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qt3/tools/assistant/index.cpp

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/**********************************************************************
** Copyright (C) 2000-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the Qt Assistant.
**
** This file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the files LICENSE.GPL2
** and LICENSE.GPL3 included in the packaging of this file.
** Alternatively you may (at your option) use any later version
** of the GNU General Public License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free Qt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with
** the Software.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/
#include "index.h"
#include <qfile.h>
#include <qdir.h>
#include <qstringlist.h>
#include <qdict.h>
#include <qapplication.h>
#include <ctype.h>
int TermList::compareItems( QPtrCollection::Item i1, QPtrCollection::Item i2 )
{
if( ( (Term*)i1 )->frequency == ( (Term*)i2 )->frequency )
return 0;
if( ( (Term*)i1 )->frequency < ( (Term*)i2 )->frequency )
return -1;
return 1;
}
QDataStream &operator>>( QDataStream &s, Document &l )
{
s >> l.docNumber;
s >> l.frequency;
return s;
}
QDataStream &operator<<( QDataStream &s, const Document &l )
{
s << (Q_INT16)l.docNumber;
s << (Q_INT16)l.frequency;
return s;
}
Index::Index( const QString &dp, const QString &hp )
: QObject( 0, 0 ), dict( 8999 ), docPath( dp )
{
alreadyHaveDocList = FALSE;
lastWindowClosed = FALSE;
connect( qApp, SIGNAL( lastWindowClosed() ),
this, SLOT( setLastWinClosed() ) );
}
Index::Index( const QStringList &dl, const QString &hp )
: QObject( 0, 0 ), dict( 8999 )
{
docList = dl;
alreadyHaveDocList = TRUE;
lastWindowClosed = FALSE;
connect( qApp, SIGNAL( lastWindowClosed() ),
this, SLOT( setLastWinClosed() ) );
}
void Index::setLastWinClosed()
{
lastWindowClosed = TRUE;
}
void Index::setDictionaryFile( const QString &f )
{
dictFile = f;
}
void Index::setDocListFile( const QString &f )
{
docListFile = f;
}
void Index::setDocList( const QStringList &lst )
{
docList = lst;
}
int Index::makeIndex()
{
if ( !alreadyHaveDocList )
setupDocumentList();
if ( docList.isEmpty() )
return 1;
QStringList::Iterator it = docList.begin();
int steps = docList.count() / 100;
if ( !steps )
steps++;
int prog = 0;
for ( int i = 0; it != docList.end(); ++it, ++i ) {
if ( lastWindowClosed ) {
return -1;
}
parseDocument( *it, i );
if ( i%steps == 0 ) {
prog++;
emit indexingProgress( prog );
}
}
return 0;
}
void Index::setupDocumentList()
{
QDir d( docPath );
QStringList lst = d.entryList( "*.html" );
QStringList::ConstIterator it = lst.begin();
for ( ; it != lst.end(); ++it )
docList.append( docPath + "/" + *it );
}
void Index::insertInDict( const QString &str, int docNum )
{
if ( strcmp( str, "amp" ) == 0 || strcmp( str, "nbsp" ) == 0 )
return;
Entry *e = 0;
if ( dict.count() )
e = dict[ str ];
if ( e ) {
if ( e->documents.first().docNumber != docNum )
e->documents.prepend( Document( docNum, 1 ) );
else
e->documents.first().frequency++;
} else {
dict.insert( str, new Entry( docNum ) );
}
}
void Index::parseDocument( const QString &filename, int docNum )
{
QFile file( filename );
if ( !file.open( IO_ReadOnly ) ) {
qWarning( "can not open file " + filename );
return;
}
QTextStream s( &file );
QString text = s.read();
if (text.isNull())
return;
bool valid = TRUE;
const QChar *buf = text.unicode();
QChar str[64];
QChar c = buf[0];
int j = 0;
int i = 0;
while ( (uint)j < text.length() ) {
