package com.googlecode.htmlcompressor.compressor;
/*
* 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.
*/
import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;
import org.mozilla.javascript.ErrorReporter;
import org.mozilla.javascript.EvaluatorException;
import com.yahoo.platform.yui.compressor.JavaScriptCompressor;
/**
* Basic JavaScript compressor implementation using <a href="http://developer.yahoo.com/yui/compressor/">Yahoo YUI Compressor</a>
* that could be used by {@link HtmlCompressor} for inline JavaScript compression.
*
* @author <a href="mailto:[email protected]">Sergiy Kovalchuk</a>
*
* @see HtmlCompressor#setJavaScriptCompressor(Compressor)
* @see <a href="http://developer.yahoo.com/yui/compressor/">Yahoo YUI Compressor</a>
*/
public class YuiJavaScriptCompressor implements Compressor {
//YUICompressor default settings
private boolean noMunge = false;
private boolean preserveAllSemiColons = false;
private boolean disableOptimizations = false;
private int lineBreak = -1;
private ErrorReporter errorReporter = new DefaultErrorReporter();
public YuiJavaScriptCompressor() {
}
@Override
public String compress(String source) {
StringWriter result = new StringWriter();
try {
JavaScriptCompressor compressor = new JavaScriptCompressor(new StringReader(source), errorReporter);
compressor.compress(result, lineBreak, !noMunge, false, preserveAllSemiColons, disableOptimizations);
} catch (IOException e) {
result.write(source);
e.printStackTrace();
}
return result.toString();
}
/**
* Default <code>ErrorReporter</code> implementation that uses <code>System.err</code>
* stream for error reporting. Used by YUI Compressor to log errors during JavaScript compression.
*
* @see <a href="http://developer.yahoo.com/yui/compressor/">Yahoo YUI Compressor</a>
* @see <a href="http://www.mozilla.org/rhino/apidocs/org/mozilla/javascript/ErrorReporter.html">ErrorReporter Interface</a>
*
* @author <a href="mailto:[email protected]">Sergiy Kovalchuk</a>
*
*/
public static class DefaultErrorReporter implements ErrorReporter{
public void warning(String message, String sourceName, int line, String lineSource, int lineOffset) {
if (line < 0) {
System.err.println("[WARNING] HtmlCompressor: \"" + message + "\" during JavaScript compression");
} else {
System.err.println("[WARNING] HtmlCompressor: \"" + message + "\" at line [" + line + ":" + lineOffset + "] during JavaScript compression" + (lineSource != null ? ": " + lineSource : ""));
}
}
public void error(String message, String sourceName, int line, String lineSource, int lineOffset) {
if (line < 0) {
System.err.println("[ERROR] HtmlCompressor: \"" + message + "\" during JavaScript compression");
} else {
System.err.println("[ERROR] HtmlCompressor: \"" + message + "\" at line [" + line + ":" + lineOffset + "] during JavaScript compression" + (lineSource != null ? ": " + lineSource : ""));
}
}
public EvaluatorException runtimeError(String message, String sourceName, int line, String lineSource, int lineOffset) {
error(message, sourceName, line, lineSource, lineOffset);
return new EvaluatorException(message);
}
}
/**
* Returns <code>true</code> if Yahoo YUI Compressor
* will only minify javascript without obfuscating local symbols.
* This corresponds to <code>--nomunge</code> command line option.
*
* @return <code>nomunge</code> parameter value used for JavaScript compression.
*
* @see <a href="http://developer.yahoo.com/yui/compressor/">Yahoo YUI Compressor</a>
*/
public boolean isNoMunge() {
return noMunge;
}
/**
* Tells Yahoo YUI Compressor to only minify javascript without obfuscating
* local symbols. This corresponds to <code>--nomunge</code> command line option.
* This option has effect only if JavaScript compression is enabled.
* Default is <code>false</code>.
*
* @param noMunge set <code>true<code> to enable <code>nomunge</code> mode
*
* @see <a href="http://developer.yahoo.com/yui/compressor/">Yahoo YUI Compressor</a>
*/
public void setNoMunge(boolean noMunge) {
this.noMunge = noMunge;
}
/**
* Returns <code>true</code> if Yahoo YUI Compressor
* will preserve unnecessary semicolons during JavaScript compression.
* This corresponds to <code>--preserve-semi</code> command line option.
