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/*******************************************************************************
* Copyright (c) 2014 Jeff Martin.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the GNU Public License v3.0
* which accompanies this distribution, and is available at
* http://www.gnu.org/licenses/gpl.html
*
* Contributors:
* Jeff Martin - initial API and implementation
******************************************************************************/
package cuchaz.enigma.mapping;
import java.io.IOException;
import java.io.StringReader;
import java.util.List;
import com.google.common.collect.Lists;
public class SignatureUpdater
{
public interface ClassNameUpdater
{
String update( String className );
}
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 = -1;
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 = -1;
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, new ClassNameUpdater( )
{
@Override
public String update( String className )
{
classNames.add( className );
return className;
}
} );
return classNames;
}
}
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