mudgangster

Tiny, scriptable MUD client
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llex.h (2275B)

      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