feat: Composition API

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

@@ -48,7 +48,6 @@ class Fingerprint internal constructor(
     internal val strings: List<String>?,
     internal val custom: ((method: Method, classDef: ClassDef) -> Boolean)?,
 ) {
-    @Suppress("ktlint:standard:backing-property-naming")
     // Backing field needed for lazy initialization.
     private var _matchOrNull: Match? = null
 
@@ -117,7 +116,7 @@ class Fingerprint internal constructor(
             } else null
 
             currentMethod = this
-            return filters == null || matchIndices(instructionsOrNull ?: return false, "match") {
+            return filters == null || matchIndices(instructionsOrNull ?: return false) {
                 filters.forEach { filter ->
                     val filterMatches: Instruction.() -> Boolean = { filter.matches(currentMethod, this) }
 
@@ -264,7 +263,7 @@ class Fingerprint internal constructor(
 
             } else null
 
-            return filters == null || matchIndices.apply {
+            return filters == null || matchIndices(instructionsOrNull ?: return false) {
                 filters.forEach { filter ->
                     val filterMatches: Instruction.() -> Boolean = { filter.matches(method, this) }
 
@@ -277,7 +276,7 @@ class Fingerprint internal constructor(
                         is MatchFirst -> head { filterMatches() }
                     }
                 }
-            }(instructionsOrNull ?: return false)
+            }
         }
 
         if (!context(MatchContext()) { method.match() }) return null

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

@@ -4,8 +4,12 @@ package app.revanced.patcher
 
 import app.revanced.patcher.Matcher.MatchContext
 import app.revanced.patcher.dex.mutable.MutableMethod
+import app.revanced.patcher.extensions.accessFlags
 import app.revanced.patcher.patch.BytecodePatchContext
+import app.revanced.patcher.patch.gettingBytecodePatch
+import com.android.tools.smali.dexlib2.AccessFlags
 import com.android.tools.smali.dexlib2.HiddenApiRestriction
+import com.android.tools.smali.dexlib2.Opcode
 import com.android.tools.smali.dexlib2.iface.*
 import com.android.tools.smali.dexlib2.iface.Annotation
 import com.android.tools.smali.dexlib2.iface.instruction.Instruction
@@ -217,7 +221,6 @@ fun gettingFirstMethodMutable(
 
 fun <T> indexedMatcher() = IndexedMatcher<T>()
 
-// Add lambda to emit instructions if matched (or matched arg)
 fun <T> indexedMatcher(build: IndexedMatcher<T>.() -> Unit) =
     IndexedMatcher<T>().apply(build)
 
@@ -234,7 +237,7 @@ operator fun <T> IndexedMatcher<T>.invoke(key: Any, iterable: Iterable<T>, build
 
 context(_: MatchContext)
 operator fun <T> IndexedMatcher<T>.invoke(iterable: Iterable<T>, builder: IndexedMatcher<T>.() -> Unit) =
-    invoke(hashCode(), iterable, builder)
+    invoke(this@invoke.hashCode(), iterable, builder)
 
 abstract class Matcher<T, U> : MutableList<U> by mutableListOf() {
     var matchIndex = -1
@@ -357,3 +360,245 @@ class IndexedMatcher<T>() : Matcher<T, T.(lastMatchedIndex: Int, currentIndex: I
 
