/*
* 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.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.net.URL;
import java.util.logging.Level;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.servlet.ServletContext;
import com.google.javascript.jscomp.CompilationLevel;
import com.google.javascript.jscomp.Compiler;
import com.google.javascript.jscomp.CompilerOptions;
import com.google.javascript.jscomp.JSSourceFile;
import com.google.javascript.jscomp.Result;
/**
* @author Rostislav Hristov
*/
public class ScriptResource extends Resource {
protected boolean compress;
public ScriptResource(ServletContext servletContext, String uri, String charset, boolean cache, boolean compress) throws ResourceNotFoundException {
super(servletContext, uri, charset, cache);
this.compress = compress;
}
public byte[] getContent() throws IOException {
if (content == null || (content != null && !cache && lastModified < getLastModified())) {
content = resource instanceof URL ? ResourceUtils.readTextUrl((URL) resource, charset) : ResourceUtils.readTextFile((File) resource, charset);
lastModified = getLastModified();
if (compress) {
compress();
}
}
return content;
}
private void compress() throws UnsupportedEncodingException, IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
InputStream is = new ByteArrayInputStream(content);
Writer out = new OutputStreamWriter(baos, charset);
CompilerOptions options = new CompilerOptions();
CompilationLevel.SIMPLE_OPTIMIZATIONS.setOptionsForCompilationLevel(options);
Compiler.setLoggingLevel(Level.OFF);
Compiler compiler = new Compiler();
compiler.disableThreads();
Result result = compiler.compile(new JSSourceFile[] {},
new JSSourceFile[] { JSSourceFile.fromInputStream("is", is) }, options);
if (result.success) {
Pattern pattern = Pattern.compile("^/\\*.*?\\*/\\s?", Pattern.DOTALL);
Matcher matcher = pattern.matcher(new String(content, charset));
while (matcher.find()) {
out.write(matcher.group());
}
out.write(compiler.toSource());
out.flush();
content = baos.toByteArray();
}
is.close();
out.close();
}
}