/* | |
* Licensed to the Apache Software Foundation (ASF) under one | |
* or more contributor license agreements. See the NOTICE file | |
* distributed with this work for additional information | |
* regarding copyright ownership. The ASF licenses this file | |
* to you 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.apache.myfaces.buildtools.maven2.plugin.javascript.jmt.compress; | |
import java.io.File; | |
import java.io.PrintStream; | |
import org.codehaus.plexus.util.IOUtil; | |
import org.codehaus.plexus.util.StringOutputStream; | |
import org.mozilla.javascript.Context; | |
import org.mozilla.javascript.ContextAction; | |
import org.mozilla.javascript.ScriptableObject; | |
import org.mozilla.javascript.tools.ToolErrorReporter; | |
import org.mozilla.javascript.tools.shell.Global; | |
import org.mozilla.javascript.tools.shell.Main; | |
import org.mozilla.javascript.tools.shell.ShellContextFactory; | |
/** | |
* A JS compressor that uses Dojo modified Rhino engine to compress the script. | |
* The resulting compressed-js is garanteed to be functionaly equivalent as this | |
* is the internal view of the rhino context. | |
* | |
* @author <a href="mailto:nicolas@apache.org">nicolas De Loof</a> | |
*/ | |
public class ShrinksafeCompressor | |
implements JSCompressor | |
{ | |
/** | |
* {@inheritDoc} | |
* | |
* @see org.apache.myfaces.buildtools.maven2.plugin.javascript.jmt.compress.mojo.javascript.compress.JSCompressor#compress(java.io.File, | |
* java.io.File, int, int) | |
*/ | |
public void compress( final File input, File compressed, int level, int language ) | |
throws CompressionException | |
{ | |
PrintStream o = System.out; | |
System.setOut( new PrintStream( new StringOutputStream() ) ); | |
PrintStream out = null; | |
try | |
{ | |
String[] args = new String[3]; | |
args[0] = "-c"; // Set Main.outputCompressed = true | |
args[1] = "-o"; // Set Main.outputFileName | |
args[2] = compressed.getAbsolutePath(); | |
Main.processOptions( args ); | |
final ToolErrorReporter errorReporter = new ToolErrorReporter( false, System.err ); | |
errorReporter.setIsReportingWarnings( false ); | |
final ShellContextFactory shellContextFactory = new ShellContextFactory(); | |
shellContextFactory.setLanguageVersion( language ); | |
shellContextFactory.setOptimizationLevel( level ); | |
shellContextFactory.setErrorReporter( errorReporter ); | |
shellContextFactory.setStrictMode( true ); | |
final Global scope = new Global(); | |
scope.init( shellContextFactory ); | |
shellContextFactory.call( new ContextAction() | |
{ | |
public Object run( Context context ) | |
{ | |
Object[] args = new Object[1]; | |
scope.defineProperty( "arguments", args, ScriptableObject.DONTENUM ); | |
Main.processFile( context, scope, input.getAbsolutePath() ); | |
return null; | |
} | |
} ); | |
} | |
catch ( Exception e ) | |
{ | |
throw new CompressionException( "Failed to create compressed file", e, input ); | |
} | |
finally | |
{ | |
System.setOut( o ); | |
IOUtil.close( out ); | |
} | |
} | |
} |