     fun add(predicate: T.() -> Boolean) = add { _, _ -> predicate() }
 }
+
+class DeclarativePredicateBuilder<T> {
+    private val children = mutableListOf<T.() -> Boolean>()
+
+    fun anyOf(block: DeclarativePredicateBuilder<T>.() -> Unit) {
+        val child = DeclarativePredicateBuilder<T>().apply(block)
+        children += { child.children.any { it() } }
+    }
+
+    fun predicate(block: T.() -> Boolean) {
+        children += block
+    }
+
+    fun all(target: T): Boolean = children.all { target.it() }
+    fun any(target: T): Boolean = children.all { target.it() }
+}
+
+fun <T> T.declarativePredicate(build: DeclarativePredicateBuilder<T>.() -> Unit) =
+    DeclarativePredicateBuilder<T>().apply(build).all(this)
+
+context(_: MatchContext)
+fun <T> T.rememberDeclarativePredicate(key: Any, block: DeclarativePredicateBuilder<T>.() -> Unit): Boolean =
+    remember(key) { DeclarativePredicateBuilder<T>().apply(block) }.all(this)
+
+context(_: MatchContext)
+private fun <T> T.rememberDeclarativePredicate(predicate: context(MatchContext, T) DeclarativePredicateBuilder<T>.() -> Unit) =
+    rememberDeclarativePredicate("declarative predicate build") { predicate() }
+
+fun BytecodePatchContext.firstClassDefByDeclarativePredicateOrNull(
+    predicate: context(MatchContext, ClassDef) DeclarativePredicateBuilder<ClassDef>.() -> Unit
+) = firstClassDefOrNull { rememberDeclarativePredicate(predicate) }
+
+fun BytecodePatchContext.firstClassDefByDeclarativePredicate(
+    predicate: context(MatchContext, ClassDef) DeclarativePredicateBuilder<ClassDef>.() -> Unit
+) = requireNotNull(firstClassDefByDeclarativePredicateOrNull(predicate))
+
+fun BytecodePatchContext.firstClassDefMutableByDeclarativePredicateOrNull(
+    predicate: context(MatchContext, ClassDef) DeclarativePredicateBuilder<ClassDef>.() -> Unit
+) = firstClassDefMutableOrNull { rememberDeclarativePredicate(predicate) }
+
+fun BytecodePatchContext.firstClassDefMutableByDeclarativePredicate(
+    predicate: context(MatchContext, ClassDef) DeclarativePredicateBuilder<ClassDef>.() -> Unit
+) = requireNotNull(firstClassDefMutableByDeclarativePredicateOrNull(predicate))
+
+fun BytecodePatchContext.firstClassDefByDeclarativePredicateOrNull(
+    type: String,
+    predicate: context(MatchContext, ClassDef) DeclarativePredicateBuilder<ClassDef>.() -> Unit
+) = firstClassDefOrNull(type) { rememberDeclarativePredicate(predicate) }
+
+fun BytecodePatchContext.firstClassDefByDeclarativePredicate(
+    type: String,
+    predicate: context(MatchContext, ClassDef) DeclarativePredicateBuilder<ClassDef>.() -> Unit
+) = requireNotNull(firstClassDefByDeclarativePredicateOrNull(type, predicate))
+
+fun BytecodePatchContext.firstClassDefMutableByDeclarativePredicateOrNull(
+    type: String,
+    predicate: context(MatchContext, ClassDef) DeclarativePredicateBuilder<ClassDef>.() -> Unit
+) = firstClassDefMutableOrNull(type) { rememberDeclarativePredicate(predicate) }
+
+fun BytecodePatchContext.firstClassDefMutableByDeclarativePredicate(
+    type: String,
+    predicate: context(MatchContext, ClassDef) DeclarativePredicateBuilder<ClassDef>.() -> Unit
+) = requireNotNull(firstClassDefMutableByDeclarativePredicateOrNull(type, predicate))
+
+fun BytecodePatchContext.firstMethodByDeclarativePredicateOrNull(
+    vararg strings: String,
+    predicate: context(MatchContext, Method) DeclarativePredicateBuilder<Method>.() -> Unit
+) = firstMethodOrNull(*strings) { rememberDeclarativePredicate(predicate) }
+
+fun BytecodePatchContext.firstMethodByDeclarativePredicate(
+    vararg strings: String,
+    predicate: context(MatchContext, Method) DeclarativePredicateBuilder<Method>.() -> Unit
+) = requireNotNull(firstMethodByDeclarativePredicateOrNull(*strings, predicate = predicate))
+
+fun BytecodePatchContext.firstMethodMutableByDeclarativePredicateOrNull(
