Merge pull request #3996 from jgrocha/literal

SLD parsing: handling ogc:Literal within CssParameter

src/core/symbology-ng/qgssymbollayerutils.cpp

@@ -2566,6 +2566,7 @@ QDomElement QgsSymbolLayerUtils::createSvgParameterElement( QDomDocument &doc, c
 QgsStringMap QgsSymbolLayerUtils::getSvgParameterList( QDomElement &element )
 {
   QgsStringMap params;
+  QString value;
 
   QDomElement paramElem = element.firstChildElement();
   while ( !paramElem.isNull() )
@@ -2573,7 +2574,23 @@ QgsStringMap QgsSymbolLayerUtils::getSvgParameterList( QDomElement &element )
     if ( paramElem.localName() == QLatin1String( "SvgParameter" ) || paramElem.localName() == QLatin1String( "CssParameter" ) )
     {
       QString name = paramElem.attribute( QStringLiteral( "name" ) );
-      QString value = paramElem.firstChild().nodeValue();
+      if ( paramElem.firstChild().nodeType() == QDomNode::TextNode )
+      {
+        value = paramElem.firstChild().nodeValue();
+      }
+      else
+      {
+        if ( paramElem.firstChild().nodeType() == QDomNode::ElementNode &&
+             paramElem.firstChild().localName() == QLatin1String( "Literal" ) )
+        {
+          QgsDebugMsg( paramElem.firstChild().localName() );
+          value = paramElem.firstChild().firstChild().nodeValue();
+        }
+        else
+        {
+          QgsDebugMsg( QString( "unexpected child of %1" ).arg( paramElem.localName() ) );
+        }
+      }
 
       if ( !name.isEmpty() && !value.isEmpty() )
         params[ name ] = value;

tests/src/python/CMakeLists.txt

@@ -105,6 +105,7 @@ ADD_PYTHON_TEST(PyQgsSQLStatement test_qgssqlstatement.py)
 ADD_PYTHON_TEST(PyQgsStringStatisticalSummary test_qgsstringstatisticalsummary.py)
 ADD_PYTHON_TEST(PyQgsSymbolLayer test_qgssymbollayer.py)
 ADD_PYTHON_TEST(PyQgsSymbolLayerCreateSld test_qgssymbollayer_createsld.py)
+ADD_PYTHON_TEST(PyQgsSymbolLayerReadSld test_qgssymbollayer_readsld.py)
 ADD_PYTHON_TEST(PyQgsArrowSymbolLayer test_qgsarrowsymbollayer.py)
 ADD_PYTHON_TEST(PyQgsSymbolExpressionVariables test_qgssymbolexpressionvariables.py)
 ADD_PYTHON_TEST(PyQgsSyntacticSugar test_syntactic_sugar.py)

tests/src/python/test_qgssymbollayer_readsld.py

@@ -0,0 +1,89 @@
+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    test_qgssymbollayer_readsld.py
+    ---------------------
+    Date                 : January 2017
+    Copyright            : (C) 2017, Jorge Gustavo Rocha
+    Email                : jgr at di dot uminho dot pt
+***************************************************************************
+*                                                                         *
+*   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.                                   *
+*                                                                         *
+***************************************************************************
+"""
+
+__author__ = 'Jorge Gustavo Rocha'
+__date__ = 'January 2017'
+__copyright__ = '(C) 2017, Jorge Gustavo Rocha'
+# This will get replaced with a git SHA1 when you do a git archive
+__revision__ = '$Format:%H$'
+
+import qgis  # NOQA
+
+import os
+from qgis.testing import start_app, unittest
+from qgis.core import (QgsVectorLayer,
+                       QgsFeature,
+                       QgsGeometry,
+                       QgsPoint
+                       )
+from qgis.testing import unittest
+from qgis.testing.mocked import get_iface
+from utilities import unitTestDataPath
+
+start_app()
+
+TEST_DATA_DIR = unitTestDataPath()
+
+def createLayerWithOneLine():
+    # create a temporary layer
+    # linelayer = iface.addVectorLayer("LineString?crs=epsg:4326&field=gid:int&field=name:string", "simple_line", "memory")
+    linelayer = QgsVectorLayer("LineString?crs=epsg:4326&field=gid:int&field=name:string", "simple_line", "memory")
+    one = QgsFeature(linelayer.dataProvider().fields(), 0)
+    one.setAttributes([1, 'one'])
+    one.setGeometry(QgsGeometry.fromPolyline([QgsPoint(-7, 38), QgsPoint(-8, 42)]))
+    linelayer.dataProvider().addFeatures([one])
+    return linelayer
+
+class TestQgsSymbolLayerReadSld(unittest.TestCase):
+
+    """
+    This class checks if SLD styles are properly applied
+    """
+
+    def setUp(self):
+        self.iface = get_iface()
+
+    # test <CSSParameter>VALUE<CSSParameter/>
+    # test <CSSParameter><ogc:Literal>VALUE<ogc:Literal/><CSSParameter/>
+    def test_Literal_within_CSSParameter(self):
+        layer = createLayerWithOneLine()
+        mFilePath = os.path.join(TEST_DATA_DIR, 'symbol_layer/external_sld/simple_streams.sld')
+        layer.loadSldStyle(mFilePath)
+        props = layer.renderer().symbol().symbolLayers()[0].properties()
+
+        def testLineColor():
+            # stroke CSSParameter within ogc:Literal
+            # expected color is #003EBA, RGB 0,62,186
+            self.assertEqual(layer.renderer().symbol().symbolLayers()[0].color().name(), '#003eba')
+
+        def testLineWidth():
+            # stroke-width CSSParameter within ogc:Literal
+            self.assertEqual(props['line_width'], '2')
+
+        def testLineOpacity():
+            # stroke-opacity CSSParameter NOT within ogc:Literal
+            # stroke-opacity=0.1
+            self.assertEqual(props['line_color'], '0,62,186,25')
+
+        testLineColor()
+        testLineWidth()
+        testLineOpacity()
+
+if __name__ == '__main__':
+    unittest.main()

tests/testdata/symbol_layer/external_sld/simple_streams.sld

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<StyledLayerDescriptor version="1.0.0" xmlns="http://www.opengis.net/sld" xmlns:ogc="http://www.opengis.net/ogc"
+  xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://www.opengis.net/sld http://schemas.opengis.net/sld/1.0.0/StyledLayerDescriptor.xsd">
+  <NamedLayer>
+    <Name>Simple Streams</Name>
+    <UserStyle>
+
+      <Title>Default Styler for streams segments</Title>
+      <Abstract>Blue lines, 2px wide</Abstract>
+      <FeatureTypeStyle>
+        <FeatureTypeName>Feature</FeatureTypeName>
+        <Rule>
+          <Title>Streams</Title>
+          <LineSymbolizer>
+            <Stroke>
+              <CssParameter name="stroke">
+                <ogc:Literal>#003EBA</ogc:Literal>
+              </CssParameter>
+              <CssParameter name="stroke-width">
+                <ogc:Literal>2</ogc:Literal>
+              </CssParameter>
+              <CssParameter name="stroke-opacity">0.1</CssParameter>
+            </Stroke>
+          </LineSymbolizer>
+        </Rule>
+      </FeatureTypeStyle>
+    </UserStyle>
+  </NamedLayer>
+</StyledLayerDescriptor>