Get mapping reversal working

src/main/java/io/github/moehreag/mojmap_patcher/MojMapPatcher.java

@@ -14,7 +14,13 @@ public class MojMapPatcher {
         }
         MojmapProvider.get(version).map(ProguardParser::read).ifPresent(s -> {
             //s.getClassFields().keySet().forEach(System.out::println);
-            s.classFields().get("net.minecraft.client.Minecraft").forEach((s1, s2) -> System.out.println(s1 + " -> " + s2));
+            String mcObf = s.classes().get("net/minecraft/client/Minecraft");
+            s = s.reverse();
+            s.fields()
+                    .entrySet()
+                    .stream()
+                    .filter(entry -> entry.getKey().owner().equals(mcObf))
+                    .forEach(entry -> System.out.println(entry.getKey() + " -> " + entry.getValue()));
         });
     }
 }

src/main/java/io/github/moehreag/mojmap_patcher/api/Mapper.java

@@ -1,8 +1,7 @@
 package io.github.moehreag.mojmap_patcher.api;
 
 import io.github.moehreag.mojmap_patcher.api.data.MappingData;
-import io.github.moehreag.mojmap_patcher.api.data.Field;
+import io.github.moehreag.mojmap_patcher.api.data.Member;
-import io.github.moehreag.mojmap_patcher.api.data.Method;
 import org.objectweb.asm.commons.Remapper;
 
 import java.util.Collections;
@@ -17,54 +16,18 @@ public class Mapper extends Remapper {
         throw new UnsupportedOperationException("TODO");
     }
 
-    public String mapClass(String name) {
-        return data.classes().getOrDefault(name, name);
-    }
-
-    private Optional<Method> mapMethodInternal(String owner, String name, String descriptor) {
-        for (Map.Entry<Method, Method> entry : data.classMethods().getOrDefault(owner, Collections.emptyMap()).entrySet()) {
-            Method from = entry.getKey();
-            Method to = entry.getValue();
-
-            if (from.name().equals(name) && from.descriptor().equals(descriptor)) {
-                return Optional.of(to);
-            }
-        }
-        return Optional.empty();
-    }
-
-    public Method mapMethod(String owner, String name, String descriptor) {
-        return mapMethodInternal(owner, name, descriptor).orElse(null);
-    }
-
-    private Optional<Field> mapFieldInternal(String owner, String name, String descriptor) {
-        for (Map.Entry<Field, Field> entry : data.classFields().getOrDefault(owner, Collections.emptyMap()).entrySet()) {
-            Field from = entry.getKey();
-            Field to = entry.getValue();
-
-            if (from.name().equals(name) && from.descriptor().equals(descriptor)) {
-                return Optional.of(to);
-            }
-        }
-        return Optional.empty();
-    }
-
-    public Field mapField(String owner, String name, String descriptor) {
-        return mapFieldInternal(owner, name, descriptor).orElse(null);
-    }
-
     @Override
     public String map(String internalName) {
-        return mapClass(internalName);
+        return data.classes().get(internalName);
     }
 
     @Override
     public String mapMethodName(String owner, String name, String descriptor) {
-        return mapMethodInternal(owner, name, descriptor).map(Method::name).orElse(name);
+        return data.methods().get(new Member(owner, name, descriptor));
     }
 
     @Override
     public String mapFieldName(String owner, String name, String descriptor) {
-        return mapFieldInternal(owner, name, descriptor).map(Field::name).orElse(name);
+        return data.fields().get(new Member(owner, name, descriptor));
     }
 }

src/main/java/io/github/moehreag/mojmap_patcher/api/data/Field.java

@@ -1,4 +0,0 @@
-package io.github.moehreag.mojmap_patcher.api.data;
-
-public record Field(String name, String descriptor) {
-}

src/main/java/io/github/moehreag/mojmap_patcher/api/data/MappingData.java

@@ -1,17 +1,66 @@
 package io.github.moehreag.mojmap_patcher.api.data;
 
