/** If the LINK refers to a stylesheet document, this method loads and parses it. */
protected void processLink() {
this.styleSheet = null;
String rel = this.getAttribute(HtmlAttributeProperties.REL);
if (rel != null) {
String cleanRel = rel.trim().toLowerCase();
boolean isStyleSheet = cleanRel.equals("stylesheet");
boolean isAltStyleSheet = cleanRel.equals("alternate stylesheet");
boolean isAppendixStyleSheet = cleanRel.equals("appendix stylesheet");
if (isStyleSheet || isAltStyleSheet || isAppendixStyleSheet) {
UserAgentContext uacontext = this.getUserAgentContext();
if (uacontext.isExternalCSSEnabled()) {
String media = this.getMedia();
if (CSSUtilities.matchesMedia(media, uacontext)) {
HTMLDocumentImpl doc = (HTMLDocumentImpl) this.getOwnerDocument();
try {
CSSStyleSheet sheet = CSSUtilities.parse(this.getHref(), doc);
CSSStyleSheetImpl sheetImpl = null;
if (sheet != null) {
doc.addStyleSheet(sheet);
this.styleSheet = sheet;
if (sheet instanceof CSSStyleSheetImpl) {
sheetImpl = (CSSStyleSheetImpl) sheet;
if (isAltStyleSheet) {
sheetImpl.setDisabled(true);
} else {
sheetImpl.setDisabled(disabled);
}
URL baseURL = new URL(doc.getBaseURI());
URL scriptURL = Urls.createURL(baseURL, getHref());
if (scriptURL != null) sheetImpl.setHref(scriptURL.toString());
doc.addStyleSheet(sheetImpl);
} else {
if (isAltStyleSheet) {
sheet.setDisabled(true);
} else {
sheet.setDisabled(this.disabled);
}
doc.addStyleSheet(sheet);
}
}
} catch (MalformedURLException mfe) {
this.warn(
"Will not parse CSS. URI=["
+ this.getHref()
+ "] with BaseURI=["
+ doc.getBaseURI()
+ "] does not appear to be a valid URI.");
} catch (Throwable err) {
this.warn("Unable to parse CSS. URI=[" + this.getHref() + "].", err);
}
}
}
}
}
}
/**
* Adds the rule.
*
* @param styleSheet the style sheet
* @param rule the rule
* @throws MalformedURLException the malformed url exception
* @throws UnsupportedEncodingException
*/
private final void addRule(CSSStyleSheet styleSheet, CSSRule rule)
throws MalformedURLException, UnsupportedEncodingException {
HTMLDocumentImpl document = this.document;
if (rule instanceof CSSStyleRule) {
CSSStyleRule sr = (CSSStyleRule) rule;
String selectorList = sr.getSelectorText();
StringTokenizer commaTok = new StringTokenizer(selectorList, ",");
while (commaTok.hasMoreTokens()) {
String selectorPart = commaTok.nextToken().toLowerCase();
ArrayList<SimpleSelector> simpleSelectors = null;
String lastSelectorText = null;
StringTokenizer tok = new StringTokenizer(selectorPart, " \t\r\n");
if (tok.hasMoreTokens()) {
simpleSelectors = new ArrayList<SimpleSelector>();
SimpleSelector prevSelector = null;
SELECTOR_FOR:
for (; ; ) {
String token = tok.nextToken();
if (">".equals(token)) {
if (prevSelector != null) {
prevSelector.setSelectorType(SimpleSelector.PARENT);
}
continue SELECTOR_FOR;
} else if ("+".equals(token)) {
if (prevSelector != null) {
prevSelector.setSelectorType(SimpleSelector.PRECEEDING_SIBLING);
}
continue SELECTOR_FOR;
}
int colonIdx = token.indexOf(':');
String simpleSelectorText = colonIdx == -1 ? token : token.substring(0, colonIdx);
String pseudoElement = colonIdx == -1 ? null : token.substring(colonIdx + 1);
prevSelector = new SimpleSelector(simpleSelectorText, pseudoElement);
simpleSelectors.add(prevSelector);
if (!tok.hasMoreTokens()) {
lastSelectorText = simpleSelectorText;
break;
}
}
}
if (lastSelectorText != null) {
int dotIdx = lastSelectorText.indexOf('.');
if (dotIdx != -1) {
String elemtl = lastSelectorText.substring(0, dotIdx);
String classtl = lastSelectorText.substring(dotIdx + 1);
this.addClassRule(elemtl, classtl, sr, simpleSelectors);
} else {
int poundIdx = lastSelectorText.indexOf('#');
if (poundIdx != -1) {
String elemtl = lastSelectorText.substring(0, poundIdx);
String idtl = lastSelectorText.substring(poundIdx + 1);
this.addIdRule(elemtl, idtl, sr, simpleSelectors);
} else {
String elemtl = lastSelectorText;
this.addElementRule(elemtl, sr, simpleSelectors);
}
}
}
}
// TODO: Attribute selectors
} else if (rule instanceof CSSImportRule) {
UserAgentContext uacontext = document.getUserAgentContext();
if (uacontext.isExternalCSSEnabled()) {
CSSImportRule importRule = (CSSImportRule) rule;
if (CSSUtilities.matchesMedia(importRule.getMedia(), uacontext)) {
String href = importRule.getHref();
CSSStyleSheet sheet = null;
try {
sheet = CSSUtilities.parse(href, document);
} catch (Exception err) {
logger.severe("Unable to parse CSS. URI=[" + href + "]." + err);
}
if (sheet != null) {
this.addStyleSheet(sheet);
}
}
}
} else if (rule instanceof CSSMediaRule) {
CSSMediaRule mrule = (CSSMediaRule) rule;
MediaList mediaList = mrule.getMedia();
if (CSSUtilities.matchesMedia(mediaList, document.getUserAgentContext())) {
CSSRuleList ruleList = mrule.getCssRules();
int length = ruleList.getLength();
for (int i = 0; i < length; i++) {
CSSRule subRule = ruleList.item(i);
this.addRule(styleSheet, subRule);
}
}
}
}