if ( c == '<' || c == '&' ) {
valid = FALSE;
if ( i > 1 )
insertInDict( QString(str,i), docNum );
i = 0;
c = buf[++j];
continue;
}
if ( ( c == '>' || c == ';' ) && !valid ) {
valid = TRUE;
c = buf[++j];
continue;
}
if ( !valid ) {
c = buf[++j];
continue;
}
if ( ( c.isLetterOrNumber() || c == '_' ) && i < 63 ) {
str[i] = c.lower();
++i;
} else {
if ( i > 1 )
insertInDict( QString(str,i), docNum );
i = 0;
}
c = buf[++j];
}
if ( i > 1 )
insertInDict( QString(str,i), docNum );
file.close();
}
void Index::writeDict()
{
QDictIterator<Entry> it( dict );
QFile f( dictFile );
if ( !f.open( IO_WriteOnly ) )
return;
QDataStream s( &f );
for( ; it.current(); ++it ) {
Entry *e = it.current();
s << it.currentKey();
s << e->documents;
}
f.close();
writeDocumentList();
}
void Index::writeDocumentList()
{
QFile f( docListFile );
if ( !f.open( IO_WriteOnly ) )
return;
QDataStream s( &f );
s << docList;
}
void Index::readDict()
{
QFile f( dictFile );
if ( !f.open( IO_ReadOnly ) )
return;
dict.clear();
QDataStream s( &f );
QString key;
QValueList<Document> docs;
while ( !s.atEnd() ) {
s >> key;
s >> docs;
dict.insert( key, new Entry( docs ) );
}
f.close();
readDocumentList();
}
void Index::readDocumentList()
{
QFile f( docListFile );
if ( !f.open( IO_ReadOnly ) )
return;
QDataStream s( &f );
s >> docList;
}
QStringList Index::query( const QStringList &terms, const QStringList &termSeq, const QStringList &seqWords )
{
TermList termList;
QStringList::ConstIterator it = terms.begin();
for ( it = terms.begin(); it != terms.end(); ++it ) {
Entry *e = 0;
if ( (*it).contains( '*' ) ) {
QValueList<Document> wcts = setupDummyTerm( getWildcardTerms( *it ) );
termList.append( new Term( "dummy", wcts.count(), wcts ) );
} else if ( dict[ *it ] ) {
e = dict[ *it ];
termList.append( new Term( *it, e->documents.count(), e->documents ) );
} else {
return QStringList();
}
}
termList.sort();
Term *minTerm = termList.first();
if ( !termList.count() )
return QStringList();
termList.removeFirst();
QValueList<Document> minDocs = minTerm->documents;
QValueList<Document>::iterator C;
QValueList<Document>::ConstIterator It;
Term *t = termList.first();
for ( ; t; t = termList.next() ) {
QValueList<Document> docs = t->documents;
C = minDocs.begin();
while ( C != minDocs.end() ) {
bool found = FALSE;
for ( It = docs.begin(); It != docs.end(); ++It ) {
if ( (*C).docNumber == (*It).docNumber ) {
(*C).frequency += (*It).frequency;
found = TRUE;
break;
}
}
if ( !found )
C = minDocs.remove( C );
else
++C;
}
}
QStringList results;
qHeapSort( minDocs );
if ( termSeq.isEmpty() ) {
for ( C = minDocs.begin(); C != minDocs.end(); ++C )
results << docList[ (int)(*C).docNumber ];
return results;
}
QString fileName;
for ( C = minDocs.begin(); C != minDocs.end(); ++C ) {
fileName = docList[ (int)(*C).docNumber ];
if ( searchForPattern( termSeq, seqWords, fileName ) )
results << fileName;
}
return results;
}
QString Index::getDocumentTitle( const QString &fileName )
{
QFile file( fileName );
if ( !file.open( IO_ReadOnly ) ) {
qWarning( "cannot open file " + fileName );
return fileName;
}
QTextStream s( &file );
QString text = s.read();
int start = text.find( "<title>", 0, FALSE ) + 7;
int end = text.find( "</title>", 0, FALSE );
QString title = ( end - start <= 0 ? tr("Untitled") : text.mid( start, end - start ) );
return title;
}
QStringList Index::getWildcardTerms( const QString &term )
{
QStringList lst;
QStringList terms = split( term );
QValueList<QString>::iterator iter;
