com.samaxes.maven.plugin.minify.ProcessJSFilesTask Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of minify-maven-plugin Show documentation
Combine and minimize JavaScript and CSS files for faster page loading.
There is a newer version: 1.7.6
/*
 * $Id$
 *
 * Minify Maven Plugin
 * https://github.com/samaxes/minify-maven-plugin
 *
 * Copyright (c) 2009 samaxes.com
 *
 * 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.samaxes.maven.plugin.minify;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.util.List;

import org.apache.maven.plugin.logging.Log;
import org.codehaus.plexus.util.IOUtil;

import com.samaxes.maven.plugin.common.JavaScriptErrorReporter;
import com.yahoo.platform.yui.compressor.JavaScriptCompressor;

/**
 * Task for merging and compressing JavaScript files.
 */
public class ProcessJSFilesTask extends ProcessFilesTask {

    private boolean munge;

    private boolean verbose;

    private boolean preserveAllSemiColons;

    private boolean disableOptimizations;

    /**
     * Task constructor.
     *
     * @param log Maven plugin log
     * @param bufferSize size of the buffer used to read source files.
     * @param webappSourceDir web resources source directory
     * @param webappTargetDir web resources target directory
     * @param inputDir directory containing source files
     * @param sourceFiles list of source files to include
     * @param sourceIncludes list of source files to include
     * @param sourceExcludes list of source files to exclude
     * @param outputDir directory to write the final file
     * @param finalFilename final filename
     * @param suffix final filename suffix
     * @param charset if a character set is specified, a byte-to-char variant allows the encoding to be selected.
     *        Otherwise, only byte-to-byte operations are used
     * @param linebreak split long lines after a specific column
     * @param munge minify only
     * @param verbose display informational messages and warnings
     * @param preserveAllSemiColons preserve unnecessary semicolons
     * @param disableOptimizations disable all the built-in micro optimizations
     */
    public ProcessJSFilesTask(Log log, Integer bufferSize, String webappSourceDir, String webappTargetDir,
            String inputDir, List sourceFiles, List sourceIncludes, List sourceExcludes,
            String outputDir, String finalFilename, String suffix, String charset, int linebreak, boolean munge,
            boolean verbose, boolean preserveAllSemiColons, boolean disableOptimizations) {
        super(log, bufferSize, webappSourceDir, webappTargetDir, inputDir, sourceFiles, sourceIncludes, sourceExcludes,
                outputDir, finalFilename, suffix, charset, linebreak);

        this.munge = munge;
        this.verbose = verbose;
        this.preserveAllSemiColons = preserveAllSemiColons;
        this.disableOptimizations = disableOptimizations;
    }

    /**
     * Minifies JavaScript file.
     */
    @Override
    protected void minify() {
        if (minifiedFile != null) {
            try {
                log.info("Creating minified file [" + minifiedFile.getName() + "].");

                InputStream in = new FileInputStream(mergedFile);
                OutputStream out = new FileOutputStream(minifiedFile);
                InputStreamReader reader;
                OutputStreamWriter writer;
                if (charset == null) {
                    reader = new InputStreamReader(in);
                    writer = new OutputStreamWriter(out);
                } else {
                    reader = new InputStreamReader(in, charset);
                    writer = new OutputStreamWriter(out, charset);
                }

                JavaScriptCompressor compressor = new JavaScriptCompressor(reader, new JavaScriptErrorReporter(log,
                        mergedFile.getName()));
                compressor.compress(writer, linebreak, munge, verbose, preserveAllSemiColons, disableOptimizations);

                IOUtil.close(reader);
                IOUtil.close(writer);
                IOUtil.close(in);
                IOUtil.close(out);
            } catch (IOException e) {
                log.error(e.getMessage(), e);
            }
        }
    }
}