/*
** $Id: llex.h,v 1.72 2011/11/30 12:43:51 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



/*
* 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_GOTO, 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_DBCOLON, TK_EOS,
    TK_NUMBER, TK_NAME, TK_STRING
};

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


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


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


/* state of the lexer plus state of the parser when shared by all
   functions */
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;  /* current function (parser) */
    struct lua_State *L;
    ZIO *z;  /* input stream */
    Mbuffer *buff;  /* buffer for tokens */
    struct Dyndata *dyd;  /* dynamic structures used by the parser */
    TString *source;  /* current source name */
    TString *envn;  /* environment variable 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, int firstchar);
LUAI_FUNC TString *luaX_newstring(LexState *ls, const char *str, size_t l);
LUAI_FUNC void luaX_next(LexState *ls);
LUAI_FUNC int luaX_lookahead(LexState *ls);
LUAI_FUNC l_noret luaX_syntaxerror(LexState *ls, const char *s);
LUAI_FUNC const char *luaX_token2str(LexState *ls, int token);


#endif
