[gui] Fix value map editor widget configuration's load from CSV parsing

src/gui/editorwidgets/qgsvaluemapconfigdlg.cpp

@@ -301,14 +301,18 @@ void QgsValueMapConfigDlg::loadFromCSVButtonPushed()
   const QString fileName = QFileDialog::getOpenFileName( nullptr, tr( "Load Value Map from File" ), QDir::homePath() );
   if ( fileName.isNull() )
     return;
+  loadMapFromCSV( fileName );
+}
 
-  QFile f( fileName );
+void QgsValueMapConfigDlg::loadMapFromCSV( const QString &filePath )
+{
+  QFile f( filePath );
 
   if ( !f.open( QIODevice::ReadOnly ) )
   {
     QMessageBox::information( nullptr,
                               tr( "Load Value Map from File" ),
-                              tr( "Could not open file %1\nError was: %2" ).arg( fileName, f.errorString() ),
+                              tr( "Could not open file %1\nError was: %2" ).arg( filePath, f.errorString() ),
                               QMessageBox::Cancel );
     return;
   }
@@ -316,53 +320,26 @@ void QgsValueMapConfigDlg::loadFromCSVButtonPushed()
   QTextStream s( &f );
   s.setAutoDetectUnicode( true );
 
-  const thread_local QRegularExpression re0( "^([^;]*?);(.*?)$" );
-  const thread_local QRegularExpression re1( "^([^,]*?),(.*?)$" );
-
+  const thread_local QRegularExpression re( "(?:^\"|[;,]\")(\"\"|[\\w\\W]*?)(?=\"[;,]|\"$)|(?:^(?!\")|[;,](?!\"))([^;,]*?)(?=$|[;,])|(\\r\\n|\\n)" );
   QList<QPair<QString, QVariant>> map;
-
   while ( !s.atEnd() )
   {
     const QString l = s.readLine().trimmed();
-
-    QString key;
-    QString val;
-
-    const QRegularExpressionMatch re0match = re0.match( l );
-    if ( re0match.hasMatch() )
+    QRegularExpressionMatchIterator matches = re.globalMatch( l );
+    QStringList ceils;
+    while ( matches.hasNext() && ceils.size() < 2 )
     {
-      key = re0match.captured( 1 ).trimmed();
-      val = re0match.captured( 2 ).trimmed();
-    }
-    else
-    {
-      const QRegularExpressionMatch re1match = re1.match( l );
-      if ( re1match.hasMatch() )
-      {
-        key = re1match.captured( 1 ).trimmed();
-        val = re1match.captured( 2 ).trimmed();
-      }
-      else
-      {
-        continue;
-      }
+      const QRegularExpressionMatch match = matches.next();
+      ceils << match.capturedTexts().last().trimmed().replace( QLatin1String( "\"\"" ), QLatin1String( "\"" ) );
     }
 
-    if ( ( key.startsWith( '\"' ) && key.endsWith( '\"' ) ) ||
-         ( key.startsWith( '\'' ) && key.endsWith( '\'' ) ) )
-    {
-      key = key.mid( 1, key.length() - 2 );
-    }
-
-    if ( ( val.startsWith( '\"' ) && val.endsWith( '\"' ) ) ||
-         ( val.startsWith( '\'' ) && val.endsWith( '\'' ) ) )
-    {
-      val = val.mid( 1, val.length() - 2 );
-    }
+    if ( ceils.size() != 2 )
+      continue;
 
+    QString key = ceils[0];
+    QString val = ceils[1];
     if ( key == QgsApplication::nullRepresentation() )
       key = QgsValueMapFieldFormatter::NULL_VALUE;
-
     map.append( qMakePair( key, val ) );
   }
 

src/gui/editorwidgets/qgsvaluemapconfigdlg.h

@@ -58,6 +58,13 @@ class GUI_EXPORT QgsValueMapConfigDlg : public QgsEditorConfigWidget, private Ui
      */
     void updateMap( const QList<QPair<QString, QVariant>> &list, bool insertNull );
 
