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ba8b5c17 | 1 | /* |
2 | ** $Id: llex.h,v 1.72 2011/11/30 12:43:51 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 | ||
18 | /* | |
19 | * WARNING: if you change the order of this enumeration, | |
20 | * grep "ORDER RESERVED" | |
21 | */ | |
22 | enum RESERVED { | |
23 | /* terminal symbols denoted by reserved words */ | |
24 | TK_AND = FIRST_RESERVED, TK_BREAK, | |
25 | TK_DO, TK_ELSE, TK_ELSEIF, TK_END, TK_FALSE, TK_FOR, TK_FUNCTION, | |
26 | TK_GOTO, TK_IF, TK_IN, TK_LOCAL, TK_NIL, TK_NOT, TK_OR, TK_REPEAT, | |
27 | TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE, | |
28 | /* other terminal symbols */ | |
29 | TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE, TK_DBCOLON, TK_EOS, | |
30 | TK_NUMBER, TK_NAME, TK_STRING | |
31 | }; | |
32 | ||
33 | /* number of reserved words */ | |
34 | #define NUM_RESERVED (cast(int, TK_WHILE-FIRST_RESERVED+1)) | |
35 | ||
36 | ||
37 | typedef union { | |
38 | lua_Number r; | |
39 | TString *ts; | |
40 | } SemInfo; /* semantics information */ | |
41 | ||
42 | ||
43 | typedef struct Token { | |
44 | int token; | |
45 | SemInfo seminfo; | |
46 | } Token; | |
47 | ||
48 | ||
49 | /* state of the lexer plus state of the parser when shared by all | |
50 | functions */ | |
51 | typedef struct LexState { | |
52 | int current; /* current character (charint) */ | |
53 | int linenumber; /* input line counter */ | |
54 | int lastline; /* line of last token `consumed' */ | |
55 | Token t; /* current token */ | |
56 | Token lookahead; /* look ahead token */ | |
57 | struct FuncState *fs; /* current function (parser) */ | |
58 | struct lua_State *L; | |
59 | ZIO *z; /* input stream */ | |
60 | Mbuffer *buff; /* buffer for tokens */ | |
61 | struct Dyndata *dyd; /* dynamic structures used by the parser */ | |
62 | TString *source; /* current source name */ | |
63 | TString *envn; /* environment variable name */ | |
64 | char decpoint; /* locale decimal point */ | |
65 | } LexState; | |
66 | ||
67 | ||
68 | LUAI_FUNC void luaX_init (lua_State *L); | |
69 | LUAI_FUNC void luaX_setinput (lua_State *L, LexState *ls, ZIO *z, | |
70 | TString *source, int firstchar); | |
71 | LUAI_FUNC TString *luaX_newstring (LexState *ls, const char *str, size_t l); | |
72 | LUAI_FUNC void luaX_next (LexState *ls); | |
73 | LUAI_FUNC int luaX_lookahead (LexState *ls); | |
74 | LUAI_FUNC l_noret luaX_syntaxerror (LexState *ls, const char *s); | |
75 | LUAI_FUNC const char *luaX_token2str (LexState *ls, int token); | |
76 | ||
77 | ||
78 | #endif |