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package moe.nea.zwirn;
import net.fabricmc.stitch.commands.tinyv2.TinyClass;
import net.fabricmc.stitch.commands.tinyv2.TinyField;
import net.fabricmc.stitch.commands.tinyv2.TinyFile;
import org.jetbrains.annotations.NotNull;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.Opcodes;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.Map;
import java.util.stream.Collectors;
public class FieldSignatureFixer {
private final TinyFile tinyFile;
private final Path classRoot;
public FieldSignatureFixer(@NotNull TinyFile tinyFile, @NotNull Path classRoot) {
this.tinyFile = tinyFile;
this.classRoot = classRoot;
}
public TinyFile fix() {
return new TinyFile(tinyFile.getHeader(),
tinyFile.getClassEntries().stream().map(this::fixClass).collect(Collectors.toList())
);
}
private TinyClass fixClass(TinyClass tinyClass) {
var path = tinyClass.getClassNames().get(0).replace('.', '/') + ".class";
var classPath = classRoot.resolve(path);
Map<String, String> fieldNameToDescriptorMap = new HashMap<>();
if (Files.exists(classPath))
try (var is = Files.newInputStream(classPath)) {
var reader = new ClassReader(is);
var visitor = new FieldSignatureVisitor();
reader.accept(visitor, 0);
fieldNameToDescriptorMap.putAll(visitor.fieldNameToDescriptorMap);
} catch (IOException e) {
throw new RuntimeException(e);
}
return new TinyClass(
tinyClass.getClassNames(),
tinyClass.getMethods(),
tinyClass.getFields().stream()
.map(it -> new TinyField(fieldNameToDescriptorMap.get(it.getFieldNames().get(0)), it.getFieldNames(), it.getComments()))
.collect(Collectors.toList()),
tinyClass.getComments()
);
}
static class FieldSignatureVisitor extends ClassVisitor {
protected FieldSignatureVisitor() {
super(Opcodes.ASM9);
}
public Map<String, String> fieldNameToDescriptorMap = new HashMap<>();
@Override
public FieldVisitor visitField(int access, String name, String descriptor, String signature, Object value) {
fieldNameToDescriptorMap.put(name, descriptor);
return super.visitField(access, name, descriptor, signature, value);
}
}
}
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