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feat: decompiler wip
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‎NOTICE

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@@ -16,6 +16,14 @@ https://www.jetbrains.com/idea/
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---
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JetBrains Java Decompiler FernFlower v243.22562.218
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Licensed under the Apache License, Version 2.0
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Copyright © 2014–2025 JetBrains s.r.o.
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https://www.jetbrains.com/
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---
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Kotlin Compiler & Analysis API v2.2.20-dev-2432
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Licensed under the Apache License, Version 2.0
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Modules used: kotlin-compiler, analysis-api-k2-for-ide, analysis-api-for-ide, low-level-api-fir-for-ide, analysis-api-platform-interface-for-ide, symbol-light-classes-for-ide, analysis-api-impl-base-for-ide, kotlin-compiler-common-for-ide, kotlin-compiler-fir-for-ide

‎app/build.gradle.kts

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@@ -28,6 +28,7 @@ dependencies {
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implementation("com.jetbrains.intellij.platform:core:$intellijVersion")
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implementation("com.jetbrains.intellij.platform:core-impl:$intellijVersion")
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implementation("com.jetbrains.intellij.platform:util:$intellijVersion")
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implementation("com.jetbrains.intellij.java:java-decompiler-engine:243.22562.218")
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val analysisApiKotlinVersion = "2.2.20-dev-2432" // 13-May-2025 (version that KSP uses)
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implementation("org.jetbrains.kotlin:kotlin-compiler:$analysisApiKotlinVersion")

‎app/src/main/kotlin/org/kotlinlsp/actions/GoToDefinition.kt

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package org.kotlinlsp.actions
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3-
import com.intellij.openapi.project.DefaultProjectFactory
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import com.intellij.psi.JavaPsiFacade
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import com.intellij.psi.PsiFile
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import com.intellij.psi.PsiManager
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import com.intellij.psi.impl.compiled.ClassFileDecompiler
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import org.eclipse.lsp4j.Location
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import org.eclipse.lsp4j.Position
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import org.eclipse.lsp4j.Range
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import org.jetbrains.java.decompiler.main.decompiler.ConsoleDecompiler
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import org.jetbrains.kotlin.analysis.api.KaSession
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import org.jetbrains.kotlin.analysis.api.analyze
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import org.jetbrains.kotlin.analysis.api.platform.packages.KotlinPackagePartProviderFactory
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import org.jetbrains.kotlin.analysis.api.symbols.KaCallableSymbol
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import org.jetbrains.kotlin.analysis.decompiler.psi.KotlinClassFileDecompiler
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import org.jetbrains.kotlin.idea.KotlinLanguage
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import org.jetbrains.kotlin.idea.references.mainReference
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import org.jetbrains.kotlin.psi.KtFile
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import org.jetbrains.kotlin.psi.KtReferenceExpression
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import org.kotlinlsp.common.info
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import org.kotlinlsp.common.toLspRange
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import org.kotlinlsp.common.toOffset
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import org.kotlinlsp.common.warn
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import java.io.File
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import java.nio.file.Files
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import java.nio.file.Path
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import java.util.jar.JarFile
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import kotlin.io.path.absolutePathString
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fun goToDefinitionAction(ktFile: KtFile, position: Position): Location? = analyze(ktFile) {
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val offset = position.toOffset(ktFile)
@@ -30,6 +31,7 @@ fun goToDefinitionAction(ktFile: KtFile, position: Position): Location? = analyz
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val file = element.containingFile ?: return null
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if(file.viewProvider.document == null) {
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// This comes from a java .class file
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// TODO Handle the case of JDK .class files (jrt:// urls)
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return tryDecompileJavaClass(file)
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}
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val range = element.textRange.toLspRange(file)
@@ -42,6 +44,7 @@ fun goToDefinitionAction(ktFile: KtFile, position: Position): Location? = analyz
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}
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private fun KaSession.tryResolveFromKotlinLibrary(ktFile: KtFile, offset: Int): Location? {
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// TODO Test class methods, properties and types to see if they work, just tested with top level functions
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val element = ktFile.findElementAt(offset) ?: return null
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val ref = element.parent as? KtReferenceExpression ?: return null
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val symbol = ref.mainReference.resolveToSymbol() as? KaCallableSymbol ?: return null
@@ -69,6 +72,7 @@ private fun KaSession.tryResolveFromKotlinLibrary(ktFile: KtFile, offset: Int):
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val decompiledContent = decompiledView.content.get()
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val tmpFile = File.createTempFile("KtDecompiledFile", ".kt")
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tmpFile.writeText(decompiledContent)
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tmpFile.setWritable(false)
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return Location().apply {
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uri = "file://${tmpFile.absolutePath}"
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}
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private fun tryDecompileJavaClass(file: PsiFile): Location? {
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// Just testing, does not work right now
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/*val decompiledContent = ClassFileDecompiler().decompile(file.virtualFile).toString()
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val tmpFile = File.createTempFile("JavaDecompiledFile", ".java")
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tmpFile.writeText(decompiledContent)
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val classFile = extractClassFromJar("${file.containingDirectory}/${file.containingFile.name}") ?: return null
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val outputDir = Files.createTempDirectory("fernflower_output").toFile()
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try {
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val args = arrayOf(
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"-jpr=1",
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classFile.absolutePath,
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outputDir.absolutePath
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)
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ConsoleDecompiler.main(args)
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return Location().apply {
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uri = "file://${tmpFile.absolutePath}"
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range = Range().apply {
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start = Position(0, 0) // TODO Set correct position
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end = Position(0, 1)
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val outName = classFile.toPath().fileName.replaceExtensionWith(".java")
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val outPath = outputDir.toPath().resolve(outName)
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if (!Files.exists(outPath)) return null
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outPath.toFile().setWritable(false)
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return Location().apply {
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uri = "file://${outPath.absolutePathString()}"
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range = Range().apply {
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start = Position(0, 0) // TODO Set correct position
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end = Position(0, 1)
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}
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}
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}*/
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return null
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} catch (e: Exception) {
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warn(e.message ?: "Unknown fernflower error")
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return null
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} finally {
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classFile.delete()
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}
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}
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private fun extractClassFromJar(jarPathWithEntry: String): File? {
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try {
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val path = jarPathWithEntry.removePrefix("PsiDirectory:")
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val (jarPath, entryPath) = path.split("!/")
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val jarFile = JarFile(jarPath)
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val entry = jarFile.getEntry(entryPath)
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val inputStream = jarFile.getInputStream(entry)
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val tempFile = File.createTempFile("JavaClass", ".class")
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tempFile.outputStream().use { output -> inputStream.copyTo(output) }
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jarFile.close()
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return tempFile
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} catch (e: Exception) {
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warn("Error extracting class from jar: $jarPathWithEntry")
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return null
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}
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}
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private fun Path.replaceExtensionWith(newExtension: String): Path {
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val oldName = fileName.toString()
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val newName = oldName.substring(0, oldName.lastIndexOf(".")) + newExtension
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return resolveSibling(newName)
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}

‎licenses/org.jetbrains.java.decompiler/LICENSE

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‎licenses/org.jetbrains.java.decompiler/NOTICE

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Copyright © 2014–2025 JetBrains s.r.o.
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https://www.jetbrains.com/

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