Update 4_apis.md

Some APIs have been slightly changed and docs have been added.

BREAKING CHANGE: Various APIs have been changed.

CHANGELOG.md

@@ -1,3 +1,17 @@
+## [20.0.2](https://github.com/ReVanced/revanced-patcher/compare/v20.0.1...v20.0.2) (2024-10-17)
+
+
+### Bug Fixes
+
+* Make it work on Android 12 and lower by using existing APIs ([#312](https://github.com/ReVanced/revanced-patcher/issues/312)) ([a44802e](https://github.com/ReVanced/revanced-patcher/commit/a44802ef4ebf59ae47213854ba761c81dadc51f3))
+
+## [20.0.2-dev.1](https://github.com/ReVanced/revanced-patcher/compare/v20.0.1...v20.0.2-dev.1) (2024-10-15)
+
+
+### Bug Fixes
+
+* Make it work on Android 12 and lower by using existing APIs ([#312](https://github.com/ReVanced/revanced-patcher/issues/312)) ([a44802e](https://github.com/ReVanced/revanced-patcher/commit/a44802ef4ebf59ae47213854ba761c81dadc51f3))
+
 ## [20.0.1](https://github.com/ReVanced/revanced-patcher/compare/v20.0.0...v20.0.1) (2024-10-13)
 
 

api/revanced-patcher.api

@@ -1,7 +1,4 @@
 public final class app/revanced/patcher/Fingerprint {
-	public final fun getMatch ()Lapp/revanced/patcher/Match;
-	public final fun match (Lapp/revanced/patcher/patch/BytecodePatchContext;Lcom/android/tools/smali/dexlib2/iface/ClassDef;)Z
-	public final fun match (Lapp/revanced/patcher/patch/BytecodePatchContext;Lcom/android/tools/smali/dexlib2/iface/Method;)Z
 }
 
 public final class app/revanced/patcher/FingerprintBuilder {
@@ -18,20 +15,17 @@ public final class app/revanced/patcher/FingerprintBuilder {
 
 public final class app/revanced/patcher/FingerprintKt {
 	public static final fun fingerprint (ILkotlin/jvm/functions/Function1;)Lapp/revanced/patcher/Fingerprint;
-	public static final fun fingerprint (Lapp/revanced/patcher/patch/BytecodePatchBuilder;ILkotlin/jvm/functions/Function1;)Lapp/revanced/patcher/patch/BytecodePatchBuilder$InvokedFingerprint;
 	public static synthetic fun fingerprint$default (ILkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lapp/revanced/patcher/Fingerprint;
-	public static synthetic fun fingerprint$default (Lapp/revanced/patcher/patch/BytecodePatchBuilder;ILkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lapp/revanced/patcher/patch/BytecodePatchBuilder$InvokedFingerprint;
 }
 
 public abstract interface annotation class app/revanced/patcher/InternalApi : java/lang/annotation/Annotation {
 }
 
 public final class app/revanced/patcher/Match {
-	public fun <init> (Lcom/android/tools/smali/dexlib2/iface/Method;Lcom/android/tools/smali/dexlib2/iface/ClassDef;Lapp/revanced/patcher/Match$PatternMatch;Ljava/util/List;Lapp/revanced/patcher/patch/BytecodePatchContext;)V
-	public final fun getClassDef ()Lcom/android/tools/smali/dexlib2/iface/ClassDef;
-	public final fun getMethod ()Lcom/android/tools/smali/dexlib2/iface/Method;
-	public final fun getMutableClass ()Lapp/revanced/patcher/util/proxy/mutableTypes/MutableClass;
-	public final fun getMutableMethod ()Lapp/revanced/patcher/util/proxy/mutableTypes/MutableMethod;
+	public final fun getClassDef ()Lapp/revanced/patcher/util/proxy/mutableTypes/MutableClass;
+	public final fun getMethod ()Lapp/revanced/patcher/util/proxy/mutableTypes/MutableMethod;
+	public final fun getOriginalClassDef ()Lcom/android/tools/smali/dexlib2/iface/ClassDef;
+	public final fun getOriginalMethod ()Lcom/android/tools/smali/dexlib2/iface/Method;
 	public final fun getPatternMatch ()Lapp/revanced/patcher/Match$PatternMatch;
 	public final fun getStringMatches ()Ljava/util/List;
 }
@@ -63,8 +57,8 @@ public final class app/revanced/patcher/Patcher : java/io/Closeable {
 }
 
 public final class app/revanced/patcher/PatcherConfig {
-	public fun <init> (Ljava/io/File;Ljava/io/File;Ljava/lang/String;Ljava/lang/String;Z)V
-	public synthetic fun <init> (Ljava/io/File;Ljava/io/File;Ljava/lang/String;Ljava/lang/String;ZILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public fun <init> (Ljava/io/File;Ljava/io/File;Ljava/lang/String;Ljava/lang/String;)V
+	public synthetic fun <init> (Ljava/io/File;Ljava/io/File;Ljava/lang/String;Ljava/lang/String;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
 }
 
 public final class app/revanced/patcher/PatcherContext : java/io/Closeable {
@@ -135,31 +129,28 @@ public final class app/revanced/patcher/extensions/InstructionExtensions {
 }
 
 public final class app/revanced/patcher/patch/BytecodePatch : app/revanced/patcher/patch/Patch {
-	public final fun getExtension ()Ljava/io/InputStream;
-	public final fun getFingerprints ()Ljava/util/Set;
+	public final fun getExtensionInputStream ()Ljava/util/function/Supplier;
 	public fun toString ()Ljava/lang/String;
 }
 
 public final class app/revanced/patcher/patch/BytecodePatchBuilder : app/revanced/patcher/patch/PatchBuilder {
 	public synthetic fun build$revanced_patcher ()Lapp/revanced/patcher/patch/Patch;
 	public final fun extendWith (Ljava/lang/String;)Lapp/revanced/patcher/patch/BytecodePatchBuilder;
-	public final fun getExtension ()Ljava/io/InputStream;
-	public final fun invoke (Lapp/revanced/patcher/Fingerprint;)Lapp/revanced/patcher/patch/BytecodePatchBuilder$InvokedFingerprint;
-	public final fun setExtension (Ljava/io/InputStream;)V
-}
-
-public final class app/revanced/patcher/patch/BytecodePatchBuilder$InvokedFingerprint {
-	public final fun getValue (Ljava/lang/Void;Lkotlin/reflect/KProperty;)Lapp/revanced/patcher/Match;
+	public final fun getExtensionInputStream ()Ljava/util/function/Supplier;
+	public final fun setExtensionInputStream (Ljava/util/function/Supplier;)V
 }
 
