Template/src/parsers/tst_to_ast/implementations/output_variable_manager.php

<?php
/**
 * File containing the ezcTemplateOutputVariableManager 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
 */
/**
 * Keeps a stack of VariableAstNodes.
 *
 * @package Template
 * @version //autogen//
 * @access private
 */
class ezcTemplateOutputVariableManager
{
    private $outputVariables = array();
    private $stackSize = 0;

    public function __construct( $initialValue = null )
    {
        if ( is_object( $initialValue ) &&
             $initialValue instanceof ezcTemplateAstNode )
        {
            $this->initialValue = $initialValue;
        }
        else
        {
            $this->initialValue = new ezcTemplateLiteralAstNode( $initialValue );
        }
    }

    public function push( $name, $astNode = null )
    {
        if ( $astNode === null )
        {
            $astNode = new ezcTemplateVariableAstNode( $name );

            $symbolTable = ezcTemplateSymbolTable::getInstance();
            if ( $symbolTable->getTypeHint( $name ) == false )
            {
                $astNode->typeHint = ezcTemplateAstNode::TYPE_ARRAY | ezcTemplateAstNode::TYPE_VALUE;
            }
            else
            {
                // Will this work, values from this function is different than AST constants?
                $astNode->typeHint = $symbolTable->getTypeHint( $name );
            }
        }
        array_push( $this->outputVariables, array( 'name'    => $name,
                                                   'ast'     => $astNode,
                                                   'is_used' => false ) );
        ++$this->stackSize;
    }

    public function pop()
    {
        if ( count( $this->outputVariables ) == 0 )
        {
            throw new ezcTemplateInternalException( "Attempted pop() on an empty stack of variables" );
        }

        array_pop( $this->outputVariables );
        --$this->stackSize;
    }

    public function getName()
    {
        return $this->outputVariables[$this->stackSize - 1]['name'];
    }

    public function getAst()
    {
        $this->outputVariables[$this->stackSize - 1]['is_used'] = true;
        return clone $this->outputVariables[$this->stackSize - 1]['ast'];
    }

    public function isUsed()
    {
        return $this->outputVariables[$this->stackSize - 1]['is_used'];
    }

    public function getInitializationAst()
    {
        return new ezcTemplateGenericStatementAstNode(
            new ezcTemplateAssignmentOperatorAstNode( $this->getAst(),
                                                      clone $this->initialValue )
            );
    }

    public function getConcatAst( $concatValue )
    {
        return new ezcTemplateGenericStatementAstNode(
            new ezcTemplateConcatAssignmentOperatorAstNode( $this->getAst(),
                                                            $concatValue )
            );
    }


}


?>