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diff --git a/lib/antlr/antlr/LexerSharedInputState.h b/lib/antlr/antlr/LexerSharedInputState.h
new file mode 100644
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+++ b/lib/antlr/antlr/LexerSharedInputState.h
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+#ifndef INC_LexerSharedInputState_h__
+#define INC_LexerSharedInputState_h__
+
+/* ANTLR Translator Generator
+ * Project led by Terence Parr at http://www.jGuru.com
+ * Software rights: http://www.antlr.org/license.html
+ *
+ * $Id$
+ */
+
+#include <antlr/config.h>
+#include <antlr/InputBuffer.h>
+#include <antlr/RefCount.h>
+#include <antlr/CharBuffer.h>
+#include <string>
+
+#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
+namespace antlr {
+#endif
+
+/** This object contains the data associated with an
+ *  input stream of characters.  Multiple lexers
+ *  share a single LexerSharedInputState to lex
+ *  the same input stream.
+ */
+class ANTLR_API LexerInputState {
+public:
+	/** Construct a new LexerInputState
+	 * @param inbuf the InputBuffer to read from. The object is deleted together
+	 * with the LexerInputState object.
+	 */
+	LexerInputState(InputBuffer* inbuf)
+	: column(1)
+	, line(1)
+	, tokenStartColumn(1)
+	, tokenStartLine(1)
+	, guessing(0)
+	, filename("")
+	, input(inbuf)
+	, inputResponsible(true)
+	{
+	}
+
+	/** Construct a new LexerInputState
+	 * @param inbuf the InputBuffer to read from.
+	 */
+	LexerInputState(InputBuffer& inbuf)
+	: column(1)
+	, line(1)
+	, tokenStartColumn(1)
+	, tokenStartLine(1)
+	, guessing(0)
+	, filename("")
+	, input(&inbuf)
+	, inputResponsible(false)
+	{
+	}
+
+	/** Construct a new LexerInputState
+	 * @param in an istream to read from.
+	 * @see antlr.CharBuffer
+	 */
+	LexerInputState(ANTLR_USE_NAMESPACE(std)istream& in)
+	: column(1)
+	, line(1)
+	, tokenStartColumn(1)
+	, tokenStartLine(1)
+	, guessing(0)
+	, filename("")
+	, input(new CharBuffer(in))
+	, inputResponsible(true)
+	{
+	}
+
+	/** Reset the LexerInputState with a specified stream and filename.
+	 * This method is a hack, dunno what I was thinking when I added it.
+	 * This should actually be done in a subclass.
+	 * @deprecated
+	 */
+	virtual void initialize( ANTLR_USE_NAMESPACE(std)istream& in, const char* file = "" )
+	{
+		column = 1;
+		line = 1;
+		tokenStartColumn = 1;
+		tokenStartLine = 1;
+		guessing = 0;
+		filename = file;
+
+		if( input && inputResponsible )
+			delete input;
+
+		input = new CharBuffer(in);
+		inputResponsible = true;
+	}
+
+	/** Reset the LexerInputState to initial state.
+	 * The underlying InputBuffer is also reset.
+	 */
+	virtual void reset( void )
+	{
+		column = 1;
+		line = 1;
+		tokenStartColumn = 1;
+		tokenStartLine = 1;
+		guessing = 0;
+		input->reset();
+	}
+
+	/** Set the file position of the SharedLexerInputState.
+	 * @param line_ line number to be set
+	 * @param column_ column number to be set
+	 */
+	void setPosition( int line_, int column_ )
+	{
+		line = line_;
+		column = column_;
+	}
+
+	virtual ~LexerInputState()
+	{
+		if (inputResponsible)
+			delete input;
+	}
+
+	int column;
+	int line;
+	int tokenStartColumn;
+	int tokenStartLine;
+	int guessing;
+	/** What file (if known) caused the problem? */
+	ANTLR_USE_NAMESPACE(std)string filename;
+	InputBuffer& getInput();
+private:
+	/// Input buffer we use
+	InputBuffer* input;
+	/// Who is responsible for cleaning up the InputBuffer?
+	bool inputResponsible;
+
+	// we don't want these:
+	LexerInputState(const LexerInputState&);
+	LexerInputState& operator=(const LexerInputState&);
+};
+
+inline InputBuffer& LexerInputState::getInput()
+{
+	return *input;
+}
+
+/// A reference counted LexerInputState object
+typedef RefCount<LexerInputState> LexerSharedInputState;
+
+#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
+}
+#endif
+
+#endif //INC_LexerSharedInputState_h__