com.chiorichan.factory.postprocessors.JSMinPostProcessor.java Source code

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Here is the source code for com.chiorichan.factory.postprocessors.JSMinPostProcessor.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 2015 Chiori-chan. All Right Reserved.
 * 
 * @author Chiori Greene
 * @email chiorigreene@gmail.com
 */
package com.chiorichan.factory.postprocessors;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;

import java.nio.charset.Charset;
import java.util.Arrays;
import java.util.List;

import org.apache.commons.lang3.StringUtils;

import com.chiorichan.Loader;
import com.chiorichan.factory.EvalMetaData;
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 JSMinPostProcessor implements PostProcessor {
    @Override
    public String[] getHandledTypes() {
        return new String[] { "js", "application/javascript-x" };
    }

    @Override
    public ByteBuf process(EvalMetaData meta, ByteBuf buf) throws Exception {
        // A simple way to ignore JS files that might already be minimized
        if (meta.fileName != null && meta.fileName.toLowerCase().endsWith(".min.js"))
            return buf;

        String code = buf.toString(Charset.defaultCharset());
        List<SourceFile> externs = Lists.newArrayList();
        List<SourceFile> inputs = Arrays.asList(SourceFile.fromCode(
                (meta.fileName == null || meta.fileName.isEmpty()) ? "fakefile.js" : meta.fileName, code));

        Compiler compiler = new Compiler();

        CompilerOptions options = new CompilerOptions();

        CompilationLevel.SIMPLE_OPTIMIZATIONS.setOptionsForCompilationLevel(options);

        compiler.compile(externs, inputs, options);

        return Unpooled.buffer().writeBytes(StringUtils.trimToNull(compiler.toSource()).getBytes());
    }

}