/*
* Parse a selector group (eg. E, F, G). In many/most cases there will be only one entry.
*/
private List<Selector> parseSelectorGroup(CSSTextScanner scan) throws SAXException {
if (scan.empty()) return null;
ArrayList<Selector> selectorGroup = new ArrayList<Selector>(1);
Selector selector = new Selector();
while (!scan.empty()) {
if (scan.nextSimpleSelector(selector)) {
// If there is a comma, keep looping, otherwise break
if (!scan.skipCommaWhitespace())
continue; // if not a comma, go back and check for next part of selector
selectorGroup.add(selector);
selector = new Selector();
} else break;
}
if (!selector.isEmpty()) selectorGroup.add(selector);
return selectorGroup;
}
/*
* Scans for a CSS 'simple selector'.
* Returns true if it found one.
* Returns false if there was an error or the input is empty.
*/
public boolean nextSimpleSelector(Selector selector) throws SAXException {
if (empty()) return false;
int start = position;
Combinator combinator = null;
SimpleSelector selectorPart = null;
if (!selector.isEmpty()) {
if (consume('>')) {
combinator = Combinator.CHILD;
skipWhitespace();
} else if (consume('+')) {
combinator = Combinator.FOLLOWS;
skipWhitespace();
}
}
if (consume('*')) {
selectorPart = new SimpleSelector(combinator, null);
} else {
String tag = nextIdentifier();
if (tag != null) {
selectorPart = new SimpleSelector(combinator, tag);
selector.addedElement();
}
}
while (!empty()) {
if (consume('.')) {
// ".foo" is equivalent to *[class="foo"]
if (selectorPart == null) selectorPart = new SimpleSelector(combinator, null);
String value = nextIdentifier();
if (value == null)
throw new SAXException("Invalid \".class\" selector in <style> element");
selectorPart.addAttrib(CLASS, AttribOp.EQUALS, value);
selector.addedAttributeOrPseudo();
continue;
}
if (consume('#')) {
// "#foo" is equivalent to *[id="foo"]
if (selectorPart == null) selectorPart = new SimpleSelector(combinator, null);
String value = nextIdentifier();
if (value == null) throw new SAXException("Invalid \"#id\" selector in <style> element");
selectorPart.addAttrib(ID, AttribOp.EQUALS, value);
selector.addedIdAttribute();
}
if (selectorPart == null) break;
// Now check for attribute selection and pseudo selectors
if (consume('[')) {
skipWhitespace();
String attrName = nextIdentifier();
String attrValue = null;
if (attrName == null)
throw new SAXException("Invalid attribute selector in <style> element");
skipWhitespace();
AttribOp op = null;
if (consume('=')) op = AttribOp.EQUALS;
else if (consume("~=")) op = AttribOp.INCLUDES;
else if (consume("|=")) op = AttribOp.DASHMATCH;
if (op != null) {
skipWhitespace();
attrValue = nextAttribValue();
if (attrValue == null)
throw new SAXException("Invalid attribute selector in <style> element");
skipWhitespace();
}
if (!consume(']'))
throw new SAXException("Invalid attribute selector in <style> element");
selectorPart.addAttrib(attrName, (op == null) ? AttribOp.EXISTS : op, attrValue);
selector.addedAttributeOrPseudo();
continue;
}
if (consume(':')) {
// skip pseudo
int pseudoStart = position;
if (nextIdentifier() != null) {
if (consume('(')) {
skipWhitespace();
if (nextIdentifier() != null) {
skipWhitespace();
if (!consume(')')) {
position = pseudoStart - 1;
break;
}
}
}
selectorPart.addPseudo(input.substring(pseudoStart, position));
selector.addedAttributeOrPseudo();
}
}
break;
}
if (selectorPart != null) {
selector.add(selectorPart);
return true;
}
// Otherwise 'fail'
position = start;
return false;
}