Improved HTML parsing

editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/html/ast/visitor/EmbeddedDartVisitor.java

Index: editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/html/ast/visitor/EmbeddedDartVisitor.java
diff --git a/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/html/ast/visitor/EmbeddedDartVisitor.java b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/html/ast/visitor/EmbeddedDartVisitor.java
new file mode 100644
index 0000000000000000000000000000000000000000..e781cfb1723a418838c356509e64c144fcfcd18e
--- /dev/null
+++ b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/html/ast/visitor/EmbeddedDartVisitor.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2013, 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.engine.html.ast.visitor;
+
+import com.google.dart.engine.ast.ASTVisitor;
+import com.google.dart.engine.ast.CompilationUnit;
+import com.google.dart.engine.html.ast.EmbeddedExpression;
+import com.google.dart.engine.html.ast.HtmlScriptTagNode;
+import com.google.dart.engine.html.ast.HtmlUnit;
+import com.google.dart.engine.html.ast.XmlAttributeNode;
+import com.google.dart.engine.html.ast.XmlTagNode;
+
+/**
+ * Instances of the class {@code EmbeddedDartVisitor} implement a recursive visitor for HTML files
+ * that will invoke another visitor on all embedded dart scripts and expressions.
+ */
+public class EmbeddedDartVisitor<R> implements XmlVisitor<R> {
+  /**
+   * The visitor used to visit embedded Dart code.
+   */
+  private ASTVisitor<R> dartVisitor;
+
+  /**
+   * Initialize a newly created visitor to visit all of the nodes in an HTML structure and to use
+   * the given visitor to visit all of the nodes representing any embedded scripts or expressions.
+   * 
+   * @param dartVisitor the visitor used to visit embedded Dart code
+   */
+  public EmbeddedDartVisitor(ASTVisitor<R> dartVisitor) {
+    this.dartVisitor = dartVisitor;
+  }
+
+  @Override
+  public R visitHtmlScriptTagNode(HtmlScriptTagNode node) {
+    node.visitChildren(this);
+    CompilationUnit script = node.getScript();
+    if (script != null) {
+      script.accept(dartVisitor);
+    }
+    return null;
+  }
+
+  @Override
+  public R visitHtmlUnit(HtmlUnit node) {
+    node.visitChildren(this);
+    return null;
+  }
+
+  @Override
+  public R visitXmlAttributeNode(XmlAttributeNode node) {
+    node.visitChildren(this);
+    for (EmbeddedExpression expression : node.getExpressions()) {
+      expression.getExpression().accept(dartVisitor);
+    }
+    return null;
+  }
+
+  @Override
+  public R visitXmlTagNode(XmlTagNode node) {
+    node.visitChildren(this);
+    for (EmbeddedExpression expression : node.getExpressions()) {
+      expression.getExpression().accept(dartVisitor);
+    }
+    return null;
+  }
+}