// Copyright (c) 2008, Rodrigo Braz Monteiro
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   * Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//   * Neither the name of the Aegisub Group nor the names of its contributors
//     may be used to endorse or promote products derived from this software
//     without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// -----------------------------------------------------------------------------
//
// AEGISUB
//
// Website: http://aegisub.cellosoft.com
// Contact: mailto:zeratul@cellosoft.com
//


// Headers
#include "text_reader_cache.h"
using namespace Athenasub;


Athenasub::TextReaderCache::TextReaderCache(shared_ptr<TextReader> src)
: source(src)
{
	bufferPos = 0;
}

String TextReaderCache::ReadLineFromFile()
{
	if (bufferPos == buffer.size()) {
		LoadMore(10);
	}
	if (bufferPos == buffer.size()) {
		return "";
	}
	return buffer[bufferPos++];
}

bool TextReaderCache::HasMoreLines()
{
	if (bufferPos != buffer.size())
		return true;
	else
		return CanLoadMore();
}

void TextReaderCache::Rewind()
{
	bufferPos = 0;
}

void Athenasub::TextReaderCache::LoadMore(int n)
{
	for (int i=0;i<n;i++) {
		if (CanLoadMore())
			buffer.push_back(source->ReadLineFromFile());
		else
			return;
	}
}

bool Athenasub::TextReaderCache::CanLoadMore()
{
	return source->HasMoreLines();
}