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  1. /*
  2. ** $Id: llex.h,v 1.79.1.1 2017/04/19 17:20:42 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. #if !defined(LUA_ENV)
  18. #define LUA_ENV         "_ENV"
  19. #endif
  20.  
  21.  
  22. /*
  23. * WARNING: if you change the order of this enumeration,
  24. * grep "ORDER RESERVED"
  25. */
  26. enum RESERVED {
  27.   /* terminal symbols denoted by reserved words */
  28.   TK_AND = FIRST_RESERVED, TK_BREAK,
  29.   TK_DO, TK_ELSE, TK_ELSEIF, TK_END, TK_FALSE, TK_FOR, TK_FUNCTION,
  30.   TK_GOTO, TK_IF, TK_IN, TK_LOCAL, TK_NIL, TK_NOT, TK_OR, TK_REPEAT,
  31.   TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE,
  32.   /* other terminal symbols */
  33.   TK_IDIV, TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE,
  34.   TK_SHL, TK_SHR,
  35.   TK_DBCOLON, TK_EOS,
  36.   TK_FLT, TK_INT, TK_NAME, TK_STRING
  37. };
  38.  
  39. /* number of reserved words */
  40. #define NUM_RESERVED    (cast(int, TK_WHILE-FIRST_RESERVED+1))
  41.  
  42.  
  43. typedef union {
  44.   lua_Number r;
  45.   lua_Integer i;
  46.   TString *ts;
  47. } SemInfo;  /* semantics information */
  48.  
  49.  
  50. typedef struct Token {
  51.   int token;
  52.   SemInfo seminfo;
  53. } Token;
  54.  
  55.  
  56. /* state of the lexer plus state of the parser when shared by all
  57.    functions */
  58. typedef struct LexState {
  59.   int current;  /* current character (charint) */
  60.   int linenumber;  /* input line counter */
  61.   int lastline;  /* line of last token 'consumed' */
  62.   Token t;  /* current token */
  63.   Token lookahead;  /* look ahead token */
  64.   struct FuncState *fs;  /* current function (parser) */
  65.   struct lua_State *L;
  66.   ZIO *z;  /* input stream */
  67.   Mbuffer *buff;  /* buffer for tokens */
  68.   Table *h;  /* to avoid collection/reuse strings */
  69.   struct Dyndata *dyd;  /* dynamic structures used by the parser */
  70.   TString *source;  /* current source name */
  71.   TString *envn;  /* environment variable name */
  72. } LexState;
  73.  
  74.  
  75. LUAI_FUNC void luaX_init (lua_State *L);
  76. LUAI_FUNC void luaX_setinput (lua_State *L, LexState *ls, ZIO *z,
  77.                               TString *source, int firstchar);
  78. LUAI_FUNC TString *luaX_newstring (LexState *ls, const char *str, size_t l);
  79. LUAI_FUNC void luaX_next (LexState *ls);
  80. LUAI_FUNC int luaX_lookahead (LexState *ls);
  81. LUAI_FUNC l_noret luaX_syntaxerror (LexState *ls, const char *s);
  82. LUAI_FUNC const char *luaX_token2str (LexState *ls, int token);
  83.  
  84.  
  85. #endif
  86.