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1 package org.joshy.html.css;
2
3 import org.joshy.u;
4 import java.io.*;
5 import java.util.List  ;
6 import org.w3c.dom.*;
7 import org.w3c.dom.css.*;
8 import org.w3c.css.sac.*;
9 import com.steadystate.css.*;
10 import com.steadystate.css.parser.*;
11
12
13 public class RuleFinder {
14 List styles;
15 public RuleFinder(List styles) {
16 this.styles = styles;
17 }
18
19
20
21 public CSSStyleDeclaration findRule(Node elem, String property, boolean inherit) {
22 for(int s=styles.size()-1; s>=0; s--) {
24 JStyle style = (JStyle)styles.get(s);
25 for(int i=0; i<style.selector_list.getLength(); i++) {
27 Selector sel = style.selector_list.item(i);
28 if(matchSelector(sel,elem)) {
30 CSSStyleDeclaration dec = style.declaration;
31 if(dec != null && dec.getPropertyValue(property) != null &&
33 !dec.getPropertyValue(property).equals("")) {
34 return dec;
35 }
36 }
37 }
38 }
39
40 if(inherit) {
42 if(elem.getParentNode() != null) {
43 return findRule(elem.getParentNode(),property,inherit);
44 }
45 }
46
47 return null;
49 }
50
51
52
53 public boolean match(String selector, Node node) {
54 try {
55 CSSOMParser parser = new CSSOMParser();
56 SelectorList list = parser.parseSelectors(new InputSource(new StringReader(selector)));
57 for(int i=0; i<list.getLength(); i++) {
58 Selector sel = list.item(i);
59 if(matchSelector(sel,node)) {
60 return true;
61 }
62 }
63 } catch (Exception ex) {
64 u.p(ex);
65 }
66 return false;
67 }
68
69
70
71 private boolean matchSelector(Selector selector, Node node) {
72 if(selector.getSelectorType() == selector.SAC_ELEMENT_NODE_SELECTOR) {
73 return matchElement((ElementSelector)selector,node);
74 }
75 if(selector.getSelectorType() == selector.SAC_CONDITIONAL_SELECTOR) {
76 ConditionalSelector cond_sel = (ConditionalSelector)selector;
77 return matchConditional(cond_sel,node);
78 }
79 if(selector.getSelectorType() == selector.SAC_DESCENDANT_SELECTOR) {
80 DescendantSelector desc_sel = (DescendantSelector)selector;
81 return matchDescendant(desc_sel,node);
82 }
83 u.p("unrecognized selector type: " + selector + " node = " + node.getNodeName());
84 return false;
85 }
86
87
88
89 private boolean matchElement(ElementSelector selector, Node node) {
90 if(selector.getLocalName() == null) {
92 return true;
93 }
94 if(selector.getLocalName().equals(node.getNodeName())) {
95 return true;
96 }
97 return false;
98 }
99
100
101 private boolean matchConditional(ConditionalSelector selector, Node node) {
102 Condition cond = selector.getCondition();
103 if(cond.getConditionType() == cond.SAC_CLASS_CONDITION) {
104 return matchClassConditional((AttributeCondition)cond,selector.getSimpleSelector(),node);
105 }
106 if(cond.getConditionType() == cond.SAC_ID_CONDITION) {
107 return matchIDConditional((AttributeCondition)cond,selector.getSimpleSelector(),node);
108 }
109 return false;
110 }
111
112
113 private boolean matchDescendant(DescendantSelector selector, Node node) {
114 SimpleSelector child = selector.getSimpleSelector();
115 Selector parent = selector.getAncestorSelector();
116 if(matchSelector(child,node)) {
117 Node current_node = node;
119 while(true) {
120 Node parent_node = current_node.getParentNode();
121 if(parent_node == null) {
122 return false;
123 }
124 if(matchSelector(parent,parent_node)) {
125 return true;
126 }
127 current_node = parent_node;
128 }
129 }
130 return false;
131 }
132
133
134 private boolean matchClassConditional(AttributeCondition cond, SimpleSelector sel, Node node) {
135 if(!(node.getNodeType() == node.ELEMENT_NODE)) {
137 return false;
138 }
139 Element elem = (Element)node;
140 if(!elem.hasAttribute("class")) {
142 return false;
143 }
144 if(!elem.getAttribute("class").equals(cond.getValue())) {
146 return false;
147 }
148
149 ElementSelector es = (ElementSelector)sel;
152 if(es.getLocalName() == null) {
153 return true;
154 }
155 if(!((ElementSelector)sel).getLocalName().equals(node.getNodeName())) {
156 return false;
157 }
158 return true;
159 }
160
161 private boolean matchIDConditional(AttributeCondition cond, SimpleSelector sel, Node node) {
162 if(!(node.getNodeType() == node.ELEMENT_NODE)) { return false; }
164 Element elem = (Element)node;
165 if(!elem.hasAttribute("id")) { return false; }
167 if(!elem.getAttribute("id").equals(cond.getValue())) { return false; }
169
170 ElementSelector es = (ElementSelector)sel;
172 if(es.getLocalName() == null) {
175 return true;
176 }
177 if(!((ElementSelector)sel).getLocalName().equals(node.getNodeName())) { return false; }
178 return true;
179 }
180 }
181 |
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