 public final class app/revanced/patcher/patch/BytecodePatchContext : app/revanced/patcher/patch/PatchContext, java/io/Closeable {
 	public final fun classBy (Lkotlin/jvm/functions/Function1;)Lapp/revanced/patcher/util/proxy/ClassProxy;
-	public final fun classByType (Ljava/lang/String;)Lapp/revanced/patcher/util/proxy/ClassProxy;
 	public fun close ()V
 	public synthetic fun get ()Ljava/lang/Object;
 	public fun get ()Ljava/util/Set;
 	public final fun getClasses ()Lapp/revanced/patcher/util/ProxyClassList;
-	public final fun navigate (Lcom/android/tools/smali/dexlib2/iface/Method;)Lapp/revanced/patcher/util/MethodNavigator;
+	public final fun getMatch (Lapp/revanced/patcher/Fingerprint;)Lapp/revanced/patcher/Match;
+	public final fun getValue (Lapp/revanced/patcher/Fingerprint;Ljava/lang/Void;Lkotlin/reflect/KProperty;)Lapp/revanced/patcher/Match;
+	public final fun match (Lapp/revanced/patcher/Fingerprint;Lcom/android/tools/smali/dexlib2/iface/ClassDef;)Lapp/revanced/patcher/Match;
+	public final fun match (Lapp/revanced/patcher/Fingerprint;Lcom/android/tools/smali/dexlib2/iface/Method;)Lapp/revanced/patcher/Match;
+	public final fun navigate (Lcom/android/tools/smali/dexlib2/iface/reference/MethodReference;)Lapp/revanced/patcher/util/MethodNavigator;
 	public final fun proxy (Lcom/android/tools/smali/dexlib2/iface/ClassDef;)Lapp/revanced/patcher/util/proxy/ClassProxy;
 }
 
@@ -286,7 +277,7 @@ public final class app/revanced/patcher/patch/Options : java/util/Map, kotlin/jv
 }
 
 public abstract class app/revanced/patcher/patch/Patch {
-	public synthetic fun <init> (Ljava/lang/String;Ljava/lang/String;ZLjava/util/Set;Ljava/util/Set;Ljava/util/Set;Lkotlin/jvm/functions/Function2;Lkotlin/jvm/functions/Function2;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public synthetic fun <init> (Ljava/lang/String;Ljava/lang/String;ZLjava/util/Set;Ljava/util/Set;Ljava/util/Set;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/functions/Function1;Lkotlin/jvm/internal/DefaultConstructorMarker;)V
 	public final fun execute (Lapp/revanced/patcher/patch/PatchContext;)V
 	public final fun finalize (Lapp/revanced/patcher/patch/PatchContext;)V
 	public final fun getCompatiblePackages ()Ljava/util/Set;
@@ -303,13 +294,13 @@ public abstract class app/revanced/patcher/patch/PatchBuilder {
 	public final fun compatibleWith ([Ljava/lang/String;)V
 	public final fun compatibleWith ([Lkotlin/Pair;)V
 	public final fun dependsOn ([Lapp/revanced/patcher/patch/Patch;)V
-	public final fun execute (Lkotlin/jvm/functions/Function2;)V
-	public final fun finalize (Lkotlin/jvm/functions/Function2;)V
+	public final fun execute (Lkotlin/jvm/functions/Function1;)V
+	public final fun finalize (Lkotlin/jvm/functions/Function1;)V
 	protected final fun getCompatiblePackages ()Ljava/util/Set;
 	protected final fun getDependencies ()Ljava/util/Set;
 	protected final fun getDescription ()Ljava/lang/String;
-	protected final fun getExecutionBlock ()Lkotlin/jvm/functions/Function2;
-	protected final fun getFinalizeBlock ()Lkotlin/jvm/functions/Function2;
+	protected final fun getExecutionBlock ()Lkotlin/jvm/functions/Function1;
+	protected final fun getFinalizeBlock ()Lkotlin/jvm/functions/Function1;
 	protected final fun getName ()Ljava/lang/String;
 	protected final fun getOptions ()Ljava/util/Set;
 	protected final fun getUse ()Z
@@ -317,8 +308,8 @@ public abstract class app/revanced/patcher/patch/PatchBuilder {
 	public final fun invoke (Ljava/lang/String;[Ljava/lang/String;)Lkotlin/Pair;
 	protected final fun setCompatiblePackages (Ljava/util/Set;)V
 	protected final fun setDependencies (Ljava/util/Set;)V
-	protected final fun setExecutionBlock (Lkotlin/jvm/functions/Function2;)V
-	protected final fun setFinalizeBlock (Lkotlin/jvm/functions/Function2;)V
+	protected final fun setExecutionBlock (Lkotlin/jvm/functions/Function1;)V
+	protected final fun setFinalizeBlock (Lkotlin/jvm/functions/Function1;)V
 }
 
 public abstract interface class app/revanced/patcher/patch/PatchContext : java/util/function/Supplier {
@@ -395,18 +386,13 @@ public final class app/revanced/patcher/patch/ResourcePatchBuilder : app/revance
 }
 
 public final class app/revanced/patcher/patch/ResourcePatchContext : app/revanced/patcher/patch/PatchContext {
+	public final fun delete (Ljava/lang/String;)Z
+	public final fun document (Ljava/io/InputStream;)Lapp/revanced/patcher/util/Document;
+	public final fun document (Ljava/lang/String;)Lapp/revanced/patcher/util/Document;
 	public fun get ()Lapp/revanced/patcher/PatcherResult$PatchedResources;
 	public synthetic fun get ()Ljava/lang/Object;
 	public final fun get (Ljava/lang/String;Z)Ljava/io/File;
 	public static synthetic fun get$default (Lapp/revanced/patcher/patch/ResourcePatchContext;Ljava/lang/String;ZILjava/lang/Object;)Ljava/io/File;
-	public final fun getDocument ()Lapp/revanced/patcher/patch/ResourcePatchContext$DocumentOperatable;
-	public final fun stageDelete (Lkotlin/jvm/functions/Function1;)Z
-}
-
-public final class app/revanced/patcher/patch/ResourcePatchContext$DocumentOperatable {
-	public fun <init> (Lapp/revanced/patcher/patch/ResourcePatchContext;)V
-	public final fun get (Ljava/io/InputStream;)Lapp/revanced/patcher/util/Document;
-	public final fun get (Ljava/lang/String;)Lapp/revanced/patcher/util/Document;
 }
 
