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Root/lua/llex.h

1/*
2** $Id: llex.h,v 1.58 2006/03/23 18:23:32 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_RESERVED257
15
16/* maximum length of a reserved word */
17#define TOKEN_LEN(sizeof("function")/sizeof(char))
18
19
20/*
21* WARNING: if you change the order of this enumeration,
22* grep "ORDER RESERVED"
23*/
24enum RESERVED {
25 /* terminal symbols denoted by reserved words */
26 TK_AND = FIRST_RESERVED, TK_BREAK,
27 TK_DO, TK_ELSE, TK_ELSEIF, TK_END, TK_FALSE, TK_FOR, TK_FUNCTION,
28 TK_IF, TK_IN, TK_LOCAL, TK_NIL, TK_NOT, TK_OR, TK_REPEAT,
29 TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE,
30 /* other terminal symbols */
31 TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE, TK_NUMBER,
32 TK_NAME, TK_STRING, TK_EOS
33};
34
35/* number of reserved words */
36#define NUM_RESERVED(cast(int, TK_WHILE-FIRST_RESERVED+1))
37
38
39/* array with token `names' */
40LUAI_DATA const char *const luaX_tokens [];
41
42
43typedef union {
44 lua_Number r;
45 TString *ts;
46} SemInfo; /* semantics information */
47
48
49typedef struct Token {
50 int token;
51 SemInfo seminfo;
52} Token;
53
54
55typedef struct LexState {
56 int current; /* current character (charint) */
57 int linenumber; /* input line counter */
58 int lastline; /* line of last token `consumed' */
59 Token t; /* current token */
60 Token lookahead; /* look ahead token */
61 struct FuncState *fs; /* `FuncState' is private to the parser */
62 struct lua_State *L;
63 ZIO *z; /* input stream */
64 Mbuffer *buff; /* buffer for tokens */
65 TString *source; /* current source name */
66 char decpoint; /* locale decimal point */
67} LexState;
68
69
70LUAI_FUNC void luaX_init (lua_State *L);
71LUAI_FUNC void luaX_setinput (lua_State *L, LexState *ls, ZIO *z,
72 TString *source);
73LUAI_FUNC TString *luaX_newstring (LexState *ls, const char *str, size_t l);
74LUAI_FUNC void luaX_next (LexState *ls);
75LUAI_FUNC void luaX_lookahead (LexState *ls);
76LUAI_FUNC void luaX_lexerror (LexState *ls, const char *msg, int token);
77LUAI_FUNC void luaX_syntaxerror (LexState *ls, const char *s);
78LUAI_FUNC const char *luaX_token2str (LexState *ls, int token);
79
80
81#endif

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