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cachereader.cpp
133 lines (105 loc) · 3.4 KB
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cachereader.cpp
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/*
This file is part of the KDE Help Center
Copyright (c) 2016 Pino Toscano <pino@kde.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA
*/
#include "cachereader.h"
#include <QLoggingCategory>
#include <QStack>
#include <QTextStream>
#include <KCompressionDevice>
#include <algorithm>
namespace {
Q_LOGGING_CATEGORY( LOG, "org.kde.khelpcenter.xapian.cachereader", QtWarningMsg )
}
static bool readAll( const QString& file, QString* data )
{
KCompressionDevice dev( file, KCompressionDevice::BZip2 );
if ( !dev.open( QIODevice::ReadOnly ) ) {
qCWarning(LOG) << "cannot open" << file << ":" << dev.errorString();
return false;
}
*data = QString::fromUtf8( dev.readAll() );
return true;
}
CacheReader::CacheReader()
{
}
CacheReader::~CacheReader()
{
}
bool CacheReader::parse( const QString& file )
{
mText.clear();
mRanges.clear();
if ( !readAll( file, &mText ) ) {
return false;
}
const int length = mText.length();
static const QString patternStart = QStringLiteral( "<FILENAME filename=\"" );
static const QString patternEnd = QStringLiteral( "</FILENAME>" );
QStack<QString> stack;
int index = 0;
while ( index < length ) {
int start = mText.indexOf( patternStart, index );
int end = mText.indexOf( patternEnd, index );
if ( start >= 0 && start < end ) {
// new document
const int quote = mText.indexOf( QLatin1Char('"'), start + patternStart.length() );
const QString name = mText.mid( start + patternStart.length(), quote - ( start + patternStart.length() ) );
if ( stack.isEmpty() ) {
} else {
if ( start > index ) {
mRanges.insert( stack.top(), qMakePair( index, start - 1 ) );
}
}
index = quote + 2;
stack.push( name );
} else if ( end >= 0 ) {
// end of current document
Q_ASSERT( !stack.isEmpty() );
mRanges.insert( stack.top(), qMakePair( index, end - 1 ) );
index = end + patternEnd.length();
stack.pop();
} else {
break;
}
}
Q_ASSERT( stack.isEmpty() );
return true;
}
QSet<QString> CacheReader::documents() const
{
return QSet<QString>::fromList( mRanges.uniqueKeys() );
}
QByteArray CacheReader::document( const QString& id ) const
{
QList<Range> docRanges = mRanges.values( id );
if ( docRanges.isEmpty() ) {
return QByteArray();
}
QByteArray doc;
if ( docRanges.count() == 1 ) {
const Range range = docRanges.first();
doc = mText.midRef( range.first, range.second - range.first + 1 ).toUtf8();
} else {
std::reverse( docRanges.begin(), docRanges.end() );
QTextStream stream( &doc );
stream.setCodec( "UTF-8" );
Q_FOREACH ( const Range &range, docRanges ) {
stream << mText.mid( range.first, range.second - range.first + 1 );
}
}
return doc;
}