*
* @return <code>preserve-semi</code> parameter value used for JavaScript compression.
*
* @see <a href="http://developer.yahoo.com/yui/compressor/">Yahoo YUI Compressor</a>
*/
public boolean isPreserveAllSemiColons() {
return preserveAllSemiColons;
}
/**
* Tells Yahoo YUI Compressor to preserve unnecessary semicolons
* during JavaScript compression. This corresponds to
* <code>--preserve-semi</code> command line option.
* This option has effect only if JavaScript compression is enabled.
* Default is <code>false</code>.
*
* @param preserveAllSemiColons set <code>true<code> to enable <code>preserve-semi</code> mode
*
* @see <a href="http://developer.yahoo.com/yui/compressor/">Yahoo YUI Compressor</a>
*/
public void setPreserveAllSemiColons(boolean preserveAllSemiColons) {
this.preserveAllSemiColons = preserveAllSemiColons;
}
/**
* Returns <code>true</code> if Yahoo YUI Compressor
* will disable all the built-in micro optimizations during JavaScript compression.
* This corresponds to <code>--disable-optimizations</code> command line option.
*
* @return <code>disable-optimizations</code> parameter value used for JavaScript compression.
*
* @see <a href="http://developer.yahoo.com/yui/compressor/">Yahoo YUI Compressor</a>
*/
public boolean isDisableOptimizations() {
return disableOptimizations;
}
/**
* Tells Yahoo YUI Compressor to disable all the built-in micro optimizations
* during JavaScript compression. This corresponds to
* <code>--disable-optimizations</code> command line option.
* This option has effect only if JavaScript compression is enabled.
* Default is <code>false</code>.
*
* @param disableOptimizations set <code>true<code> to enable
* <code>disable-optimizations</code> mode
*
* @see <a href="http://developer.yahoo.com/yui/compressor/">Yahoo YUI Compressor</a>
*/
public void setDisableOptimizations(boolean disableOptimizations) {
this.disableOptimizations = disableOptimizations;
}
/**
* Returns number of symbols per line Yahoo YUI Compressor
* will use during JavaScript compression.
* This corresponds to <code>--line-break</code> command line option.
*
* @return <code>line-break</code> parameter value used for JavaScript compression.
*
* @see <a href="http://developer.yahoo.com/yui/compressor/">Yahoo YUI Compressor</a>
*/
public int getLineBreak() {
return lineBreak;
}
/**
* Tells Yahoo YUI Compressor to break lines after the specified number of symbols
* during JavaScript compression. This corresponds to
* <code>--line-break</code> command line option.
* This option has effect only if JavaScript compression is enabled.
* Default is <code>-1</code> to disable line breaks.
*
* @param lineBreak set number of symbols per line
*
* @see <a href="http://developer.yahoo.com/yui/compressor/">Yahoo YUI Compressor</a>
*/
public void setLineBreak(int lineBreak) {
this.lineBreak = lineBreak;
}
/**
* Returns <code>ErrorReporter</code> used by YUI Compressor to log error messages
* during JavasSript compression
*
* @return <code>ErrorReporter</code> used by YUI Compressor to log error messages
* during JavasSript compression
*
* @see <a href="http://developer.yahoo.com/yui/compressor/">Yahoo YUI Compressor</a>
* @see <a href="http://www.mozilla.org/rhino/apidocs/org/mozilla/javascript/ErrorReporter.html">Error Reporter Interface</a>
*/
public ErrorReporter getErrorReporter() {
return errorReporter;
}
/**
* Sets <code>ErrorReporter</code> that YUI Compressor will use for reporting errors during
* JavaScript compression. If no <code>ErrorReporter</code> was provided
* {@link YuiJavaScriptCompressor.DefaultErrorReporter} will be used
* which reports errors to <code>System.err</code> stream.
*
* @param errorReporter <code>ErrorReporter<code> that will be used by YUI Compressor
*
* @see YuiJavaScriptCompressor.DefaultErrorReporter
* @see <a href="http://developer.yahoo.com/yui/compressor/">Yahoo YUI Compressor</a>
* @see <a href="http://www.mozilla.org/rhino/apidocs/org/mozilla/javascript/ErrorReporter.html">ErrorReporter Interface</a>
*/
public void setErrorReporter(ErrorReporter errorReporter) {
this.errorReporter = errorReporter;
}
}