 public final class app/revanced/patcher/util/Document : java/io/Closeable, org/w3c/dom/Document {
@@ -485,8 +471,9 @@ public final class app/revanced/patcher/util/MethodNavigator {
 	public final fun at (ILkotlin/jvm/functions/Function1;)Lapp/revanced/patcher/util/MethodNavigator;
 	public final fun at ([I)Lapp/revanced/patcher/util/MethodNavigator;
 	public static synthetic fun at$default (Lapp/revanced/patcher/util/MethodNavigator;ILkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lapp/revanced/patcher/util/MethodNavigator;
-	public final fun immutable ()Lcom/android/tools/smali/dexlib2/iface/Method;
-	public final fun mutable ()Lapp/revanced/patcher/util/proxy/mutableTypes/MutableMethod;
+	public final fun getValue (Ljava/lang/Void;Lkotlin/reflect/KProperty;)Lapp/revanced/patcher/util/proxy/mutableTypes/MutableMethod;
+	public final fun original ()Lcom/android/tools/smali/dexlib2/iface/Method;
+	public final fun stop ()Lapp/revanced/patcher/util/proxy/mutableTypes/MutableMethod;
 }
 
 public final class app/revanced/patcher/util/ProxyClassList : java/util/List, kotlin/jvm/internal/markers/KMutableList {

docs/2_1_setup.md

@@ -72,6 +72,10 @@ To start developing patches with ReVanced Patcher, you must prepare a developmen
 
 Throughout the documentation, [ReVanced Patches](https://github.com/revanced/revanced-patches) will be used as an example project.
 
+> [!NOTE]
+> To start a fresh project, 
+> you can use the [ReVanced Patches template](https://github.com/revanced/revanced-patches-template).
+
 1. Clone the repository
 
    ```bash

docs/2_2_patch_anatomy.md

@@ -76,23 +76,23 @@ val disableAdsPatch = bytecodePatch(
 ) { 
     compatibleWith("com.some.app"("1.0.0"))
     
-    // Resource patch disables ads by patching resource files.
+    // Patches can depend on other patches, executing them first.
     dependsOn(disableAdsResourcePatch)
 
-    // Precompiled DEX file to be merged into the patched app.
+    // Merge precompiled DEX files into the patched app, before the patch is executed.
     extendWith("disable-ads.rve")
-
-    // Fingerprint to find the method to patch.
-    val showAdsMatch by showAdsFingerprint {
-        // More about fingerprints on the next page of the documentation.
-    }
     
     // Business logic of the patch to disable ads in the app.
     execute {
+        // Fingerprint to find the method to patch.
+        val showAdsMatch by showAdsFingerprint {
+          // More about fingerprints on the next page of the documentation.
+        }
+      
         // In the method that shows ads,
         // call DisableAdsPatch.shouldDisableAds() from the extension (precompiled DEX file)
         // to enable or disable ads.
-        showAdsMatch.mutableMethod.addInstructions(
+        showAdsMatch.method.addInstructions(
             0,
             """
                 invoke-static {}, LDisableAdsPatch;->shouldDisableAds()Z
@@ -146,10 +146,10 @@ loadPatchesJar(patches).apply {
 The type of an option can be obtained from the `type` property of the option:
 
 ```kt
-option.type // The KType of the option.
+option.type // The KType of the option. Captures the full type information of the option.
 ```
 
-Options can be declared outside of a patch and added to a patch manually:
+Options can be declared outside a patch and added to a patch manually:
 
 ```kt
 val option = stringOption(key = "option")
@@ -183,11 +183,9 @@ and use it in a patch:
 ```kt
 val patch = bytecodePatch(name = "Complex patch") {
     extendWith("complex-patch.rve")
-    
-    val match by methodFingerprint()
-    
+  
     execute { 
-        match.mutableMethod.addInstructions(0, "invoke-static { }, LComplexPatch;->doSomething()V")
+        fingerprint.match!!.mutableMethod.addInstructions(0, "invoke-static { }, LComplexPatch;->doSomething()V")
     }
 }
 ```

docs/2_patches_intro.md

@@ -96,21 +96,21 @@ Example of patches:
 @Surpress("unused")
 val bytecodePatch = bytecodePatch {
     execute { 
-        // TODO
+        // More about this on the next page of the documentation.
     }
 }
 
 @Surpress("unused")
 val rawResourcePatch = rawResourcePatch {
-    execute { 
-        // TODO
+    execute {
+        // More about this on the next page of the documentation.
     }
 }
 
 @Surpress("unused")
 val resourcePatch = resourcePatch {
-    execute { 
-        // TODO
+    execute {
+        // More about this on the next page of the documentation.
     }
 }
 ```

docs/4_apis.md

@@ -4,18 +4,107 @@ A handful of APIs are available to make patch development easier and more effici
 
 ## 📙 Overview
 
-1. 👹 Mutate classes with `context.proxy(ClassDef)`
-2. 🔍 Find and proxy existing classes with `classBy(Predicate)` and `classByType(String)`
-3. 🏃‍ Easily access referenced methods recursively by index with `MethodNavigator`
-4. 🔨 Make use of extension functions from `BytecodeUtils` and `ResourceUtils` with certain applications
-(Available in ReVanced Patches)
-5. 💾 Read and write (decoded) resources with `ResourcePatchContext.get(Path, Boolean)`
-6. 📃 Read and write DOM files using `ResourcePatchContext.document`
+1. 👹 Create mutable replacements of classes with `proxy(ClassDef)`
+2. 🔍 Find and create mutable replaces with `classBy(Predicate)`
+3. 🏃‍ Navigate method calls recursively by index with `navigate(Method)`
+4. 💾 Read and write resource files with `get(String, Boolean)` and `delete(String)`
+5. 📃 Read and write DOM files using `document(String)` and  `document(InputStream)`
 
