From 559c31d2f28d9a77655538d994c3213d916b8d0c Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sun, 13 Nov 2016 22:10:33 +0000
Subject: Ensure embedded style map is not removed by Word

---
 .../mammoth/internal/docx/EmbeddedStyleMap.java    | 74 ++++++++++++++++++++--
 1 file changed, 69 insertions(+), 5 deletions(-)

(limited to 'src/main/java/org/zwobble/mammoth/internal/docx/EmbeddedStyleMap.java')

diff --git a/src/main/java/org/zwobble/mammoth/internal/docx/EmbeddedStyleMap.java b/src/main/java/org/zwobble/mammoth/internal/docx/EmbeddedStyleMap.java
index b01c0f5..4acce3f 100644
--- a/src/main/java/org/zwobble/mammoth/internal/docx/EmbeddedStyleMap.java
+++ b/src/main/java/org/zwobble/mammoth/internal/docx/EmbeddedStyleMap.java
@@ -1,20 +1,84 @@
 package org.zwobble.mammoth.internal.docx;
 
 import org.zwobble.mammoth.internal.archives.Archive;
+import org.zwobble.mammoth.internal.archives.Archives;
 import org.zwobble.mammoth.internal.archives.MutableArchive;
 import org.zwobble.mammoth.internal.util.Streams;
+import org.zwobble.mammoth.internal.xml.*;
+import org.zwobble.mammoth.internal.xml.parsing.XmlParser;
 
-import java.io.*;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Optional;
 
+import static org.zwobble.mammoth.internal.util.Casts.tryCast;
+import static org.zwobble.mammoth.internal.util.Iterables.findIndex;
+import static org.zwobble.mammoth.internal.util.Maps.map;
+
 public class EmbeddedStyleMap {
-    private static final String PATH = "mammoth/style-map";
+    private static final String STYLE_MAP_PATH = "mammoth/style-map";
+    private static final String ABSOLUTE_STYLE_MAP_PATH = "/" + STYLE_MAP_PATH;
+    private static final String RELATIONSHIPS_PATH = "word/_rels/document.xml.rels";
+    private static final String CONTENT_TYPES_PATH = "[Content_Types].xml";
+
+    public static final NamespacePrefixes RELATIONSHIPS_NAMESPACES = NamespacePrefixes.builder()
+        .defaultPrefix("http://schemas.openxmlformats.org/package/2006/relationships")
+        .build();
+
+    public static final NamespacePrefixes CONTENT_TYPES_NAMESPACES = NamespacePrefixes.builder()
+        .defaultPrefix("http://schemas.openxmlformats.org/package/2006/content-types")
+        .build();
 
     public static Optional<String> readStyleMap(Archive file) throws IOException {
-        return file.tryGetInputStream(PATH).map(Streams::toString);
+        return file.tryGetInputStream(STYLE_MAP_PATH).map(Streams::toString);
+    }
+
+    public static void embedStyleMap(MutableArchive archive, String styleMap) throws IOException {
+        archive.writeEntry(STYLE_MAP_PATH, styleMap);
+        updateRelationships(archive);
+        updateContentTypes(archive);
     }
 
-    public static void embedStyleMap(MutableArchive archive, String styleMap) {
-        archive.writeEntry(PATH, styleMap);
+    private static void updateRelationships(MutableArchive archive) throws IOException {
+        XmlParser parser = new XmlParser(RELATIONSHIPS_NAMESPACES);
+        XmlElement relationships = parser.parseStream(Archives.getInputStream(archive, RELATIONSHIPS_PATH));
+        XmlElement relationship = XmlNodes.element("Relationship", map(
+            "Id", "rMammothStyleMap",
+            "Type", "http://schemas.zwobble.org/mammoth/style-map",
+            "Target", ABSOLUTE_STYLE_MAP_PATH
+        ));
+        XmlElement updatedRelationships = updateOrAddElement(relationships, relationship, "Id");
+        archive.writeEntry(RELATIONSHIPS_PATH, XmlWriter.toString(updatedRelationships, RELATIONSHIPS_NAMESPACES));
+    }
+
+    private static void updateContentTypes(MutableArchive archive) throws IOException {
+        XmlParser parser = new XmlParser(CONTENT_TYPES_NAMESPACES);
+        XmlElement contentTypes = parser.parseStream(Archives.getInputStream(archive, CONTENT_TYPES_PATH));
+        XmlElement override = XmlNodes.element("Override", map(
+            "PartName", ABSOLUTE_STYLE_MAP_PATH,
+            "ContentType", "text/prs.mammoth.style-map"
+        ));
+        XmlElement updatedRelationships = updateOrAddElement(contentTypes, override, "PartName");
+        archive.writeEntry(CONTENT_TYPES_PATH, XmlWriter.toString(updatedRelationships, CONTENT_TYPES_NAMESPACES));
+    }
+
+    private static XmlElement updateOrAddElement(XmlElement parent, XmlElement element, String identifyingAttribute) {
+        int index = findIndex(parent.getChildren(), child ->
+            tryCast(XmlElement.class, child)
+                .map(childElement ->
+                    childElement.getName().equals(element.getName()) &&
+                    childElement.getAttributeOrNone(identifyingAttribute).equals(element.getAttributeOrNone(identifyingAttribute))
+                )
+                .orElse(false)
+        );
+        List<XmlNode> children = new ArrayList<>(parent.getChildren());
+
+        if (index == -1) {
+            children.add(element);
+        } else {
+            children.set(index, element);
+        }
+        return new XmlElement(parent.getName(), parent.getAttributes(), children);
     }
 }
-- 
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