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 |