/*
* Copyright 2013 LMAX Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.freud.analysed.css.jdom;
import org.antlr.runtime.ANTLRReaderStream;
import org.antlr.runtime.CommonTokenStream;
import org.antlr.runtime.RecognitionException;
import org.apache.commons.jxpath.JXPathContext;
import org.freud.analysed.css.parser.CssLexer;
import org.freud.analysed.css.parser.CssParser;
import org.freud.analysed.css.parser.CssTokenType;
import org.freud.analysed.css.rule.CssRule;
import org.freud.core.parser.JdomTreeAdaptor;
import org.freud.core.parser.TokenType;
import org.jdom.Document;
import org.jdom.Element;
import java.io.IOException;
import java.io.Reader;
import java.util.ArrayList;
import java.util.List;
final class CssJdomParser {
private static final String CSS_ROOT_ELEMENT_NAME = "CSS";
private static final TokenType[] CSS_TOKEN_TYPES = CssTokenType.values();
private CssJdomParser() {
// static utility
}
@SuppressWarnings("unchecked")
static Iterable<CssRule> parseCssRules(final Reader reader) throws RecognitionException, IOException {
List<CssRule> cssRuleList = new ArrayList<CssRule>();
Document root = parseCssToDocument(reader);
JXPathContext context = JXPathContext.newContext(root.getRootElement());
List<Element> cssRuleElementList = (List<Element>) context.selectNodes("/RULE");
for (Element element : cssRuleElementList) {
final CssRuleJdom cssRuleJdom = new CssRuleJdom(element, 0);
cssRuleList.add(cssRuleJdom);
for (int i = 1; i < cssRuleJdom.getNumberOfCommaSeparatedSelectorLists(); i++) {
cssRuleList.add(new CssRuleJdom(element, i));
}
}
return cssRuleList;
}
private static Document parseCssToDocument(final Reader reader) throws RecognitionException, IOException {
CssParser parser = new CssParser(new CommonTokenStream(new CssLexer(new ANTLRReaderStream(reader))));
final JdomTreeAdaptor treeAdaptor = new JdomTreeAdaptor(CSS_ROOT_ELEMENT_NAME, CSS_TOKEN_TYPES);
parser.setTreeAdaptor(treeAdaptor);
parser.stylesheet();
return treeAdaptor.getDocument();
}
}