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# lua/llex.h

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    00001 /*
    00002 ** $Id: llex.h,v 1.58 2006/03/23 18:23:32 roberto Exp $
    00003 ** Lexical Analyzer
    00004 ** See Copyright Notice in lua.h
    00005 */
    00006
    00007 #ifndef llex_h
    00008 #define llex_h
    00009
    00010 #include "lobject.h"
    00011 #include "lzio.h"
    00012
    00013
    00014 #define FIRST_RESERVED  257
    00015
    00016 /* maximum length of a reserved word */
    00017 #define TOKEN_LEN       (sizeof("function")/sizeof(char))
    00018
    00019
    00020 /*
    00021 * WARNING: if you change the order of this enumeration,
    00022 * grep "ORDER RESERVED"
    00023 */
    00024 enum RESERVED {
    00025   /* terminal symbols denoted by reserved words */
    00026   TK_AND = FIRST_RESERVED, TK_BREAK,
    00027   TK_DO, TK_ELSE, TK_ELSEIF, TK_END, TK_FALSE, TK_FOR, TK_FUNCTION,
    00028   TK_IF, TK_IN, TK_LOCAL, TK_NIL, TK_NOT, TK_OR, TK_REPEAT,
    00029   TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE,
    00030   /* other terminal symbols */
    00031   TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE, TK_NUMBER,
    00032   TK_NAME, TK_STRING, TK_EOS
    00033 };
    00034
    00035 /* number of reserved words */
    00036 #define NUM_RESERVED    (cast(int, TK_WHILE-FIRST_RESERVED+1))
    00037
    00038
    00039 /* array with token `names' */
    00040 LUAI_DATA const char *const luaX_tokens [];
    00041
    00042
    00043 typedef union {
    00044   lua_Number r;
    00045   TString *ts;
    00046 } SemInfo;  /* semantics information */
    00047
    00048
    00049 typedef struct Token {
    00050   int token;
    00051   SemInfo seminfo;
    00052 } Token;
    00053
    00054
    00055 typedef struct LexState {
    00056   int current;  /* current character (charint) */
    00057   int linenumber;  /* input line counter */
    00058   int lastline;  /* line of last token `consumed' */
    00059   Token t;  /* current token */
    00060   Token lookahead;  /* look ahead token */
    00061   struct FuncState *fs;  /* `FuncState' is private to the parser */
    00062   struct lua_State *L;
    00063   ZIO *z;  /* input stream */
    00064   Mbuffer *buff;  /* buffer for tokens */
    00065   TString *source;  /* current source name */
    00066   char decpoint;  /* locale decimal point */
    00067 } LexState;
    00068
    00069
    00070 LUAI_FUNC void luaX_init (lua_State *L);
    00071 LUAI_FUNC void luaX_setinput (lua_State *L, LexState *ls, ZIO *z,
    00072                               TString *source);
    00073 LUAI_FUNC TString *luaX_newstring (LexState *ls, const char *str, size_t l);
    00074 LUAI_FUNC void luaX_next (LexState *ls);
    00075 LUAI_FUNC void luaX_lookahead (LexState *ls);
    00076 LUAI_FUNC void luaX_lexerror (LexState *ls, const char *msg, int token);
    00077 LUAI_FUNC void luaX_syntaxerror (LexState *ls, const char *s);
    00078 LUAI_FUNC const char *luaX_token2str (LexState *ls, int token);
    00079
    00080
    00081 #endif