SVG: Add possibility to customize renderers for text chunks

DEVSIX-5428

Autoported commit.
Original commit hash: [9a0af2f67]

Author: ar3em

itext.tests/itext.svg.tests/itext/svg/customization/CustomizeTextLeafSvgNodeRendererTest.cs

@@ -0,0 +1,79 @@
+using System;
+using iText.Kernel.Colors;
+using iText.Kernel.Geom;
+using iText.Kernel.Pdf;
+using iText.Kernel.Pdf.Canvas;
+using iText.Kernel.Pdf.Xobject;
+using iText.Kernel.Utils;
+using iText.StyledXmlParser.Node;
+using iText.Svg;
+using iText.Svg.Converter;
+using iText.Svg.Processors.Impl;
+using iText.Svg.Renderers;
+using iText.Svg.Renderers.Factories;
+using iText.Svg.Renderers.Impl;
+using iText.Test;
+
+namespace iText.Svg.Customization {
+    public class CustomizeTextLeafSvgNodeRendererTest : SvgIntegrationTest {
+        public static readonly String SOURCE_FOLDER = iText.Test.TestUtil.GetParentProjectDirectory(NUnit.Framework.TestContext
+            .CurrentContext.TestDirectory) + "/resources/itext/svg/customization/CustomizeTextLeafSvgNodeRendererTest/";
+
+        public static readonly String DESTINATION_FOLDER = NUnit.Framework.TestContext.CurrentContext.TestDirectory
+             + "/test/itext/svg/customization/CustomizeTextLeafSvgNodeRendererTest/";
+
+        [NUnit.Framework.OneTimeSetUp]
+        public static void BeforeClass() {
+            ITextTest.CreateDestinationFolder(DESTINATION_FOLDER);
+        }
+
+        [NUnit.Framework.Test]
+        public virtual void TestCustomizeTextLeafSvgNodeRenderer() {
+            String pdfFilename = "customizeTextLeafSvgNodeRenderer.pdf";
+            PdfDocument doc = new PdfDocument(new PdfWriter(DESTINATION_FOLDER + pdfFilename));
+            doc.AddNewPage();
+            SvgConverterProperties properties = new SvgConverterProperties();
+            properties.SetRendererFactory(new CustomizeTextLeafSvgNodeRendererTest.CustomTextLeafOverridingSvgNodeRendererFactory
+                ());
+            String svg = "<svg viewBox=\"0 0 240 80\" xmlns=\"http://www.w3.org/2000/svg\">\n" + "  <text x=\"20\" y=\"35\" class=\"small\">Hello world</text>\n"
+                 + "</svg>";
+            PdfFormXObject form = SvgConverter.ConvertToXObject(svg, doc, properties);
+            new PdfCanvas(doc.GetPage(1)).AddXObjectFittedIntoRectangle(form, new Rectangle(100, 100, 240, 80));
+            doc.Close();
+            NUnit.Framework.Assert.IsNull(new CompareTool().CompareByContent(DESTINATION_FOLDER + pdfFilename, SOURCE_FOLDER
+                 + "cmp_" + pdfFilename, DESTINATION_FOLDER, "diff_"));
+        }
+
+        private class CustomTextLeafOverridingSvgNodeRendererFactory : DefaultSvgNodeRendererFactory {
+            public override ISvgNodeRenderer CreateSvgNodeRendererForTag(IElementNode tag, ISvgNodeRenderer parent) {
+                if (SvgConstants.Tags.TEXT_LEAF.Equals(tag.Name())) {
+                    return new CustomizeTextLeafSvgNodeRendererTest.CustomTextLeafSvgNodeRenderer();
+                }
+                else {
+                    return base.CreateSvgNodeRendererForTag(tag, parent);
+                }
+            }
+        }
+
+        private class CustomTextLeafSvgNodeRenderer : TextLeafSvgNodeRenderer {
+            public override ISvgNodeRenderer CreateDeepCopy() {
+                CustomizeTextLeafSvgNodeRendererTest.CustomTextLeafSvgNodeRenderer copy = new CustomizeTextLeafSvgNodeRendererTest.CustomTextLeafSvgNodeRenderer
+                    ();
+                DeepCopyAttributesAndStyles(copy);
+                return copy;
+            }
+
+            protected internal override void DoDraw(SvgDrawContext context) {
+                if (this.attributesAndStyles != null && this.attributesAndStyles.ContainsKey(SvgConstants.Attributes.TEXT_CONTENT
+                    )) {
+                    PdfCanvas currentCanvas = context.GetCurrentCanvas();
+                    currentCanvas.SetFillColor(ColorConstants.RED);
+                    currentCanvas.MoveText(context.GetTextMove()[0], context.GetTextMove()[1]);
+                    String initialText = this.attributesAndStyles.Get(SvgConstants.Attributes.TEXT_CONTENT);
+                    String amendedText = "_" + initialText + "_";
+                    currentCanvas.ShowText(amendedText);
+                }
+            }
+        }
+    }
+}