+import org.objectweb.asm.Type;
+
+import java.util.Arrays;
 import java.util.HashMap;
 import java.util.Map;
 
-public record MappingData(
+public record MappingData(Map<String, String> classes, Map<Member, String> methods, Map<Member, String> fields) {
-        // IntelliJank, stop putting 8 spaces >:(
-        Map<String, String> classes,
-        Map<String, Map<Method, Method>> classMethods,
-        Map<String, Map<Field, Field>> classFields
-) {
 
     public MappingData() {
         this(new HashMap<>(), new HashMap<>(), new HashMap<>());
     }
 
+    public MappingData reverse() {
+        Map<String, String> classesReversed = new HashMap<>();
+        Map<Member, String> methodsReversed = new HashMap<>();
+        Map<Member, String> fieldsReversed = new HashMap<>();
+
+        for (Map.Entry<String, String> clazz : classes.entrySet())
+            classesReversed.put(clazz.getValue(), clazz.getValue());
+
+        for (Map.Entry<Member, String> method : methods.entrySet()) {
+            methodsReversed.put(
+                    new Member(
+                            classes.getOrDefault(method.getKey().owner(), method.getKey().owner()),
+                            method.getValue(),
+                            remapType(Type.getType(method.getKey().descriptor())).getDescriptor()
+                    ),
+                    method.getKey().name()
+            );
+        }
+
+        for (Map.Entry<Member, String> field : fields.entrySet()) {
+            fieldsReversed.put(
+                    new Member(
+                            classes.getOrDefault(field.getKey().owner(), field.getKey().owner()),
+                            field.getValue(),
+                            remapType(Type.getType(field.getKey().descriptor())).getDescriptor()
+                    ),
+                    field.getKey().name()
+            );
+        }
+
+        return new MappingData(classesReversed, methodsReversed, fieldsReversed);
+    }
+
+    private Type remapType(Type type) {
+        switch (type.getSort()) {
+            case Type.OBJECT:
+                return Type.getObjectType(classes.getOrDefault(type.getInternalName(), type.getInternalName()));
+            case Type.ARRAY:
+                return Type.getObjectType(
+                        "[".repeat(type.getDimensions()) + remapType(type.getElementType()).getDescriptor()
+                );
+            case Type.METHOD:
+                return Type.getMethodType(
+                        remapType(type.getReturnType()),
+                        Arrays.stream(type.getArgumentTypes()).map(this::remapType).toArray(Type[]::new)
+                );
+            default:
+                return type;
+        }
+    }
+
 }

src/main/java/io/github/moehreag/mojmap_patcher/api/data/Member.java

@@ -0,0 +1,4 @@
+package io.github.moehreag.mojmap_patcher.api.data;
+
+public record Member(String owner, String name, String descriptor) {
+}

src/main/java/io/github/moehreag/mojmap_patcher/api/data/Method.java

@@ -1,4 +0,0 @@
-package io.github.moehreag.mojmap_patcher.api.data;
-
-public record Method(int startLine, int endLine, String returnType, String name, String descriptor) {
-}

src/main/java/io/github/moehreag/mojmap_patcher/parser/ProguardParser.java

@@ -1,11 +1,14 @@
 package io.github.moehreag.mojmap_patcher.parser;
 
 import io.github.moehreag.mojmap_patcher.Constants;
-import io.github.moehreag.mojmap_patcher.api.data.Field;
+import io.github.moehreag.mojmap_patcher.api.data.Member;
 import io.github.moehreag.mojmap_patcher.api.data.MappingData;
-import io.github.moehreag.mojmap_patcher.api.data.Method;
 
+import java.util.Arrays;
 import java.util.HashMap;
+import java.util.Map;
+import java.util.stream.Collectors;
+import java.util.stream.StreamSupport;
 
 public class ProguardParser {
 
@@ -15,32 +18,87 @@ public class ProguardParser {
         MappingData data = new MappingData();
         String currentClass = null;
         for (String line : lines) {
-            if (line.startsWith("#")) { // Filter out comments
+            if (line.contains("#")) {
+                line = line.substring(0, line.indexOf('#'));
+            }
+
+            line = line.trim();
+
+            if (line.isEmpty()) {
                 continue;
             }
 
