com.chiorichan.factory.event.PostJSMinProcessor.java Source code

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Here is the source code for com.chiorichan.factory.event.PostJSMinProcessor.java

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/**
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * Copyright 2016 Chiori Greene a.k.a. Chiori-chan <me@chiorichan.com>
 * All Right Reserved.
 */
package com.chiorichan.factory.event;

import java.util.Arrays;
import java.util.List;

import org.apache.commons.lang3.StringUtils;

import com.chiorichan.event.EventHandler;
import com.chiorichan.event.Listener;
import com.google.common.collect.Lists;
import com.google.javascript.jscomp.CompilationLevel;
import com.google.javascript.jscomp.Compiler;
import com.google.javascript.jscomp.CompilerOptions;
import com.google.javascript.jscomp.SourceFile;

public class PostJSMinProcessor implements Listener {
    @EventHandler()
    public void onEvent(PostEvalEvent event) {
        if (!event.context().contentType().equals("application/javascript-x")
                || !event.context().filename().endsWith("js"))
            return;

        // A simple way to ignore JS files that might already be minimized
        if (event.context().filename() != null && event.context().filename().toLowerCase().endsWith(".min.js"))
            return;

        String code = event.context().readString();
        List<SourceFile> externs = Lists.newArrayList();
        List<SourceFile> inputs = Arrays.asList(SourceFile.fromCode(
                (event.context().filename() == null || event.context().filename().isEmpty()) ? "fakefile.js"
                        : event.context().filename(),
                code));

        Compiler compiler = new Compiler();

        CompilerOptions options = new CompilerOptions();

        CompilationLevel.SIMPLE_OPTIMIZATIONS.setOptionsForCompilationLevel(options);

        compiler.compile(externs, inputs, options);

        event.context().resetAndWrite(StringUtils.trimToNull(compiler.toSource()));
    }

}