887 * or nullptr if the string is empty or bogus
2888 *
2889 * @see getBuffer(int32_t minCapacity)
2890 * @see getTerminatedBuffer()
2891 * @stable ICU 2.0
2892 */
2893 inline const char16_t *getBuffer() const;
2894
2895 /**
2896 * Get a read-only pointer to the internal buffer,
2897 * making sure that it is NUL-terminated.
2898 * This can be called at any time on a valid UnicodeString.
2899 *
2900 * It returns 0 if the string is bogus, or
2901 * during an "open" getBuffer(minCapacity), or if the buffer cannot
2902 * be NUL-terminated (because memory allocation failed).
2903 *
2904 * It can be called as many times as desired.
2905 * The pointer that it returns will remain valid until the UnicodeString object is modified,
2906 * at which time the pointer is semantically invalidated and must not be used any more.
2907 *
2908 * The capacity of the buffer can be determined with getCapacity().
2909 * The part after length()+1 may or may not be initialized and valid,
2910 * depending on the history of the UnicodeString object.
2911 *
2912 * The buffer contents is guaranteed to be NUL-terminated.
2913 * getTerminatedBuffer() may reallocate the buffer if a terminating NUL
2914 * is written.
2915 * For this reason, this function is not const, unlike getBuffer().
2916 * Note that a UnicodeString may also contain NUL characters as part of its contents.
2917 *
2918 * The buffer may reside in read-only memory. Its contents must not
2919 * be modified.
2920 *
2921 * @return a read-only pointer to the internal string buffer,
2922 * or 0 if the string is empty or bogus
2923 *
2924 * @see getBuffer(int32_t minCapacity)
2925 * @see getBuffer()
2926 * @stable ICU 2.2
2927 */
2928 const char16_t *getTerminatedBuffer();
2929
2930 //========================================
2931 // Constructors
2932 //========================================
2933
2934 /** Construct an empty UnicodeString.
2935 * @stable ICU 2.0
2936 */
2937 inline UnicodeString();
2938
2939 /**
2940 * Construct a UnicodeString with capacity to hold `capacity` char16_ts
2941 * @param capacity the number of char16_ts this UnicodeString should hold
2942 * before a resize is necessary; if count is greater than 0 and count
2943 * code points c take up more space than capacity, then capacity is adjusted
2944 * accordingly.
2945 * @param c is used to initially fill the string
2946 * @param count specifies how many code points c are to be written in the
2947 * string
2948 * @stable ICU 2.0
2949 */
2950 UnicodeString(int32_t capacity, UChar32 c, int32_t count);
2951
2952 /**
2953 * Single char16_t (code unit) constructor.
2954 *
2955 * It is recommended to mark this constructor "explicit" by
2956 * `-DUNISTR_FROM_CHAR_EXPLICIT=explicit`
2957 * on the compiler command line or similar.
2958 * @param ch the character to place in the UnicodeString
2959 * @stable ICU 2.0
2960 */
2961 UNISTR_FROM_CHAR_EXPLICIT UnicodeString(char16_t ch);
2962
2963 /**
2964 * Single UChar32 (code point) constructor.
2965 *
2966 * It is recommended to mark this constructor "explicit" by
2967 * `-DUNISTR_FROM_CHAR_EXPLICIT=explicit`
2968 * on the compiler command line or similar.
2969 * @param ch the character to place in the UnicodeString
2970 * @stable ICU 2.0
2971 */
2972 UNISTR_FROM_CHAR_EXPLICIT UnicodeString(UChar32 ch);
2973
2974 /**
2975 * char16_t* constructor.
2976 *
2977 * It is recommended to mark this constructor "explicit" by
2978 * `-DUNISTR_FROM_STRING_EXPLICIT=explicit`
2979 * on the compiler command line or similar.
2980 * @param text The characters to place in the UnicodeString. `text`
2981 * must be NULL (U+0000) terminated.
2982 * @stable ICU 2.0
2983 */
2984 UNISTR_FROM_STRING_EXPLICIT UnicodeString(const char16_t *text);
2985
2986#if !U_CHAR16_IS_TYPEDEF
2987 /**
2988 * uint16_t * constructor.
2989 * Delegates to UnicodeString(const char16_t *).
2990 *
2991 * It is recommended to mark this constructor "explicit" by
2992 * `-DUNISTR_FROM_STRING_EXPLICIT=explicit`
2993 * on the compiler command line or similar.
2994 * @param text NUL-terminated UTF-16 string
2995 * @stable ICU 59
2996 */
2997 UNISTR_FROM_STRING_EXPLICIT UnicodeString(const uint16_t *text) :
2998 UnicodeString(ConstChar16Ptr(text)) {}
2999#endif
3000
3001#if U_SIZEOF_WCHAR_T==2 || defined(U_IN_DOXYGEN)
3002 /**
3003 * wchar_t * constructor.
3004 * (Only defined if U_SIZEOF_WCHAR_T==2.)
3005 * Delegates to UnicodeString(const char16_t *).
3006 *
3007 * It is recommended to mark this constructor "explicit" by
3008 * `-DUNISTR_FROM_STRING_EXPLICIT=explicit`
3009 * on the compiler command line or similar.
3010 * @param text NUL-terminated UTF-16 string
3011 * @stable ICU 59
3012 */
3013 UNISTR_FROM_STRING_EXPLICIT UnicodeString(const wchar_t *text) :
3014 UnicodeString(ConstChar16Ptr(text)) {}
3015#endif
3016
3017 /**
3018 * nullptr_t constructor.
3019 * Effectively the same as the default constructor, makes an empty string object.
3020 *
3021 * It is recommended to mark this constructor "explicit" by
3022 * `-DUNISTR_FROM_STRING_EXPLICIT=explicit`
3023 * on the compiler command line or similar.
3024 * @param text nullptr
3025 * @stable ICU 59
3026 */
3027 UNISTR_FROM_STRING_EXPLICIT inline UnicodeString(const std::nullptr_t text);
3028
3029 /**
3030 * char16_t* constructor.
3031 * @param text The characters to place in the UnicodeString.
3032 * @param textLength The number of Unicode characters in `text`
3033 * to copy.
3034 * @stable ICU 2.0
3035 */
3036 UnicodeString(const char16_t *text,
3037 int32_t textLength);
3038
3039#if !U_CHAR16_IS_TYPEDEF
3040 /**
3041 * uint16_t * constructor.
3042 * Delegates to UnicodeString(const char16_t *, int32_t).
3043 * @param text UTF-16 string
3044 * @param textLength string length
3045 * @stable ICU 59
3046 */
3047 UnicodeString(const uint16_t *text, int32_t textLength) :
3048 UnicodeString(ConstChar16Ptr(text), textLength) {}
3049#endif
3050
3051#if U_SIZEOF_WCHAR_T==2 || defined(U_IN_DOXYGEN)
3052 /**
3053 * wchar_t * constructor.
3054 * (Only defined if U_SIZEOF_WCHAR_T==2.)
3055 * Delegates to UnicodeString(const char16_t *, int32_t).
3056 * @param text NUL-terminated UTF-16 string
3057 * @param textLength string length
3058 * @stable ICU 59
3059 */
3060 UnicodeString(const wchar_t *text, int32_t textLength) :
3061 UnicodeString(ConstChar16Ptr(text), textLength) {}
3062#endif
3063
3064 /**
3065 * nullptr_t constructor.
3066 * Effectively the same as the default constructor, makes an empty string object.
3067 * @param text nullptr
3068 * @param textLength ignored
3069 * @stable ICU 59
3070 */
3071 inline UnicodeString(const std::nullptr_t text, int32_t textLength);
3072
3073 /**
3074 * Readonly-aliasing char16_t* constructor.
3075 * The text will be used for the UnicodeString object, but
3076 * it will not be released when the UnicodeString is destroyed.
3077 * This has copy-on-write semantics:
3078 * When the string is modified, then the buffer is first copied into
3079 * newly allocated memory.
3080 * The aliased buffer is never modified.
3081 *
3082 * In an assignment to another UnicodeString, when using the copy constructor
3083 * or the assignment operator, the text will be copied.
3084 * When using fastCopyFrom(), the text will be aliased again,
3085 * so that both strings then alias the same readonly-text.
3086 *
3087 * @param isTerminated specifies if `text` is `NUL`-terminated.
3088 * This must be true if `textLength==-1`.
3089 * @param text The characters to alias for the UnicodeString.
3090 * @param textLength The number of Unicode characters in `text` to alias.
3091 * If -1, then this constructor will determine the length
3092 * by calling `u_strlen()`.
3093 * @stable ICU 2.0
3094 */
3095 UnicodeString(UBool isTerminated,
3096 ConstChar16Ptr text,
3097 int32_t textLength);
3098
3099 /**
3100 * Writable-aliasing char16_t* constructor.
3101 * The text will be used for the UnicodeString object, but
3102 * it will not be released when the UnicodeString is destroyed.