+    vararg strings: String,
+    predicate: context(MatchContext, Method) DeclarativePredicateBuilder<Method>.() -> Unit
+) = firstMethodMutableOrNull(*strings) { rememberDeclarativePredicate(predicate) }
+
+fun BytecodePatchContext.firstMethodMutableByDeclarativePredicate(
+    vararg strings: String,
+    predicate: context(MatchContext, Method) DeclarativePredicateBuilder<Method>.() -> Unit
+) = requireNotNull(firstMethodMutableByDeclarativePredicateOrNull(*strings, predicate = predicate))
+
+fun gettingFirstClassDefByDeclarativePredicateOrNull(
+    type: String,
+    predicate: context(MatchContext, ClassDef) DeclarativePredicateBuilder<ClassDef>.() -> Unit
+) = gettingFirstClassDefOrNull(type) { rememberDeclarativePredicate(predicate) }
+
+fun gettingFirstClassDefByDeclarativePredicate(
+    type: String,
+    predicate: context(MatchContext, ClassDef) DeclarativePredicateBuilder<ClassDef>.() -> Unit
+) = requireNotNull(gettingFirstClassDefByDeclarativePredicateOrNull(type, predicate))
+
+fun gettingFirstClassDefMutableByDeclarativePredicateOrNull(
+    type: String,
+    predicate: context(MatchContext, ClassDef) DeclarativePredicateBuilder<ClassDef>.() -> Unit
+) = gettingFirstClassDefMutableOrNull(type) { rememberDeclarativePredicate(predicate) }
+
+fun gettingFirstClassDefMutableByDeclarativePredicate(
+    type: String,
+    predicate: context(MatchContext, ClassDef) DeclarativePredicateBuilder<ClassDef>.() -> Unit
+) = requireNotNull(gettingFirstClassDefMutableByDeclarativePredicateOrNull(type, predicate))
+
+fun gettingFirstClassDefByDeclarativePredicateOrNull(
+    predicate: context(MatchContext, ClassDef) DeclarativePredicateBuilder<ClassDef>.() -> Unit
+) = gettingFirstClassDefOrNull { rememberDeclarativePredicate(predicate) }
+
+fun gettingFirstClassDefByDeclarativePredicate(
+    predicate: context(MatchContext, ClassDef) DeclarativePredicateBuilder<ClassDef>.() -> Unit
+) = requireNotNull(gettingFirstClassDefByDeclarativePredicateOrNull(predicate))
+
+fun gettingFirstClassDefMutableByDeclarativePredicateOrNull(
+    predicate: context(MatchContext, ClassDef) DeclarativePredicateBuilder<ClassDef>.() -> Unit
+) = gettingFirstClassDefMutableOrNull { rememberDeclarativePredicate(predicate) }
+
+fun gettingFirstClassDefMutableByDeclarativePredicate(
+    predicate: context(MatchContext, ClassDef) DeclarativePredicateBuilder<ClassDef>.() -> Unit
+) = requireNotNull(gettingFirstClassDefMutableByDeclarativePredicateOrNull(predicate))
+
+fun gettingFirstMethodByDeclarativePredicateOrNull(
+    predicate: context(MatchContext, Method) DeclarativePredicateBuilder<Method>.() -> Unit
+) = gettingFirstMethodOrNull { rememberDeclarativePredicate(predicate) }
+
+fun gettingFirstMethodByDeclarativePredicate(
+    predicate: context(MatchContext, Method) DeclarativePredicateBuilder<Method>.() -> Unit
+) = requireNotNull(gettingFirstMethodByDeclarativePredicateOrNull(predicate))
+
+fun gettingFirstMethodMutableByDeclarativePredicateOrNull(
+    predicate: context(MatchContext, Method) DeclarativePredicateBuilder<Method>.() -> Unit
+) = gettingFirstMethodMutableOrNull { rememberDeclarativePredicate(predicate) }
+
+fun gettingFirstMethodMutableByDeclarativePredicate(
+    predicate: context(MatchContext, Method) DeclarativePredicateBuilder<Method>.() -> Unit
+) = requireNotNull(gettingFirstMethodMutableByDeclarativePredicateOrNull(predicate))
+
+fun gettingFirstMethodByDeclarativePredicateOrNull(
+    vararg strings: String,
+    predicate: context(MatchContext, Method) DeclarativePredicateBuilder<Method>.() -> Unit
+) = gettingFirstMethodOrNull(*strings) { rememberDeclarativePredicate(predicate) }
+
+fun gettingFirstMethodByDeclarativePredicate(
+    vararg strings: String,
+    predicate: context(MatchContext, Method) DeclarativePredicateBuilder<Method>.() -> Unit
+) = requireNotNull(gettingFirstMethodByDeclarativePredicateOrNull(*strings, predicate = predicate))
