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| 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 |
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