external/mit/lua/dist/src/llex.h

   1 /*      $NetBSD: llex.h,v 1.3 2015/02/02 14:03:05 lneto Exp $   */
   2
   3 /*
   4 ** Id: llex.h,v 1.78 2014/10/29 15:38:24 roberto Exp
   5 ** Lexical Analyzer
   6 ** See Copyright Notice in lua.h
   7 */
   8
   9 #ifndef llex_h
  10 #define llex_h
  11
  12 #include "lobject.h"
  13 #include "lzio.h"
  14
  15
  16 #define FIRST_RESERVED  257
  17
  18
  19 #if !defined(LUA_ENV)
  20 #define LUA_ENV         "_ENV"
  21 #endif
  22
  23
  24 /*
  25 * WARNING: if you change the order of this enumeration,
  26 * grep "ORDER RESERVED"
  27 */
  28 enum RESERVED {
  29   /* terminal symbols denoted by reserved words */
  30   TK_AND = FIRST_RESERVED, TK_BREAK,
  31   TK_DO, TK_ELSE, TK_ELSEIF, TK_END, TK_FALSE, TK_FOR, TK_FUNCTION,
  32   TK_GOTO, TK_IF, TK_IN, TK_LOCAL, TK_NIL, TK_NOT, TK_OR, TK_REPEAT,
  33   TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE,
  34   /* other terminal symbols */
  35   TK_IDIV, TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE,
  36   TK_SHL, TK_SHR,
  37   TK_DBCOLON, TK_EOS,
  38 #ifndef _KERNEL
  39   TK_FLT, TK_INT, TK_NAME, TK_STRING
  40 #else /* _KERNEL */
  41   TK_INT, TK_NAME, TK_STRING
  42 #endif
  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   char decpoint;  /* locale decimal point */
  79 } LexState;
  80
  81
  82 LUAI_FUNC void luaX_init (lua_State *L);
  83 LUAI_FUNC void luaX_setinput (lua_State *L, LexState *ls, ZIO *z,
  84                               TString *source, int firstchar);
  85 LUAI_FUNC TString *luaX_newstring (LexState *ls, const char *str, size_t l);
  86 LUAI_FUNC void luaX_next (LexState *ls);
  87 LUAI_FUNC int luaX_lookahead (LexState *ls);
  88 LUAI_FUNC l_noret luaX_syntaxerror (LexState *ls, const char *s);
  89 LUAI_FUNC const char *luaX_token2str (LexState *ls, int token);
  90
  91
  92 #endif