/**
* 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.jooby.assets;
import org.jooby.MediaType;
import com.google.common.collect.ImmutableMap;
import com.typesafe.config.Config;
/**
* <h1>uglify</h1>
* <p>
* <a href="https://github.com/mishoo/UglifyJS2">UglifyJs2</a> JavaScript parser / mangler /
* compressor / beautifier toolkit.
* </p>
*
* <h2>usage</h2>
*
* <pre>
* assets {
* fileset {
* home: [js/home.js]
* }
*
* pipeline {
* ...
* dist: [uglify]
* }
* }
* </pre>
*
* <h2>options</h2>
* <pre>
* assets {
* ...
* uglify {
* strict: false
* output {
* beautify: true
* }
* }
* }
* </pre>
*
* @author edgar
* @since 0.11.0
*/
public class Uglify extends AssetProcessor {
public Uglify() {
/** Parser options, filename is set from script (no need to set here). */
set("strict", false);
/** Mangle names, on by default. */
set("mangle", true);
/** Compressor options. */
set("sequences", true); // join consecutive statemets with the “comma operator”
set("properties", true); // optimize property access", a["foo"] → a.foo
set("dead_code", true); // discard unreachable code
set("drop_debugger", true); // discard “debugger” statements
set("unsafe", false); // some unsafe optimizations (see below)
set("conditionals", true); // optimize if-s and conditional expressions
set("comparisons", true); // optimize comparisons
set("evaluate", true); // evaluate constant expressions
set("booleans", true); // optimize boolean expressions
set("loops", true); // optimize loops
set("unused", true); // drop unused variables/functions
set("hoist_funs", true); // hoist function declarations
set("hoist_vars", false); // hoist variable declarations
set("if_return", true); // optimize if-s followed by return/continue
set("join_vars", true); // join var declarations
set("cascade", true); // try to cascade `right` into `left` in sequences
set("side_effects", true); // drop side-effect-free statements
set("warnings", true); // warn about potentially dangerous optimizations/code
set("global_defs", ImmutableMap.of());
}
@Override
public boolean matches(final MediaType type) {
return MediaType.js.matches(type);
}
@Override
public String process(final String filename, final String source, final Config conf)
throws Exception {
return V8Context.run(v8 -> {
return v8.invoke("uglify.js", source, options(), filename);
});
}
}