 ### 🧰 APIs
 
-> [!WARNING]
-> This section is still under construction and may be incomplete.
+#### 👹 `proxy(ClassDef)`
+
+By default, the classes are immutable, meaning they cannot be modified.
+To make a class mutable, use the `proxy(ClassDef)` function.
+This function creates a lazy mutable copy of the class definition.
+Accessing the property will replace the original class definition with the mutable copy,
+thus allowing you to make changes to the class. Subsequent accesses will return the same mutable copy.
+
+```kt
+execute {
+    val mutableClass = proxy(classDef)
+    mutableClass.methods.add(Method())
+}
+```
+
+#### 🔍 `classBy(Predicate)`
+
+The `classBy(Predicate)` function is an alternative to finding and creating mutable classes by a predicate.
+It automatically proxies the class definition, making it mutable.
+
+```kt
+execute {
+    // Alternative to proxy(classes.find { it.name == "Lcom/example/MyClass;" })?.classDef
+    val classDef = classBy { it.name == "Lcom/example/MyClass;" }?.classDef
+}
+```
+
+#### 🏃‍ `navigate(Method).at(index)`
+
+The `navigate(Method)` function allows you to navigate method calls recursively by index.
+
+```kt
+execute {
+    // Sequentially navigate to the instructions at index 1 within 'someMethod'.
+    val method = navigate(someMethod).at(1).original() // original() returns the original immutable method.
+    
+    // Further navigate to the second occurrence where the instruction's opcode is 'INVOKEVIRTUAL'.
+    // stop() returns the mutable copy of the method.
+    val method = navigate(someMethod).at(2) { instruction -> instruction.opcode == Opcode.INVOKEVIRTUAL }.stop()
+    
+    // Alternatively, to stop(), you can delegate the method to a variable.
+    val method by navigate(someMethod).at(1)
+    
+    // You can chain multiple calls to at() to navigate deeper into the method.
+    val method by navigate(someMethod).at(1).at(2, 3, 4).at(5)
+}
+```
+
+#### 💾 `get(String, Boolean)` and `delete(String)`
+
+The `get(String, Boolean)` function returns a `File` object that can be used to read and write resource files.
+
+```kt
+execute {
+    val file = get("res/values/strings.xml")
+    val content = file.readText()
+    file.writeText(content)
+}
+```
+
+The `delete` function can mark files for deletion when the APK is rebuilt.
+
+```kt
+execute {
+    delete("res/values/strings.xml")
+}
+```
+
+#### 📃 `document(String)`  and  `document(InputStream)`
+
+The `document` function is used to read and write DOM files.
+
+```kt
+execute { 
+    document("res/values/strings.xml").use { document ->
+        val element = doc.createElement("string").apply {
+            textContent = "Hello, World!"
+        }
+        document.documentElement.appendChild(element)
+    }
+}
+```
+
+You can also read documents from an `InputStream`:
+
+```kt
+execute {
+    val inputStream = classLoader.getResourceAsStream("some.xml")
+    document(inputStream).use { document ->
+        // ...
+    }
+}
+```
 
 ## 🎉 Afterword
 

gradle.properties

@@ -1,3 +1,3 @@
 org.gradle.parallel = true
 org.gradle.caching = true
-version = 20.0.1
+version = 20.0.2

src/main/kotlin/app/revanced/patcher/Patcher.kt

@@ -91,19 +91,15 @@ class Patcher(private val config: PatcherConfig) : Closeable {
             }.also { executedPatches[this] = it }
         }
 
-        // Prevent from decoding the app manifest twice if it is not needed.
+        // Prevent decoding the app manifest twice if it is not needed.
         if (config.resourceMode != ResourcePatchContext.ResourceMode.NONE) {
             context.resourceContext.decodeResources(config.resourceMode)
         }
 
-        logger.info("Merging extensions")
+        logger.info("Initializing lookup maps")
 
-        with(context.bytecodeContext) {
-            context.executablePatches.mergeExtensions()
-
-            // Initialize lookup maps.
-           lookupMaps
-        }
+        // Accessing the lazy lookup maps to initialize them.
+        context.bytecodeContext.lookupMaps
 
         logger.info("Executing patches")
 

src/main/kotlin/app/revanced/patcher/PatcherConfig.kt

@@ -12,16 +12,12 @@ import java.util.logging.Logger
  * @param temporaryFilesPath A path to a folder to store temporary files in.
  * @param aaptBinaryPath A path to a custom aapt binary.
  * @param frameworkFileDirectory A path to the directory to cache the framework file in.
- * @param multithreadingDexFileWriter Whether to use multiple threads for writing dex files.
- * This has impact on memory usage and performance.
  */
 class PatcherConfig(
     internal val apkFile: File,
     private val temporaryFilesPath: File = File("revanced-temporary-files"),
     aaptBinaryPath: String? = null,
     frameworkFileDirectory: String? = null,
-    @Deprecated("This is going to be removed in the future because it is not needed anymore.")
-    internal val multithreadingDexFileWriter: Boolean = false,
 ) {
     private val logger = Logger.getLogger(PatcherConfig::class.java.name)
 

src/main/kotlin/app/revanced/patcher/PatcherResult.kt

@@ -29,12 +29,12 @@ class PatcherResult internal constructor(
      * @param resourcesApk The compiled resources.apk file.
      * @param otherResources The directory containing other resources files.
      * @param doNotCompress List of files that should not be compressed.
-     * @param deleteResources List of predicates about resources that should be deleted.
+     * @param deleteResources List of resources that should be deleted.
      */
     class PatchedResources internal constructor(
         val resourcesApk: File?,
         val otherResources: File?,
         val doNotCompress: Set<String>,
-        val deleteResources: Set<(String) -> Boolean>,
+        val deleteResources: Set<String>,
     )
 }

src/main/kotlin/app/revanced/patcher/patch/BytecodePatchContext.kt

@@ -1,8 +1,6 @@
 package app.revanced.patcher.patch
 
-import app.revanced.patcher.InternalApi
-import app.revanced.patcher.PatcherConfig
-import app.revanced.patcher.PatcherResult
+import app.revanced.patcher.*
 import app.revanced.patcher.extensions.InstructionExtensions.instructionsOrNull
 import app.revanced.patcher.util.ClassMerger.merge
 import app.revanced.patcher.util.MethodNavigator
@@ -14,6 +12,7 @@ import com.android.tools.smali.dexlib2.iface.ClassDef
 import com.android.tools.smali.dexlib2.iface.DexFile
 import com.android.tools.smali.dexlib2.iface.Method
 import com.android.tools.smali.dexlib2.iface.instruction.ReferenceInstruction
+import com.android.tools.smali.dexlib2.iface.reference.MethodReference
 import com.android.tools.smali.dexlib2.iface.reference.StringReference
 import lanchon.multidexlib2.BasicDexFileNamer
 import lanchon.multidexlib2.DexIO
@@ -23,6 +22,7 @@ import java.io.Closeable
 import java.io.FileFilter
 import java.util.*
 import java.util.logging.Logger
+import kotlin.reflect.KProperty
 
 /**
  * A context for patches containing the current state of the bytecode.
@@ -53,60 +53,74 @@ class BytecodePatchContext internal constructor(private val config: PatcherConfi
         ).also { opcodes = it.opcodes }.classes.toMutableList(),
     )
 