itext.tests/itext.svg.tests/resources/itext/svg/customization/CustomizeTextLeafSvgNodeRendererTest/cmp_customizeTextLeafSvgNodeRenderer.pdf

@@ -330,6 +330,9 @@ public sealed class Tags {
             /// <since>7.1.2</since>
             public const String TEXT = "text";
 
+            /// <summary>Phantom tag for text leaf.</summary>
+            public const String TEXT_LEAF = ":text-leaf";
+
             /// <summary>Tag defining a path on which text can be drawn.</summary>
             public const String TEXT_PATH = "textPath";
 

itext/itext.svg/itext/svg/SvgConstants.cs

@@ -44,6 +44,7 @@ source product.
 using System.Collections.Generic;
 using iText.StyledXmlParser.Css;
 using iText.StyledXmlParser.Node;
+using iText.StyledXmlParser.Node.Impl.Jsoup.Node;
 using iText.Svg;
 using iText.Svg.Css.Impl;
 using iText.Svg.Exceptions;
@@ -234,7 +235,10 @@ private void ProcessText(ITextNode textNode) {
             if (parentRenderer is TextSvgBranchRenderer) {
                 String wholeText = textNode.WholeText();
                 if (!"".Equals(wholeText) && !SvgTextUtil.IsOnlyWhiteSpace(wholeText)) {
-                    TextLeafSvgNodeRenderer textLeaf = new TextLeafSvgNodeRenderer();
+                    IElementNode textLeafElement = new JsoupElementNode(new iText.StyledXmlParser.Jsoup.Nodes.Element(iText.StyledXmlParser.Jsoup.Parser.Tag
+                        .ValueOf(SvgConstants.Tags.TEXT_LEAF), ""));
+                    ISvgTextNodeRenderer textLeaf = (ISvgTextNodeRenderer)this.rendererFactory.CreateSvgNodeRendererForTag(textLeafElement
+                        , parentRenderer);
                     textLeaf.SetParent(parentRenderer);
                     textLeaf.SetAttribute(SvgConstants.Attributes.TEXT_CONTENT, wholeText);
                     ((TextSvgBranchRenderer)parentRenderer).AddChild(textLeaf);

itext/itext.svg/itext/svg/processors/impl/DefaultSvgProcessor.cs

@@ -88,6 +88,7 @@ public virtual IDictionary<String, Type> GetMapping() {
             result.Put(SvgConstants.Tags.TEXT, typeof(TextSvgBranchRenderer));
             result.Put(SvgConstants.Tags.TSPAN, typeof(TextSvgTSpanBranchRenderer));
             result.Put(SvgConstants.Tags.USE, typeof(UseSvgNodeRenderer));
+            result.Put(SvgConstants.Tags.TEXT_LEAF, typeof(TextLeafSvgNodeRenderer));
             return result;
         }
 

itext/itext.svg/itext/svg/renderers/factories/DefaultSvgNodeRendererMapper.cs

@@ -1 +1 @@
-e1a23805224ab56798adce94240ba5958890c466
+9a0af2f6776cbf324e0d7d108e64cc32e8b65187