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/*******************************************************************************
* Copyright (c) 2015 Jeff Martin.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the GNU Lesser General Public
* License v3.0 which accompanies this distribution, and is available at
* http://www.gnu.org/licenses/lgpl.html
* <p>
* Contributors:
* Jeff Martin - initial API and implementation
******************************************************************************/
package cuchaz.enigma.translation;
import com.google.common.collect.Lists;
import java.io.IOException;
import java.io.StringReader;
import java.util.List;
public class SignatureUpdater {
public static String update(String signature, ClassNameUpdater updater) {
try {
StringBuilder buf = new StringBuilder();
// read the signature character-by-character
StringReader reader = new StringReader(signature);
int i;
while ((i = reader.read()) != -1) {
char c = (char) i;
// does this character start a class name?
if (c == 'L') {
// update the class name and add it to the buffer
buf.append('L');
String className = readClass(reader);
if (className == null) {
throw new IllegalArgumentException("Malformed signature: " + signature);
}
buf.append(updater.update(className));
buf.append(';');
} else {
// copy the character into the buffer
buf.append(c);
}
}
return buf.toString();
} catch (IOException ex) {
// I'm pretty sure a StringReader will never throw one of these
throw new Error(ex);
}
}
private static String readClass(StringReader reader) throws IOException {
// read all the characters in the buffer until we hit a ';'
// remember to treat generics correctly
StringBuilder buf = new StringBuilder();
int depth = 0;
int i;
while ((i = reader.read()) != -1) {
char c = (char) i;
if (c == '<') {
depth++;
} else if (c == '>') {
depth--;
} else if (depth == 0) {
if (c == ';') {
return buf.toString();
} else {
buf.append(c);
}
}
}
return null;
}
public static List<String> getClasses(String signature) {
final List<String> classNames = Lists.newArrayList();
update(signature, className -> {
classNames.add(className);
return className;
});
return classNames;
}
public interface ClassNameUpdater {
String update(String className);
}
}
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