Feature/polarion rte links

src/main/java/org/outerj/daisy/diff/html/dom/ImageNode.java

@@ -42,7 +42,13 @@ public boolean isSameText(Object other) {
         } catch (ClassCastException e) {
             return false;
         }
-        return getText().equalsIgnoreCase(otherImageNode.getText());
+        TagNode polarionRteLink = getEnclosingPolarionRteLink(this.getParent());
+        TagNode anotherPolarionRteLink = otherImageNode.getParent();
+        if (polarionRteLink != null && anotherPolarionRteLink != null && pairedLinks(polarionRteLink, anotherPolarionRteLink)) {
+            return true;
+        } else {
+            return getText().equalsIgnoreCase(otherImageNode.getText());
+        }
     }
 
     public AttributesImpl getAttributes() {

src/main/java/org/outerj/daisy/diff/html/dom/Node.java

@@ -18,8 +18,10 @@
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.Objects;
 
 import org.outerj.daisy.diff.html.dom.helper.LastCommonParentResult;
+import org.xml.sax.Attributes;
 
 /**
  * Represents any element in the DOM tree of a HTML file.
@@ -215,4 +217,43 @@ public void setWhiteAfter(boolean whiteAfter) {
 
     public abstract Node getRightMostChild();
 
+    protected TagNode getEnclosingPolarionRteLink(TagNode node) {
+        if (node == null) {
+            return null;
+        } else if (isPolarionRteLink(node)) {
+            return node;
+        } else {
+            TagNode parent = node.getParent();
+            if (parent != null && ("span".equals(parent.getQName()) || "a".equals(parent.getQName()))) {
+                return getEnclosingPolarionRteLink(parent);
+            } else {
+                return null; // If parent node is not span or anchor - stop navigating, because it's not a Polarion RTE link subtree
+            }
+        }
+    }
+
+    protected boolean isPolarionRteLink(TagNode node) {
+        return "span".equals(node.getQName()) && "polarion-rte-link".equals(node.getAttributes().getValue("class"));
+    }
+
+    protected boolean pairedLinks(TagNode linkA, TagNode linkB) {
+        return Objects.equals(getOptionId(linkA.getAttributes()), getOptionId(linkB.getAttributes()))
+                && (
+                Objects.equals(getItemId(linkA.getAttributes()), getPairedItemId(linkB.getAttributes()))
+                        || Objects.equals(getItemId(linkB.getAttributes()), getPairedItemId(linkA.getAttributes()))
+        );
+    }
+
+    protected String getItemId(Attributes attributes) {
+        return attributes.getValue("data-item-id");
+    }
+
+    protected String getPairedItemId(Attributes attributes) {
+        return attributes.getValue("data-paired-item-id");
+    }
+
+    protected String getOptionId(Attributes attributes) {
+        return attributes.getValue("data-option-id");
+    }
+
 }

src/main/java/org/outerj/daisy/diff/html/dom/SeparatingNode.java

@@ -18,14 +18,16 @@ public SeparatingNode(TagNode parent) {
 
     @Override
     public boolean equals(Object other) {
-        // No other separator is equal to this one. This has the effect
-        // that text nodes separated by such a separator can never be
-        // treated as a text sequence by the RangeDifferencer/TextNodeComparator.
-
-        if (other == this) {
+        TagNode polarionRteLink = getEnclosingPolarionRteLink(this.getParent());
+        TagNode anotherPolarionRteLink = (other instanceof TextNode) ? getEnclosingPolarionRteLink(((TextNode) other).getParent()) : null;
+        if (polarionRteLink != null && anotherPolarionRteLink != null && pairedLinks(polarionRteLink, anotherPolarionRteLink)) {
             return true;
+        } else {
+            // No other separator is equal to this one. This has the effect
+            // that text nodes separated by such a separator can never be
+            // treated as a text sequence by the RangeDifferencer/TextNodeComparator.
+            return other == this;
         }
-        return false;
     }
 
 }

src/main/java/org/outerj/daisy/diff/html/dom/TagNode.java

@@ -230,7 +230,11 @@ protected boolean isSimilarTag(Node another) {
         boolean result = false;
         if (another instanceof TagNode) {
             TagNode otherNode = (TagNode) another;
-            if (this.getQName().equalsIgnoreCase(otherNode.getQName())) {
+            TagNode polarionRteLink = getEnclosingPolarionRteLink(this);
+            TagNode anotherPolarionRteLink = getEnclosingPolarionRteLink(otherNode);
+            if (polarionRteLink != null && anotherPolarionRteLink != null && pairedLinks(polarionRteLink, anotherPolarionRteLink)) {
+                return true;
+            } else if (this.getQName().equalsIgnoreCase(otherNode.getQName())) {
                 result = hasSameAttributes(otherNode.getAttributes());
             }
         }

src/main/java/org/outerj/daisy/diff/html/dom/TextNode.java

@@ -85,8 +85,15 @@ public boolean isSameText(Object other) {
         } catch (ClassCastException e) {
             return false;
         }
-        return getText().replace('\n', ' ').equals(
-                otherTextNode.getText().replace('\n', ' '));
+
+        TagNode polarionRteLink = getEnclosingPolarionRteLink(this.getParent());
+        TagNode anotherPolarionRteLink = getEnclosingPolarionRteLink(otherTextNode.getParent());
+        if (polarionRteLink != null && anotherPolarionRteLink != null && pairedLinks(polarionRteLink, anotherPolarionRteLink)) {
+            return true;
+        } else {
+            return getText().replace('\n', ' ').equals(
+                    otherTextNode.getText().replace('\n', ' '));
+        }
     }
 
     public void setModification(Modification m) {