+
+fun gettingFirstMethodMutableByDeclarativePredicateOrNull(
+    vararg strings: String,
+    predicate: context(MatchContext, Method) DeclarativePredicateBuilder<Method>.() -> Unit
+) = gettingFirstMethodMutableOrNull(*strings) { rememberDeclarativePredicate(predicate) }
+
+fun gettingFirstMethodMutableByDeclarativePredicate(
+    vararg strings: String,
+    predicate: context(MatchContext, Method) DeclarativePredicateBuilder<Method>.() -> Unit
+) = requireNotNull(gettingFirstMethodMutableByDeclarativePredicateOrNull(*strings, predicate = predicate))
+
+
+class CompositionBuilder() {
+    val indexedMatcher = IndexedMatcher<Instruction>()
+
+    var accessFlagsPredicate: (DeclarativePredicateBuilder<Method>.() -> Unit)? = null
+    var returnsPredicate: (DeclarativePredicateBuilder<Method>.() -> Unit)? = null
+    var parameterTypesPredicate: (DeclarativePredicateBuilder<Method>.() -> Unit)? = null
+    var instructionsPredicate: (context(MatchContext) DeclarativePredicateBuilder<Method>.() -> Unit)? = null
+    var customPredicate: (context(MatchContext) DeclarativePredicateBuilder<Method>.() -> Unit)? = null
+
+    fun accessFlags(vararg flags: AccessFlags) {
+        accessFlagsPredicate = { predicate { accessFlags(*flags) } }
+    }
+
+    fun returns(returnType: String) {
+        returnsPredicate = { predicate { this.returnType.startsWith(returnType) } }
+    }
+
+    fun parameterTypes(vararg parameterTypes: String) {
+        parameterTypesPredicate = {
+            predicate {
+                this.parameterTypes.size == parameterTypes.size && this.parameterTypes.zip(parameterTypes)
+                    .all { (a, b) -> a.startsWith(b) }
+            }
+        }
+    }
+
+    fun instructions(build: context(MatchContext, Method) IndexedMatcher<Instruction>.() -> Unit) {
+        instructionsPredicate = {
+            predicate {
+                implementation { indexedMatcher(this@CompositionBuilder.hashCode(), instructions) { build() } }
+            }
+        }
+    }
+
+    fun custom(block: context(MatchContext) Method.() -> Boolean) {
+        customPredicate = { predicate { block() } }
+    }
+
+
+    fun build() = Composition(indexedMatcher) {
+        accessFlagsPredicate?.invoke(this)
+        returnsPredicate?.invoke(this)
+        parameterTypesPredicate?.invoke(this)
+        with(contextOf<MatchContext>()) {
+            instructionsPredicate?.invoke(this@with, this@Composition)
+            customPredicate?.invoke(this@with, this@Composition)
+        }
+    }
+}
+
+class Composition internal constructor(
+    private val indexedMatcher: IndexedMatcher<Instruction>,
+    predicate: context(MatchContext, Method) DeclarativePredicateBuilder<Method>.() -> Unit
+) {
+    val methodOrNull by gettingFirstMethodMutableByDeclarativePredicateOrNull(predicate)
+    val method = requireNotNull(methodOrNull)
+    val indices get() = indexedMatcher.indices
+}
+
+fun composeFirstMethod(predicate: CompositionBuilder.() -> Unit) = CompositionBuilder().apply(predicate).build()
+
+val methodComposition = composeFirstMethod {
+    accessFlags(AccessFlags.PUBLIC)
+    instructions {
+        head { opcode == Opcode.RETURN }
+        fun opcode(opcode: Opcode) = add { this.opcode == opcode }
+        opcode(Opcode.NOP)
+    }
+}
+
+val patch by gettingBytecodePatch {
+    execute {
+        val mutableMethod = methodComposition.method
+        methodComposition.indices.first() // Opcode == return
+
+        firstClassDef(mutableMethod.definingClass).methods
+        firstClassDefMutable { type == mutableMethod.definingClass }
+        firstClassDefByDeclarativePredicateOrNull {
+            anyOf {
+                predicate { type == mutableMethod.definingClass }
+                predicate { type == "Ltest;" }
+            }
+        }
+    }
+}

