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/*
* Copyright (c) 2010-2011 Mozilla Foundation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
package nu.validator.htmlparser.generator;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import nu.validator.htmlparser.impl.Tokenizer;
/**
* Applies a workaround that splits the <code>stateLoop</code> method in the
* tokenizer into two methods. This way, each method stays under 8000 bytes in
* size. By default, HotSpot doesn't compile methods that are over 8000 bytes in
* size, which is a performance problem.
*
* This program should have been written in Perl, but to avoid introducing new
* dependencies, it's written in Java. No attempt at efficiency has been made.
*
* Warning! This modifies Tokenizer.java in place!
*
* @version $Id$
* @author hsivonen
*/
public class ApplyHotSpotWorkaround {
private static final String BEGIN_WORKAROUND = "// BEGIN HOTSPOT WORKAROUND";
private static final String END_WORKAROUND = "// END HOTSPOT WORKAROUND";
public static void main(String[] args) throws Throwable {
String tokenizer = readFileIntoString(args[0]);
String workaround = readFileIntoString(args[1]);
int beginIndex = tokenizer.indexOf(BEGIN_WORKAROUND);
int endIndex = tokenizer.indexOf(END_WORKAROUND);
String tokenizerHead = tokenizer.substring(0, beginIndex);
String tokenizerMiddle = tokenizer.substring(beginIndex, endIndex);
String tokenizerTail = tokenizer.substring(endIndex);
beginIndex = workaround.indexOf(BEGIN_WORKAROUND);
endIndex = workaround.indexOf(END_WORKAROUND);
String workaroundHead = workaround.substring(0, beginIndex);
String workaroundMiddle = workaround.substring(beginIndex, endIndex);
String workaroundTail = workaround.substring(endIndex);
String newTokenizer = tokenizerHead + workaroundMiddle + tokenizerTail;
String newWorkaround = workaroundHead + tokenizerMiddle
+ workaroundTail;
int insertionPoint = newTokenizer.indexOf("// HOTSPOT WORKAROUND INSERTION POINT");
tokenizerHead = newTokenizer.substring(0, insertionPoint);
tokenizerTail = newTokenizer.substring(insertionPoint);
newTokenizer = tokenizerHead + newWorkaround + tokenizerTail;
Pattern pat = Pattern.compile("state = transition\\(state, ([^,]*), reconsume, pos\\)");
Matcher m = pat.matcher(newTokenizer);
newTokenizer = m.replaceAll("state = $1");
Writer out = new OutputStreamWriter(new FileOutputStream(args[0]),
"utf-8");
out.write(newTokenizer);
out.flush();
out.close();
}
private static String readFileIntoString(String name) throws IOException {
Reader in = new InputStreamReader(new FileInputStream(name), "UTF-8");
StringBuilder builder = new StringBuilder();
int c;
while ((c = in.read()) != -1) {
builder.append((char) c);
}
in.close();
return builder.toString();
}
}
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