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82 lines
1.7 KiB
82 lines
1.7 KiB
/* ANTLR Translator Generator
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* Project led by Terence Parr at http://www.jGuru.com
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* Software rights: http://www.antlr.org/license.html
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*
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* $Id$
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*/
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#include "antlr/config.h"
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#include "antlr/InputBuffer.h"
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#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
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namespace antlr {
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#endif
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/** Ensure that the character buffer is sufficiently full */
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void InputBuffer::fill(unsigned int amount)
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{
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syncConsume();
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// Fill the buffer sufficiently to hold needed characters
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while (queue.entries() < amount + markerOffset)
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{
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// Append the next character
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queue.append(getChar());
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}
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}
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/** get the current lookahead characters as a string
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* @warning it may treat 0 and EOF values wrong
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*/
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ANTLR_USE_NAMESPACE(std)string InputBuffer::getLAChars( void ) const
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{
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ANTLR_USE_NAMESPACE(std)string ret;
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for(unsigned int i = markerOffset; i < queue.entries(); i++)
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ret += queue.elementAt(i);
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return ret;
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}
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/** get the current marked characters as a string
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* @warning it may treat 0 and EOF values wrong
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*/
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ANTLR_USE_NAMESPACE(std)string InputBuffer::getMarkedChars( void ) const
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{
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ANTLR_USE_NAMESPACE(std)string ret;
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for(unsigned int i = 0; i < markerOffset; i++)
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ret += queue.elementAt(i);
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return ret;
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}
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/** Return an integer marker that can be used to rewind the buffer to
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* its current state.
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*/
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unsigned int InputBuffer::mark()
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{
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syncConsume();
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nMarkers++;
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return markerOffset;
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}
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/** Rewind the character buffer to a marker.
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* @param mark Marker returned previously from mark()
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*/
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void InputBuffer::rewind(unsigned int mark)
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{
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syncConsume();
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markerOffset = mark;
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nMarkers--;
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}
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unsigned int InputBuffer::entries() const
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{
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//assert(queue.entries() >= markerOffset);
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return queue.entries() - markerOffset;
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}
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#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
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}
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#endif
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