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// Copyright 2000-2021 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
package org.jetbrains.kotlin.idea.intentions
import com.intellij.codeInsight.intention.LowPriorityAction
import com.intellij.openapi.editor.Editor
import org.jetbrains.kotlin.builtins.isSuspendFunctionType
import org.jetbrains.kotlin.descriptors.FunctionDescriptor
import org.jetbrains.kotlin.descriptors.ValueParameterDescriptor
import org.jetbrains.kotlin.descriptors.impl.AnonymousFunctionDescriptor
import org.jetbrains.kotlin.descriptors.impl.ValueParameterDescriptorImpl
import org.jetbrains.kotlin.idea.KotlinBundle
import org.jetbrains.kotlin.idea.caches.resolve.analyze
import org.jetbrains.kotlin.idea.core.ShortenReferences
import org.jetbrains.kotlin.idea.core.moveInsideParentheses
import org.jetbrains.kotlin.idea.core.replaced
import org.jetbrains.kotlin.idea.intentions.branchedTransformations.BranchedFoldingUtils
import org.jetbrains.kotlin.idea.search.usagesSearch.descriptor
import org.jetbrains.kotlin.idea.util.IdeDescriptorRenderers
import org.jetbrains.kotlin.lexer.KtTokens
import org.jetbrains.kotlin.psi.*
import org.jetbrains.kotlin.psi.psiUtil.collectDescendantsOfType
import org.jetbrains.kotlin.psi.psiUtil.endOffset
import org.jetbrains.kotlin.psi.psiUtil.getStrictParentOfType
import org.jetbrains.kotlin.psi.psiUtil.quoteIfNeeded
import org.jetbrains.kotlin.resolve.BindingContext
import org.jetbrains.kotlin.resolve.bindingContextUtil.getTargetFunctionDescriptor
import org.jetbrains.kotlin.resolve.calls.util.getParameterForArgument
import org.jetbrains.kotlin.resolve.calls.util.getResolvedCall
import org.jetbrains.kotlin.resolve.lazy.BodyResolveMode
import org.jetbrains.kotlin.types.KotlinType
import org.jetbrains.kotlin.types.TypeConstructor
import org.jetbrains.kotlin.types.error.ErrorType
import org.jetbrains.kotlin.types.isFlexible
import org.jetbrains.kotlin.types.typeUtil.isTypeParameter
import org.jetbrains.kotlin.types.typeUtil.isUnit
import org.jetbrains.kotlin.types.typeUtil.makeNotNullable
class LambdaToAnonymousFunctionIntention : SelfTargetingIntention<KtLambdaExpression>(
KtLambdaExpression::class.java,
KotlinBundle.lazyMessage("convert.to.anonymous.function"),
KotlinBundle.lazyMessage("convert.lambda.expression.to.anonymous.function")
), LowPriorityAction {
override fun isApplicableTo(element: KtLambdaExpression, caretOffset: Int): Boolean {
val argument = element.getStrictParentOfType<KtValueArgument>()
val call = argument?.getStrictParentOfType<KtCallElement>()
if (call?.getStrictParentOfType<KtFunction>()?.hasModifier(KtTokens.INLINE_KEYWORD) == true) return false
val context = element.analyze(BodyResolveMode.PARTIAL)
if (call?.getResolvedCall(context)?.getParameterForArgument(argument)?.type?.isSuspendFunctionType == true) return false
val descriptor = context[
BindingContext.DECLARATION_TO_DESCRIPTOR,
element.functionLiteral,
] as? AnonymousFunctionDescriptor ?: return false
if (descriptor.valueParameters.any { it.isDestructuring() || it.type is ErrorType }) return false
val lastElement = element.functionLiteral.arrow ?: element.functionLiteral.lBrace
return caretOffset <= lastElement.endOffset
}
override fun applyTo(element: KtLambdaExpression, editor: Editor?) {
val functionDescriptor = element.functionLiteral.descriptor as? AnonymousFunctionDescriptor ?: return
val resultingFunction = convertLambdaToFunction(element, functionDescriptor) ?: return
val argument = when (val parent = resultingFunction.parent) {
