net.sf.alchim.mojo.yuicompressor.YuiCompressorMojo Maven / Gradle / Ivy

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To compress (Minify + Ofuscate) Javascript files and CSS files (using YUI Compressor from Julien Lecomte) and/or to check Javascript files with jslint.
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package net.sf.alchim.mojo.yuicompressor;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

import org.apache.maven.plugin.MojoExecutionException;
import org.codehaus.plexus.util.IOUtil;

import com.yahoo.platform.yui.compressor.CssCompressor;
import com.yahoo.platform.yui.compressor.JavaScriptCompressor;

/**
 * Apply compression on JS and CSS (using YUI Compressor).
 *
 * @goal compress
 * @phase process-resources
 *
 * @author David Bernard
 * @created 2007-08-28
 */
// @SuppressWarnings("unchecked")
public class YuiCompressorMojo extends MojoSupport {

    /**
     * Read the input file using "encoding".
     *
     * @parameter expression="${file.encoding}" default-value="UTF-8"
     */
    private String encoding;

    /**
     * The output filename suffix.
     *
     * @parameter expression="${maven.yuicompressor.suffix}" default-value="-min"
     */
    private String suffix;

    /**
     * If no "suffix" must be add to output filename (maven's configuration manage empty suffix like default).
     *
     * @parameter expression="${maven.yuicompressor.nosuffix}" default-value="false"
     */
    private boolean nosuffix;

    /**
     * Insert line breaks in output after the specified column number.
     *
     * @parameter expression="${maven.yuicompressor.linebreakpos}" default-value="0"
     */
    private int linebreakpos;

    /**
     * [js only] Minify only, do not obfuscate.
     *
     * @parameter expression="${maven.yuicompressor.nomunge}" default-value="false"
     */
    private boolean nomunge;

    /**
     * [js only] Preserve unnecessary semicolons.
     *
     * @parameter expression="${maven.yuicompressor.preserveAllSemiColons}" default-value="false"
     */
    private boolean preserveAllSemiColons;

    /**
     * force the compression of every files,
     * else if compressed file already exists and is younger than source file, nothing is done.
     *
     * @parameter expression="${maven.yuicompressor.force}" default-value="false"
     */
    private boolean force;

    /**
     * show statistics (compression ratio).
     *
     * @parameter expression="${maven.yuicompressor.statistics}" default-value="true"
     */
    private boolean statistics;

    private long inSizeTotal_;
    private long outSizeTotal_;

    @Override
    protected String[] getDefaultIncludes() throws Exception {
        return new String[]{"**/**.css", "**/**.js"};
    }

    @Override
    public void beforeProcess() throws Exception {
        if (nosuffix) {
            suffix = "";
        }
    }

    @Override
    protected void afterProcess() throws Exception {
        if (statistics && (inSizeTotal_ > 0)) {
            getLog().info(String.format("total input (%db) -> output (%db)[%d%%]", inSizeTotal_, outSizeTotal_, ((outSizeTotal_ * 100)/inSizeTotal_)));
        }
    }


    @Override
    protected void processFile(SourceFile src, File destRoot) throws Exception {
        if (getLog().isDebugEnabled()) {
            getLog().debug("compress file :" + src.toFile()+ " to " + src.toDestFile(destRoot, suffix));
        }
        File inFile = src.toFile();
        File outFile = src.toDestFile(destRoot, suffix);
        if (!force && outFile.exists() && (outFile.lastModified() > src.toFile().lastModified())) {
            if (getLog().isInfoEnabled()) {
                getLog().info("nothing to do, " + outFile + " is younger than original, use 'force' option or clean your target");
            }
            return;
        }
        InputStreamReader in = null;
        OutputStreamWriter out = null;
        try {
            in = new InputStreamReader(new FileInputStream(inFile), encoding);
            if (!outFile.getParentFile().exists() && !outFile.getParentFile().mkdirs()) {
                throw new MojoExecutionException( "Cannot create resource output directory: " + outFile.getParentFile() );
            }
            out = new OutputStreamWriter(new FileOutputStream(outFile), encoding);
            if (".js".equalsIgnoreCase(src.getExtension())) {
                JavaScriptCompressor compressor = new JavaScriptCompressor(in, jsErrorReporter_);
                compressor.compress(out, linebreakpos, !nomunge, jswarn, preserveAllSemiColons);
            } else if (".css".equalsIgnoreCase(src.getExtension())) {
                CssCompressor compressor = new CssCompressor(in);
                compressor.compress(out, linebreakpos);
            }
        } finally {
            IOUtil.close(in);
            IOUtil.close(out);
        }
        if (statistics) {
            inSizeTotal_ += inFile.length();
            outSizeTotal_ += outFile.length();
            getLog().info(String.format("%s (%db) -> %s (%db)[%d%%]", inFile.getName(), inFile.length(), outFile.getName(), outFile.length(), ((outFile.length() * 100)/inFile.length())));
        }
    }
}