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package org.apache.velocity.runtime.visitor;
/*
* 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.runtime.parser.Token;
import org.apache.velocity.runtime.parser.node.*;
/**
* This class is simply a visitor implementation
* that traverses the AST, produced by the Velocity
* parsing process, and creates a visual structure
* of the AST. This is primarily used for
* debugging, but it useful for documentation
* as well.
*
* @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
* @version $Id$
*/
public class NodeViewMode extends BaseVisitor
{
private int indent = 0;
private boolean showTokens = true;
/** Indent child nodes to help visually identify
* the structure of the AST.
*/
private String indentString()
{
StringBuilder sb = new StringBuilder();
for (int i = 0; i < indent; ++i)
{
sb.append(" ");
}
return sb.toString();
}
/**
* Display the type of nodes and optionally the
* first token.
*/
private Object showNode(Node node, Object data)
{
String tokens = "";
String special = "";
Token t;
if (showTokens)
{
// TODO: Token reference
t = node.getFirstToken();
if (t.specialToken != null && ! t.specialToken.image.startsWith(node.getParser().lineComment()))
special = t.specialToken.image;
tokens = " -> " + special + t.image;
}
System.out.println(indentString() + node + tokens);
++indent;
data = node.childrenAccept(this, data);
--indent;
return data;
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.SimpleNode, java.lang.Object)
*/
@Override
public Object visit(SimpleNode node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTprocess, java.lang.Object)
*/
@Override
public Object visit(ASTprocess node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTExpression, java.lang.Object)
*/
@Override
public Object visit(ASTExpression node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTAssignment, java.lang.Object)
*/
@Override
public Object visit(ASTAssignment node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTOrNode, java.lang.Object)
*/
@Override
public Object visit(ASTOrNode node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTAndNode, java.lang.Object)
*/
@Override
public Object visit(ASTAndNode node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTEQNode, java.lang.Object)
*/
@Override
public Object visit(ASTEQNode node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTNENode, java.lang.Object)
*/
@Override
public Object visit(ASTNENode node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTLTNode, java.lang.Object)
*/
@Override
public Object visit(ASTLTNode node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTGTNode, java.lang.Object)
*/
@Override
public Object visit(ASTGTNode node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTLENode, java.lang.Object)
*/
@Override
public Object visit(ASTLENode node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTGENode, java.lang.Object)
*/
@Override
public Object visit(ASTGENode node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTAddNode, java.lang.Object)
*/
@Override
public Object visit(ASTAddNode node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTSubtractNode, java.lang.Object)
*/
@Override
public Object visit(ASTSubtractNode node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTMulNode, java.lang.Object)
*/
@Override
public Object visit(ASTMulNode node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTDivNode, java.lang.Object)
*/
@Override
public Object visit(ASTDivNode node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTModNode, java.lang.Object)
*/
@Override
public Object visit(ASTModNode node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTNotNode, java.lang.Object)
*/
@Override
public Object visit(ASTNotNode node, Object data)
{
return showNode(node,data);
}
@Override
public Object visit(ASTNegateNode node, Object data) {
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTFloatingPointLiteral, java.lang.Object)
*/
@Override
public Object visit(ASTFloatingPointLiteral node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTIntegerLiteral, java.lang.Object)
* @since 1.5
*/
@Override
public Object visit(ASTIntegerLiteral node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTStringLiteral, java.lang.Object)
*/
@Override
public Object visit(ASTStringLiteral node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTIdentifier, java.lang.Object)
*/
@Override
public Object visit(ASTIdentifier node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTMethod, java.lang.Object)
*/
@Override
public Object visit(ASTMethod node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTReference, java.lang.Object)
*/
@Override
public Object visit(ASTReference node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTTrue, java.lang.Object)
*/
@Override
public Object visit(ASTTrue node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTFalse, java.lang.Object)
*/
@Override
public Object visit(ASTFalse node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTBlock, java.lang.Object)
*/
@Override
public Object visit(ASTBlock node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTText, java.lang.Object)
*/
@Override
public Object visit(ASTText node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTIfStatement, java.lang.Object)
*/
@Override
public Object visit(ASTIfStatement node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTElseStatement, java.lang.Object)
*/
@Override
public Object visit(ASTElseStatement node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTElseIfStatement, java.lang.Object)
*/
@Override
public Object visit(ASTElseIfStatement node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTObjectArray, java.lang.Object)
*/
@Override
public Object visit(ASTObjectArray node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTDirective, java.lang.Object)
*/
@Override
public Object visit(ASTDirective node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTWord, java.lang.Object)
*/
@Override
public Object visit(ASTWord node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTSetDirective, java.lang.Object)
*/
@Override
public Object visit(ASTSetDirective node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTEscapedDirective, java.lang.Object)
* @since 1.5
*/
@Override
public Object visit(ASTEscapedDirective node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTEscape, java.lang.Object)
* @since 1.5
*/
@Override
public Object visit(ASTEscape node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTMap, java.lang.Object)
* @since 1.5
*/
@Override
public Object visit(ASTMap node, Object data)
{
return showNode(node,data);
}
/**
* @see org.apache.velocity.runtime.visitor.BaseVisitor#visit(org.apache.velocity.runtime.parser.node.ASTIntegerRange, java.lang.Object)
*/
@Override
public Object visit(ASTIntegerRange node, Object data)
{
return showNode(node,data);
}
}
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