1 /*
2 ** $Id: llex.h,v 1.1 2006/02/02 13:35:29 cavac 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_NAME, TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE, TK_NUMBER,
32   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 typedef union {
40   lua_Number r;
41   TString *ts;
42 } SemInfo;  /* semantics information */
43 
44 
45 typedef struct Token {
46   int token;
47   SemInfo seminfo;
48 } Token;
49 
50 
51 typedef struct LexState {
52   int current;  /* current character (charint) */
53   int linenumber;  /* input line counter */
54   int lastline;  /* line of last token `consumed' */
55   Token t;  /* current token */
56   Token lookahead;  /* look ahead token */
57   struct FuncState *fs;  /* `FuncState' is private to the parser */
58   struct lua_State *L;
59   ZIO *z;  /* input stream */
60   Mbuffer *buff;  /* buffer for tokens */
61   TString *source;  /* current source name */
62   int nestlevel;  /* level of nested non-terminals */
63 } LexState;
64 
65 
66 void luaX_init (lua_State *L);
67 void luaX_setinput (lua_State *L, LexState *LS, ZIO *z, TString *source);
68 int luaX_lex (LexState *LS, SemInfo *seminfo);
69 void luaX_checklimit (LexState *ls, int val, int limit, const char *msg);
70 void luaX_syntaxerror (LexState *ls, const char *s);
71 void luaX_errorline (LexState *ls, const char *s, const char *token, int line);
72 const char *luaX_token2str (LexState *ls, int token);
73 
74 
75 #endif
76