+    /**
+     * Updates the displayed table with the values from a CSV file.
+     * \param filePath the absolute file path of the CSV file.
+     * \since QGIS 3.24
+     */
+    void loadMapFromCSV( const QString &filePath );
+
     /**
      * Populates a \a comboBox with the appropriate entries based on a value map \a configuration.
      *

tests/src/gui/CMakeLists.txt

@@ -58,6 +58,7 @@ set(TESTS
   testqgslayoutgui.cpp
   testqgslayoutview.cpp
   testqgsvaluemapwidgetwrapper.cpp
+  testqgsvaluemapconfigdlg.cpp
   testqgsvaluerelationwidgetwrapper.cpp
   testqgsrelationeditorwidget.cpp
   testqgsrelationreferencewidget.cpp

tests/src/gui/testqgsvaluemapconfigdlg.cpp

@@ -0,0 +1,90 @@
+/***************************************************************************
+    testqgsvaluemapconfigdlg.cpp
+     --------------------------------------
+    Date                 : 14 02 2021
+    Copyright            : (C) 2019 Stephen Knox
+    Email                : stephenknox73 at gmail 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 "qgstest.h"
+
+#include "editorwidgets/qgsvaluemapconfigdlg.h"
+#include "qgsgui.h"
+#include "qgseditorwidgetregistry.h"
+#include "qgsapplication.h"
+#include "qgsproject.h"
+#include "qgsvectorlayer.h"
+
+class TestQgsValueMapConfigDlg : public QObject
+{
+    Q_OBJECT
+  public:
+    TestQgsValueMapConfigDlg() = default;
+
+  private slots:
+    void initTestCase(); // will be called before the first testfunction is executed.
+    void cleanupTestCase(); // will be called after the last testfunction was executed.
+    void init(); // will be called before each testfunction is executed.
+    void cleanup(); // will be called after every testfunction.
+
+    void testLoadFromCSV();
+};
+
+void TestQgsValueMapConfigDlg::initTestCase()
+{
+  QgsApplication::init();
+  QgsApplication::initQgis();
+  QgsGui::editorWidgetRegistry()->initEditors();
+}
+
+void TestQgsValueMapConfigDlg::cleanupTestCase()
+{
+  QgsApplication::exitQgis();
+}
+
+void TestQgsValueMapConfigDlg::init()
+{
+}
+
+void TestQgsValueMapConfigDlg::cleanup()
+{
+}
+
+void TestQgsValueMapConfigDlg::testLoadFromCSV()
+{
+  const QString dataDir( TEST_DATA_DIR );
+  QgsVectorLayer vl( QStringLiteral( "LineString?crs=epsg:3111&field=pk:int&field=name:string" ), QStringLiteral( "vl1" ), QStringLiteral( "memory" ) );
+
+  QList<QVariant> valueList;
+  QVariantMap value;
+  value.insert( QStringLiteral( "Basic unquoted record" ), QString( "1" ) );
+  valueList << value;
+  value.clear();
+  value.insert( QStringLiteral( "Forest type" ), QString( "2" ) );
+  valueList << value;
+  value.clear();
+  value.insert( QStringLiteral( "So-called \"data\"" ), QString( "three" ) );
+  valueList << value;
+  value.clear();
+  value.insert( QStringLiteral( "444" ), QString( "4" ) );
+  valueList << value;
+  value.clear();
+  value.insert( QStringLiteral( "five" ), QString( "5" ) );
+  valueList << value;
+
+  QgsValueMapConfigDlg *valueMapConfig = static_cast<QgsValueMapConfigDlg *>( QgsGui::editorWidgetRegistry()->createConfigWidget( QStringLiteral( "ValueMap" ), &vl, 1, nullptr ) );
+  valueMapConfig->loadMapFromCSV( dataDir + QStringLiteral( "/valuemapsample.csv" ) );
+  QCOMPARE( valueMapConfig->config().value( QStringLiteral( "map" ) ).toList(), valueList );
+  delete valueMapConfig;
+}
+
+QGSTEST_MAIN( TestQgsValueMapConfigDlg )
+#include "testqgsvaluemapconfigdlg.moc"

tests/testdata/valuemapsample.csv

@@ -0,0 +1,5 @@
+1,Basic unquoted record,Some description
+2,Forest type,"Quoted data"
+three,"So-called ""data""",Unquoted remark
+4,"444",No comment
+5,five