/*

* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Parses SAC selector to find out its selector type

 *

*/

package com.nokia.tools.themeinstaller.cssparser;

import org.w3c.css.sac.CSSException;

import org.w3c.css.sac.CombinatorCondition;

import org.w3c.css.sac.Condition;

import org.w3c.css.sac.ConditionalSelector;

import org.w3c.css.sac.DescendantSelector;

import org.w3c.css.sac.Selector;

/**

 * Parses SAC Selector in order to find out if selector has pseudo condition.

 * For example selector "element.class:pseudo" is recognized as Conditional

 * Selector and the Selector's condition is ".class:pseudo" is recognized as

 * SAC_AND_CONDITION.

 *

 * After SAC_AND_CONDITION is parsed to two different conditions : ".class" and

 * ":pseudo", it is possible to tell that the original selector is Pseudo

 * Selector

 *

 */

public class CSSSelectorParser

    {

    /**

     * Checks if Selector is pseudo selector.

     *

     * @param aSelector The selector

     *

     * @return true, if is pseudo selector

     */

    public static boolean isPseudo( Selector aSelector )

        {

        switch ( aSelector.getSelectorType() )

            {

            case Selector.SAC_ELEMENT_NODE_SELECTOR:

                {

                return false;

                }

            case Selector.SAC_CONDITIONAL_SELECTOR:

                {

                ConditionalSelector cSelector = ( ConditionalSelector ) aSelector;

                return isPseudoCondition( cSelector.getCondition() );

                }

            case Selector.SAC_CHILD_SELECTOR:

                {

                DescendantSelector dSelector = ( DescendantSelector ) aSelector;

                return isPseudo( dSelector.getSimpleSelector() );

                }

            case Selector.SAC_DESCENDANT_SELECTOR:

                {

                DescendantSelector dSelector = ( DescendantSelector ) aSelector;

                return isPseudo( dSelector.getSimpleSelector() );

                }

            case Selector.SAC_ANY_NODE_SELECTOR:

            case Selector.SAC_DIRECT_ADJACENT_SELECTOR:

            case Selector.SAC_CDATA_SECTION_NODE_SELECTOR:

            case Selector.SAC_COMMENT_NODE_SELECTOR:

            case Selector.SAC_NEGATIVE_SELECTOR:

            case Selector.SAC_PROCESSING_INSTRUCTION_NODE_SELECTOR:

            case Selector.SAC_PSEUDO_ELEMENT_SELECTOR:

            case Selector.SAC_ROOT_NODE_SELECTOR:

            case Selector.SAC_TEXT_NODE_SELECTOR:

                {

                throw new CSSException( "Selector : "

                        + aSelector.getSelectorType() + " not supported" );

                }

            default:

                throw new CSSException( "Unknown selector : "

                        + aSelector.getSelectorType() );

            }

        }

    /**

     * Checks if SAC Condition is pseudo condition.

     *

     * @param aCondition The condition

     *

     * @return true, if is pseudo condition

     */

    private static boolean isPseudoCondition( Condition aCondition )

        {

        switch ( aCondition.getConditionType() )

            {

            case Condition.SAC_ID_CONDITION:

                {

                return false;

                }

            case Condition.SAC_CLASS_CONDITION:

                {

                return false;

                }

            case Condition.SAC_AND_CONDITION:

                {

                CombinatorCondition combCondition = ( CombinatorCondition ) aCondition;

                return isPseudoCondition( combCondition.getFirstCondition() )

                        || isPseudoCondition( combCondition

                                .getSecondCondition() );

                }

            case Condition.SAC_PSEUDO_CLASS_CONDITION:

                {

                return true;

                }

            case Condition.SAC_ATTRIBUTE_CONDITION:

            case Condition.SAC_ONE_OF_ATTRIBUTE_CONDITION:

            case Condition.SAC_BEGIN_HYPHEN_ATTRIBUTE_CONDITION:

            case Condition.SAC_OR_CONDITION:

            case Condition.SAC_NEGATIVE_CONDITION:

            case Condition.SAC_POSITIONAL_CONDITION:

            case Condition.SAC_LANG_CONDITION:

            case Condition.SAC_ONLY_CHILD_CONDITION:

            case Condition.SAC_ONLY_TYPE_CONDITION:

            case Condition.SAC_CONTENT_CONDITION:

                {

                throw new CSSException( "condition : "

                        + aCondition.getConditionType() + " not supported" );

                }

            default:

                throw new CSSException( "Unknown condition : "

                        + aCondition.getConditionType() );

            }

        }

    }