1 | /* |
---|
2 | ** $Id: llex.h,v 1.47 2003/02/28 17:19:47 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 | /* 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 |
---|