+    /**
+     * The match for this [Fingerprint]. Null if unmatched.
+     */
+    val Fingerprint.match get() = match(this@BytecodePatchContext)
+
+    /**
+     * Match using a [ClassDef].
+     *
+     * @param classDef The class to match against.
+     * @return The [Match] if a match was found or if the fingerprint is already matched to a method, null otherwise.
+     */
+    fun Fingerprint.match(classDef: ClassDef) = match(this@BytecodePatchContext, classDef)
+
+    /**
+     * Match using a [Method].
+     * The class is retrieved from the method.
+     *
+     * @param method The method to match against.
+     * @return The [Match] if a match was found or if the fingerprint is already matched to a method, null otherwise.
+     */
+    fun Fingerprint.match(method: Method) = match(this@BytecodePatchContext, method)
+
+    /**
+     * Get the match for this [Fingerprint].
+     *
+     * @throws IllegalStateException If the [Fingerprint] has not been matched.
+     */
+    operator fun Fingerprint.getValue(nothing: Nothing?, property: KProperty<*>): Match = _match
+        ?: throw PatchException("No fingerprint match to delegate to \"${property.name}\".")
+
     /**
      * The lookup maps for methods and the class they are a member of from the [classes].
      */
     internal val lookupMaps by lazy { LookupMaps(classes) }
 
     /**
-     * Merge the extensions for this set of patches.
+     * Merge the extension of [bytecodePatch] into the [BytecodePatchContext].
+     * If no extension is present, the function will return early.
+     *
+     * @param bytecodePatch The [BytecodePatch] to merge the extension of.
      */
-    internal fun Set<Patch<*>>.mergeExtensions() {
-        // Lookup map for fast checking if a class exists by its type.
-        val classesByType = mutableMapOf<String, ClassDef>().apply {
-            classes.forEach { classDef -> put(classDef.type, classDef) }
-        }
+    internal fun mergeExtension(bytecodePatch: BytecodePatch) {
+        bytecodePatch.extensionInputStream?.get()?.use { extensionStream ->
+            RawDexIO.readRawDexFile(extensionStream, 0, null).classes.forEach { classDef ->
+                val existingClass = lookupMaps.classesByType[classDef.type] ?: run {
+                    logger.fine("Adding class \"$classDef\"")
 
-        forEachRecursively { patch ->
-            if (patch is BytecodePatch && patch.extension != null) {
+                    classes += classDef
+                    lookupMaps.classesByType[classDef.type] = classDef
 
-                val extension = patch.extension.readAllBytes()
+                    return@forEach
+                }
 
-                RawDexIO.readRawDexFile(extension, 0, null).classes.forEach { classDef ->
-                    val existingClass = classesByType[classDef.type] ?: run {
-                        logger.fine("Adding class \"$classDef\"")
+                logger.fine("Class \"$classDef\" exists already. Adding missing methods and fields.")
 
-                        classes += classDef
-                        classesByType[classDef.type] = classDef
-
-                        return@forEach
+                existingClass.merge(classDef, this@BytecodePatchContext).let { mergedClass ->
+                    // If the class was merged, replace the original class with the merged class.
+                    if (mergedClass === existingClass) {
+                        return@let
                     }
 
-                    logger.fine("Class \"$classDef\" exists already. Adding missing methods and fields.")
-
-                    existingClass.merge(classDef, this@BytecodePatchContext).let { mergedClass ->
-                        // If the class was merged, replace the original class with the merged class.
-                        if (mergedClass === existingClass) {
-                            return@let
-                        }
-
-                        classes -= existingClass
-                        classes += mergedClass
-                    }
+                    classes -= existingClass
+                    classes += mergedClass
                 }
             }
-        }
+        } ?: logger.fine("No extension to merge")
     }
 
-    /**
-     * Find a class by its type using a contains check.
-     *
-     * @param type The type of the class.
-     * @return A proxy for the first class that matches the type.
-     */
-    @Deprecated("Use classBy { type in it.type } instead.", ReplaceWith("classBy { type in it.type }"))
-    fun classByType(type: String) = classBy { type in it.type }
-
     /**
      * Find a class with a predicate.
      *
@@ -134,7 +148,7 @@ class BytecodePatchContext internal constructor(private val config: PatcherConfi
      *
      * @return A [MethodNavigator] for the method.
      */
-    fun navigate(method: Method) = MethodNavigator(this@BytecodePatchContext, method)
+    fun navigate(method: MethodReference) = MethodNavigator(this@BytecodePatchContext, method)
 
     /**
      * Compile bytecode from the [BytecodePatchContext].
@@ -155,7 +169,7 @@ class BytecodePatchContext internal constructor(private val config: PatcherConfi
             }.apply {
                 MultiDexIO.writeDexFile(
                     true,
-                    if (config.multithreadingDexFileWriter) -1 else 1,
+                    -1,
                     this,
                     BasicDexFileNamer(),
                     object : DexFile {
@@ -186,6 +200,11 @@ class BytecodePatchContext internal constructor(private val config: PatcherConfi
          */
         internal val methodsByStrings = MethodClassPairsLookupMap()
 
+        // Lookup map for fast checking if a class exists by its type.
+        val classesByType = mutableMapOf<String, ClassDef>().apply {
+            classes.forEach { classDef -> put(classDef.type, classDef) }
+        }
+
         init {
             classes.forEach { classDef ->
                 classDef.methods.forEach { method ->
@@ -232,6 +251,7 @@ class BytecodePatchContext internal constructor(private val config: PatcherConfi
 
         override fun close() {
             methodsByStrings.clear()
+            classesByType.clear()
         }
     }
 

src/main/kotlin/app/revanced/patcher/patch/Patch.kt

@@ -2,7 +2,6 @@
 
 package app.revanced.patcher.patch
 
-import app.revanced.patcher.Fingerprint
 import app.revanced.patcher.Patcher
 import app.revanced.patcher.PatcherContext
 import dalvik.system.DexClassLoader
@@ -14,8 +13,8 @@ import java.lang.reflect.Member
 import java.lang.reflect.Method
 import java.lang.reflect.Modifier
 import java.net.URLClassLoader
+import java.util.function.Supplier
 import java.util.jar.JarFile
-import kotlin.reflect.KProperty
 
 typealias PackageName = String
 typealias VersionName = String
@@ -46,10 +45,10 @@ sealed class Patch<C : PatchContext<*>>(
     val dependencies: Set<Patch<*>>,
     val compatiblePackages: Set<Package>?,
     options: Set<Option<*>>,
-    private val executeBlock: Patch<C>.(C) -> Unit,
+    private val executeBlock: (C) -> Unit,
     // Must be internal and nullable, so that Patcher.invoke can check,
     // if a patch has a finalizing block in order to not emit it twice.
-    internal var finalizeBlock: (Patch<C>.(C) -> Unit)?,
+    internal var finalizeBlock: ((C) -> Unit)?,
 ) {
     /**
      * The options of the patch.
@@ -57,35 +56,35 @@ sealed class Patch<C : PatchContext<*>>(
     val options = Options(options)
 
