Lua2RTT/lua/llex.h

/*
** $Id: llex.h,v 1.58.1.1 2007/12/27 13:02:25 roberto Exp $
** Lexical Analyzer
** See Copyright Notice in lua.h
*/

#ifndef llex_h
#define llex_h

#include "lobject.h"
#include "lzio.h"


#define FIRST_RESERVED  257

/* maximum length of a reserved word */
#define TOKEN_LEN   (sizeof("function")/sizeof(char))


/*
* WARNING: if you change the order of this enumeration,
* grep "ORDER RESERVED"
*/
enum RESERVED
{
    /* terminal symbols denoted by reserved words */
    TK_AND = FIRST_RESERVED, TK_BREAK,
    TK_DO, TK_ELSE, TK_ELSEIF, TK_END, TK_FALSE, TK_FOR, TK_FUNCTION,
    TK_IF, TK_IN, TK_LOCAL, TK_NIL, TK_NOT, TK_OR, TK_REPEAT,
    TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE,
    /* other terminal symbols */
    TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE, TK_NUMBER,
    TK_NAME, TK_STRING, TK_EOS
};

/* number of reserved words */
#define NUM_RESERVED    (cast(int, TK_WHILE-FIRST_RESERVED+1))


/* array with token `names' */
LUAI_DATA const char *const luaX_tokens [];


typedef union
{
    lua_Number r;
    TString *ts;
} SemInfo;  /* semantics information */


typedef struct Token
{
    int token;
    SemInfo seminfo;
} Token;


typedef struct LexState
{
    int current;  /* current character (charint) */
    int linenumber;  /* input line counter */
    int lastline;  /* line of last token `consumed' */
    Token t;  /* current token */
    Token lookahead;  /* look ahead token */
    struct FuncState *fs;  /* `FuncState' is private to the parser */
    struct lua_State *L;
    ZIO *z;  /* input stream */
    Mbuffer *buff;  /* buffer for tokens */
    TString *source;  /* current source name */
    char decpoint;  /* locale decimal point */
} LexState;


LUAI_FUNC void luaX_init(lua_State *L);
LUAI_FUNC void luaX_setinput(lua_State *L, LexState *ls, ZIO *z,
                             TString *source);
LUAI_FUNC TString *luaX_newstring(LexState *ls, const char *str, size_t l);
LUAI_FUNC void luaX_next(LexState *ls);
LUAI_FUNC void luaX_lookahead(LexState *ls);
LUAI_FUNC void luaX_lexerror(LexState *ls, const char *msg, int token);
LUAI_FUNC void luaX_syntaxerror(LexState *ls, const char *s);
LUAI_FUNC const char *luaX_token2str(LexState *ls, int token);


#endif