3103 * This has write-through semantics:
3104 * For as long as the capacity of the buffer is sufficient, write operations
3105 * will directly affect the buffer. When more capacity is necessary, then
3106 * a new buffer will be allocated and the contents copied as with regularly
3107 * constructed strings.
3108 * In an assignment to another UnicodeString, the buffer will be copied.
3109 * The extract(Char16Ptr dst) function detects whether the dst pointer is the same
3110 * as the string buffer itself and will in this case not copy the contents.
3111 *
3112 * @param buffer The characters to alias for the UnicodeString.
3113 * @param buffLength The number of Unicode characters in `buffer` to alias.
3114 * @param buffCapacity The size of `buffer` in char16_ts.
3115 * @stable ICU 2.0
3116 */
3117 UnicodeString(char16_t *buffer, int32_t buffLength, int32_t buffCapacity);
3118
3119#if !U_CHAR16_IS_TYPEDEF
3120 /**
3121 * Writable-aliasing uint16_t * constructor.
3122 * Delegates to UnicodeString(const char16_t *, int32_t, int32_t).
3123 * @param buffer writable buffer of/for UTF-16 text
3124 * @param buffLength length of the current buffer contents
3125 * @param buffCapacity buffer capacity
3126 * @stable ICU 59
3127 */
3128 UnicodeString(uint16_t *buffer, int32_t buffLength, int32_t buffCapacity) :
3129 UnicodeString(Char16Ptr(buffer), buffLength, buffCapacity) {}
3130#endif
3131
3132#if U_SIZEOF_WCHAR_T==2 || defined(U_IN_DOXYGEN)
3133 /**
3134 * Writable-aliasing wchar_t * constructor.
3135 * (Only defined if U_SIZEOF_WCHAR_T==2.)
3136 * Delegates to UnicodeString(const char16_t *, int32_t, int32_t).
3137 * @param buffer writable buffer of/for UTF-16 text
3138 * @param buffLength length of the current buffer contents
3139 * @param buffCapacity buffer capacity
3140 * @stable ICU 59
3141 */
3142 UnicodeString(wchar_t *buffer, int32_t buffLength, int32_t buffCapacity) :
3143 UnicodeString(Char16Ptr(buffer), buffLength, buffCapacity) {}
3144#endif
3145
3146 /**
3147 * Writable-aliasing nullptr_t constructor.
3148 * Effectively the same as the default constructor, makes an empty string object.
3149 * @param buffer nullptr
3150 * @param buffLength ignored
3151 * @param buffCapacity ignored
3152 * @stable ICU 59
3153 */
3154 inline UnicodeString(std::nullptr_t buffer, int32_t buffLength, int32_t buffCapacity);
3155
3156#if U_CHARSET_IS_UTF8 || !UCONFIG_NO_CONVERSION
3157
3158 /**
3159 * char* constructor.
3160 * Uses the default converter (and thus depends on the ICU conversion code)
3161 * unless U_CHARSET_IS_UTF8 is set to 1.
3162 *
3163 * For ASCII (really "invariant character") strings it is more efficient to use
3164 * the constructor that takes a US_INV (for its enum EInvariant).
3165 * For ASCII (invariant-character) string literals, see UNICODE_STRING and
3166 * UNICODE_STRING_SIMPLE.
3167 *
3168 * It is recommended to mark this constructor "explicit" by
3169 * `-DUNISTR_FROM_STRING_EXPLICIT=explicit`
3170 * on the compiler command line or similar.
3171 * @param codepageData an array of bytes, null-terminated,
3172 * in the platform's default codepage.
3173 * @stable ICU 2.0
3174 * @see UNICODE_STRING
3175 * @see UNICODE_STRING_SIMPLE
3176 */
3177 UNISTR_FROM_STRING_EXPLICIT UnicodeString(const char *codepageData);
3178
3179 /**
3180 * char* constructor.
3181 * Uses the default converter (and thus depends on the ICU conversion code)
3182 * unless U_CHARSET_IS_UTF8 is set to 1.
3183 * @param codepageData an array of bytes in the platform's default codepage.
3184 * @param dataLength The number of bytes in `codepageData`.
3185 * @stable ICU 2.0
3186 */
3187 UnicodeString(const char *codepageData, int32_t dataLength);
3188
3189#endif
3190
3191#if !UCONFIG_NO_CONVERSION
3192
3193 /**
3194 * char* constructor.
3195 * @param codepageData an array of bytes, null-terminated
3196 * @param codepage the encoding of `codepageData`. The special
3197 * value 0 for `codepage` indicates that the text is in the
3198 * platform's default codepage.
3199 *
3200 * If `codepage` is an empty string (`""`),
3201 * then a simple conversion is performed on the codepage-invariant
3202 * subset ("invariant characters") of the platform encoding. See utypes.h.
3203 * Recommendation: For invariant-character strings use the constructor
3204 * UnicodeString(const char *src, int32_t length, enum EInvariant inv)
3205 * because it avoids object code dependencies of UnicodeString on
3206 * the conversion code.
3207 *
3208 * @stable ICU 2.0
3209 */
3210 UnicodeString(const char *codepageData, const char *codepage);
3211
3212 /**
3213 * char* constructor.
3214 * @param codepageData an array of bytes.
3215 * @param dataLength The number of bytes in `codepageData`.
3216 * @param codepage the encoding of `codepageData`. The special
3217 * value 0 for `codepage` indicates that the text is in the
3218 * platform's default codepage.
3219 * If `codepage` is an empty string (`""`),
3220 * then a simple conversion is performed on the codepage-invariant
3221 * subset ("invariant characters") of the platform encoding. See utypes.h.
3222 * Recommendation: For invariant-character strings use the constructor
3223 * UnicodeString(const char *src, int32_t length, enum EInvariant inv)
3224 * because it avoids object code dependencies of UnicodeString on
3225 * the conversion code.
3226 *
3227 * @stable ICU 2.0
3228 */
3229 UnicodeString(const char *codepageData, int32_t dataLength, const char *codepage);
3230
3231 /**
3232 * char * / UConverter constructor.
3233 * This constructor uses an existing UConverter object to
3234 * convert the codepage string to Unicode and construct a UnicodeString
3235 * from that.
3236 *
3237 * The converter is reset at first.
3238 * If the error code indicates a failure before this constructor is called,
3239 * or if an error occurs during conversion or construction,
3240 * then the string will be bogus.
3241 *
3242 * This function avoids the overhead of opening and closing a converter if
3243 * multiple strings are constructed.
3244 *
3245 * @param src input codepage string
3246 * @param srcLength length of the input string, can be -1 for NUL-terminated strings
3247 * @param cnv converter object (ucnv_resetToUnicode() will be called),
3248 * can be NULL for the default converter
3249 * @param errorCode normal ICU error code
3250 * @stable ICU 2.0
3251 */
3252 UnicodeString(
3253 const char *src, int32_t srcLength,
3254 UConverter *cnv,
3255 UErrorCode &errorCode);
3256
3257#endif
3258
3259 /**
3260 * Constructs a Unicode string from an invariant-character char * string.
3261 * About invariant characters see utypes.h.
3262 * This constructor has no runtime dependency on conversion code and is
3263 * therefore recommended over ones taking a charset name string
3264 * (where the empty string "" indicates invariant-character conversion).
3265 *
3266 * Use the macro US_INV as the third, signature-distinguishing parameter.
3267 *
3268 * For example:
3269 * \code
3270 * void fn(const char *s) {
3271 * UnicodeString ustr(s, -1, US_INV);
3272 * // use ustr ...
3273 * }
3274 * \endcode
3275 * @param src String using only invariant characters.
3276 * @param textLength Length of src, or -1 if NUL-terminated.
3277 * @param inv Signature-distinguishing paramater, use US_INV.
3278 *
3279 * @see US_INV
3280 * @stable ICU 3.2
3281 */
3282 UnicodeString(const char *src, int32_t textLength, enum EInvariant inv);
3283
3284
3285 /**
3286 * Copy constructor.
3287 *
3288 * Starting with ICU 2.4, the assignment operator and the copy constructor
3289 * allocate a new buffer and copy the buffer contents even for readonly aliases.
3290 * By contrast, the fastCopyFrom() function implements the old,
3291 * more efficient but less safe behavior
3292 * of making this string also a readonly alias to the same buffer.
3293 *
3294 * If the source object has an "open" buffer from getBuffer(minCapacity),
3295 * then the copy is an empty string.
3296 *
3297 * @param that The UnicodeString object to copy.
3298 * @stable ICU 2.0
3299 * @see fastCopyFrom
3300 */
3301 UnicodeString(const UnicodeString& that);
3302
3303 /**
3304 * Move constructor; might leave src in bogus state.
3305 * This string will have the same contents and state that the source string had.
