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  1. /*
  2. ** $Id: llex.h $
  3. ** Lexical Analyzer
  4. ** See Copyright Notice in lua.h
  5. */
  6.  
  7. #ifndef llex_h
  8. #define llex_h
  9.  
  10. #include <limits.h>
  11.  
  12. #include "lobject.h"
  13. #include "lzio.h"
  14.  
  15.  
  16. /*
  17. ** Single-char tokens (terminal symbols) are represented by their own
  18. ** numeric code. Other tokens start at the following value.
  19. */
  20. #define FIRST_RESERVED  (UCHAR_MAX + 1)
  21.  
  22.  
  23. #if !defined(LUA_ENV)
  24. #define LUA_ENV         "_ENV"
  25. #endif
  26.  
  27.  
  28. /*
  29. * WARNING: if you change the order of this enumeration,
  30. * grep "ORDER RESERVED"
  31. */
  32. enum RESERVED {
  33.   /* terminal symbols denoted by reserved words */
  34.   TK_AND = FIRST_RESERVED, TK_BREAK,
  35.   TK_DO, TK_ELSE, TK_ELSEIF, TK_END, TK_FALSE, TK_FOR, TK_FUNCTION,
  36.   TK_GOTO, TK_IF, TK_IN, TK_LOCAL, TK_NIL, TK_NOT, TK_OR, TK_REPEAT,
  37.   TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE,
  38.   /* other terminal symbols */
  39.   TK_IDIV, TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE,
  40.   TK_SHL, TK_SHR,
  41.   TK_DBCOLON, TK_EOS,
  42.   TK_FLT, TK_INT, TK_NAME, TK_STRING
  43. };
  44.  
  45. /* number of reserved words */
  46. #define NUM_RESERVED    (cast_int(TK_WHILE-FIRST_RESERVED + 1))
  47.  
  48.  
  49. typedef union {
  50.   lua_Number r;
  51.   lua_Integer i;
  52.   TString *ts;
  53. } SemInfo;  /* semantics information */
  54.  
  55.  
  56. typedef struct Token {
  57.   int token;
  58.   SemInfo seminfo;
  59. } Token;
  60.  
  61.  
  62. /* state of the lexer plus state of the parser when shared by all
  63.    functions */
  64. typedef struct LexState {
  65.   int current;  /* current character (charint) */
  66.   int linenumber;  /* input line counter */
  67.   int lastline;  /* line of last token 'consumed' */
  68.   Token t;  /* current token */
  69.   Token lookahead;  /* look ahead token */
  70.   struct FuncState *fs;  /* current function (parser) */
  71.   struct lua_State *L;
  72.   ZIO *z;  /* input stream */
  73.   Mbuffer *buff;  /* buffer for tokens */
  74.   Table *h;  /* to avoid collection/reuse strings */
  75.   struct Dyndata *dyd;  /* dynamic structures used by the parser */
  76.   TString *source;  /* current source name */
  77.   TString *envn;  /* environment variable name */
  78. } LexState;
  79.  
  80.  
  81. LUAI_FUNC void luaX_init (lua_State *L);
  82. LUAI_FUNC void luaX_setinput (lua_State *L, LexState *ls, ZIO *z,
  83.                               TString *source, int firstchar);
  84. LUAI_FUNC TString *luaX_newstring (LexState *ls, const char *str, size_t l);
  85. LUAI_FUNC void luaX_next (LexState *ls);
  86. LUAI_FUNC int luaX_lookahead (LexState *ls);
  87. LUAI_FUNC l_noret luaX_syntaxerror (LexState *ls, const char *s);
  88. LUAI_FUNC const char *luaX_token2str (LexState *ls, int token);
  89.  
  90.  
  91. #endif
  92.