1 /*

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

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

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

     6 * which accompanies this distribution, and is available

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

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

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

    15  *

    16 */

    17 

    18 

    19 package com.nokia.tools.themeinstaller.cssparser;

    20 

    21 import org.w3c.css.sac.CSSException;

    22 import org.w3c.css.sac.CombinatorCondition;

    23 import org.w3c.css.sac.Condition;

    24 import org.w3c.css.sac.ConditionalSelector;

    25 import org.w3c.css.sac.DescendantSelector;

    26 import org.w3c.css.sac.Selector;

    27 

    28 /**

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

    30 

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

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

    33  * SAC_AND_CONDITION.

    34  *

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

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

    37  * Selector

    38  *

    39  */

    40 public class CSSSelectorParser

    41     {

    42 

    43     /**

    44      * Checks if Selector is pseudo selector.

    45      *

    46      * @param aSelector The selector

    47      *

    48      * @return true, if is pseudo selector

    49      */

    50     public static boolean isPseudo( Selector aSelector )

    51         {

    52         switch ( aSelector.getSelectorType() )

    53             {

    54             case Selector.SAC_ELEMENT_NODE_SELECTOR:

    55                 {

    56                 return false;

    57                 }

    58             case Selector.SAC_CONDITIONAL_SELECTOR:

    59                 {

    60                 ConditionalSelector cSelector = ( ConditionalSelector ) aSelector;

    61                 return isPseudoCondition( cSelector.getCondition() );

    62                 }

    63             case Selector.SAC_CHILD_SELECTOR:

    64                 {

    65                 DescendantSelector dSelector = ( DescendantSelector ) aSelector;

    66                 return isPseudo( dSelector.getSimpleSelector() );

    67                 }

    68             case Selector.SAC_DESCENDANT_SELECTOR:

    69                 {

    70                 DescendantSelector dSelector = ( DescendantSelector ) aSelector;

    71                 return isPseudo( dSelector.getSimpleSelector() );

    72                 }

    73             case Selector.SAC_ANY_NODE_SELECTOR:

    74             case Selector.SAC_DIRECT_ADJACENT_SELECTOR:

    75             case Selector.SAC_CDATA_SECTION_NODE_SELECTOR:

    76             case Selector.SAC_COMMENT_NODE_SELECTOR:

    77             case Selector.SAC_NEGATIVE_SELECTOR:

    78             case Selector.SAC_PROCESSING_INSTRUCTION_NODE_SELECTOR:

    79             case Selector.SAC_PSEUDO_ELEMENT_SELECTOR:

    80             case Selector.SAC_ROOT_NODE_SELECTOR:

    81             case Selector.SAC_TEXT_NODE_SELECTOR:

    82                 {

    83                 throw new CSSException( "Selector : "

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

    85                 }

    86             default:

    87                 throw new CSSException( "Unknown selector : "

    88                         + aSelector.getSelectorType() );

    89             }

    90         }

    91 

    92     /**

    93      * Checks if SAC Condition is pseudo condition.

    94      *

    95      * @param aCondition The condition

    96      *

    97      * @return true, if is pseudo condition

    98      */

    99     private static boolean isPseudoCondition( Condition aCondition )

   100         {

   101         switch ( aCondition.getConditionType() )

   102             {

   103             case Condition.SAC_ID_CONDITION:

   104                 {

   105                 return false;

   106                 }

   107             case Condition.SAC_CLASS_CONDITION:

   108                 {

   109                 return false;

   110                 }

   111             case Condition.SAC_AND_CONDITION:

   112                 {

   113                 CombinatorCondition combCondition = ( CombinatorCondition ) aCondition;

   114                 return isPseudoCondition( combCondition.getFirstCondition() )

   115                         || isPseudoCondition( combCondition

   116                                 .getSecondCondition() );

   117                 }

   118             case Condition.SAC_PSEUDO_CLASS_CONDITION:

   119                 {

   120                 return true;

   121                 }

   122             case Condition.SAC_ATTRIBUTE_CONDITION:

   123             case Condition.SAC_ONE_OF_ATTRIBUTE_CONDITION:

   124             case Condition.SAC_BEGIN_HYPHEN_ATTRIBUTE_CONDITION:

   125             case Condition.SAC_OR_CONDITION:

   126             case Condition.SAC_NEGATIVE_CONDITION:

   127             case Condition.SAC_POSITIONAL_CONDITION:

   128             case Condition.SAC_LANG_CONDITION:

   129             case Condition.SAC_ONLY_CHILD_CONDITION:

   130             case Condition.SAC_ONLY_TYPE_CONDITION:

   131             case Condition.SAC_CONTENT_CONDITION:

   132                 {

   133                 throw new CSSException( "condition : "

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

   135 

   136                 }

   137             default:

   138                 throw new CSSException( "Unknown condition : "

   139                         + aCondition.getConditionType() );

   140             }

   141         }

   142     }