     /**
-     * Runs the execution block of the patch.
-     * Called by [Patcher].
+     * Calls the execution block of the patch.
+     * This function is called by [Patcher.invoke].
      *
      * @param context The [PatcherContext] to get the [PatchContext] from to execute the patch with.
      */
     internal abstract fun execute(context: PatcherContext)
 
     /**
-     * Runs the execution block of the patch.
+     * Calls the execution block of the patch.
      *
      * @param context The [PatchContext] to execute the patch with.
      */
     fun execute(context: C) = executeBlock(context)
 
     /**
-     * Runs the finalizing block of the patch.
-     * Called by [Patcher].
+     * Calls the finalizing block of the patch.
+     * This function is called by [Patcher.invoke].
      *
      * @param context The [PatcherContext] to get the [PatchContext] from to finalize the patch with.
      */
     internal abstract fun finalize(context: PatcherContext)
 
     /**
-     * Runs the finalizing block of the patch.
+     * Calls the finalizing block of the patch.
      *
      * @param context The [PatchContext] to finalize the patch with.
      */
     fun finalize(context: C) {
-        finalizeBlock?.invoke(this, context)
+        finalizeBlock?.invoke(context)
     }
 
     override fun toString() = name ?: "Patch"
@@ -127,8 +126,7 @@ internal fun Iterable<Patch<*>>.forEachRecursively(
  * If null, the patch is compatible with all packages.
  * @param dependencies Other patches this patch depends on.
  * @param options The options of the patch.
- * @param fingerprints The fingerprints that are resolved before the patch is executed.
- * @property extension An input stream of the extension resource this patch uses.
+ * @property extensionInputStream Getter for the extension input stream of the patch.
  * An extension is a precompiled DEX file that is merged into the patched app before this patch is executed.
  * @param executeBlock The execution block of the patch.
  * @param finalizeBlock The finalizing block of the patch. Called after all patches have been executed,
@@ -143,10 +141,9 @@ class BytecodePatch internal constructor(
     compatiblePackages: Set<Package>?,
     dependencies: Set<Patch<*>>,
     options: Set<Option<*>>,
-    val fingerprints: Set<Fingerprint>,
-    val extension: InputStream?,
-    executeBlock: Patch<BytecodePatchContext>.(BytecodePatchContext) -> Unit,
-    finalizeBlock: (Patch<BytecodePatchContext>.(BytecodePatchContext) -> Unit)?,
+    val extensionInputStream: Supplier<InputStream>?,
+    executeBlock: (BytecodePatchContext) -> Unit,
+    finalizeBlock: ((BytecodePatchContext) -> Unit)?,
 ) : Patch<BytecodePatchContext>(
     name,
     description,
@@ -158,8 +155,7 @@ class BytecodePatch internal constructor(
     finalizeBlock,
 ) {
     override fun execute(context: PatcherContext) = with(context.bytecodeContext) {
-        fingerprints.forEach { it.match(this) }
-
+        mergeExtension(this@BytecodePatch)
         execute(this)
     }
 
@@ -192,8 +188,8 @@ class RawResourcePatch internal constructor(
     compatiblePackages: Set<Package>?,
     dependencies: Set<Patch<*>>,
     options: Set<Option<*>>,
-    executeBlock: Patch<ResourcePatchContext>.(ResourcePatchContext) -> Unit,
-    finalizeBlock: (Patch<ResourcePatchContext>.(ResourcePatchContext) -> Unit)?,
+    executeBlock: (ResourcePatchContext) -> Unit,
+    finalizeBlock: ((ResourcePatchContext) -> Unit)?,
 ) : Patch<ResourcePatchContext>(
     name,
     description,
@@ -235,8 +231,8 @@ class ResourcePatch internal constructor(
     compatiblePackages: Set<Package>?,
     dependencies: Set<Patch<*>>,
     options: Set<Option<*>>,
-    executeBlock: Patch<ResourcePatchContext>.(ResourcePatchContext) -> Unit,
-    finalizeBlock: (Patch<ResourcePatchContext>.(ResourcePatchContext) -> Unit)?,
+    executeBlock: (ResourcePatchContext) -> Unit,
+    finalizeBlock: ((ResourcePatchContext) -> Unit)?,
 ) : Patch<ResourcePatchContext>(
     name,
     description,
@@ -281,8 +277,8 @@ sealed class PatchBuilder<C : PatchContext<*>>(
     protected var dependencies = mutableSetOf<Patch<*>>()
     protected val options = mutableSetOf<Option<*>>()
 
-    protected var executionBlock: (Patch<C>.(C) -> Unit) = { }
-    protected var finalizeBlock: (Patch<C>.(C) -> Unit)? = null
+    protected var executionBlock: ((C) -> Unit) = { }
+    protected var finalizeBlock: ((C) -> Unit)? = null
 
     /**
      * Add an option to the patch.
@@ -341,7 +337,7 @@ sealed class PatchBuilder<C : PatchContext<*>>(
      *
      * @param block The execution block of the patch.
      */
-    fun execute(block: Patch<C>.(C) -> Unit) {
+    fun execute(block: C.() -> Unit) {
         executionBlock = block
     }
 
@@ -350,7 +346,7 @@ sealed class PatchBuilder<C : PatchContext<*>>(
      *
      * @param block The finalizing block of the patch.
      */
-    fun finalize(block: Patch<C>.(C) -> Unit) {
+    fun finalize(block: C.() -> Unit) {
         finalizeBlock = block
     }
 