is KtLambdaArgument -> parent
is KtLabeledExpression -> parent.replace(resultingFunction).parent as? KtLambdaArgument
else -> null
} ?: return
argument.moveInsideParentheses(argument.analyze(BodyResolveMode.PARTIAL))
}
private fun ValueParameterDescriptor.isDestructuring() = this is ValueParameterDescriptorImpl.WithDestructuringDeclaration
companion object {
fun convertLambdaToFunction(
lambda: KtLambdaExpression,
functionDescriptor: FunctionDescriptor,
functionName: String = "",
functionParameterName: (ValueParameterDescriptor, Int) -> String = { parameter, _ ->
val parameterName = parameter.name
if (parameterName.isSpecial) "_" else parameterName.asString().quoteIfNeeded()
},
typeParameters: Map<TypeConstructor, KotlinType> = emptyMap(),
replaceElement: (KtNamedFunction) -> KtExpression = { lambda.replaced(it) }
): KtExpression? {
val typeSourceCode = IdeDescriptorRenderers.SOURCE_CODE_TYPES
val functionLiteral = lambda.functionLiteral
val bodyExpression = functionLiteral.bodyExpression ?: return null
val context = bodyExpression.analyze(BodyResolveMode.PARTIAL)
val functionLiteralDescriptor by lazy { functionLiteral.descriptor }
bodyExpression.collectDescendantsOfType<KtReturnExpression>().forEach {
val targetDescriptor = it.getTargetFunctionDescriptor(context)
if (targetDescriptor == functionDescriptor || targetDescriptor == functionLiteralDescriptor) it.labeledExpression?.delete()
}
val psiFactory = KtPsiFactory(lambda)
val function = psiFactory.createFunction(
KtPsiFactory.CallableBuilder(KtPsiFactory.CallableBuilder.Target.FUNCTION).apply {
typeParams()
functionDescriptor.extensionReceiverParameter?.type?.let {
receiver(typeSourceCode.renderType(it))
}
name(functionName)
for ((index, parameter) in functionDescriptor.valueParameters.withIndex()) {
val type = parameter.type.let { if (it.isFlexible()) it.makeNotNullable() else it }
val renderType = typeSourceCode.renderType(
getTypeFromParameters(type, typeParameters)
)
val parameterName = functionParameterName(parameter, index)
param(parameterName, renderType)
}
functionDescriptor.returnType?.takeIf { !it.isUnit() }?.let {
val lastStatement = bodyExpression.statements.lastOrNull()
if (lastStatement != null && lastStatement !is KtReturnExpression) {
val foldableReturns = BranchedFoldingUtils.getFoldableReturns(lastStatement)
if (foldableReturns == null || foldableReturns.isEmpty()) {
lastStatement.replace(psiFactory.createExpressionByPattern("return $0", lastStatement))
}
}
val renderType = typeSourceCode.renderType(
getTypeFromParameters(it, typeParameters)
)
returnType(renderType)
} ?: noReturnType()
blockBody(" " + bodyExpression.text)
}.asString()
)
val result = wrapInParenthesisIfNeeded(replaceElement(function), psiFactory)
ShortenReferences.DEFAULT.process(result)
return result
}
private fun getTypeFromParameters(
type: KotlinType,
typeParameters: Map<TypeConstructor, KotlinType>
): KotlinType {
if (type.isTypeParameter())
return typeParameters[type.constructor] ?: type
return type
}
private fun wrapInParenthesisIfNeeded(expression: KtExpression, psiFactory: KtPsiFactory): KtExpression {
val parent = expression.parent ?: return expression
val grandParent = parent.parent ?: return expression
if (parent is KtCallExpression && grandParent !is KtParenthesizedExpression && grandParent !is KtDeclaration) {
return expression.replaced(psiFactory.createExpressionByPattern("($0)", expression))
}
return expression
}
}
}
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