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  1. /*
  2. ** $Id: llex.h,v 1.72 2011/11/30 12:43:51 roberto Exp $
  3. ** Lexical Analyzer
  4. ** See Copyright Notice in lua.h
  5. */
  6.  
  7. #ifndef llex_h
  8. #define llex_h
  9.  
  10. #include "lobject.h"
  11. #include "lzio.h"
  12.  
  13.  
  14. #define FIRST_RESERVED  257
  15.  
  16.  
  17.  
  18. /*
  19. * WARNING: if you change the order of this enumeration,
  20. * grep "ORDER RESERVED"
  21. */
  22. enum RESERVED {
  23.   /* terminal symbols denoted by reserved words */
  24.   TK_AND = FIRST_RESERVED, TK_BREAK,
  25.   TK_DO, TK_ELSE, TK_ELSEIF, TK_END, TK_FALSE, TK_FOR, TK_FUNCTION,
  26.   TK_GOTO, TK_IF, TK_IN, TK_LOCAL, TK_NIL, TK_NOT, TK_OR, TK_REPEAT,
  27.   TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE,
  28.   /* other terminal symbols */
  29.   TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE, TK_DBCOLON, TK_EOS,
  30.   TK_NUMBER, TK_NAME, TK_STRING
  31. };
  32.  
  33. /* number of reserved words */
  34. #define NUM_RESERVED    (cast(int, TK_WHILE-FIRST_RESERVED+1))
  35.  
  36.  
  37. typedef union {
  38.   lua_Number r;
  39.   TString *ts;
  40. } SemInfo;  /* semantics information */
  41.  
  42.  
  43. typedef struct Token {
  44.   int token;
  45.   SemInfo seminfo;
  46. } Token;
  47.  
  48.  
  49. /* state of the lexer plus state of the parser when shared by all
  50.    functions */
  51. typedef struct LexState {
  52.   int current;  /* current character (charint) */
  53.   int linenumber;  /* input line counter */
  54.   int lastline;  /* line of last token `consumed' */
  55.   Token t;  /* current token */
  56.   Token lookahead;  /* look ahead token */
  57.   struct FuncState *fs;  /* current function (parser) */
  58.   struct lua_State *L;
  59.   ZIO *z;  /* input stream */
  60.   Mbuffer *buff;  /* buffer for tokens */
  61.   struct Dyndata *dyd;  /* dynamic structures used by the parser */
  62.   TString *source;  /* current source name */
  63.   TString *envn;  /* environment variable name */
  64.   char decpoint;  /* locale decimal point */
  65. } LexState;
  66.  
  67.  
  68. LUAI_FUNC void luaX_init (lua_State *L);
  69. LUAI_FUNC void luaX_setinput (lua_State *L, LexState *ls, ZIO *z,
  70.                               TString *source, int firstchar);
  71. LUAI_FUNC TString *luaX_newstring (LexState *ls, const char *str, size_t l);
  72. LUAI_FUNC void luaX_next (LexState *ls);
  73. LUAI_FUNC int luaX_lookahead (LexState *ls);
  74. LUAI_FUNC l_noret luaX_syntaxerror (LexState *ls, const char *s);
  75. LUAI_FUNC const char *luaX_token2str (LexState *ls, int token);
  76.  
  77.  
  78. #endif
  79.