/**
* Copyright 2009 Google Inc.
*
* 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.
*/
jimport("java.lang.System.err")
jimport("yuicompressor.org.mozilla.javascript.ErrorReporter");
jimport("com.yahoo.platform.yui.compressor.JavaScriptCompressor")
jimport("com.yahoo.platform.yui.compressor.CssCompressor")
jimport("java.io.StringReader");
jimport("java.io.StringWriter");
/**
* Compresses the given JavaScript code into an equivalent, shorter string of code using
* YUICompressor. In addition to removing white-space and comments, YUICompressor
* does a full semantic parse of the code and renames non-global variables to have
* very short names. Scopes that are visible to "eval" and "with" are excluded from
* variable renaming, making the operation very safe.
* <p>
* For example,
* yuicompressor.compressJS("function foo() { var longVariableName = 3; return longVariableName }");
* produces
* "function foo(){var A=3;return A;}"
*/
function compressJS(code) {
function getComplaint(message, sourceName, line, lineSource, lineOffset) {
if (line < 0) return message;
else return (line+":"+lineOffset+":"+message);
}
function complaintHandler(func) {
return function(message, sourceName, line, lineSource, lineOffset) {
return func(getComplaint(message, sourceName, line, lineSource, lineOffset));
}
}
var myErrorReporter = new JavaAdapter(ErrorReporter, {
warning: complaintHandler(function (msg) {
if (msg.indexOf("Try to use a single 'var' statement per scope.") >= 0)
return;
err.println("yuicompressor.compressJS warning: "+msg);
}),
error: complaintHandler(function (msg) {
throw new Error("yuicompressor.compressJS error: "+msg);
}),
runtimeError: complaintHandler(function (msg) {
throw new Error("yuicompressor.compressJS error: "+msg);
})
});
var munge = true;
var verbose = false;
var optimize = true;
var wrapPos = 100; // characters, no wrap == -1
var compressor = new JavaScriptCompressor(new StringReader(code), myErrorReporter);
var writer = new StringWriter();
compressor.compress(writer, 100, munge, verbose, true, !optimize);
return String(writer.toString());
}
/**
* Compresses the given CSS code into an equivalent, shorter string of code using
* YUICompressor. Besides removing unnecessary white-space and comments, the operation
* performs an assortment of semantics-preserving optimizations. The operation attempts
* to preserve common "hacks" that take advantage of browser differences in parsing.
*/
function compressCSS(code) {
var compressor = new CssCompressor(new StringReader(code));
var wrapPos = 100; // characters, no wrap == -1
var writer = new StringWriter();
compressor.compress(writer, wrapPos);
return String(writer.toString());
}