@@ -379,8 +375,7 @@ private fun <B : PatchBuilder<*>> B.buildPatch(block: B.() -> Unit = {}) = apply
  * If null, the patch is named "Patch" and will not be loaded by [PatchLoader].
  * @param description The description of the patch.
  * @param use Weather or not the patch should be used.
- * @property fingerprints The fingerprints that are resolved before the patch is executed.
- * @property extension An input stream of the extension resource this patch uses.
+ * @property extensionInputStream Getter for the extension input stream of the patch.
  * An extension is a precompiled DEX file that is merged into the patched app before this patch is executed.
  *
  * @constructor Create a new [BytecodePatchBuilder] builder.
@@ -390,27 +385,9 @@ class BytecodePatchBuilder internal constructor(
     description: String?,
     use: Boolean,
 ) : PatchBuilder<BytecodePatchContext>(name, description, use) {
-    private val fingerprints = mutableSetOf<Fingerprint>()
-
-    /**
-     * Add the fingerprint to the patch.
-     *
-     * @return A wrapper for the fingerprint with the ability to delegate the match to the fingerprint.
-     */
-    operator fun Fingerprint.invoke() = InvokedFingerprint(also { fingerprints.add(it) })
-
-    class InvokedFingerprint internal constructor(private val fingerprint: Fingerprint) {
-        // The reason getValue isn't extending the Fingerprint class is
-        // because delegating makes only sense if the fingerprint was previously added to the patch by invoking it.
-        // It may be likely to forget invoking it. By wrapping the fingerprint into this class,
-        // the compiler will throw an error if the fingerprint was not invoked if attempting to delegate the match.
-        operator fun getValue(nothing: Nothing?, property: KProperty<*>) = fingerprint.match
-            ?: throw PatchException("No fingerprint match to delegate to \"${property.name}\".")
-    }
-
     // Must be internal for the inlined function "extendWith".
     @PublishedApi
-    internal var extension: InputStream? = null
+    internal var extensionInputStream: Supplier<InputStream>? = null
 
     // Inlining is necessary to get the class loader that loaded the patch
     // to load the extension from the resources.
@@ -421,8 +398,11 @@ class BytecodePatchBuilder internal constructor(
      */
     @Suppress("NOTHING_TO_INLINE")
     inline fun extendWith(extension: String) = apply {
-        this.extension = object {}.javaClass.classLoader.getResourceAsStream(extension)
-            ?: throw PatchException("Extension \"$extension\" not found")
+        val classLoader = object {}.javaClass.classLoader
+
+        extensionInputStream = Supplier {
+            classLoader.getResourceAsStream(extension) ?: throw PatchException("Extension \"$extension\" not found")
+        }
     }
 
     override fun build() = BytecodePatch(
@@ -432,8 +412,7 @@ class BytecodePatchBuilder internal constructor(
         compatiblePackages,
         dependencies,
         options,
-        fingerprints,
-        extension,
+        extensionInputStream,
         executionBlock,
         finalizeBlock,
     )

src/main/kotlin/app/revanced/patcher/patch/ResourcePatchContext.kt

@@ -32,14 +32,19 @@ class ResourcePatchContext internal constructor(
     private val logger = Logger.getLogger(ResourcePatchContext::class.java.name)
 
     /**
-     * Read and write documents in the [PatcherConfig.apkFiles].
+     * Read a document from an [InputStream].
      */
-    val document = DocumentOperatable()
+    fun document(inputStream: InputStream) = Document(inputStream)
 
     /**
-     * Predicate to delete resources from [PatcherConfig.apkFiles].
+     * Read and write documents in the [PatcherConfig.apkFiles].
      */
-    private val deleteResources = mutableSetOf<(String) -> Boolean>()
+    fun document(path: String) = Document(get(path))
+
+    /**
+     * Set of resources from [PatcherConfig.apkFiles] to delete.
+     */
+    private val deleteResources = mutableSetOf<String>()
 
     /**
      * Decode resources of [PatcherConfig.apkFile].
@@ -201,11 +206,11 @@ class ResourcePatchContext internal constructor(
     }
 
     /**
-     * Stage a file to be deleted from [PatcherConfig.apkFile].
+     * Mark a file for deletion when the APK is rebuilt.
      *
-     * @param shouldDelete The predicate to stage the file for deletion given its name.
+     * @param name The name of the file to delete.
      */
-    fun stageDelete(shouldDelete: (String) -> Boolean) = deleteResources.add(shouldDelete)
+    fun delete(name: String) = deleteResources.add(name)
 
     /**
      * How to handle resources decoding and compiling.
@@ -227,10 +232,4 @@ class ResourcePatchContext internal constructor(
          */
         NONE,
     }
-
-    inner class DocumentOperatable {
-        operator fun get(inputStream: InputStream) = Document(inputStream)
-
-        operator fun get(path: String) = Document(this@ResourcePatchContext[path])
-    }
 }

src/main/kotlin/app/revanced/patcher/util/MethodNavigator.kt

@@ -12,6 +12,7 @@ import com.android.tools.smali.dexlib2.iface.instruction.Instruction
 import com.android.tools.smali.dexlib2.iface.instruction.ReferenceInstruction
 import com.android.tools.smali.dexlib2.iface.reference.MethodReference
 import com.android.tools.smali.dexlib2.util.MethodUtil
+import kotlin.reflect.KProperty
 
 /**
  * A navigator for methods.
@@ -27,7 +28,7 @@ import com.android.tools.smali.dexlib2.util.MethodUtil
 class MethodNavigator internal constructor(private val context: BytecodePatchContext, private var startMethod: MethodReference) {
     private var lastNavigatedMethodReference = startMethod
 
-    private val lastNavigatedMethodInstructions get() = with(immutable()) {
+    private val lastNavigatedMethodInstructions get() = with(original()) {
         instructionsOrNull ?: throw NavigateException("Method $definingClass.$name does not have an implementation.")
     }
 
@@ -76,15 +77,22 @@ class MethodNavigator internal constructor(private val context: BytecodePatchCon
      *
      * @return The last navigated method mutably.
      */
-    fun mutable() = context.classBy(matchesCurrentMethodReferenceDefiningClass)!!.mutableClass.firstMethodBySignature
+    fun stop() = context.classBy(matchesCurrentMethodReferenceDefiningClass)!!.mutableClass.firstMethodBySignature
         as MutableMethod
 
+    /**
+     * Get the last navigated method mutably.
+     *
+     * @return The last navigated method mutably.
+     */
+    operator fun getValue(nothing: Nothing?, property: KProperty<*>) = stop()
+
     /**
      * Get the last navigated method immutably.
      *
      * @return The last navigated method immutably.
      */
-    fun immutable() = context.classes.first(matchesCurrentMethodReferenceDefiningClass).firstMethodBySignature
+    fun original() = context.classes.first(matchesCurrentMethodReferenceDefiningClass).firstMethodBySignature
 
     /**
      * Predicate to match the class defining the current method reference.

