1 /* 2 ** $Id: llex.h,v 1.79.1.1 2017/04/19 17:20:42 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 #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 */ 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 86