<?php
/**
 * File containing the ezcTemplateExpressionTstNode class
 *
 * 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.
 *
 * @package Template
 * @version //autogen//
 * @license http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
 * @access private
 */
/**
 * Interface for expression nodes in parser trees.
 *
 * @package Template
 * @version //autogen//
 * @access private
 */
abstract class ezcTemplateExpressionTstNode extends ezcTemplateTstNode
{
    /**
     * Constructs a new ezcTemplateExpressionTstNode
     *
     * @param ezcTemplateSourceCode $source
     * @param ezcTemplateCursor $start
     * @param ezcTemplateCursor $end
     */
    public function __construct( ezcTemplateSourceCode $source, /*ezcTemplateCursor*/ $start, /*ezcTemplateCursor*/ $end )
    {
        parent::__construct( $source, $start, $end );
    }

    /**
     * Returns false since expression nodes can never be children of blocks.
     *
     * @param ezcTemplateBlockTstNode $block
     * @return true
     */
    public function canBeChildOf( ezcTemplateBlockTstNode $block )
    {
        // Expression nodes can never be children of blocks,
        // these nodes should only be used inside expressions
        return false;
    }

    /**
     * {@inheritdoc}
     * Returns the column of the starting cursor.
     */
    public function minimumWhitespaceColumn()
    {
        return $this->startCursor->column;
    }

}
?>