client/deps/liblua/llex.h

   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