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1 /* |
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2 * Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: Compares W3C DOM Elements and CSS Selectors |
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15 * |
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16 */ |
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17 |
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18 |
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19 package com.nokia.tools.themeinstaller.cssparser; |
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20 |
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21 import java.util.Collection; |
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22 import java.util.Iterator; |
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23 |
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24 import org.w3c.css.sac.AttributeCondition; |
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25 import org.w3c.css.sac.CSSException; |
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26 import org.w3c.css.sac.CombinatorCondition; |
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27 import org.w3c.css.sac.Condition; |
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28 import org.w3c.css.sac.ConditionalSelector; |
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29 import org.w3c.css.sac.DescendantSelector; |
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30 import org.w3c.css.sac.ElementSelector; |
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31 import org.w3c.css.sac.Selector; |
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32 import org.w3c.dom.Element; |
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33 import org.w3c.dom.Node; |
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34 |
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35 /** |
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36 * The Class CSSMatchMaker compares W3C DOM Elements and CSS Selectors. Match |
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37 * method returns true if CSS Selector has style rules for the given DOM Element |
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38 */ |
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39 public class CSSMatchMaker |
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40 { |
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41 |
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42 /** The Constant STRING_CLASS. */ |
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43 private static final String STRING_CLASS = "class"; |
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44 |
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45 /** The Constant STRING_ID. */ |
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46 private static final String STRING_ID = "id"; |
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47 |
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48 /** The Constant STRING_SPACE. */ |
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49 private static final String STRING_SPACE = " "; |
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50 |
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51 /** The pseudo class resolver. */ |
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52 private PseudoClassResolver iPseudoClassResolver; |
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53 |
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54 /** |
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55 * Instantiates a new CSS Match Maker. |
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56 */ |
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57 public CSSMatchMaker() |
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58 { |
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59 iPseudoClassResolver = new PseudoClassResolver(); |
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60 } |
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61 |
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62 /** |
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63 * Compares if CSS rule with it's selector has style instructions for given |
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64 * DOM Element. |
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65 * |
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66 * @param aElement W3C DOM Element |
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67 * @param aRule The style rule |
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68 * |
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69 * @return true, if CSS Selector matches DOM Element |
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70 */ |
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71 public boolean match( CSSRule aRule, Element aElement ){ |
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72 aRule.resetSpecificity(); |
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73 return match( aRule.getSelector(), aRule.getSpecificity(), aElement ); |
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74 |
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75 } |
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76 |
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77 /** |
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78 * Compares if CSS rule's selector has style instructions for given DOM |
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79 * Element. |
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80 * |
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81 * @param aSelector the a selector |
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82 * @param aSpecificity CSSRules specificity table to be updated during the |
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83 * comparison |
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84 * @param aElement the a element |
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85 * |
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86 * @return true, if given selector match DOM Element |
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87 */ |
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88 private boolean match( Selector aSelector, CSSSpecificity aSpecificity, Element aElement ) |
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89 { |
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90 switch ( aSelector.getSelectorType() ) |
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91 { |
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92 case Selector.SAC_ELEMENT_NODE_SELECTOR: |
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93 { |
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94 ElementSelector eSelector = ( ElementSelector ) aSelector; |
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95 String name = eSelector.getLocalName(); |
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96 // if("box".equals(aElement.getLocalName())&& "box".equals(name) ){ |
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97 // System.out.println("!!!"); |
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98 // } |
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99 if ( name == null || name.equals( aElement.getLocalName() ) ) |
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100 { |
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101 aSpecificity.incElement(); |
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102 return true; |
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103 } |
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104 return false; |
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105 } |
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106 |
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107 case Selector.SAC_CONDITIONAL_SELECTOR: |
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108 { |
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109 ConditionalSelector cSelector = ( ConditionalSelector ) aSelector; |
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110 if ( !match( cSelector.getSimpleSelector(), aSpecificity, |
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111 aElement ) ) |
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112 { |
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113 return false; |
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114 } |
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115 return matchCondition( cSelector.getCondition(), aSpecificity, |
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116 aElement ); |
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117 } |
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118 |
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119 case Selector.SAC_CHILD_SELECTOR: |
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120 { |
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121 DescendantSelector dSelector = ( DescendantSelector ) aSelector; |
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122 if ( !match( dSelector.getSimpleSelector(), aSpecificity, |
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123 aElement ) ) |
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124 { |
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125 return false; |
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126 } |
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127 return match( dSelector.getAncestorSelector(), aSpecificity, |
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128 ( Element ) aElement.getParentNode() ); |
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129 } |
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130 case Selector.SAC_DESCENDANT_SELECTOR: |
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131 { |
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132 DescendantSelector dSelector = ( DescendantSelector ) aSelector; |
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133 if ( !match( dSelector.getSimpleSelector(), aSpecificity, |
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134 aElement ) ) |
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135 { |
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136 return false; |
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137 } |
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138 |
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139 Node ancestor = aElement; |
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140 while ( ( ancestor = ancestor.getParentNode() ) != null ) |
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141 { |
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142 if ( ancestor.getNodeType() == Node.ELEMENT_NODE ) |
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143 { |