QDictIterator<Entry> it( dict );
for( ; it.current(); ++it ) {
int index = 0;
bool found = FALSE;
QString text( it.currentKey() );
for ( iter = terms.begin(); iter != terms.end(); ++iter ) {
if ( *iter == "*" ) {
found = TRUE;
continue;
}
if ( iter == terms.begin() && (*iter)[0] != text[0] ) {
found = FALSE;
break;
}
index = text.find( *iter, index );
if ( *iter == terms.last() && index != (int)text.length()-1 ) {
index = text.findRev( *iter );
if ( index != (int)text.length() - (int)(*iter).length() ) {
found = FALSE;
break;
}
}
if ( index != -1 ) {
found = TRUE;
index += (*iter).length();
continue;
} else {
found = FALSE;
break;
}
}
if ( found )
lst << text;
}
return lst;
}
QStringList Index::split( const QString &str )
{
QStringList lst;
int j = 0;
int i = str.find( '*', j );
while ( i != -1 ) {
if ( i > j && i <= (int)str.length() ) {
lst << str.mid( j, i - j );
lst << "*";
}
j = i + 1;
i = str.find( '*', j );
}
int l = str.length() - 1;
if ( str.mid( j, l - j + 1 ).length() > 0 )
lst << str.mid( j, l - j + 1 );
return lst;
}
QValueList<Document> Index::setupDummyTerm( const QStringList &terms )
{
TermList termList;
QStringList::ConstIterator it = terms.begin();
for ( ; it != terms.end(); ++it ) {
Entry *e = 0;
if ( dict[ *it ] ) {
e = dict[ *it ];
termList.append( new Term( *it, e->documents.count(), e->documents ) );
}
}
termList.sort();
QValueList<Document> maxList;
if ( !termList.count() )
return maxList;
maxList = termList.last()->documents;
termList.removeLast();
QValueList<Document>::iterator docIt;
Term *t = termList.first();
while ( t ) {
QValueList<Document> docs = t->documents;
for ( docIt = docs.begin(); docIt != docs.end(); ++docIt ) {
if ( maxList.findIndex( *docIt ) == -1 )
maxList.append( *docIt );
}
t = termList.next();
}
return maxList;
}
void Index::buildMiniDict( const QString &str )
{
if ( miniDict[ str ] )
miniDict[ str ]->positions.append( wordNum );
++wordNum;
}
bool Index::searchForPattern( const QStringList &patterns, const QStringList &words, const QString &fileName )
{
QFile file( fileName );
if ( !file.open( IO_ReadOnly ) ) {
qWarning( "cannot open file " + fileName );
return FALSE;
}
wordNum = 3;
miniDict.clear();
QStringList::ConstIterator cIt = words.begin();
for ( ; cIt != words.end(); ++cIt )
miniDict.insert( *cIt, new PosEntry( 0 ) );
QTextStream s( &file );
QString text = s.read();
bool valid = TRUE;
const QChar *buf = text.unicode();
QChar str[64];
QChar c = buf[0];
int j = 0;
int i = 0;
while ( (uint)j < text.length() ) {
if ( c == '<' || c == '&' ) {
valid = FALSE;
if ( i > 1 )
buildMiniDict( QString(str,i) );
i = 0;
c = buf[++j];
continue;
}
if ( ( c == '>' || c == ';' ) && !valid ) {
valid = TRUE;
c = buf[++j];
continue;
}
if ( !valid ) {
c = buf[++j];
continue;
}
if ( ( c.isLetterOrNumber() || c == '_' ) && i < 63 ) {
str[i] = c.lower();
++i;
} else {
if ( i > 1 )
buildMiniDict( QString(str,i) );
i = 0;
}
c = buf[++j];
}
if ( i > 1 )
buildMiniDict( QString(str,i) );
file.close();
QStringList::ConstIterator patIt = patterns.begin();
QStringList wordLst;
QValueList<uint> a, b;
QValueList<uint>::iterator aIt;
for ( ; patIt != patterns.end(); ++patIt ) {
wordLst = QStringList::split( ' ', *patIt );
a = miniDict[ wordLst[0] ]->positions;
for ( int j = 1; j < (int)wordLst.count(); ++j ) {
b = miniDict[ wordLst[j] ]->positions;
aIt = a.begin();
while ( aIt != a.end() ) {
if ( b.find( *aIt + 1 ) != b.end() ) {
(*aIt)++;
++aIt;
} else {
aIt = a.remove( aIt );
}
}
}
}
if ( a.count() )
return TRUE;
return FALSE;
}