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/* 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"
#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
namespace antlr {
#endif
/** Ensure that the character buffer is sufficiently full */
void InputBuffer::fill(unsigned int amount)
{
syncConsume();
// Fill the buffer sufficiently to hold needed characters
while (queue.entries() < amount + markerOffset)
{
// Append the next character
queue.append(getChar());
}
}
/** get the current lookahead characters as a string
* @warning it may treat 0 and EOF values wrong
*/
ANTLR_USE_NAMESPACE(std)string InputBuffer::getLAChars( void ) const
{
ANTLR_USE_NAMESPACE(std)string ret;
for(unsigned int i = markerOffset; i < queue.entries(); i++)
ret += queue.elementAt(i);
return ret;
}
/** get the current marked characters as a string
* @warning it may treat 0 and EOF values wrong
*/
ANTLR_USE_NAMESPACE(std)string InputBuffer::getMarkedChars( void ) const
{
ANTLR_USE_NAMESPACE(std)string ret;
for(unsigned int i = 0; i < markerOffset; i++)
ret += queue.elementAt(i);
return ret;
}
/** Return an integer marker that can be used to rewind the buffer to
* its current state.
*/
unsigned int InputBuffer::mark()
{
syncConsume();
nMarkers++;
return markerOffset;
}
/** Rewind the character buffer to a marker.
* @param mark Marker returned previously from mark()
*/
void InputBuffer::rewind(unsigned int mark)
{
syncConsume();
markerOffset = mark;
nMarkers--;
}
unsigned int InputBuffer::entries() const
{
//assert(queue.entries() >= markerOffset);
return queue.entries() - markerOffset;
}
#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
}
#endif
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