/*
* 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 java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.net.URL;
import java.util.Arrays;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.mozilla.javascript.Context;
import com.asual.lesscss.compiler.LessCompiler;
import com.asual.lesscss.compiler.RhinoCompiler;
import com.asual.lesscss.loader.ChainedResourceLoader;
import com.asual.lesscss.loader.ClasspathResourceLoader;
import com.asual.lesscss.loader.CssProcessingResourceLoader;
import com.asual.lesscss.loader.FilesystemResourceLoader;
import com.asual.lesscss.loader.HTTPResourceLoader;
import com.asual.lesscss.loader.JNDIResourceLoader;
import com.asual.lesscss.loader.ResourceLoader;
import com.asual.lesscss.loader.UnixNewlinesResourceLoader;
/**
* @author Rostislav Hristov
* @author Uriah Carpenter
* @author Noah Sloan
*/
public class LessEngine {
private final Log logger = LogFactory.getLog(getClass());
private final LessOptions options;
private final ResourceLoader loader;
private LessCompiler compiler;
public LessEngine() {
this(new LessOptions());
}
public LessEngine(LessOptions options) {
this(options, defaultResourceLoader(options));
}
private static ResourceLoader defaultResourceLoader(LessOptions options) {
ResourceLoader resourceLoader = new ChainedResourceLoader(
new FilesystemResourceLoader(), new ClasspathResourceLoader(
LessEngine.class.getClassLoader()),
new JNDIResourceLoader(), new HTTPResourceLoader());
if (options.isCss()) {
return new CssProcessingResourceLoader(resourceLoader);
}
resourceLoader = new UnixNewlinesResourceLoader(resourceLoader);
return resourceLoader;
}
public LessEngine(LessOptions options, ResourceLoader loader) {
this.options = options;
this.loader = loader;
try {
logger.debug("Initializing LESS Engine.");
ClassLoader classLoader = getClass().getClassLoader();
URL less = options.getLess();
URL env = classLoader.getResource("META-INF/env.js");
URL engine = classLoader.getResource("META-INF/engine.js");
URL cssmin = classLoader.getResource("META-INF/cssmin.js");
URL sourceMap = classLoader.getResource("META-INF/source-map.js");
compiler = new RhinoCompiler(options, loader, less, env, engine, cssmin, sourceMap);
Context.exit();
} catch (Exception e) {
logger.error("LESS Engine intialization failed.", e);
}
}
public String compile(String input) throws LessException {
return compile(input, null, false);
}
public String compile(String input, String location) throws LessException {
return compile(input, location, false);
}
public String compile(String input, String location, boolean compress)
throws LessException {
long time = System.currentTimeMillis();
String result = compiler.compile(input, location == null ? "" : location, compress);
logger.debug("The compilation of '" + input + "' took "
+ (System.currentTimeMillis() - time) + " ms.");
return result;
}
public String compile(URL input) throws LessException, IOException {
return compile(input, false);
}
public String compile(URL input, boolean compress) throws LessException, IOException {
long time = System.currentTimeMillis();
String location = input.toString();
logger.debug("Compiling URL: " + location);
String source = loader.load(getFile(location), getPaths(location), options.getCharset());
String result = compiler.compile(source, location, compress);
logger.debug("The compilation of '" + input + "' took "
+ (System.currentTimeMillis() - time) + " ms.");
return result;
}
public String compile(File input) throws LessException, IOException {
return compile(input, false);
}
public String compile(File input, boolean compress) throws LessException, IOException {
long time = System.currentTimeMillis();
String location = input.getAbsolutePath();
logger.debug("Compiling File: " + "file:" + location);
String source = null;
source = loader.load(getFile(location), getPaths(location), options.getCharset());
String result = compiler.compile(source, location, compress);
logger.debug("The compilation of '" + input + "' took "
+ (System.currentTimeMillis() - time) + " ms.");
return result;
}
public void compile(File input, File output) throws LessException,
IOException {
compile(input, output, false);
}
public void compile(File input, File output, boolean compress)
throws LessException, IOException {
String content = compile(input, compress);
if (!output.exists()) {
output.createNewFile();
}
BufferedWriter bw = new BufferedWriter(new FileWriter(output));
bw.write(content);
bw.close();
}
private String[] getPaths(String currentFile) {
String[] paths;
if(options.getPaths() != null) {
paths = Arrays.copyOf(options.getPaths(), options.getPaths().length + 1);
} else {
paths = new String[1];
}
String currentPath = currentFile.replaceAll("^(.*[\\/\\\\])[^\\/\\\\]*$", "$1");
paths[paths.length - 1] = currentPath;
for(int i = 0; i < paths.length; i++) {
paths[i] = paths[i].replace('\\', '/');
}
return paths;
}
private String getFile(String currentFile) {
String file = currentFile.replaceAll("^(.*[\\/\\\\])([^\\/\\\\]*)$", "$2");
return file;
}
}