From ad53f9a78d5e8366f7cb6d0e3745ce043c179315 Mon Sep 17 00:00:00 2001
From: Graham <gpe@openrs2.dev>
Date: Mon, 2 Mar 2020 19:53:26 +0000
Subject: [PATCH] Sort methods

Fernflower was previously placing constructors in the middle of instance
methods. They look much nicer at the top.

This commit also ensures static methods appear before instance methods.
---
 .../java/dev/openrs2/deob/Deobfuscator.kt     |  2 +
 .../deob/transform/MethodOrderTransformer.kt  | 37 +++++++++++++++++++
 2 files changed, 39 insertions(+)
 create mode 100644 deob/src/main/java/dev/openrs2/deob/transform/MethodOrderTransformer.kt

diff --git a/deob/src/main/java/dev/openrs2/deob/Deobfuscator.kt b/deob/src/main/java/dev/openrs2/deob/Deobfuscator.kt
index c7b2b7eb..4c31c1e9 100644
--- a/deob/src/main/java/dev/openrs2/deob/Deobfuscator.kt
+++ b/deob/src/main/java/dev/openrs2/deob/Deobfuscator.kt
@@ -21,6 +21,7 @@ import dev.openrs2.deob.transform.ExceptionTracingTransformer
 import dev.openrs2.deob.transform.FieldOrderTransformer
 import dev.openrs2.deob.transform.FinalTransformer
 import dev.openrs2.deob.transform.InvokeSpecialTransformer
+import dev.openrs2.deob.transform.MethodOrderTransformer
 import dev.openrs2.deob.transform.OpaquePredicateTransformer
 import dev.openrs2.deob.transform.OriginalNameTransformer
 import dev.openrs2.deob.transform.OverrideTransformer
@@ -170,6 +171,7 @@ class Deobfuscator(private val input: Path, private val output: Path) {
             InvokeSpecialTransformer(),
             StaticScramblingTransformer(),
             EmptyClassTransformer(),
+            MethodOrderTransformer(),
             VisibilityTransformer(),
             OverrideTransformer()
         )
diff --git a/deob/src/main/java/dev/openrs2/deob/transform/MethodOrderTransformer.kt b/deob/src/main/java/dev/openrs2/deob/transform/MethodOrderTransformer.kt
new file mode 100644
index 00000000..d47464b1
--- /dev/null
+++ b/deob/src/main/java/dev/openrs2/deob/transform/MethodOrderTransformer.kt
@@ -0,0 +1,37 @@
+package dev.openrs2.deob.transform
+
+import dev.openrs2.asm.classpath.ClassPath
+import dev.openrs2.asm.classpath.Library
+import dev.openrs2.asm.transform.Transformer
+import org.objectweb.asm.Opcodes
+import org.objectweb.asm.tree.ClassNode
+import org.objectweb.asm.tree.MethodNode
+
+class MethodOrderTransformer : Transformer() {
+    override fun transformClass(classPath: ClassPath, library: Library, clazz: ClassNode): Boolean {
+        clazz.methods.sortWith(STATIC_COMPARATOR.then(INIT_COMPARATOR))
+        return false
+    }
+
+    companion object {
+        private val STATIC_COMPARATOR = Comparator<MethodNode> { a, b ->
+            val aStatic = a.access and Opcodes.ACC_STATIC != 0
+            val bStatic = b.access and Opcodes.ACC_STATIC != 0
+            when {
+                aStatic && !bStatic -> -1
+                !aStatic && bStatic -> 1
+                else -> 0
+            }
+        }
+
+        private val INIT_COMPARATOR = Comparator<MethodNode> { a, b ->
+            val aInit = a.name.startsWith('<')
+            val bInit = b.name.startsWith('<')
+            when {
+                aInit && !bInit -> -1
+                !aInit && bInit -> 1
+                else -> 0
+            }
+        }
+    }
+}