-            String[] mapping = line.split("->");
+            int arrowIndex = line.indexOf("->");
-            String deobf = mapping[0].trim();
+            if (arrowIndex == -1) {
-            String obf = mapping[1].trim();
+                throw new IllegalStateException("Missing arrow in mapping");
-            if (line.startsWith("    ")) { // It's a field/method mapping
-                if (currentClass == null) {
-                    throw new IllegalStateException("Field/Method mapping outside a class");
             }
-                if (Constants.METHOD_PATTERN.matcher(deobf).matches()) {
+
-                    String[] method = deobf.split(":");
+            String obf = line.substring(0, arrowIndex).trim();
-                    String[] descriptor = method[2].split(" ");
+            String deobf = line.substring(arrowIndex + 2).trim();
-                    int bracket = descriptor[1].indexOf("(");
+
-                    data.classMethods().computeIfAbsent(currentClass, s -> new HashMap<>()).put(new Method(Integer.parseInt(method[0]), Integer.parseInt(method[1]), obf, descriptor[1].substring(0, bracket), descriptor[1].substring(bracket + 1)),
+            if (line.endsWith(":")) {
-                            new Method(Integer.parseInt(method[0]), Integer.parseInt(method[1]), descriptor[0], descriptor[1].substring(0, bracket), descriptor[1].substring(bracket + 1)));
+                deobf = deobf.substring(0, deobf.length() - 1);
+                currentClass = obf.replace('.', '/');
+                data.classes().put(currentClass, deobf.replace('.', '/'));
             } else {
-                    String[] field = deobf.split(" ");
+                if (currentClass == null) {
-                    data.classFields().computeIfAbsent(currentClass, s -> new HashMap<>()).put(new Field(field[1], obf), new Field(field[1], field[0]));
+                    throw new IllegalStateException("Member mapping specified before a class");
                 }
-            } else { // It's a class mapping
+
-                currentClass = deobf;
+                int spaceIndex = obf.indexOf(' ');
-                data.classes().put(obf, deobf);
+                if (spaceIndex == -1) {
+                    throw new IllegalStateException("Missing member signature");
+                }
+
+                String type = obf.substring(0, spaceIndex);
+                String signature = obf.substring(spaceIndex + 1);
+
+                int colonIndex = type.lastIndexOf(':');
+                if (colonIndex != -1)
+                    type = type.substring(colonIndex + 1);
+
+                if (signature.contains("(") && signature.endsWith(")")) {
+                    // method
+                    String name = signature.substring(0, signature.indexOf('('));
+                    String args = signature.substring(signature.indexOf('(') + 1, signature.length() - 1);
+                    StringBuilder descriptor = new StringBuilder();
+                    descriptor.append('(');
+                    if (!args.isEmpty()) {
+                        for (String arg : args.split(",")) {
+                            descriptor.append(convertType(arg));
+                        }
+                    }
+                    descriptor.append(')');
+                    descriptor.append(convertType(type));
+
+                    data.methods().put(new Member(currentClass, name, descriptor.toString()), deobf);
+                } else
+                    data.fields().put(new Member(currentClass, signature, convertType(type)), deobf);
             }
         }
         return data;
     }
+
+    private static String convertType(String type) {
+        int dimensions = 0;
+        while (type.endsWith("[]")) {
+            type = type.substring(0, type.length() - 2);
+            ++dimensions;
+        }
+
+        String result = switch (type) {
+            case "void" -> "V";
+            case "boolean" -> "Z";
+            case "byte" -> "B";
+            case "short" -> "S";
+            case "int" -> "I";
+            case "long" -> "J";
+            case "float" -> "F";
+            case "double" -> "D";
+            case "char" -> "C";
+            default -> 'L' + type.replace('.', '/') + ';';
+        };
+
+        return "[".repeat(dimensions) + result;
+    }
 }