StyleParser.java

/**
 * Copyright (C) 2012 alanhay <alanhay99@hotmail.com>
 *
 * 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 uk.co.certait.htmlexporter.css;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

import com.osbcp.cssparser.CSSParser;
import com.osbcp.cssparser.Rule;
import com.osbcp.cssparser.Selector;

public class StyleParser {
	private StyleGenerator generator;

	public StyleParser() {
		generator = new StyleGenerator();
	}

	public Map<String, Style> parseStyles(Elements elements) {
		Map<String, Style> styles = new HashMap<>();

		for (Element element : elements) {
			try {
				List<Rule> rules = CSSParser.parse(element.data());
				mapStyles(rules, styles);
			} catch (Exception e) {
				throw new RuntimeException(e);
			}
		}

		return styles;
	}

	protected void mapStyles(List<Rule> rules, Map<String, Style> styles) {
		for (Rule rule : rules) {
			for (Selector selector : rule.getSelectors()) {
				Style style = generator.createStyle(rule, selector);

				if (styles.containsKey(selector.toString())) {
					Style merged = StyleMerger.mergeStyles(styles.get(selector.toString()), style);
					styles.put(selector.toString(), merged);
				} else {
					styles.put(selector.toString(), style);
				}
			}
		}
	}
}