src/test/kotlin/app/revanced/patcher/PatcherTest.kt

@@ -3,21 +3,21 @@ package app.revanced.patcher
 import app.revanced.patcher.patch.*
 import app.revanced.patcher.patch.BytecodePatchContext.LookupMaps
 import app.revanced.patcher.util.ProxyClassList
+import com.android.tools.smali.dexlib2.iface.ClassDef
+import com.android.tools.smali.dexlib2.iface.Method
 import com.android.tools.smali.dexlib2.immutable.ImmutableClassDef
 import com.android.tools.smali.dexlib2.immutable.ImmutableMethod
 import io.mockk.every
 import io.mockk.just
 import io.mockk.mockk
 import io.mockk.runs
+import jdk.internal.module.ModuleBootstrap.patcher
 import kotlinx.coroutines.flow.toList
 import kotlinx.coroutines.runBlocking
 import org.junit.jupiter.api.BeforeEach
-import org.junit.jupiter.api.assertDoesNotThrow
+import org.junit.jupiter.api.assertAll
 import java.util.logging.Logger
-import kotlin.test.Test
-import kotlin.test.assertEquals
-import kotlin.test.assertNull
-import kotlin.test.assertTrue
+import kotlin.test.*
 
 internal object PatcherTest {
     private lateinit var patcher: Patcher
@@ -151,19 +151,15 @@ internal object PatcherTest {
     @Test
     fun `throws if unmatched fingerprint match is delegated`() {
         val patch = bytecodePatch {
-            // Fingerprint can never match.
-            val match by fingerprint { }
-            // Manually add the fingerprint.
-            app.revanced.patcher.fingerprint { }()
-
             execute {
+                // Fingerprint can never match.
+                val match by fingerprint { }
+
                 // Throws, because the fingerprint can't be matched.
                 match.patternMatch
             }
         }
 
-        assertEquals(2, patch.fingerprints.size)
-
         assertTrue(
             patch().exception != null,
             "Expected an exception because the fingerprint can't match.",
@@ -172,44 +168,6 @@ internal object PatcherTest {
 
     @Test
     fun `matches fingerprint`() {
-        mockClassWithMethod()
-
-        val patches = setOf(bytecodePatch { fingerprint { this returns "V" } })
-
-        assertNull(
-            patches.first().fingerprints.first().match,
-            "Expected fingerprint to be matched before execution.",
-        )
-
-        patches()
-
-        assertDoesNotThrow("Expected fingerprint to be matched.") {
-            assertEquals(
-                "V",
-                patches.first().fingerprints.first().match!!.method.returnType,
-                "Expected fingerprint to be matched.",
-            )
-        }
-    }
-
-    private operator fun Set<Patch<*>>.invoke(): List<PatchResult> {
-        every { patcher.context.executablePatches } returns toMutableSet()
-        every { patcher.context.bytecodeContext.lookupMaps } returns LookupMaps(patcher.context.bytecodeContext.classes)
-        every { with(patcher.context.bytecodeContext) { any<Set<Patch<*>>>().mergeExtensions() } } just runs
-
-        return runBlocking { patcher().toList() }
-    }
-
-    private operator fun Patch<*>.invoke() = setOf(this)().first()
-
-    private fun Any.setPrivateField(field: String, value: Any) {
-        this::class.java.getDeclaredField(field).apply {
-            this.isAccessible = true
-            set(this@setPrivateField, value)
-        }
-    }
-
-    private fun mockClassWithMethod() {
         every { patcher.context.bytecodeContext.classes } returns ProxyClassList(
             mutableListOf(
                 ImmutableClassDef(
@@ -235,6 +193,50 @@ internal object PatcherTest {
                 ),
             ),
         )
+        every { with(patcher.context.bytecodeContext) { any<Fingerprint>().match } } answers { callOriginal() }
+        every { with(patcher.context.bytecodeContext) { any<Fingerprint>().match(any<ClassDef>()) } } answers { callOriginal() }
+        every { with(patcher.context.bytecodeContext) { any<Fingerprint>().match(any<Method>()) } } answers { callOriginal() }
+        every { patcher.context.bytecodeContext.classBy(any()) } answers { callOriginal() }
+        every { patcher.context.bytecodeContext.proxy(any()) } answers { callOriginal() }
+
+        val fingerprint = fingerprint { returns("V") }
+        val fingerprint2 = fingerprint { returns("V") }
+        val fingerprint3 = fingerprint { returns("V") }
+
+        val patches = setOf(
+            bytecodePatch {
+                execute {
+                    fingerprint.match(classes.first().methods.first())
+                    fingerprint2.match(classes.first())
+                    fingerprint3.match
+                }
+            },
+        )
+
+        patches()
+
+        assertAll(
+            "Expected fingerprints to match.",
+            { assertNotNull(fingerprint._match) },
+            { assertNotNull(fingerprint2._match) },
+            { assertNotNull(fingerprint3._match) },
+        )
+    }
+
+    private operator fun Set<Patch<*>>.invoke(): List<PatchResult> {
+        every { patcher.context.executablePatches } returns toMutableSet()
         every { patcher.context.bytecodeContext.lookupMaps } returns LookupMaps(patcher.context.bytecodeContext.classes)
+        every { with(patcher.context.bytecodeContext) { mergeExtension(any<BytecodePatch>()) } } just runs
+
+        return runBlocking { patcher().toList() }
+    }
+
+    private operator fun Patch<*>.invoke() = setOf(this)().first()
+
+    private fun Any.setPrivateField(field: String, value: Any) {
+        this::class.java.getDeclaredField(field).apply {
+            this.isAccessible = true
+            set(this@setPrivateField, value)
+        }
     }
 }

src/test/kotlin/app/revanced/patcher/patch/PatchTest.kt

@@ -1,6 +1,5 @@
 package app.revanced.patcher.patch
 
-import app.revanced.patcher.fingerprint
 import kotlin.test.Test
 import kotlin.test.assertEquals
 
@@ -24,23 +23,6 @@ internal object PatchTest {
         assertEquals("compatible.package", patch.compatiblePackages!!.first().first)
     }
 
-    @Test
-    fun `can create patch with fingerprints`() {
-        val externalFingerprint = fingerprint {}
-
-        val patch = bytecodePatch(name = "Test") {
-            val externalFingerprintMatch by externalFingerprint()
-            val internalFingerprintMatch by fingerprint {}
-
-            execute {
-                externalFingerprintMatch.method
-                internalFingerprintMatch.method
-            }
-        }
-
-        assertEquals(2, patch.fingerprints.size)
-    }
-
     @Test
     fun `can create patch with dependencies`() {
         val patch = bytecodePatch(name = "Test") {