1// Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
2// for details. All rights reserved. Use of this source code is governed by a
3// BSD-style license that can be found in the LICENSE file.
4
5#ifndef RUNTIME_VM_UNIBROW_H_
6#define RUNTIME_VM_UNIBROW_H_
7
8#include <sys/types.h>
9
10#include "vm/globals.h"
11
12/**
13 * \file
14 * Definitions and convenience functions for working with unicode.
15 */
16
17namespace unibrow {
18
19// A cache used in case conversion. It caches the value for characters
20// that either have no mapping or map to a single character independent
21// of context. Characters that map to more than one character or that
22// map differently depending on context are always looked up.
23template <class T, intptr_t size = 256>
24class Mapping {
25 public:
26 inline Mapping() {}
27 inline intptr_t get(int32_t c, int32_t n, int32_t* result);
28
29 private:
30 friend class Test;
31 intptr_t CalculateValue(int32_t c, int32_t n, int32_t* result);
32 struct CacheEntry {
33 inline CacheEntry() : code_point_(kNoChar), offset_(0) {}
34 inline CacheEntry(int32_t code_point, signed offset)
35 : code_point_(code_point), offset_(offset) {}
36 int32_t code_point_;
37 signed offset_;
38 static const intptr_t kNoChar = (1 << 21) - 1;
39 };
40 static const intptr_t kSize = size;
41 static const intptr_t kMask = kSize - 1;
42 CacheEntry entries_[kSize];
43};
44
45struct Letter {
46 static bool Is(int32_t c);
47};
48struct Ecma262Canonicalize {
49 static const intptr_t kMaxWidth = 1;
50 static intptr_t Convert(int32_t c,
51 int32_t n,
52 int32_t* result,
53 bool* allow_caching_ptr);
54};
55struct Ecma262UnCanonicalize {
56 static const intptr_t kMaxWidth = 4;
57 static intptr_t Convert(int32_t c,
58 int32_t n,
59 int32_t* result,
60 bool* allow_caching_ptr);
61};
62struct CanonicalizationRange {
63 static const intptr_t kMaxWidth = 1;
64 static intptr_t Convert(int32_t c,
65 int32_t n,
66 int32_t* result,
67 bool* allow_caching_ptr);
68};
69
70} // namespace unibrow
71
72#endif // RUNTIME_VM_UNIBROW_H_
73