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  1. /*
  2. ** $Id: llex.h,v 1.58.1.1 2007/12/27 13:02:25 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. /* maximum length of a reserved word */
  17. #define TOKEN_LEN       (sizeof("function")/sizeof(char))
  18.  
  19.  
  20. /*
  21. * WARNING: if you change the order of this enumeration,
  22. * grep "ORDER RESERVED"
  23. */
  24. enum RESERVED {
  25.   /* terminal symbols denoted by reserved words */
  26.   TK_AND = FIRST_RESERVED, TK_BREAK,
  27.   TK_DO, TK_ELSE, TK_ELSEIF, TK_END, TK_FALSE, TK_FOR, TK_FUNCTION,
  28.   TK_IF, TK_IN, TK_LOCAL, TK_NIL, TK_NOT, TK_OR, TK_REPEAT,
  29.   TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE,
  30.   /* other terminal symbols */
  31.   TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE, TK_NUMBER,
  32.   TK_NAME, TK_STRING, TK_EOS
  33. };
  34.  
  35. /* number of reserved words */
  36. #define NUM_RESERVED    (cast(int, TK_WHILE-FIRST_RESERVED+1))
  37.  
  38.  
  39. /* array with token `names' */
  40. LUAI_DATA const char *const luaX_tokens [];
  41.  
  42.  
  43. typedef union {
  44.   lua_Number r;
  45.   TString *ts;
  46. } SemInfo;  /* semantics information */
  47.  
  48.  
  49. typedef struct Token {
  50.   int token;
  51.   SemInfo seminfo;
  52. } Token;
  53.  
  54.  
  55. typedef struct LexState {
  56.   int current;  /* current character (charint) */
  57.   int linenumber;  /* input line counter */
  58.   int lastline;  /* line of last token `consumed' */
  59.   Token t;  /* current token */
  60.   Token lookahead;  /* look ahead token */
  61.   struct FuncState *fs;  /* `FuncState' is private to the parser */
  62.   struct lua_State *L;
  63.   ZIO *z;  /* input stream */
  64.   Mbuffer *buff;  /* buffer for tokens */
  65.   TString *source;  /* current source name */
  66.   char decpoint;  /* locale decimal point */
  67. } LexState;
  68.  
  69.  
  70. LUAI_FUNC void luaX_init (lua_State *L);
  71. LUAI_FUNC void luaX_setinput (lua_State *L, LexState *ls, ZIO *z,
  72.                               TString *source);
  73. LUAI_FUNC TString *luaX_newstring (LexState *ls, const char *str, size_t l);
  74. LUAI_FUNC void luaX_next (LexState *ls);
  75. LUAI_FUNC void luaX_lookahead (LexState *ls);
  76. LUAI_FUNC void luaX_lexerror (LexState *ls, const char *msg, int token);
  77. LUAI_FUNC void luaX_syntaxerror (LexState *ls, const char *s);
  78. LUAI_FUNC const char *luaX_token2str (LexState *ls, int token);
  79.  
  80.  
  81. #endif
  82.