3306 * @param src source string
3307 * @stable ICU 56
3308 */
3309 UnicodeString(UnicodeString &&src) U_NOEXCEPT;
3310
3311 /**
3312 * 'Substring' constructor from tail of source string.
3313 * @param src The UnicodeString object to copy.
3314 * @param srcStart The offset into `src` at which to start copying.
3315 * @stable ICU 2.2
3316 */
3317 UnicodeString(const UnicodeString& src, int32_t srcStart);
3318
3319 /**
3320 * 'Substring' constructor from subrange of source string.
3321 * @param src The UnicodeString object to copy.
3322 * @param srcStart The offset into `src` at which to start copying.
3323 * @param srcLength The number of characters from `src` to copy.
3324 * @stable ICU 2.2
3325 */
3326 UnicodeString(const UnicodeString& src, int32_t srcStart, int32_t srcLength);
3327
3328 /**
3329 * Clone this object, an instance of a subclass of Replaceable.
3330 * Clones can be used concurrently in multiple threads.
3331 * If a subclass does not implement clone(), or if an error occurs,
3332 * then NULL is returned.
3333 * The caller must delete the clone.
3334 *
3335 * @return a clone of this object
3336 *
3337 * @see Replaceable::clone
3338 * @see getDynamicClassID
3339 * @stable ICU 2.6
3340 */
3341 virtual UnicodeString *clone() const;
3342
3343 /** Destructor.
3344 * @stable ICU 2.0
3345 */
3346 virtual ~UnicodeString();
3347
3348 /**
3349 * Create a UnicodeString from a UTF-8 string.
3350 * Illegal input is replaced with U+FFFD. Otherwise, errors result in a bogus string.
3351 * Calls u_strFromUTF8WithSub().
3352 *
3353 * @param utf8 UTF-8 input string.
3354 * Note that a StringPiece can be implicitly constructed
3355 * from a std::string or a NUL-terminated const char * string.
3356 * @return A UnicodeString with equivalent UTF-16 contents.
3357 * @see toUTF8
3358 * @see toUTF8String
3359 * @stable ICU 4.2
3360 */
3361 static UnicodeString fromUTF8(StringPiece utf8);
3362
3363 /**
3364 * Create a UnicodeString from a UTF-32 string.
3365 * Illegal input is replaced with U+FFFD. Otherwise, errors result in a bogus string.
3366 * Calls u_strFromUTF32WithSub().
3367 *
3368 * @param utf32 UTF-32 input string. Must not be NULL.
3369 * @param length Length of the input string, or -1 if NUL-terminated.
3370 * @return A UnicodeString with equivalent UTF-16 contents.
3371 * @see toUTF32
3372 * @stable ICU 4.2
3373 */
3374 static UnicodeString fromUTF32(const UChar32 *utf32, int32_t length);
3375
3376 /* Miscellaneous operations */
3377
3378 /**
3379 * Unescape a string of characters and return a string containing
3380 * the result. The following escape sequences are recognized:
3381 *
3382 * \\uhhhh 4 hex digits; h in [0-9A-Fa-f]
3383 * \\Uhhhhhhhh 8 hex digits
3384 * \\xhh 1-2 hex digits
3385 * \\ooo 1-3 octal digits; o in [0-7]
3386 * \\cX control-X; X is masked with 0x1F
3387 *
3388 * as well as the standard ANSI C escapes:
3389 *
3390 * \\a => U+0007, \\b => U+0008, \\t => U+0009, \\n => U+000A,
3391 * \\v => U+000B, \\f => U+000C, \\r => U+000D, \\e => U+001B,
3392 * \\" => U+0022, \\' => U+0027, \\? => U+003F, \\\\ => U+005C
3393 *
3394 * Anything else following a backslash is generically escaped. For
3395 * example, "[a\\-z]" returns "[a-z]".
3396 *
3397 * If an escape sequence is ill-formed, this method returns an empty
3398 * string. An example of an ill-formed sequence is "\\u" followed by
3399 * fewer than 4 hex digits.
3400 *
3401 * This function is similar to u_unescape() but not identical to it.
3402 * The latter takes a source char*, so it does escape recognition
3403 * and also invariant conversion.
3404 *
3405 * @return a string with backslash escapes interpreted, or an
3406 * empty string on error.
3407 * @see UnicodeString#unescapeAt()
3408 * @see u_unescape()
3409 * @see u_unescapeAt()
3410 * @stable ICU 2.0
3411 */
3412 UnicodeString unescape() const;
3413
3414 /**
3415 * Unescape a single escape sequence and return the represented
3416 * character. See unescape() for a listing of the recognized escape
3417 * sequences. The character at offset-1 is assumed (without
3418 * checking) to be a backslash. If the escape sequence is
3419 * ill-formed, or the offset is out of range, U_SENTINEL=-1 is
3420 * returned.
3421 *
3422 * @param offset an input output parameter. On input, it is the
3423 * offset into this string where the escape sequence is located,
3424 * after the initial backslash. On output, it is advanced after the
3425 * last character parsed. On error, it is not advanced at all.
3426 * @return the character represented by the escape sequence at
3427 * offset, or U_SENTINEL=-1 on error.
3428 * @see UnicodeString#unescape()
3429 * @see u_unescape()
3430 * @see u_unescapeAt()
3431 * @stable ICU 2.0
3432 */
3433 UChar32 unescapeAt(int32_t &offset) const;
3434
3435 /**
3436 * ICU "poor man's RTTI", returns a UClassID for this class.
3437 *
3438 * @stable ICU 2.2
3439 */
3440 static UClassID U_EXPORT2 getStaticClassID();
3441
3442 /**
3443 * ICU "poor man's RTTI", returns a UClassID for the actual class.
3444 *
3445 * @stable ICU 2.2
3446 */
3447 virtual UClassID getDynamicClassID() const;
3448
3449 //========================================
3450 // Implementation methods
3451 //========================================
3452
3453protected:
3454 /**
3455 * Implement Replaceable::getLength() (see jitterbug 1027).
3456 * @stable ICU 2.4
3457 */
3458 virtual int32_t getLength() const;
3459
3460 /**
3461 * The change in Replaceable to use virtual getCharAt() allows
3462 * UnicodeString::charAt() to be inline again (see jitterbug 709).
3463 * @stable ICU 2.4
3464 */
3465 virtual char16_t getCharAt(int32_t offset) const;
3466
3467 /**
3468 * The change in Replaceable to use virtual getChar32At() allows
3469 * UnicodeString::char32At() to be inline again (see jitterbug 709).
3470 * @stable ICU 2.4
3471 */
3472 virtual UChar32 getChar32At(int32_t offset) const;
3473
3474private:
3475 // For char* constructors. Could be made public.
3476 UnicodeString &setToUTF8(StringPiece utf8);
3477 // For extract(char*).
3478 // We could make a toUTF8(target, capacity, errorCode) public but not
3479 // this version: New API will be cleaner if we make callers create substrings
3480 // rather than having start+length on every method,
3481 // and it should take a UErrorCode&.
3482 int32_t
3483 toUTF8(int32_t start, int32_t len,
3484 char *target, int32_t capacity) const;
3485
3486 /**
3487 * Internal string contents comparison, called by operator==.
3488 * Requires: this & text not bogus and have same lengths.
3489 */
3490 UBool doEquals(const UnicodeString &text, int32_t len) const;
3491
3492 inline int8_t
3493 doCompare(int32_t start,
3494 int32_t length,
3495 const UnicodeString& srcText,
3496 int32_t srcStart,
3497 int32_t srcLength) const;
3498
3499 int8_t doCompare(int32_t start,
3500 int32_t length,
3501 const char16_t *srcChars,
3502 int32_t srcStart,
3503 int32_t srcLength) const;
3504
3505 inline int8_t
3506 doCompareCodePointOrder(int32_t start,
3507 int32_t length,
3508 const UnicodeString& srcText,
3509 int32_t srcStart,
3510 int32_t srcLength) const;
3511
3512 int8_t doCompareCodePointOrder(int32_t start,
3513 int32_t length,
3514 const char16_t *srcChars,
3515 int32_t srcStart,
3516 int32_t srcLength) const;
3517
3518 inline int8_t
3519 doCaseCompare(int32_t start,
3520 int32_t length,
3521 const UnicodeString &srcText,
3522 int32_t srcStart,
3523 int32_t srcLength,
3524 uint32_t options) const;
3525
3526 int8_t
3527 doCaseCompare(int32_t start,
3528 int32_t length,
3529 const char16_t *srcChars,
3530 int32_t srcStart,
3531 int32_t srcLength,
3532 uint32_t options) const;
3533
3534 int32_t doIndexOf(char16_t c,
3535 int32_t start,
3536 int32_t length) const;
3537
3538 int32_t doIndexOf(UChar32 c,
3539 int32_t start,
3540 int32_t length) const;
3541
3542 int32_t doLastIndexOf(char16_t c,
3543 int32_t start,
3544 int32_t length) const;
3545
3546 int32_t doLastIndexOf(UChar32 c,
3547 int32_t start,
3548 int32_t length) const;
3549
3550 void doExtract(int32_t start,
3551 int32_t length,
3552 char16_t *dst,
3553 int32_t dstStart) const;
3554
3555 inline void doExtract(int32_t start,
3556 int32_t length,
3557 UnicodeString& target) const;
3558
3559 inline char16_t doCharAt(int32_t offset) const;
3560
3561 UnicodeString& doReplace(int32_t start,
3562 int32_t length,
3563 const UnicodeString& srcText,
3564 int32_t srcStart,
3565 int32_t srcLength);
3566
3567 UnicodeString& doReplace(int32_t start,
3568 int32_t length,
3569 const char16_t *srcChars,
3570 int32_t srcStart,
3571 int32_t srcLength);
3572
3573 UnicodeString& doAppend(const UnicodeString& src, int32_t srcStart, int32_t srcLength);
3574 UnicodeString& doAppend(const char16_t *srcChars, int32_t srcStart, int32_t srcLength);
3575
3576 UnicodeString& doReverse(int32_t start,
3577 int32_t length);
3578
3579 // calculate hash code
3580 int32_t doHashCode(void) const;
3581
3582 // get pointer to start of array
3583 // these do not check for kOpenGetBuffer, unlike the public getBuffer() function
3584 inline char16_t* getArrayStart(void);
3585 inline const char16_t* getArrayStart(void) const;
3586
3587 inline UBool hasShortLength() const;
3588 inline int32_t getShortLength() const;
3589
3590 // A UnicodeString object (not necessarily its current buffer)
3591 // is writable unless it isBogus() or it has an "open" getBuffer(minCapacity).
