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package org.apache.velocity.runtime.parser.node;
/*
* 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.context.InternalContextAdapter;
import org.apache.velocity.exception.MethodInvocationException;
import org.apache.velocity.exception.ParseErrorException;
import org.apache.velocity.exception.ResourceNotFoundException;
import org.apache.velocity.exception.TemplateInitException;
import org.apache.velocity.runtime.RuntimeConstants.SpaceGobbling;
import org.apache.velocity.runtime.parser.Parser;
import org.apache.velocity.runtime.parser.Token;
import java.io.IOException;
import java.io.Writer;
/**
* Please look at the Parser.jjt file which is
* what controls the generation of this class.
*
* @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
* @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
* @version $Id$
*/
public class ASTIfStatement extends SimpleNode
{
private String prefix = "";
private String postfix = "";
/*
* '#' and '$' prefix characters eaten by javacc MORE mode
*/
private String morePrefix = "";
/**
* @param id
*/
public ASTIfStatement(int id)
{
super(id);
}
/**
* @param p
* @param id
*/
public ASTIfStatement(Parser p, int id)
{
super(p, id);
}
/**
* @see org.apache.velocity.runtime.parser.node.SimpleNode#jjtAccept(org.apache.velocity.runtime.parser.node.ParserVisitor, java.lang.Object)
*/
@Override
public Object jjtAccept(ParserVisitor visitor, Object data)
{
return visitor.visit(this, data);
}
/**
* @throws TemplateInitException
* @see org.apache.velocity.runtime.parser.node.Node#init(org.apache.velocity.context.InternalContextAdapter, java.lang.Object)
*/
@Override
public Object init(InternalContextAdapter context, Object data) throws TemplateInitException
{
Object obj = super.init(context, data);
/*
* handle '$' and '#' chars prefix
*/
Token t = getFirstToken();
int pos = -1;
while (t != null && (pos = t.image.lastIndexOf(rsvc.getParserConfiguration().getHashChar())) == -1)
{
t = t.next;
}
if (t != null && pos > 0)
{
morePrefix = t.image.substring(0, pos);
}
/* handle structured space gobbling */
if (rsvc.getSpaceGobbling() == SpaceGobbling.STRUCTURED && postfix.length() > 0)
{
NodeUtils.fixIndentation(this, prefix);
}
cleanupParserAndTokens(); // drop reference to Parser and all JavaCC Tokens
return obj;
}
/**
* set indentation prefix
* @param prefix
*/
public void setPrefix(String prefix)
{
this.prefix = prefix;
}
/**
* get indentation prefix
* @return prefix
*/
public String getPrefix()
{
return prefix;
}
/**
* set indentation postfix
* @param postfix
*/
public void setPostfix(String postfix)
{
this.postfix = postfix;
}
/**
* get indentation postfix
* @return postfix
*/
public String getPostfix()
{
return postfix;
}
/**
* @see org.apache.velocity.runtime.parser.node.SimpleNode#render(org.apache.velocity.context.InternalContextAdapter, java.io.Writer)
*/
@Override
public boolean render(InternalContextAdapter context, Writer writer)
throws IOException,MethodInvocationException,
ResourceNotFoundException, ParseErrorException
{
SpaceGobbling spaceGobbling = rsvc.getSpaceGobbling();
if (morePrefix.length() > 0 || spaceGobbling.compareTo(SpaceGobbling.LINES) < 0)
{
writer.write(prefix);
}
writer.write(morePrefix);
/*
* Check if the #if(expression) construct evaluates to true:
*/
if (jjtGetChild(0).evaluate(context))
{
jjtGetChild(1).render(context, writer);
}
else
{
int totalNodes = jjtGetNumChildren();
/*
* Now check the remaining nodes left in the
* if construct. The nodes are either elseif
* nodes or else nodes. Each of these node
* types knows how to evaluate themselves. If
* a node evaluates to true then the node will
* render itself and this method will return
* as there is nothing left to do.
*/
for (int i = 2; i < totalNodes; i++)
{
if (jjtGetChild(i).evaluate(context))
{
jjtGetChild(i).render(context, writer);
break;
}
}
}
if (morePrefix.length() > 0 || spaceGobbling == SpaceGobbling.NONE)
{
writer.write(postfix);
}
/*
* This is reached without rendering anything (other than potential suffix/prefix) when an ASTIfStatement
* consists of an if/elseif sequence where none of the nodes evaluate to true.
*/
return true;
}
/**
* @param context
* @param visitor
*/
public void process( InternalContextAdapter context, ParserVisitor visitor)
{
}
}
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