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A Servlet wrapper for LESS (http://lesscss.org). LESS extends CSS with: variables, mixins, operations and nested rules.

There is a newer version: 1.5.0

/*
 * 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 com.asual.lesscss;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.servlet.ServletContext;

/**
 * @author Rostislav Hristov
 */
public class LessResource extends StyleResource {
	
	private final Log logger = LogFactory.getLog(getClass());
	private LessEngine engine;
	
	public LessResource(LessEngine engine, ServletContext servletContext, String uri, String charset, boolean cache, boolean compress) throws ResourceNotFoundException {
		super(servletContext, uri, charset, cache, compress);
		this.engine = engine;
	}
	
	public byte[] getContent() throws LessException, IOException {
		if (content == null || (!cache && lastModified < getLastModified())) {
			logger.debug("Not using cache.");
			if (engine != null) {
				logger.debug("LessEngine available, compiling.");
				content = (resource instanceof URL ? 
						engine.compile((URL) resource) : engine.compile((File) resource))
						.replaceAll("\\\\n", "\n").getBytes(charset);
			} else {
				logger.debug("LessEngine not available, treating as regular resource.");
				content = resource instanceof URL ? ResourceUtils.readTextUrl((URL) resource, charset) : ResourceUtils.readTextFile((File) resource, charset);
			}
			lastModified = getLastModified();
			if (compress) {
				logger.debug("Compressing resource.");
				compress();
			}
		} else {
			logger.debug("Using cache, since lastModified: " + lastModified + " and getLastModified: " + getLastModified());
		}
		return content;
	}

	public long getLastModified() throws IOException {
		if (lastModified == null || !cache) {		
			lastModified = super.getLastModified();
			String content = new String(resource instanceof URL ? ResourceUtils.readTextUrl((URL) resource, charset) : ResourceUtils.readTextFile((File) resource, charset));
			String folder = path.substring(0, path.lastIndexOf(System.getProperty("file.separator")) + 1);
			Pattern p = Pattern.compile("@import\\s+(\"[^\"]*\"|'[^']*')");
			Matcher m = p.matcher(content);
			while (m.find()) {
				String path = folder + m.group(1).replaceAll("\"|'", "");
				File includedFile = new File(path);
				if (!includedFile.exists()) {
					includedFile = new File(path + ".less");
				}
				long importLastModified = includedFile.lastModified();
				if (importLastModified > lastModified) {
					lastModified = importLastModified;
				}
			}
		}
		logger.debug("getLastModified() in LessResource: " + lastModified);
		return lastModified;
	}
	
}