qgssymbollayerreference.cpp

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/***************************************************************************
 qgssymbollayerreference.cpp
 ---------------------
 begin                : July 2019
 copyright            : (C) 2019 by Hugo Mercier / Oslandia
 email                : infos at oslandia dot com
 ***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/
 
#include "qgssymbollayerreference.h"
 
#include "qgis.h"
 
#include <QRegularExpression>
#include <QString>
 
using namespace Qt::StringLiterals;
 
QString symbolLayerReferenceListToString( const QgsSymbolLayerReferenceList &lst )
{
  QStringList slst;
  slst.reserve( lst.size() * 2 );
  for ( const QgsSymbolLayerReference &ref : lst )
  {
    slst << ref.layerId();
    slst << ref.symbolLayerIdV2();
  }
  return slst.join( ';' );
}
 
QgsSymbolLayerReferenceList stringToSymbolLayerReferenceList( const QString &str )
{
  QgsSymbolLayerReferenceList lst;
  if ( str.isEmpty() )
    return lst;
 
  if ( str.contains( ',' ) )
  {
    // TODO QGIS 5 : remove this if branch, keep only else part
    Q_NOWARN_DEPRECATED_PUSH
 
    // old masked symbol layer format (before 3.30), we use unique id now!
    // we load it the old fashion way and we will update the new one later when
    // the whole project is loaded
 
    // when saving we used ; as a concatenator... but that was silly, cos maybe the symbol keys contain this string!
    // try to handle this gracefully via regex...
    const thread_local QRegularExpression partsRx( u"((?:.*?),(?:.*?),(?:(?:\\d+,)+)?(?:\\d+);)"_s );
    QRegularExpressionMatchIterator partsIt = partsRx.globalMatch( str + ';' );
 
    while ( partsIt.hasNext() )
    {
      const QRegularExpressionMatch partMatch = partsIt.next();
      const QString tuple = partMatch.captured( 1 );
 
      // We should have "layer_id,symbol_key,symbol_layer_index0,symbol_layer_index1,..."
      // EXCEPT that the symbol_key CAN have commas, so this whole logic is extremely broken.
      // Let's see if a messy regex can save the day!
      const thread_local QRegularExpression rx( u"(.*?),(.*?),((?:\\d+,)+)?(\\d+)"_s );
 
      const QRegularExpressionMatch match = rx.match( tuple );
      if ( !match.hasMatch() )
        continue;
 
      const QString layerId = match.captured( 1 );
      const QString symbolKey = match.captured( 2 );
      const QStringList indices = QString( match.captured( 3 ) + match.captured( 4 ) ).split( ',' );
 
      QVector<int> indexPath;
      indexPath.reserve( indices.size() );
      for ( const QString &index : indices )
      {
        indexPath.append( index.toInt() );
      }
      lst.append( QgsSymbolLayerReference( layerId, QgsSymbolLayerId( symbolKey, indexPath ) ) );
      Q_NOWARN_DEPRECATED_POP
    }
  }
  else
  {
    const QStringList elems = str.split( ';' );
    for ( int i = 0; i < elems.size(); )
    {
      lst << QgsSymbolLayerReference( elems[i], elems[i + 1] );
      i += 2;
    }
  }
 
  return lst;
}