3592 inline UBool isWritable() const;
3593
3594 // Is the current buffer writable?
3595 inline UBool isBufferWritable() const;
3596
3597 // None of the following does releaseArray().
3598 inline void setZeroLength();
3599 inline void setShortLength(int32_t len);
3600 inline void setLength(int32_t len);
3601 inline void setToEmpty();
3602 inline void setArray(char16_t *array, int32_t len, int32_t capacity); // sets length but not flags
3603
3604 // allocate the array; result may be the stack buffer
3605 // sets refCount to 1 if appropriate
3606 // sets fArray, fCapacity, and flags
3607 // sets length to 0
3608 // returns boolean for success or failure
3609 UBool allocate(int32_t capacity);
3610
3611 // release the array if owned
3612 void releaseArray(void);
3613
3614 // turn a bogus string into an empty one
3615 void unBogus();
3616
3617 // implements assigment operator, copy constructor, and fastCopyFrom()
3618 UnicodeString &copyFrom(const UnicodeString &src, UBool fastCopy=FALSE);
3619
3620 // Copies just the fields without memory management.
3621 void copyFieldsFrom(UnicodeString &src, UBool setSrcToBogus) U_NOEXCEPT;
3622
3623 // Pin start and limit to acceptable values.
3624 inline void pinIndex(int32_t& start) const;
3625 inline void pinIndices(int32_t& start,
3626 int32_t& length) const;
3627
3628#if !UCONFIG_NO_CONVERSION
3629
3630 /* Internal extract() using UConverter. */
3631 int32_t doExtract(int32_t start, int32_t length,
3632 char *dest, int32_t destCapacity,
3633 UConverter *cnv,
3634 UErrorCode &errorCode) const;
3635
3636 /*
3637 * Real constructor for converting from codepage data.
3638 * It assumes that it is called with !fRefCounted.
3639 *
3640 * If `codepage==0`, then the default converter
3641 * is used for the platform encoding.
3642 * If `codepage` is an empty string (`""`),
3643 * then a simple conversion is performed on the codepage-invariant
3644 * subset ("invariant characters") of the platform encoding. See utypes.h.
3645 */
3646 void doCodepageCreate(const char *codepageData,
3647 int32_t dataLength,
3648 const char *codepage);
3649
3650 /*
3651 * Worker function for creating a UnicodeString from
3652 * a codepage string using a UConverter.
3653 */
3654 void
3655 doCodepageCreate(const char *codepageData,
3656 int32_t dataLength,
3657 UConverter *converter,
3658 UErrorCode &status);
3659
3660#endif
3661
3662 /*
3663 * This function is called when write access to the array
3664 * is necessary.
3665 *
3666 * We need to make a copy of the array if
3667 * the buffer is read-only, or
3668 * the buffer is refCounted (shared), and refCount>1, or
3669 * the buffer is too small.
3670 *
3671 * Return FALSE if memory could not be allocated.
3672 */
3673 UBool cloneArrayIfNeeded(int32_t newCapacity = -1,
3674 int32_t growCapacity = -1,
3675 UBool doCopyArray = TRUE,
3676 int32_t **pBufferToDelete = 0,
3677 UBool forceClone = FALSE);
3678
3679 /**
3680 * Common function for UnicodeString case mappings.
3681 * The stringCaseMapper has the same type UStringCaseMapper
3682 * as in ustr_imp.h for ustrcase_map().
3683 */
3684 UnicodeString &
3685 caseMap(int32_t caseLocale, uint32_t options,
3686#if !UCONFIG_NO_BREAK_ITERATION
3687 BreakIterator *iter,
3688#endif
3689 UStringCaseMapper *stringCaseMapper);
3690
3691 // ref counting
3692 void addRef(void);
3693 int32_t removeRef(void);
3694 int32_t refCount(void) const;
3695
3696 // constants
3697 enum {
3698 /**
3699 * Size of stack buffer for short strings.
3700 * Must be at least U16_MAX_LENGTH for the single-code point constructor to work.
3701 * @see UNISTR_OBJECT_SIZE
3702 */
3703 US_STACKBUF_SIZE=(int32_t)(UNISTR_OBJECT_SIZE-sizeof(void *)-2)/U_SIZEOF_UCHAR,
3704 kInvalidUChar=0xffff, // U+FFFF returned by charAt(invalid index)
3705 kInvalidHashCode=0, // invalid hash code
3706 kEmptyHashCode=1, // hash code for empty string
3707
3708 // bit flag values for fLengthAndFlags
3709 kIsBogus=1, // this string is bogus, i.e., not valid or NULL
3710 kUsingStackBuffer=2,// using fUnion.fStackFields instead of fUnion.fFields
3711 kRefCounted=4, // there is a refCount field before the characters in fArray
3712 kBufferIsReadonly=8,// do not write to this buffer
3713 kOpenGetBuffer=16, // getBuffer(minCapacity) was called (is "open"),
3714 // and releaseBuffer(newLength) must be called
3715 kAllStorageFlags=0x1f,
3716
3717 kLengthShift=5, // remaining 11 bits for non-negative short length, or negative if long
3718 kLength1=1<<kLengthShift,
3719 kMaxShortLength=0x3ff, // max non-negative short length (leaves top bit 0)
3720 kLengthIsLarge=0xffe0, // short length < 0, real length is in fUnion.fFields.fLength
3721
3722 // combined values for convenience
3723 kShortString=kUsingStackBuffer,
3724 kLongString=kRefCounted,
3725 kReadonlyAlias=kBufferIsReadonly,
3726 kWritableAlias=0
3727 };
3728
3729 friend class UnicodeStringAppendable;
3730
3731 union StackBufferOrFields; // forward declaration necessary before friend declaration
3732 friend union StackBufferOrFields; // make US_STACKBUF_SIZE visible inside fUnion
3733
3734 /*
3735 * The following are all the class fields that are stored
3736 * in each UnicodeString object.
3737 * Note that UnicodeString has virtual functions,
3738 * therefore there is an implicit vtable pointer
3739 * as the first real field.
3740 * The fields should be aligned such that no padding is necessary.
3741 * On 32-bit machines, the size should be 32 bytes,
3742 * on 64-bit machines (8-byte pointers), it should be 40 bytes.
3743 *
3744 * We use a hack to achieve this.
3745 *
3746 * With at least some compilers, each of the following is forced to
3747 * a multiple of sizeof(pointer) [the largest field base unit here is a data pointer],
3748 * rounded up with additional padding if the fields do not already fit that requirement:
3749 * - sizeof(class UnicodeString)
3750 * - offsetof(UnicodeString, fUnion)
3751 * - sizeof(fUnion)
3752 * - sizeof(fStackFields)
3753 *
3754 * We optimize for the longest possible internal buffer for short strings.
3755 * fUnion.fStackFields begins with 2 bytes for storage flags
3756 * and the length of relatively short strings,
3757 * followed by the buffer for short string contents.
3758 * There is no padding inside fStackFields.
3759 *
3760 * Heap-allocated and aliased strings use fUnion.fFields.
3761 * Both fStackFields and fFields must begin with the same fields for flags and short length,
3762 * that is, those must have the same memory offsets inside the object,
3763 * because the flags must be inspected in order to decide which half of fUnion is being used.
