xref: /freebsd/contrib/lua/src/llex.h (revision 8ddb146abcdf061be9f2c0db7e391697dafad85c)
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
92