src/main/kotlin/app/revanced/patcher/extensions/Instruction.kt

@@ -1,12 +1,24 @@
 package app.revanced.patcher.extensions
 
+import app.revanced.patcher.dex.mutable.MutableMethod
+import com.android.tools.smali.dexlib2.AccessFlags
 import com.android.tools.smali.dexlib2.Opcode
+import com.android.tools.smali.dexlib2.Opcodes
+import com.android.tools.smali.dexlib2.builder.BuilderInstruction
 import com.android.tools.smali.dexlib2.iface.instruction.DualReferenceInstruction
 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.instruction.WideLiteralInstruction
 import com.android.tools.smali.dexlib2.iface.reference.*
 import com.android.tools.smali.dexlib2.util.MethodUtil
+import com.android.tools.smali.dexlib2.writer.builder.DexBuilder
+import com.android.tools.smali.smali.smaliFlexLexer
+import com.android.tools.smali.smali.smaliParser
+import com.android.tools.smali.smali.smaliTreeWalker
+import org.antlr.runtime.CommonTokenStream
+import org.antlr.runtime.TokenSource
+import org.antlr.runtime.tree.CommonTreeNodeStream
+import java.io.StringReader
 
 inline fun <reified T : Reference> Instruction.reference(predicate: T.() -> Boolean) =
     ((this as? ReferenceInstruction)?.reference as? T)?.predicate() ?: false
@@ -48,17 +60,72 @@ private inline fun <reified T : Reference> Instruction.reference(): T? =
 val Instruction.reference: Reference?
     get() = reference()
 
-val Instruction.methodReference get() =
+val Instruction.methodReference
+    get() =
         reference<MethodReference>()
 
-val Instruction.fieldReference get() =
+val Instruction.fieldReference
+    get() =
         reference<FieldReference>()
 
-val Instruction.typeReference get() =
+val Instruction.typeReference
+    get() =
         reference<TypeReference>()
 
-val Instruction.stringReference get() =
+val Instruction.stringReference
+    get() =
         reference<StringReference>()
 
-val Instruction.wideLiteral get() =
+val Instruction.wideLiteral
+    get() =
         (this as? WideLiteralInstruction)?.wideLiteral
+
+
+private const val CLASS_HEADER = ".class LInlineCompiler;\n.super Ljava/lang/Object;\n"
+private const val STATIC_HEADER = "$CLASS_HEADER.method public static dummyMethod("
+private const val HEADER = "$CLASS_HEADER.method public dummyMethod("
+private val sb by lazy { StringBuilder(512) }
+
+/**
+ * Compile lines of Smali code to a list of instructions.
+ *
+ * Note: Adding compiled instructions to an existing method with
+ * offset instructions WITHOUT specifying a parent method will not work.
+ * @param templateMethod The method to compile the instructions against.
+ * @returns A list of instructions.
+ */
+fun String.toInstructions(templateMethod: MutableMethod? = null): List<BuilderInstruction> {
+    val parameters = templateMethod?.parameterTypes?.joinToString("") { it } ?: ""
+    val registers = templateMethod?.implementation?.registerCount ?: 1 // TODO: Should this be 0?
+    val isStatic = templateMethod?.let { AccessFlags.STATIC.isSet(it.accessFlags) } ?: true
+
+    sb.setLength(0) // reset
+
+    if (isStatic) sb.append(STATIC_HEADER) else sb.append(HEADER)
+    sb.append(parameters).append(")V\n")
+    sb.append("    .registers ").append(registers).append("\n")
+    sb.append(trimIndent()).append("\n")
+    sb.append(".end method")
+
+    val reader = StringReader(sb.toString())
+    val lexer = smaliFlexLexer(reader, 15)
+    val tokens = CommonTokenStream(lexer as TokenSource)
+    val parser = smaliParser(tokens)
+    val fileTree = parser.smali_file()
+
+    if (lexer.numberOfSyntaxErrors > 0 || parser.numberOfSyntaxErrors > 0) {
+        throw IllegalStateException(
+            "Lexer errors: ${lexer.numberOfSyntaxErrors}, Parser errors: ${parser.numberOfSyntaxErrors}"
+        )
+    }
+
+    val treeStream = CommonTreeNodeStream(fileTree.tree).apply {
+        tokenStream = tokens
+    }
+
+    val walker = smaliTreeWalker(treeStream)
+    walker.setDexBuilder(DexBuilder(Opcodes.getDefault()))
+
+    val classDef = walker.smali_file()
+    return classDef.methods.first().instructions.map { it as BuilderInstruction }
+}

src/main/kotlin/app/revanced/patcher/extensions/Method.kt

@@ -1,7 +1,6 @@
 package app.revanced.patcher.extensions
 
 import app.revanced.patcher.dex.mutable.MutableMethod
-import app.revanced.patcher.util.toInstructions
 import com.android.tools.smali.dexlib2.AccessFlags
 import com.android.tools.smali.dexlib2.builder.BuilderInstruction
 import com.android.tools.smali.dexlib2.builder.BuilderOffsetInstruction

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

@@ -21,6 +21,13 @@ typealias PackageName = String
 typealias VersionName = String
 typealias Package = Pair<PackageName, Set<VersionName>?>
 