3764 * We assume that the compiler does not reorder the fields.
3765 *
3766 * (Padding at the end of fFields is ok:
3767 * As long as it is no larger than fStackFields, it is not wasted space.)
3768 *
3769 * For some of the history of the UnicodeString class fields layout, see
3770 * - ICU ticket #11551 "longer UnicodeString contents in stack buffer"
3771 * - ICU ticket #11336 "UnicodeString: recombine stack buffer arrays"
3772 * - ICU ticket #8322 "why is sizeof(UnicodeString)==48?"
3773 */
3774 // (implicit) *vtable;
3775 union StackBufferOrFields {
3776 // fStackFields is used iff (fLengthAndFlags&kUsingStackBuffer) else fFields is used.
3777 // Each struct of the union must begin with fLengthAndFlags.
3778 struct {
3779 int16_t fLengthAndFlags; // bit fields: see constants above
3780 char16_t fBuffer[US_STACKBUF_SIZE]; // buffer for short strings
3781 } fStackFields;
3782 struct {
3783 int16_t fLengthAndFlags; // bit fields: see constants above
3784 int32_t fLength; // number of characters in fArray if >127; else undefined
3785 int32_t fCapacity; // capacity of fArray (in char16_ts)
3786 // array pointer last to minimize padding for machines with P128 data model
3787 // or pointer sizes that are not a power of 2
3788 char16_t *fArray; // the Unicode data
3789 } fFields;
3790 } fUnion;
3791};
3792
3793/**
3794 * Create a new UnicodeString with the concatenation of two others.
3795 *
3796 * @param s1 The first string to be copied to the new one.
3797 * @param s2 The second string to be copied to the new one, after s1.
3798 * @return UnicodeString(s1).append(s2)
3799 * @stable ICU 2.8
3800 */
3801U_COMMON_API UnicodeString U_EXPORT2
3802operator+ (const UnicodeString &s1, const UnicodeString &s2);
3803
3804//========================================
3805// Inline members
3806//========================================
3807
3808//========================================
3809// Privates
3810//========================================
3811
3812inline void
3813UnicodeString::pinIndex(int32_t& start) const
3814{
3815 // pin index
3816 if(start < 0) {
3817 start = 0;
3818 } else if(start > length()) {
3819 start = length();
3820 }
3821}
3822
3823inline void
3824UnicodeString::pinIndices(int32_t& start,
3825 int32_t& _length) const
3826{
3827 // pin indices
3828 int32_t len = length();
3829 if(start < 0) {
3830 start = 0;
3831 } else if(start > len) {
3832 start = len;
3833 }
3834 if(_length < 0) {
3835 _length = 0;
3836 } else if(_length > (len - start)) {
3837 _length = (len - start);
3838 }
3839}
3840
3841inline char16_t*
3842UnicodeString::getArrayStart() {
3843 return (fUnion.fFields.fLengthAndFlags&kUsingStackBuffer) ?
3844 fUnion.fStackFields.fBuffer : fUnion.fFields.fArray;
3845}
3846
3847inline const char16_t*
3848UnicodeString::getArrayStart() const {
3849 return (fUnion.fFields.fLengthAndFlags&kUsingStackBuffer) ?
3850 fUnion.fStackFields.fBuffer : fUnion.fFields.fArray;
3851}
3852
3853//========================================
3854// Default constructor
3855//========================================
3856
3857inline
3858UnicodeString::UnicodeString() {
3859 fUnion.fStackFields.fLengthAndFlags=kShortString;
3860}
3861
3862inline UnicodeString::UnicodeString(const std::nullptr_t /*text*/) {
3863 fUnion.fStackFields.fLengthAndFlags=kShortString;
3864}
3865
3866inline UnicodeString::UnicodeString(const std::nullptr_t /*text*/, int32_t /*length*/) {
3867 fUnion.fStackFields.fLengthAndFlags=kShortString;
3868}
3869
3870inline UnicodeString::UnicodeString(std::nullptr_t /*buffer*/, int32_t /*buffLength*/, int32_t /*buffCapacity*/) {
3871 fUnion.fStackFields.fLengthAndFlags=kShortString;
3872}
3873
3874//========================================
3875// Read-only implementation methods
3876//========================================
3877inline UBool
3878UnicodeString::hasShortLength() const {
3879 return fUnion.fFields.fLengthAndFlags>=0;
3880}
3881
3882inline int32_t
3883UnicodeString::getShortLength() const {
3884 // fLengthAndFlags must be non-negative -> short length >= 0
3885 // and arithmetic or logical shift does not matter.
3886 return fUnion.fFields.fLengthAndFlags>>kLengthShift;
3887}
3888
3889inline int32_t
3890UnicodeString::length() const {
3891 return hasShortLength() ? getShortLength() : fUnion.fFields.fLength;
3892}
3893
3894inline int32_t
3895UnicodeString::getCapacity() const {
3896 return (fUnion.fFields.fLengthAndFlags&kUsingStackBuffer) ?
3897 US_STACKBUF_SIZE : fUnion.fFields.fCapacity;
3898}
3899
3900inline int32_t
3901UnicodeString::hashCode() const
3902{ return doHashCode(); }
3903
3904inline UBool
3905UnicodeString::isBogus() const
3906{ return (UBool)(fUnion.fFields.fLengthAndFlags & kIsBogus); }
3907
3908inline UBool
3909UnicodeString::isWritable() const
3910{ return (UBool)!(fUnion.fFields.fLengthAndFlags&(kOpenGetBuffer|kIsBogus)); }
3911
3912inline UBool
3913UnicodeString::isBufferWritable() const
3914{
3915 return (UBool)(
3916 !(fUnion.fFields.fLengthAndFlags&(kOpenGetBuffer|kIsBogus|kBufferIsReadonly)) &&
3917 (!(fUnion.fFields.fLengthAndFlags&kRefCounted) || refCount()==1));
3918}
3919
3920inline const char16_t *
3921UnicodeString::getBuffer() const {
3922 if(fUnion.fFields.fLengthAndFlags&(kIsBogus|kOpenGetBuffer)) {
3923 return nullptr;
3924 } else if(fUnion.fFields.fLengthAndFlags&kUsingStackBuffer) {
3925 return fUnion.fStackFields.fBuffer;
3926 } else {
3927 return fUnion.fFields.fArray;
3928 }
3929}
3930
3931//========================================
3932// Read-only alias methods
3933//========================================
3934inline int8_t
3935UnicodeString::doCompare(int32_t start,
3936 int32_t thisLength,
3937 const UnicodeString& srcText,
3938 int32_t srcStart,
3939 int32_t srcLength) const
3940{
3941 if(srcText.isBogus()) {
3942 return (int8_t)!isBogus(); // 0 if both are bogus, 1 otherwise
3943 } else {
3944 srcText.pinIndices(srcStart, srcLength);
3945 return doCompare(start, thisLength, srcText.getArrayStart(), srcStart, srcLength);
3946 }
3947}
3948
3949inline UBool
3950UnicodeString::operator== (const UnicodeString& text) const
3951{
3952 if(isBogus()) {
3953 return text.isBogus();
3954 } else {
3955 int32_t len = length(), textLength = text.length();
3956 return !text.isBogus() && len == textLength && doEquals(text, len);
3957 }
3958}
3959
3960inline UBool
3961UnicodeString::operator!= (const UnicodeString& text) const
3962{ return (! operator==(text)); }
3963
3964inline UBool
3965UnicodeString::operator> (const UnicodeString& text) const
3966{ return doCompare(0, length(), text, 0, text.length()) == 1; }
3967
3968inline UBool
3969UnicodeString::operator< (const UnicodeString& text) const
3970{ return doCompare(0, length(), text, 0, text.length()) == -1; }
3971
3972inline UBool
3973UnicodeString::operator>= (const UnicodeString& text) const
3974{ return doCompare(0, length(), text, 0, text.length()) != -1; }
3975
3976inline UBool
3977UnicodeString::operator<= (const UnicodeString& text) const
3978{ return doCompare(0, length(), text, 0, text.length()) != 1; }
3979
3980inline int8_t
3981UnicodeString::compare(const UnicodeString& text) const
3982{ return doCompare(0, length(), text, 0, text.length()); }
3983
3984inline int8_t
3985UnicodeString::compare(int32_t start,
3986 int32_t _length,
3987 const UnicodeString& srcText) const
3988{ return doCompare(start, _length, srcText, 0, srcText.length()); }
3989
3990inline int8_t
3991UnicodeString::compare(ConstChar16Ptr srcChars,
3992 int32_t srcLength) const
3993{ return doCompare(0, length(), srcChars, 0, srcLength); }
3994
3995inline int8_t
3996UnicodeString::compare(int32_t start,
3997 int32_t _length,
3998 const UnicodeString& srcText,
3999 int32_t srcStart,
4000 int32_t srcLength) const
4001{ return doCompare(start, _length, srcText, srcStart, srcLength); }
4002
4003inline int8_t
4004UnicodeString::compare(int32_t start,
4005 int32_t _length,