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144 if ( match( dSelector.getAncestorSelector(), |
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145 aSpecificity, ( Element ) ancestor ) ) |
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146 { |
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147 return true; |
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148 } |
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149 } |
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150 } |
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151 return false; |
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152 } |
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153 case Selector.SAC_ANY_NODE_SELECTOR: |
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154 case Selector.SAC_DIRECT_ADJACENT_SELECTOR: |
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155 case Selector.SAC_CDATA_SECTION_NODE_SELECTOR: |
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156 case Selector.SAC_COMMENT_NODE_SELECTOR: |
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157 case Selector.SAC_NEGATIVE_SELECTOR: |
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158 case Selector.SAC_PROCESSING_INSTRUCTION_NODE_SELECTOR: |
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159 case Selector.SAC_PSEUDO_ELEMENT_SELECTOR: |
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160 case Selector.SAC_ROOT_NODE_SELECTOR: |
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161 case Selector.SAC_TEXT_NODE_SELECTOR: |
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162 { |
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163 throw new CSSException( "Selector : " |
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164 + aSelector.getSelectorType() + " not supported" ); |
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165 } |
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166 default: |
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167 throw new CSSException( "Unknown selector : " |
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168 + aSelector.getSelectorType() ); |
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169 } |
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170 } |
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171 |
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172 /** |
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173 * For Conditional Selectors, it is also necessary to check if selectors |
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174 * conditions match with the DOM Element. |
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175 * |
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176 * @param aCondition The condition of the conditional selector |
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177 * @param aElement The DOM element |
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178 * @param aSpecificity CSSRules specificity table to be updated during the |
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179 * comparison |
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180 * |
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181 * @return true, if given Condition match DOM Element |
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182 */ |
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183 private boolean matchCondition( Condition aCondition, |
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184 CSSSpecificity aSpecificity, Element aElement ) |
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185 { |
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186 switch ( aCondition.getConditionType() ) |
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187 { |
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188 case Condition.SAC_ID_CONDITION: |
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189 { |
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190 AttributeCondition idCondition = ( AttributeCondition ) aCondition; |
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191 String idAttribute = aElement.getAttribute( STRING_ID ); |
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192 |
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193 String[] idTexts = idAttribute.split( STRING_SPACE ); |
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194 |
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195 for ( int i = 0; i < idTexts.length; i++ ) |
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196 { |
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197 String idText = idTexts[ i ]; |
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198 if ( idAttribute != null |
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199 && idText.equals( idCondition.getValue() ) ) |
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200 { |
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201 aSpecificity.incID(); |
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202 return true; |
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203 } |
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204 } |
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205 return false; |
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206 } |
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207 |
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208 case Condition.SAC_CLASS_CONDITION: |
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209 { |
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210 AttributeCondition classCondition = ( AttributeCondition ) aCondition; |
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211 String classAttribute = aElement.getAttribute( STRING_CLASS ); |
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212 |
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213 String[] classTexts = classAttribute.split( STRING_SPACE ); |
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214 |
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215 for ( int i = 0; i < classTexts.length; i++ ) |
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216 { |
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217 String classText = classTexts[ i ]; |
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218 if ( classAttribute != null |
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219 && classText.equals( classCondition.getValue() ) ) |
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220 { |
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221 aSpecificity.incAttribute(); |
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222 return true; |
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223 } |
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224 } |
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225 return false; |
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226 } |
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227 |
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228 case Condition.SAC_AND_CONDITION: |
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229 { |
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230 CombinatorCondition combCondition = ( CombinatorCondition ) aCondition; |
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231 return matchCondition( combCondition.getFirstCondition(), |
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232 aSpecificity, aElement ) |
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233 && matchCondition( combCondition.getSecondCondition(), |
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234 aSpecificity, aElement ); |
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235 } |
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236 |
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237 case Condition.SAC_PSEUDO_CLASS_CONDITION: |
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238 { |
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239 Collection pseudoTypes = iPseudoClassResolver |
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240 .getPseudoTypes(); |
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241 |
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242 for ( Iterator it = pseudoTypes.iterator(); it |
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243 .hasNext(); ) |
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244 { |
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245 if ( it.next() |
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246 .equals( aCondition.toString().substring( 1 ) ) ) |
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247 { |
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248 aSpecificity.incAttribute(); |
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249 return true; |
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250 } |
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251 } |
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252 return false; |
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253 } |
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254 case Condition.SAC_ATTRIBUTE_CONDITION: |
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255 case Condition.SAC_ONE_OF_ATTRIBUTE_CONDITION: |
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256 case Condition.SAC_BEGIN_HYPHEN_ATTRIBUTE_CONDITION: |
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257 case Condition.SAC_OR_CONDITION: |
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258 case Condition.SAC_NEGATIVE_CONDITION: |
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259 case Condition.SAC_POSITIONAL_CONDITION: |
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260 case Condition.SAC_LANG_CONDITION: |
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261 case Condition.SAC_ONLY_CHILD_CONDITION: |
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262 case Condition.SAC_ONLY_TYPE_CONDITION: |
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263 case Condition.SAC_CONTENT_CONDITION: |
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264 { |
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265 throw new CSSException( "condition : " |
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266 + aCondition.getConditionType() + " not supported" ); |
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267 } |
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268 default: |
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269 throw new CSSException( "Unknown condition : " |
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270 + aCondition.getConditionType() ); |
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271 } |
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272 } |
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273 } |