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package org.apache.velocity.test.view;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* 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.
*/
import org.apache.velocity.Template;
import org.apache.velocity.runtime.RuntimeSingleton;
import org.apache.velocity.runtime.parser.node.SimpleNode;
import org.apache.velocity.runtime.visitor.NodeViewMode;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
/**
* Simple class for dumping the AST for a template.
* Good for debugging and writing new directives.
*/
public class TemplateNodeView
{
/**
* Root of the AST node structure that results from
* parsing a template.
*/
private SimpleNode document;
/**
* Visitor used to traverse the AST node structure
* and produce a visual representation of the
* node structure. Very good for debugging and
* writing new directives.
*/
private NodeViewMode visitor;
/**
* Default constructor: sets up the Velocity
* Runtime, creates the visitor for traversing
* the node structure and then produces the
* visual representation by the visitation.
*/
public TemplateNodeView(String templateFile)
{
try
{
RuntimeSingleton.init("velocity.properties");
InputStreamReader isr = new InputStreamReader(
new FileInputStream(templateFile),
RuntimeSingleton.getString(RuntimeSingleton.INPUT_ENCODING));
BufferedReader br = new BufferedReader( isr );
Template tmpl = new Template();
tmpl.setName(templateFile);
document = RuntimeSingleton.parse( br, tmpl);
visitor = new NodeViewMode();
visitor.setContext(null);
visitor.setWriter(new PrintWriter(System.out));
document.jjtAccept(visitor, null);
}
catch (Exception e)
{
System.out.println(e);
e.printStackTrace();
}
}
}
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