/*

** $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