/*
* 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.engine.html.ast.visitor;
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.XmlNode;
import com.google.dart.engine.html.ast.XmlTagNode;
import com.google.dart.engine.html.scanner.Token;
import java.io.PrintWriter;
/**
* Instances of the class {@code ToSourceVisitor} write a source representation of a visited XML
* node (and all of it's children) to a writer.
*
* @coverage dart.engine.html
*/
public class ToSourceVisitor implements XmlVisitor<Void> {
/**
* The writer to which the source is to be written.
*/
private PrintWriter writer;
/**
* Initialize a newly created visitor to write source code representing the visited nodes to the
* given writer.
*
* @param writer the writer to which the source is to be written
*/
public ToSourceVisitor(PrintWriter writer) {
this.writer = writer;
}
@Override
public Void visitHtmlScriptTagNode(HtmlScriptTagNode node) {
return visitXmlTagNode(node);
}
@Override
public Void visitHtmlUnit(HtmlUnit node) {
for (XmlTagNode child : node.getTagNodes()) {
visit(child);
}
return null;
}
@Override
public Void visitXmlAttributeNode(XmlAttributeNode node) {
String name = node.getName();
Token value = node.getValueToken();
if (name.length() == 0) {
writer.print("__");
} else {
writer.print(name);
}
writer.print("=");
if (value == null) {
writer.print("__");
} else {
writer.print(value.getLexeme());
}
return null;
}
@Override
public Void visitXmlTagNode(XmlTagNode node) {
writer.print("<");
String tagName = node.getTag();
writer.print(tagName);
for (XmlAttributeNode attribute : node.getAttributes()) {
writer.print(" ");
visit(attribute);
}
writer.print(node.getAttributeEnd().getLexeme());
if (node.getClosingTag() != null) {
for (XmlTagNode child : node.getTagNodes()) {
visit(child);
}
writer.print("</");
writer.print(tagName);
writer.print(">");
}
return null;
}
/**
* Safely visit the given node.
*
* @param node the node to be visited
*/
private void visit(XmlNode node) {
if (node != null) {
node.accept(this);
}
}
}