text: /*
  ** $Id: llex.h,v 1.79 2016/05/02 14:02:12 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
  
  
  #if !defined(LUA_ENV)
  #define LUA_ENV		"_ENV"
  #endif
  
  
  /*
  * 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_IDIV, TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE,
    TK_SHL, TK_SHR,
    TK_DBCOLON, TK_EOS,
    TK_FLT, TK_INT, TK_NAME, TK_STRING
  };
  
  /* number of reserved words */
  #define NUM_RESERVED	(cast(int, TK_WHILE-FIRST_RESERVED+1))
  
  
  typedef union {
    lua_Number r;
    lua_Integer i;
    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 */
    Table *h;  /* to avoid collection/reuse strings */
    struct Dyndata *dyd;  /* dynamic structures used by the parser */
    TString *source;  /* current source name */
    TString *envn;  /* environment variable name */
  } 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
  