+
+/**
+ * A common interface for contexts such as [ResourcePatchContext] and [BytecodePatchContext].
+ */
+
+sealed interface PatchContext<T> : Supplier<T>
+
 /**
  * A patch.
  *

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

@@ -1,9 +0,0 @@
-package app.revanced.patcher.patch
-
-import java.util.function.Supplier
-
-/**
- * A common interface for contexts such as [ResourcePatchContext] and [BytecodePatchContext].
- */
-
-sealed interface PatchContext<T> : Supplier<T>

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

@@ -1,64 +0,0 @@
-package app.revanced.patcher.util
-
-import app.revanced.patcher.dex.mutable.MutableMethod
-import app.revanced.patcher.extensions.instructions
-import com.android.tools.smali.dexlib2.AccessFlags
-import com.android.tools.smali.dexlib2.Opcodes
-import com.android.tools.smali.dexlib2.builder.BuilderInstruction
-import com.android.tools.smali.dexlib2.writer.builder.DexBuilder
-import com.android.tools.smali.smali.smaliFlexLexer
-import com.android.tools.smali.smali.smaliParser
-import com.android.tools.smali.smali.smaliTreeWalker
-import org.antlr.runtime.CommonTokenStream
-import org.antlr.runtime.TokenSource
-import org.antlr.runtime.tree.CommonTreeNodeStream
-import java.io.StringReader
-
-private const val CLASS_HEADER = ".class LInlineCompiler;\n.super Ljava/lang/Object;\n"
-private const val STATIC_HEADER = "$CLASS_HEADER.method public static dummyMethod("
-private const val HEADER = "$CLASS_HEADER.method public dummyMethod("
-private val sb by lazy { StringBuilder(512) }
-
-/**
- * Compile lines of Smali code to a list of instructions.
- *
- * Note: Adding compiled instructions to an existing method with
- * offset instructions WITHOUT specifying a parent method will not work.
- * @param templateMethod The method to compile the instructions against.
- * @returns A list of instructions.
- */
-fun String.toInstructions(templateMethod: MutableMethod? = null): List<BuilderInstruction> {
-    val parameters = templateMethod?.parameterTypes?.joinToString("") { it } ?: ""
-    val registers = templateMethod?.implementation?.registerCount ?: 1 // TODO: Should this be 0?
-    val isStatic = templateMethod?.let { AccessFlags.STATIC.isSet(it.accessFlags) } ?: true
-
-    sb.setLength(0) // reset
-
-    if (isStatic) sb.append(STATIC_HEADER) else sb.append(HEADER)
-    sb.append(parameters).append(")V\n")
-    sb.append("    .registers ").append(registers).append("\n")
-    sb.append(trimIndent()).append("\n")
-    sb.append(".end method")
-
-    val reader = StringReader(sb.toString())
-    val lexer = smaliFlexLexer(reader, 15)
-    val tokens = CommonTokenStream(lexer as TokenSource)
-    val parser = smaliParser(tokens)
-    val fileTree = parser.smali_file()
-
-    if (lexer.numberOfSyntaxErrors > 0 || parser.numberOfSyntaxErrors > 0) {
-        throw IllegalStateException(
-            "Lexer errors: ${lexer.numberOfSyntaxErrors}, Parser errors: ${parser.numberOfSyntaxErrors}"
-        )
-    }
-
-    val treeStream = CommonTreeNodeStream(fileTree.tree).apply {
-        tokenStream = tokens
-    }
-
-    val walker = smaliTreeWalker(treeStream)
-    walker.setDexBuilder(DexBuilder(Opcodes.getDefault()))
-
-    val classDef = walker.smali_file()
-    return classDef.methods.first().instructions.map { it as BuilderInstruction }
-}

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

@@ -1,7 +1,7 @@
 package app.revanced.patcher
 
+import app.revanced.patcher.extensions.toInstructions
 import app.revanced.patcher.patch.*
-import app.revanced.patcher.util.toInstructions
 import com.android.tools.smali.dexlib2.Opcode
 import com.android.tools.smali.dexlib2.iface.instruction.Instruction
 import com.android.tools.smali.dexlib2.immutable.ImmutableClassDef
@@ -298,7 +298,7 @@ internal object PatcherTest {
         val matchIndices = indexedMatcher<Instruction>()
         val method by gettingFirstMethod {
             implementation {
-                matchIndices(instructions, "match") {
+                matchIndices(instructions) {
                     head { opcode == Opcode.CONST_STRING }
                     add { opcode == Opcode.IPUT_OBJECT }
                 }