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*/
26enum 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
43typedef union {
44  lua_Number r;
45  lua_Integer i;
46  TString *ts;
47} SemInfo;  /* semantics information */
48
49
50typedef 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 */
58typedef 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
75LUAI_FUNC void luaX_init (lua_State *L);
76LUAI_FUNC void luaX_setinput (lua_State *L, LexState *ls, ZIO *z,
77                              TString *source, int firstchar);
78LUAI_FUNC TString *luaX_newstring (LexState *ls, const char *str, size_t l);
79LUAI_FUNC void luaX_next (LexState *ls);
80LUAI_FUNC int luaX_lookahead (LexState *ls);
81LUAI_FUNC l_noret luaX_syntaxerror (LexState *ls, const char *s);
82LUAI_FUNC const char *luaX_token2str (LexState *ls, int token);
83
84
85#endif
86