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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__
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