/*
 *  Copyright (c) 2002-2003 Jesper K. Pedersen <blackie@kde.org>
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License version 2 as published by the Free Software Foundation.
 *
 *  This library 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
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public License
 *  along with this library; see the file COPYING.LIB.  If not, write to
 *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301, USA.
 **/
#include "concregexp.h"
#include "widgetfactory.h"
#include "compoundregexp.h"

ConcRegExp::ConcRegExp( bool selected ) :RegExp( selected )
{
}

void ConcRegExp::addRegExp( RegExp *regExp )
{
	list.append(regExp);
    addChild( regExp );
}

RegExpList ConcRegExp::children()
{
    return list;
}


bool ConcRegExp::check( ErrorMap& map, bool first, bool last)
{
    bool f = first;
    bool possibleEmpty = true;
    for ( RegExpListIt it(list); *it; ++it ) {
        possibleEmpty = (*it)->check( map, f, last && it.atLast() ) && possibleEmpty;
        if ( ! possibleEmpty )
            f = false;
    }
    return possibleEmpty;
}

RegExp* ConcRegExp::lastRegExp()
{
    if ( list.count() == 0)
        return 0;
    else
        return list.at( list.count()-1);
}

QDomNode ConcRegExp::toXml( QDomDocument* doc ) const
{
    QDomElement top = doc->createElement( QString::fromLocal8Bit("Concatenation") );
    for ( RegExpListIt it(list); *it; ++it ) {
        top.appendChild( (*it)->toXml( doc ) );
    }
    return top;
}

bool ConcRegExp::load( QDomElement top, const QString& version )
{
    Q_ASSERT( top.tagName() == QString::fromLocal8Bit( "Concatenation" ) );

    for ( QDomNode child = top.firstChild(); !child.isNull(); child = child.nextSibling() ) {
        if ( ! child.isElement() )
            continue; // User might have added a comment.

        RegExp* regexp = WidgetFactory::createRegExp( child.toElement(), version );
        if ( regexp == 0 )
            return false;
        addRegExp( regexp );
    }
    return true;
}

bool ConcRegExp::operator==( const RegExp& other ) const
{
    // TODO: Merge with AltnRegExp::operator==
    if ( list.count() == 1 )
        return ( other == *(const_cast< QPtrList<RegExp>& >(list).at(0)) );

    if ( other.type() != type() )
        return false;

    const ConcRegExp& theOther = dynamic_cast<const ConcRegExp&>( other );

    if ( list.count() != theOther.list.count() )
        return false;

    RegExpListIt it1( list );
    RegExpListIt it2( theOther.list );

    for ( ; *it1 && *it2 ; ) {
        if ( ! (**it1 == **it2) )
            return false;
        ++it1;
        ++it2;
    }
    return true;
}


void ConcRegExp::replacePart( CompoundRegExp* replacement )
{
    RegExp* otherChild = replacement->child();
    ConcRegExp* otherConc = dynamic_cast<ConcRegExp*>( otherChild );
    if ( ! otherConc ) {
        // Watch out for garbage here!
        otherConc = new ConcRegExp( false );
        otherConc->addRegExp( otherChild );
    }

    RegExpList newList;
    RegExpListIt it1( list );
    while ( *it1 ) {
        (*it1)->replacePart( replacement );
        RegExpListIt it2 = it1;
        RegExpListIt it3( otherConc->list );
        bool match = true;
        int count = 0;

        // See if replacement is a sublist of list starting from what it1 points at
        for ( ; *it2 && * it3 && match ; ) {
            if (! ( **it2 == **it3 ) )
                match = false;
            ++it2;
            ++it3;
            ++count;
        }

        if ( match && ! *it3) {
            // I found a match, delete the element in it1, which is common with it3
            while ( *it1 != *it2 ) {
                RegExp* item = *it1;
                ++it1;
                delete item;
            }
            RegExp* theClone = replacement->clone();
            newList.append( theClone );
            addChild( theClone );
        }
        else {
            newList.append( *it1 );
            ++it1;
        }
    }
    list = newList;
}


