lua/src/llex.h

   1 /*
   2 ** $Id: llex.h,v 1.58 2006/03/23 18:23:32 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