1#ifndef INC_ParserSharedInputState_hpp__
2#define INC_ParserSharedInputState_hpp__
3
4/* ANTLR Translator Generator
5 * Project led by Terence Parr at http://www.jGuru.com
6 * Software rights: http://www.antlr.org/license.html
7 *
8 * $Id: //depot/code/org.antlr/release/antlr-2.7.7/lib/cpp/antlr/ParserSharedInputState.hpp#2 $
9 */
10
11#include <antlr/config.hpp>
12#include <antlr/TokenBuffer.hpp>
13#include <antlr/RefCount.hpp>
14#include <string>
15
16#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
17namespace antlr {
18#endif
19
20/** This object contains the data associated with an
21 * input stream of tokens.  Multiple parsers
22 * share a single ParserSharedInputState to parse
23 * the same stream of tokens.
24 */
25class ANTLR_API ParserInputState {
26public:
27	/** Construct a new ParserInputState
28	 * @param in the TokenBuffer to read from. The object is deleted together
29	 * with the ParserInputState object.
30	 */
31	ParserInputState( TokenBuffer* in )
32	: guessing(0)
33	, filename()
34	, input(in)
35	, inputResponsible(true)
36	{
37	}
38	/** Construct a new ParserInputState
39	 * @param in the TokenBuffer to read from.
40	 */
41	ParserInputState( TokenBuffer& in )
42	: guessing(0)
43	, filename("")
44	, input(&in)
45	, inputResponsible(false)
46	{
47	}
48
49	virtual ~ParserInputState()
50	{
51		if (inputResponsible)
52			delete input;
53	}
54
55	TokenBuffer& getInput( void )
56	{
57		return *input;
58	}
59
60	/// Reset the ParserInputState and the underlying TokenBuffer
61	void reset( void )
62	{
63		input->reset();
64		guessing = 0;
65	}
66
67public:
68	/** Are we guessing (guessing>0)? */
69	int guessing;
70	/** What file (if known) caused the problem?
71	 * @todo wrap this one..
72	 */
73	ANTLR_USE_NAMESPACE(std)string filename;
74private:
75	/** Where to get token objects */
76	TokenBuffer* input;
77	/// Do we need to free the TokenBuffer or is it owned by another..
78	bool inputResponsible;
79
80	// we don't want these:
81	ParserInputState(const ParserInputState&);
82	ParserInputState& operator=(const ParserInputState&);
83};
84
85/// A reference counted ParserInputState
86typedef RefCount<ParserInputState> ParserSharedInputState;
87
88#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
89}
90#endif
91
92#endif //INC_ParserSharedInputState_hpp__
93