Improve our html editor; add syntax highlighting for script tags; hyperlink detection and navigatio…

editor/tools/plugins/com.google.dart.tools.ui.web/src/com/google/dart/tools/ui/web/html/HtmlHyperlinkDetector.java

Index: editor/tools/plugins/com.google.dart.tools.ui.web/src/com/google/dart/tools/ui/web/html/HtmlHyperlinkDetector.java
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--- editor/tools/plugins/com.google.dart.tools.ui.web/src/com/google/dart/tools/ui/web/html/HtmlHyperlinkDetector.java	(revision 0)
+++ editor/tools/plugins/com.google.dart.tools.ui.web/src/com/google/dart/tools/ui/web/html/HtmlHyperlinkDetector.java	(revision 0)
@@ -0,0 +1,119 @@
+/*
+ * Copyright (c) 2012, the Dart project authors.
+ * 
+ * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ * 
+ * http://www.eclipse.org/legal/epl-v10.html
+ * 
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+package com.google.dart.tools.ui.web.html;
+
+import com.google.dart.tools.ui.web.utils.FileHyperlink;
+
+import org.eclipse.core.resources.IFile;
+import org.eclipse.core.resources.IResource;
+import org.eclipse.core.runtime.Path;
+import org.eclipse.jface.text.BadLocationException;
+import org.eclipse.jface.text.IDocument;
+import org.eclipse.jface.text.IRegion;
+import org.eclipse.jface.text.ITextViewer;
+import org.eclipse.jface.text.Region;
+import org.eclipse.jface.text.hyperlink.AbstractHyperlinkDetector;
+import org.eclipse.jface.text.hyperlink.IHyperlink;
+
+/**
+ * Detects IFile links in html files.
+ */
+class HtmlHyperlinkDetector extends AbstractHyperlinkDetector {
+  private HtmlEditor editor;
+
+  public HtmlHyperlinkDetector(HtmlEditor editor) {
+    this.editor = editor;
+  }
+
+  @Override
+  public IHyperlink[] detectHyperlinks(ITextViewer textViewer, IRegion region,
+      boolean canShowMultipleHyperlinks) {
+    if (region == null || textViewer == null || editor == null) {
+      return null;
+    }
+
+    IDocument document = textViewer.getDocument();
+
+    try {
+      IRegion strRegion = getRegionForQuotedText(document, region.getOffset());
+
+      if (strRegion == null) {
+        return null;
+      }
+
+      // Validate that this path is an existing file.
+      IFile file = getFileFor(
+          textViewer,
+          document.get(strRegion.getOffset(), strRegion.getLength()));
+
+      if (file != null) {
+        return new IHyperlink[] {new FileHyperlink(strRegion, file)};
+      }
+    } catch (BadLocationException e) {
+
+    }
+
+    return null;
+  }
+
+  private IFile getFileFor(ITextViewer textViewer, String path) {
+    IFile baseFile = (IFile) editor.getEditorInput().getAdapter(IFile.class);
+
+    if (baseFile != null) {
+      IResource resource = baseFile.getParent().findMember(new Path(path));
+
+      if (resource instanceof IFile && resource.exists()) {
+        return (IFile) resource;
+      }
+    }
+
+    return null;
+  }
+
+  private IRegion getRegionForQuotedText(IDocument document, int offset)
+      throws BadLocationException {
+    IRegion border = document.getLineInformationOfOffset(offset);
+
+    int start = offset;
+    int end = offset;
+
+    char c = document.getChar(start);
+
+    while (c != '"' && c != '\'') {
+      start--;
+
+      if (start < border.getOffset()) {
+        return null;
+      }
+
+      c = document.getChar(start);
+    }
+
+    c = document.getChar(end);
+
+    while (c != '"' && c != '\'') {
+      end++;
+
+      if (end > (border.getOffset() + border.getLength())) {
+        return null;
+      }
+
+      c = document.getChar(end);
+    }
+
+    return new Region(start + 1, end - start - 1);
+  }
+
+}