4006 const char16_t *srcChars) const
4007{ return doCompare(start, _length, srcChars, 0, _length); }
4008
4009inline int8_t
4010UnicodeString::compare(int32_t start,
4011 int32_t _length,
4012 const char16_t *srcChars,
4013 int32_t srcStart,
4014 int32_t srcLength) const
4015{ return doCompare(start, _length, srcChars, srcStart, srcLength); }
4016
4017inline int8_t
4018UnicodeString::compareBetween(int32_t start,
4019 int32_t limit,
4020 const UnicodeString& srcText,
4021 int32_t srcStart,
4022 int32_t srcLimit) const
4023{ return doCompare(start, limit - start,
4024 srcText, srcStart, srcLimit - srcStart); }
4025
4026inline int8_t
4027UnicodeString::doCompareCodePointOrder(int32_t start,
4028 int32_t thisLength,
4029 const UnicodeString& srcText,
4030 int32_t srcStart,
4031 int32_t srcLength) const
4032{
4033 if(srcText.isBogus()) {
4034 return (int8_t)!isBogus(); // 0 if both are bogus, 1 otherwise
4035 } else {
4036 srcText.pinIndices(srcStart, srcLength);
4037 return doCompareCodePointOrder(start, thisLength, srcText.getArrayStart(), srcStart, srcLength);
4038 }
4039}
4040
4041inline int8_t
4042UnicodeString::compareCodePointOrder(const UnicodeString& text) const
4043{ return doCompareCodePointOrder(0, length(), text, 0, text.length()); }
4044
4045inline int8_t
4046UnicodeString::compareCodePointOrder(int32_t start,
4047 int32_t _length,
4048 const UnicodeString& srcText) const
4049{ return doCompareCodePointOrder(start, _length, srcText, 0, srcText.length()); }
4050
4051inline int8_t
4052UnicodeString::compareCodePointOrder(ConstChar16Ptr srcChars,
4053 int32_t srcLength) const
4054{ return doCompareCodePointOrder(0, length(), srcChars, 0, srcLength); }
4055
4056inline int8_t
4057UnicodeString::compareCodePointOrder(int32_t start,
4058 int32_t _length,
4059 const UnicodeString& srcText,
4060 int32_t srcStart,
4061 int32_t srcLength) const
4062{ return doCompareCodePointOrder(start, _length, srcText, srcStart, srcLength); }
4063
4064inline int8_t
4065UnicodeString::compareCodePointOrder(int32_t start,
4066 int32_t _length,
4067 const char16_t *srcChars) const
4068{ return doCompareCodePointOrder(start, _length, srcChars, 0, _length); }
4069
4070inline int8_t
4071UnicodeString::compareCodePointOrder(int32_t start,
4072 int32_t _length,
4073 const char16_t *srcChars,
4074 int32_t srcStart,
4075 int32_t srcLength) const
4076{ return doCompareCodePointOrder(start, _length, srcChars, srcStart, srcLength); }
4077
4078inline int8_t
4079UnicodeString::compareCodePointOrderBetween(int32_t start,
4080 int32_t limit,
4081 const UnicodeString& srcText,
4082 int32_t srcStart,
4083 int32_t srcLimit) const
4084{ return doCompareCodePointOrder(start, limit - start,
4085 srcText, srcStart, srcLimit - srcStart); }
4086
4087inline int8_t
4088UnicodeString::doCaseCompare(int32_t start,
4089 int32_t thisLength,
4090 const UnicodeString &srcText,
4091 int32_t srcStart,
4092 int32_t srcLength,
4093 uint32_t options) const
4094{
4095 if(srcText.isBogus()) {
4096 return (int8_t)!isBogus(); // 0 if both are bogus, 1 otherwise
4097 } else {
4098 srcText.pinIndices(srcStart, srcLength);
4099 return doCaseCompare(start, thisLength, srcText.getArrayStart(), srcStart, srcLength, options);
4100 }
4101}
4102
4103inline int8_t
4104UnicodeString::caseCompare(const UnicodeString &text, uint32_t options) const {
4105 return doCaseCompare(0, length(), text, 0, text.length(), options);
4106}
4107
4108inline int8_t
4109UnicodeString::caseCompare(int32_t start,
4110 int32_t _length,
4111 const UnicodeString &srcText,
4112 uint32_t options) const {
4113 return doCaseCompare(start, _length, srcText, 0, srcText.length(), options);
4114}
4115
4116inline int8_t
4117UnicodeString::caseCompare(ConstChar16Ptr srcChars,
4118 int32_t srcLength,
4119 uint32_t options) const {
4120 return doCaseCompare(0, length(), srcChars, 0, srcLength, options);
4121}
4122
4123inline int8_t
4124UnicodeString::caseCompare(int32_t start,
4125 int32_t _length,
4126 const UnicodeString &srcText,
4127 int32_t srcStart,
4128 int32_t srcLength,
4129 uint32_t options) const {
4130 return doCaseCompare(start, _length, srcText, srcStart, srcLength, options);
4131}
4132
4133inline int8_t
4134UnicodeString::caseCompare(int32_t start,
4135 int32_t _length,
4136 const char16_t *srcChars,
4137 uint32_t options) const {
4138 return doCaseCompare(start, _length, srcChars, 0, _length, options);
4139}
4140
4141inline int8_t
4142UnicodeString::caseCompare(int32_t start,
4143 int32_t _length,
4144 const char16_t *srcChars,
4145 int32_t srcStart,
4146 int32_t srcLength,
4147 uint32_t options) const {
4148 return doCaseCompare(start, _length, srcChars, srcStart, srcLength, options);
4149}
4150
4151inline int8_t
4152UnicodeString::caseCompareBetween(int32_t start,
4153 int32_t limit,
4154 const UnicodeString &srcText,
4155 int32_t srcStart,
4156 int32_t srcLimit,
4157 uint32_t options) const {
4158 return doCaseCompare(start, limit - start, srcText, srcStart, srcLimit - srcStart, options);
4159}
4160
4161inline int32_t
4162UnicodeString::indexOf(const UnicodeString& srcText,
4163 int32_t srcStart,
4164 int32_t srcLength,
4165 int32_t start,
4166 int32_t _length) const
4167{
4168 if(!srcText.isBogus()) {
4169 srcText.pinIndices(srcStart, srcLength);
4170 if(srcLength > 0) {
4171 return indexOf(srcText.getArrayStart(), srcStart, srcLength, start, _length);
4172 }
4173 }
4174 return -1;
4175}
4176
4177inline int32_t
4178UnicodeString::indexOf(const UnicodeString& text) const
4179{ return indexOf(text, 0, text.length(), 0, length()); }
4180
4181inline int32_t
4182UnicodeString::indexOf(const UnicodeString& text,
4183 int32_t start) const {
4184 pinIndex(start);
4185 return indexOf(text, 0, text.length(), start, length() - start);
4186}
4187
4188inline int32_t
4189UnicodeString::indexOf(const UnicodeString& text,
4190 int32_t start,
4191 int32_t _length) const
4192{ return indexOf(text, 0, text.length(), start, _length); }
4193
4194inline int32_t
4195UnicodeString::indexOf(const char16_t *srcChars,
4196 int32_t srcLength,
4197 int32_t start) const {
4198 pinIndex(start);
4199 return indexOf(srcChars, 0, srcLength, start, length() - start);
4200}
4201
4202inline int32_t
4203UnicodeString::indexOf(ConstChar16Ptr srcChars,
4204 int32_t srcLength,
4205 int32_t start,
4206 int32_t _length) const
4207{ return indexOf(srcChars, 0, srcLength, start, _length); }
4208
4209inline int32_t
4210UnicodeString::indexOf(char16_t c,
4211 int32_t start,
4212 int32_t _length) const
4213{ return doIndexOf(c, start, _length); }
4214
4215inline int32_t
4216UnicodeString::indexOf(UChar32 c,
4217 int32_t start,
4218 int32_t _length) const
4219{ return doIndexOf(c, start, _length); }
4220
4221inline int32_t
4222UnicodeString::indexOf(char16_t c) const
4223{ return doIndexOf(c, 0, length()); }
4224
4225inline int32_t
4226UnicodeString::indexOf(UChar32 c) const
4227{ return indexOf(c, 0, length()); }
4228
4229inline int32_t
4230UnicodeString::indexOf(char16_t c,
4231 int32_t start) const {
4232 pinIndex(start);
4233 return doIndexOf(c, start, length() - start);
4234}
4235
4236inline int32_t
4237UnicodeString::indexOf(UChar32 c,
4238 int32_t start) const {
4239 pinIndex(start);
4240 return indexOf(c, start, length() - start);
4241}
4242
4243inline int32_t
4244UnicodeString::lastIndexOf(ConstChar16Ptr srcChars,
4245 int32_t srcLength,
4246 int32_t start,
4247 int32_t _length) const
4248{ return lastIndexOf(srcChars, 0, srcLength, start, _length); }
4249
4250inline int32_t
4251UnicodeString::lastIndexOf(const char16_t *srcChars,
4252 int32_t srcLength,
4253 int32_t start) const {
4254 pinIndex(start);
4255 return lastIndexOf(srcChars, 0, srcLength, start, length() - start);
4256}
4257
4258inline int32_t
4259UnicodeString::lastIndexOf(const UnicodeString& srcText,
4260 int32_t srcStart,
4261 int32_t srcLength,
4262 int32_t start,
