1/*
2** $Id: llex.h,v 1.79.1.1 2017/04/19 17:20:42 roberto Exp $
3** Lexical Analyzer
4** See Copyright Notice in lua.h
5*/
6
7#ifndef llex_h
8#define llex_h
9
10#include "lobject.h"
11#include "lzio.h"
12
13
14#define FIRST_RESERVED 257
15
16
17#if !defined(LUA_ENV)
18#define LUA_ENV "_ENV"
19#endif
20
21
22/*
23* WARNING: if you change the order of this enumeration,
24* grep "ORDER RESERVED"
25*/
26enum RESERVED {
27 /* terminal symbols denoted by reserved words */
28 TK_AND = FIRST_RESERVED, TK_BREAK,
29 TK_DO, TK_ELSE, TK_ELSEIF, TK_END, TK_FALSE, TK_FOR, TK_FUNCTION,
30 TK_GOTO, TK_IF, TK_IN, TK_LOCAL, TK_NIL, TK_NOT, TK_OR, TK_REPEAT,
31 TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE,
32 /* other terminal symbols */
33 TK_IDIV, TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE,
34 TK_SHL, TK_SHR,
35 TK_DBCOLON, TK_EOS,
36 TK_FLT, TK_INT, TK_NAME, TK_STRING
37};
38
39/* number of reserved words */
40#define NUM_RESERVED (cast(int, TK_WHILE-FIRST_RESERVED+1))
41
42
43typedef union {
44 lua_Number r;
45 lua_Integer i;
46 TString *ts;
47} SemInfo; /* semantics information */
48
49
50typedef struct Token {
51 int token;
52 SemInfo seminfo;
53} Token;
54
55
56/* state of the lexer plus state of the parser when shared by all
57 functions */
58typedef struct LexState {
59 int current; /* current character (charint) */
60 int linenumber; /* input line counter */
61 int lastline; /* line of last token 'consumed' */
62 Token t; /* current token */
63 Token lookahead; /* look ahead token */
64 struct FuncState *fs; /* current function (parser) */
65 struct lua_State *L;
66 ZIO *z; /* input stream */
67 Mbuffer *buff; /* buffer for tokens */
68 Table *h; /* to avoid collection/reuse strings */
69 struct Dyndata *dyd; /* dynamic structures used by the parser */
70 TString *source; /* current source name */
71 TString *envn; /* environment variable name */
72} LexState;
73
74
75LUAI_FUNC void luaX_init (lua_State *L);
76LUAI_FUNC void luaX_setinput (lua_State *L, LexState *ls, ZIO *z,
77 TString *source, int firstchar);
78LUAI_FUNC TString *luaX_newstring (LexState *ls, const char *str, size_t l);
79LUAI_FUNC void luaX_next (LexState *ls);
80LUAI_FUNC int luaX_lookahead (LexState *ls);
81LUAI_FUNC l_noret luaX_syntaxerror (LexState *ls, const char *s);
82LUAI_FUNC const char *luaX_token2str (LexState *ls, int token);
83
84
85#endif
86