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