4263 int32_t _length) const
4264{
4265 if(!srcText.isBogus()) {
4266 srcText.pinIndices(srcStart, srcLength);
4267 if(srcLength > 0) {
4268 return lastIndexOf(srcText.getArrayStart(), srcStart, srcLength, start, _length);
4269 }
4270 }
4271 return -1;
4272}
4273
4274inline int32_t
4275UnicodeString::lastIndexOf(const UnicodeString& text,
4276 int32_t start,
4277 int32_t _length) const
4278{ return lastIndexOf(text, 0, text.length(), start, _length); }
4279
4280inline int32_t
4281UnicodeString::lastIndexOf(const UnicodeString& text,
4282 int32_t start) const {
4283 pinIndex(start);
4284 return lastIndexOf(text, 0, text.length(), start, length() - start);
4285}
4286
4287inline int32_t
4288UnicodeString::lastIndexOf(const UnicodeString& text) const
4289{ return lastIndexOf(text, 0, text.length(), 0, length()); }
4290
4291inline int32_t
4292UnicodeString::lastIndexOf(char16_t c,
4293 int32_t start,
4294 int32_t _length) const
4295{ return doLastIndexOf(c, start, _length); }
4296
4297inline int32_t
4298UnicodeString::lastIndexOf(UChar32 c,
4299 int32_t start,
4300 int32_t _length) const {
4301 return doLastIndexOf(c, start, _length);
4302}
4303
4304inline int32_t
4305UnicodeString::lastIndexOf(char16_t c) const
4306{ return doLastIndexOf(c, 0, length()); }
4307
4308inline int32_t
4309UnicodeString::lastIndexOf(UChar32 c) const {
4310 return lastIndexOf(c, 0, length());
4311}
4312
4313inline int32_t
4314UnicodeString::lastIndexOf(char16_t c,
4315 int32_t start) const {
4316 pinIndex(start);
4317 return doLastIndexOf(c, start, length() - start);
4318}
4319
4320inline int32_t
4321UnicodeString::lastIndexOf(UChar32 c,
4322 int32_t start) const {
4323 pinIndex(start);
4324 return lastIndexOf(c, start, length() - start);
4325}
4326
4327inline UBool
4328UnicodeString::startsWith(const UnicodeString& text) const
4329{ return compare(0, text.length(), text, 0, text.length()) == 0; }
4330
4331inline UBool
4332UnicodeString::startsWith(const UnicodeString& srcText,
4333 int32_t srcStart,
4334 int32_t srcLength) const
4335{ return doCompare(0, srcLength, srcText, srcStart, srcLength) == 0; }
4336
4337inline UBool
4338UnicodeString::startsWith(ConstChar16Ptr srcChars, int32_t srcLength) const {
4339 if(srcLength < 0) {
4340 srcLength = u_strlen(toUCharPtr(srcChars));
4341 }
4342 return doCompare(0, srcLength, srcChars, 0, srcLength) == 0;
4343}
4344
4345inline UBool
4346UnicodeString::startsWith(const char16_t *srcChars, int32_t srcStart, int32_t srcLength) const {
4347 if(srcLength < 0) {
4348 srcLength = u_strlen(toUCharPtr(srcChars));
4349 }
4350 return doCompare(0, srcLength, srcChars, srcStart, srcLength) == 0;
4351}
4352
4353inline UBool
4354UnicodeString::endsWith(const UnicodeString& text) const
4355{ return doCompare(length() - text.length(), text.length(),
4356 text, 0, text.length()) == 0; }
4357
4358inline UBool
4359UnicodeString::endsWith(const UnicodeString& srcText,
4360 int32_t srcStart,
4361 int32_t srcLength) const {
4362 srcText.pinIndices(srcStart, srcLength);
4363 return doCompare(length() - srcLength, srcLength,
4364 srcText, srcStart, srcLength) == 0;
4365}
4366
4367inline UBool
4368UnicodeString::endsWith(ConstChar16Ptr srcChars,
4369 int32_t srcLength) const {
4370 if(srcLength < 0) {
4371 srcLength = u_strlen(toUCharPtr(srcChars));
4372 }
4373 return doCompare(length() - srcLength, srcLength,
4374 srcChars, 0, srcLength) == 0;
4375}
4376
4377inline UBool
4378UnicodeString::endsWith(const char16_t *srcChars,
4379 int32_t srcStart,
4380 int32_t srcLength) const {
4381 if(srcLength < 0) {
4382 srcLength = u_strlen(toUCharPtr(srcChars + srcStart));
4383 }
4384 return doCompare(length() - srcLength, srcLength,
4385 srcChars, srcStart, srcLength) == 0;
4386}
4387
4388//========================================
4389// replace
4390//========================================
4391inline UnicodeString&
4392UnicodeString::replace(int32_t start,
4393 int32_t _length,
4394 const UnicodeString& srcText)
4395{ return doReplace(start, _length, srcText, 0, srcText.length()); }
4396
4397inline UnicodeString&
4398UnicodeString::replace(int32_t start,
4399 int32_t _length,
4400 const UnicodeString& srcText,
4401 int32_t srcStart,
4402 int32_t srcLength)
4403{ return doReplace(start, _length, srcText, srcStart, srcLength); }
4404
4405inline UnicodeString&
4406UnicodeString::replace(int32_t start,
4407 int32_t _length,
4408 ConstChar16Ptr srcChars,
4409 int32_t srcLength)
4410{ return doReplace(start, _length, srcChars, 0, srcLength); }
4411
4412inline UnicodeString&
4413UnicodeString::replace(int32_t start,
4414 int32_t _length,
4415 const char16_t *srcChars,
4416 int32_t srcStart,
4417 int32_t srcLength)
4418{ return doReplace(start, _length, srcChars, srcStart, srcLength); }
4419
4420inline UnicodeString&
4421UnicodeString::replace(int32_t start,
4422 int32_t _length,
4423 char16_t srcChar)
4424{ return doReplace(start, _length, &srcChar, 0, 1); }
4425
4426inline UnicodeString&
4427UnicodeString::replaceBetween(int32_t start,
4428 int32_t limit,
4429 const UnicodeString& srcText)
4430{ return doReplace(start, limit - start, srcText, 0, srcText.length()); }
4431
4432inline UnicodeString&
4433UnicodeString::replaceBetween(int32_t start,
4434 int32_t limit,
4435 const UnicodeString& srcText,
4436 int32_t srcStart,
4437 int32_t srcLimit)
4438{ return doReplace(start, limit - start, srcText, srcStart, srcLimit - srcStart); }
4439
4440inline UnicodeString&
4441UnicodeString::findAndReplace(const UnicodeString& oldText,
4442 const UnicodeString& newText)
4443{ return findAndReplace(0, length(), oldText, 0, oldText.length(),
4444 newText, 0, newText.length()); }
4445
4446inline UnicodeString&
4447UnicodeString::findAndReplace(int32_t start,
4448 int32_t _length,
4449 const UnicodeString& oldText,
4450 const UnicodeString& newText)
4451{ return findAndReplace(start, _length, oldText, 0, oldText.length(),
4452 newText, 0, newText.length()); }
4453
4454// ============================
4455// extract
4456// ============================
4457inline void
4458UnicodeString::doExtract(int32_t start,
4459 int32_t _length,
4460 UnicodeString& target) const
4461{ target.replace(0, target.length(), *this, start, _length); }
4462
4463inline void
4464UnicodeString::extract(int32_t start,
4465 int32_t _length,
4466 Char16Ptr target,
4467 int32_t targetStart) const
4468{ doExtract(start, _length, target, targetStart); }
4469
4470inline void
4471UnicodeString::extract(int32_t start,
4472 int32_t _length,
4473 UnicodeString& target) const
4474{ doExtract(start, _length, target); }
4475
4476#if !UCONFIG_NO_CONVERSION
4477
4478inline int32_t
4479UnicodeString::extract(int32_t start,
4480 int32_t _length,
4481 char *dst,
4482 const char *codepage) const
4483
4484{
4485 // This dstSize value will be checked explicitly
4486 return extract(start, _length, dst, dst!=0 ? 0xffffffff : 0, codepage);
4487}
4488
4489#endif
4490
4491inline void
4492UnicodeString::extractBetween(int32_t start,
4493 int32_t limit,
4494 char16_t *dst,
4495 int32_t dstStart) const {
4496 pinIndex(start);
4497 pinIndex(limit);
4498 doExtract(start, limit - start, dst, dstStart);
4499}
4500
4501inline UnicodeString
4502UnicodeString::tempSubStringBetween(int32_t start, int32_t limit) const {
4503 return tempSubString(start, limit - start);
4504}
4505
4506inline char16_t
4507UnicodeString::doCharAt(int32_t offset) const
4508{
4509 if((uint32_t)offset < (uint32_t)length()) {
4510 return getArrayStart()[offset];
4511 } else {
4512 return kInvalidUChar;
4513 }
4514}
4515
4516inline char16_t
4517UnicodeString::charAt(int32_t offset) const
4518{ return doCharAt(offset); }
4519
4520inline char16_t
4521UnicodeString::operator[] (int32_t offset) const
4522{ return doCharAt(offset); }
4523
4524inline UBool
4525UnicodeString::isEmpty() const {
4526 // Arithmetic or logical right shift does not matter: only testing for 0.
