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YUICompressor.java
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YUICompressor.java
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/*
* YUI Compressor
* Author: Julien Lecomte - http://www.julienlecomte.net/
* Copyright (c) 2009 Yahoo! Inc. All rights reserved.
* The copyrights embodied in the content of this file are licensed
* by Yahoo! Inc. under the BSD (revised) open source license.
*/
package com.yahoo.platform.yui.compressor;
import jargs.gnu.CmdLineParser;
import org.mozilla.javascript.ErrorReporter;
import org.mozilla.javascript.EvaluatorException;
import java.io.*;
import java.nio.charset.Charset;
public class YUICompressor {
public static void main(String args[]) {
CmdLineParser parser = new CmdLineParser();
CmdLineParser.Option typeOpt = parser.addStringOption("type");
CmdLineParser.Option verboseOpt = parser.addBooleanOption('v', "verbose");
CmdLineParser.Option nomungeOpt = parser.addBooleanOption("nomunge");
CmdLineParser.Option linebreakOpt = parser.addStringOption("line-break");
CmdLineParser.Option preserveSemiOpt = parser.addBooleanOption("preserve-semi");
CmdLineParser.Option disableOptimizationsOpt = parser.addBooleanOption("disable-optimizations");
CmdLineParser.Option helpOpt = parser.addBooleanOption('h', "help");
CmdLineParser.Option charsetOpt = parser.addStringOption("charset");
CmdLineParser.Option outputFilenameOpt = parser.addStringOption('o', "output");
Reader in = null;
Writer out = null;
try {
parser.parse(args);
Boolean help = (Boolean) parser.getOptionValue(helpOpt);
if (help != null && help.booleanValue()) {
usage();
System.exit(0);
}
boolean verbose = parser.getOptionValue(verboseOpt) != null;
String charset = (String) parser.getOptionValue(charsetOpt);
if (charset == null || !Charset.isSupported(charset)) {
// charset = System.getProperty("file.encoding");
// if (charset == null) {
// charset = "UTF-8";
// }
// UTF-8 seems to be a better choice than what the system is reporting
charset = "UTF-8";
if (verbose) {
System.err.println("\n[INFO] Using charset " + charset);
}
}
int linebreakpos = -1;
String linebreakstr = (String) parser.getOptionValue(linebreakOpt);
if (linebreakstr != null) {
try {
linebreakpos = Integer.parseInt(linebreakstr, 10);
} catch (NumberFormatException e) {
usage();
System.exit(1);
}
}
String type = (String) parser.getOptionValue(typeOpt);
if (type != null && !type.equalsIgnoreCase("js") && !type.equalsIgnoreCase("css")) {
usage();
System.exit(1);
}
String[] fileArgs = parser.getRemainingArgs();
java.util.List files = java.util.Arrays.asList(fileArgs);
if (files.isEmpty()) {
files = new java.util.ArrayList();
files.add("-"); // read from stdin
}
String output = (String) parser.getOptionValue(outputFilenameOpt);
String pattern[] = output != null ? output.split(":") : new String[0];
java.util.Iterator filenames = files.iterator();
while(filenames.hasNext()) {
String inputFilename = (String)filenames.next();
try {
if (inputFilename.equals("-")) {
in = new InputStreamReader(System.in, charset);
} else {
if (type == null) {
int idx = inputFilename.lastIndexOf('.');
if (idx >= 0 && idx < inputFilename.length() - 1) {
type = inputFilename.substring(idx + 1);
}
}
if (type == null || !type.equalsIgnoreCase("js") && !type.equalsIgnoreCase("css")) {
usage();
System.exit(1);
}
in = new InputStreamReader(new FileInputStream(inputFilename), charset);
}
String outputFilename = output;
// if a substitution pattern was passed in
if (pattern.length > 1 && files.size() > 1) {
outputFilename = inputFilename.replaceFirst(pattern[0], pattern[1]);
}
if (type.equalsIgnoreCase("js")) {
try {
JavaScriptCompressor compressor = new JavaScriptCompressor(in, new ErrorReporter() {
public void warning(String message, String sourceName,
int line, String lineSource, int lineOffset) {
if (line < 0) {
System.err.println("\n[WARNING] " + message);
} else {
System.err.println("\n[WARNING] " + line + ':' + lineOffset + ':' + message);
}
}
public void error(String message, String sourceName,
int line, String lineSource, int lineOffset) {
if (line < 0) {
System.err.println("\n[ERROR] " + message);
} else {
System.err.println("\n[ERROR] " + line + ':' + lineOffset + ':' + message);
}
}
public EvaluatorException runtimeError(String message, String sourceName,
int line, String lineSource, int lineOffset) {
error(message, sourceName, line, lineSource, lineOffset);
return new EvaluatorException(message);
}
});
// Close the input stream first, and then open the output stream,
// in case the output file should override the input file.
in.close(); in = null;
if (outputFilename == null) {
out = new OutputStreamWriter(System.out, charset);
} else {
out = new OutputStreamWriter(new FileOutputStream(outputFilename), charset);
}
boolean munge = parser.getOptionValue(nomungeOpt) == null;
boolean preserveAllSemiColons = parser.getOptionValue(preserveSemiOpt) != null;
boolean disableOptimizations = parser.getOptionValue(disableOptimizationsOpt) != null;
compressor.compress(out, linebreakpos, munge, verbose,
preserveAllSemiColons, disableOptimizations);
} catch (EvaluatorException e) {
e.printStackTrace();
// Return a special error code used specifically by the web front-end.
System.exit(2);
}
} else if (type.equalsIgnoreCase("css")) {
CssCompressor compressor = new CssCompressor(in);
// Close the input stream first, and then open the output stream,
// in case the output file should override the input file.
in.close(); in = null;
if (outputFilename == null) {
out = new OutputStreamWriter(System.out, charset);
} else {
out = new OutputStreamWriter(new FileOutputStream(outputFilename), charset);
}
compressor.compress(out, linebreakpos);
}
} catch (IOException e) {
e.printStackTrace();
System.exit(1);
} finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (out != null) {
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
} catch (CmdLineParser.OptionException e) {
usage();
System.exit(1);
}
}
private static void usage() {
System.err.println(
"\nUsage: java -jar yuicompressor-x.y.z.jar [options] [input file]\n\n"
+ "Global Options\n"
+ " -h, --help Displays this information\n"
+ " --type <js|css> Specifies the type of the input file\n"
+ " --charset <charset> Read the input file using <charset>\n"
+ " --line-break <column> Insert a line break after the specified column number\n"
+ " -v, --verbose Display informational messages and warnings\n"
+ " -o <file> Place the output into <file>. Defaults to stdout.\n"
+ " Multiple files can be processed using the following syntax:\n"
+ " java -jar yuicompressor.jar -o '.css$:-min.css' *.css\n"
+ " java -jar yuicompressor.jar -o '.js$:-min.js' *.js\n\n"
+ "JavaScript Options\n"
+ " --nomunge Minify only, do not obfuscate\n"
+ " --preserve-semi Preserve all semicolons\n"
+ " --disable-optimizations Disable all micro optimizations\n\n"
+ "If no input file is specified, it defaults to stdin. In this case, the 'type'\n"
+ "option is required. Otherwise, the 'type' option is required only if the input\n"
+ "file extension is neither 'js' nor 'css'.");
}
}