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7c673cae | 1 | /* |
11fdf7f2 | 2 | ** $Id: llex.h,v 1.79 2016/05/02 14:02:12 roberto Exp $ |
7c673cae FG |
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 | */ | |
26 | enum 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 | ||
43 | typedef union { | |
44 | lua_Number r; | |
45 | lua_Integer i; | |
46 | TString *ts; | |
47 | } SemInfo; /* semantics information */ | |
48 | ||
49 | ||
50 | typedef 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 */ | |
58 | typedef 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 */ | |
7c673cae FG |
72 | } LexState; |
73 | ||
74 | ||
75 | LUAI_FUNC void luaX_init (lua_State *L); | |
76 | LUAI_FUNC void luaX_setinput (lua_State *L, LexState *ls, ZIO *z, | |
77 | TString *source, int firstchar); | |
78 | LUAI_FUNC TString *luaX_newstring (LexState *ls, const char *str, size_t l); | |
79 | LUAI_FUNC void luaX_next (LexState *ls); | |
80 | LUAI_FUNC int luaX_lookahead (LexState *ls); | |
81 | LUAI_FUNC l_noret luaX_syntaxerror (LexState *ls, const char *s); | |
82 | LUAI_FUNC const char *luaX_token2str (LexState *ls, int token); | |
83 | ||
84 | ||
85 | #endif |