4527 return (fUnion.fFields.fLengthAndFlags>>kLengthShift) == 0;
4528}
4529
4530//========================================
4531// Write implementation methods
4532//========================================
4533inline void
4534UnicodeString::setZeroLength() {
4535 fUnion.fFields.fLengthAndFlags &= kAllStorageFlags;
4536}
4537
4538inline void
4539UnicodeString::setShortLength(int32_t len) {
4540 // requires 0 <= len <= kMaxShortLength
4541 fUnion.fFields.fLengthAndFlags =
4542 (int16_t)((fUnion.fFields.fLengthAndFlags & kAllStorageFlags) | (len << kLengthShift));
4543}
4544
4545inline void
4546UnicodeString::setLength(int32_t len) {
4547 if(len <= kMaxShortLength) {
4548 setShortLength(len);
4549 } else {
4550 fUnion.fFields.fLengthAndFlags |= kLengthIsLarge;
4551 fUnion.fFields.fLength = len;
4552 }
4553}
4554
4555inline void
4556UnicodeString::setToEmpty() {
4557 fUnion.fFields.fLengthAndFlags = kShortString;
4558}
4559
4560inline void
4561UnicodeString::setArray(char16_t *array, int32_t len, int32_t capacity) {
4562 setLength(len);
4563 fUnion.fFields.fArray = array;
4564 fUnion.fFields.fCapacity = capacity;
4565}
4566
4567inline UnicodeString&
4568UnicodeString::operator= (char16_t ch)
4569{ return doReplace(0, length(), &ch, 0, 1); }
4570
4571inline UnicodeString&
4572UnicodeString::operator= (UChar32 ch)
4573{ return replace(0, length(), ch); }
4574
4575inline UnicodeString&
4576UnicodeString::setTo(const UnicodeString& srcText,
4577 int32_t srcStart,
4578 int32_t srcLength)
4579{
4580 unBogus();
4581 return doReplace(0, length(), srcText, srcStart, srcLength);
4582}
4583
4584inline UnicodeString&
4585UnicodeString::setTo(const UnicodeString& srcText,
4586 int32_t srcStart)
4587{
4588 unBogus();
4589 srcText.pinIndex(srcStart);
4590 return doReplace(0, length(), srcText, srcStart, srcText.length() - srcStart);
4591}
4592
4593inline UnicodeString&
4594UnicodeString::setTo(const UnicodeString& srcText)
4595{
4596 return copyFrom(srcText);
4597}
4598
4599inline UnicodeString&
4600UnicodeString::setTo(const char16_t *srcChars,
4601 int32_t srcLength)
4602{
4603 unBogus();
4604 return doReplace(0, length(), srcChars, 0, srcLength);
4605}
4606
4607inline UnicodeString&
4608UnicodeString::setTo(char16_t srcChar)
4609{
4610 unBogus();
4611 return doReplace(0, length(), &srcChar, 0, 1);
4612}
4613
4614inline UnicodeString&
4615UnicodeString::setTo(UChar32 srcChar)
4616{
4617 unBogus();
4618 return replace(0, length(), srcChar);
4619}
4620
4621inline UnicodeString&
4622UnicodeString::append(const UnicodeString& srcText,
4623 int32_t srcStart,
4624 int32_t srcLength)
4625{ return doAppend(srcText, srcStart, srcLength); }
4626
4627inline UnicodeString&
4628UnicodeString::append(const UnicodeString& srcText)
4629{ return doAppend(srcText, 0, srcText.length()); }
4630
4631inline UnicodeString&
4632UnicodeString::append(const char16_t *srcChars,
4633 int32_t srcStart,
4634 int32_t srcLength)
4635{ return doAppend(srcChars, srcStart, srcLength); }
4636
4637inline UnicodeString&
4638UnicodeString::append(ConstChar16Ptr srcChars,
4639 int32_t srcLength)
4640{ return doAppend(srcChars, 0, srcLength); }
4641
4642inline UnicodeString&
4643UnicodeString::append(char16_t srcChar)
4644{ return doAppend(&srcChar, 0, 1); }
4645
4646inline UnicodeString&
4647UnicodeString::operator+= (char16_t ch)
4648{ return doAppend(&ch, 0, 1); }
4649
4650inline UnicodeString&
4651UnicodeString::operator+= (UChar32 ch) {
4652 return append(ch);
4653}
4654
4655inline UnicodeString&
4656UnicodeString::operator+= (const UnicodeString& srcText)
4657{ return doAppend(srcText, 0, srcText.length()); }
4658
4659inline UnicodeString&
4660UnicodeString::insert(int32_t start,
4661 const UnicodeString& srcText,
4662 int32_t srcStart,
4663 int32_t srcLength)
4664{ return doReplace(start, 0, srcText, srcStart, srcLength); }
4665
4666inline UnicodeString&
4667UnicodeString::insert(int32_t start,
4668 const UnicodeString& srcText)
4669{ return doReplace(start, 0, srcText, 0, srcText.length()); }
4670
4671inline UnicodeString&
4672UnicodeString::insert(int32_t start,
4673 const char16_t *srcChars,
4674 int32_t srcStart,
4675 int32_t srcLength)
4676{ return doReplace(start, 0, srcChars, srcStart, srcLength); }
4677
4678inline UnicodeString&
4679UnicodeString::insert(int32_t start,
4680 ConstChar16Ptr srcChars,
4681 int32_t srcLength)
4682{ return doReplace(start, 0, srcChars, 0, srcLength); }
4683
4684inline UnicodeString&
4685UnicodeString::insert(int32_t start,
4686 char16_t srcChar)
4687{ return doReplace(start, 0, &srcChar, 0, 1); }
4688
4689inline UnicodeString&
4690UnicodeString::insert(int32_t start,
4691 UChar32 srcChar)
4692{ return replace(start, 0, srcChar); }
4693
4694
4695inline UnicodeString&
4696UnicodeString::remove()
4697{
4698 // remove() of a bogus string makes the string empty and non-bogus
4699 if(isBogus()) {
4700 setToEmpty();
4701 } else {
4702 setZeroLength();
4703 }
4704 return *this;
4705}
4706
4707inline UnicodeString&
4708UnicodeString::remove(int32_t start,
4709 int32_t _length)
4710{
4711 if(start <= 0 && _length == INT32_MAX) {
4712 // remove(guaranteed everything) of a bogus string makes the string empty and non-bogus
4713 return remove();
4714 }
4715 return doReplace(start, _length, NULL, 0, 0);
4716}
4717
4718inline UnicodeString&
4719UnicodeString::removeBetween(int32_t start,
4720 int32_t limit)
4721{ return doReplace(start, limit - start, NULL, 0, 0); }
4722
4723inline UnicodeString &
4724UnicodeString::retainBetween(int32_t start, int32_t limit) {
4725 truncate(limit);
4726 return doReplace(0, start, NULL, 0, 0);
4727}
4728
4729inline UBool
4730UnicodeString::truncate(int32_t targetLength)
4731{
4732 if(isBogus() && targetLength == 0) {
4733 // truncate(0) of a bogus string makes the string empty and non-bogus
4734 unBogus();
4735 return FALSE;
4736 } else if((uint32_t)targetLength < (uint32_t)length()) {
4737 setLength(targetLength);
4738 return TRUE;
4739 } else {
4740 return FALSE;
4741 }
4742}
4743
4744inline UnicodeString&
4745UnicodeString::reverse()
4746{ return doReverse(0, length()); }
4747
4748inline UnicodeString&
4749UnicodeString::reverse(int32_t start,
4750 int32_t _length)
4751{ return doReverse(start, _length); }
4752
4753U_NAMESPACE_END
4754
4755#endif /* U_SHOW_CPLUSPLUS_API */
4756
4757#endif
4758