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/*
* Copyright 2010-2016 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jetbrains.kotlin.psi.psiUtil
import com.intellij.extapi.psi.StubBasedPsiElementBase
import com.intellij.openapi.util.TextRange
import com.intellij.psi.PsiElement
import com.intellij.psi.PsiParameter
import com.intellij.psi.PsiParameterList
import com.intellij.psi.PsiWhiteSpace
import com.intellij.psi.stubs.StubElement
import com.intellij.psi.tree.TokenSet
import org.jetbrains.kotlin.KtNodeTypes
import org.jetbrains.kotlin.diagnostics.DiagnosticSink
import org.jetbrains.kotlin.diagnostics.Errors
import org.jetbrains.kotlin.lexer.KtModifierKeywordToken
import org.jetbrains.kotlin.lexer.KtTokens
import org.jetbrains.kotlin.name.Name
import org.jetbrains.kotlin.psi.*
import org.jetbrains.kotlin.psi.stubs.KotlinClassOrObjectStub
import org.jetbrains.kotlin.resolve.BindingContext
import org.jetbrains.kotlin.resolve.calls.callUtil.getResolvedCall
import org.jetbrains.kotlin.resolve.calls.model.ArgumentMatch
import org.jetbrains.kotlin.types.expressions.OperatorConventions
import java.util.*
// NOTE: in this file we collect only Kotlin-specific methods working with PSI and not modifying it
// ----------- Calls and qualified expressions ---------------------------------------------------------------------------------------------
fun KtCallElement.getCallNameExpression(): KtSimpleNameExpression? {
val calleeExpression = calleeExpression ?: return null
return when (calleeExpression) {
is KtSimpleNameExpression -> calleeExpression
is KtConstructorCalleeExpression -> calleeExpression.constructorReferenceExpression
else -> null
}
}
/**
* Returns enclosing qualifying element for given [[KtSimpleNameExpression]]
* ([[KtQualifiedExpression]] or [[KtUserType]] or original expression)
*/
fun KtSimpleNameExpression.getQualifiedElement(): KtElement {
val baseExpression = (parent as? KtCallExpression) ?: this
val parent = baseExpression.parent
return when (parent) {
is KtQualifiedExpression -> if (parent.selectorExpression == baseExpression) parent else baseExpression
is KtUserType -> if (parent.referenceExpression == baseExpression) parent else baseExpression
else -> baseExpression
}
}
fun KtSimpleNameExpression.getQualifiedElementOrCallableRef(): KtElement {
val parent = parent
if (parent is KtCallableReferenceExpression && parent.callableReference == this) return parent
return getQualifiedElement()
}
fun KtSimpleNameExpression.getTopmostParentQualifiedExpressionForSelector(): KtQualifiedExpression? {
return generateSequence(this) {
val parentQualified = it.parent as? KtQualifiedExpression
if (parentQualified?.selectorExpression == it) parentQualified else null
}.last() as? KtQualifiedExpression
}
/**
* Returns rightmost selector of the qualified element (null if there is no such selector)
*/
fun KtElement.getQualifiedElementSelector(): KtElement? {
return when (this) {
is KtSimpleNameExpression -> this
is KtCallExpression -> calleeExpression
is KtQualifiedExpression -> {
val selector = selectorExpression
(selector as? KtCallExpression)?.calleeExpression ?: selector
}
is KtUserType -> referenceExpression
else -> null
}
}
fun KtSimpleNameExpression.getReceiverExpression(): KtExpression? {
val parent = parent
when {
parent is KtQualifiedExpression -> {
val receiverExpression = parent.receiverExpression
// Name expression can't be receiver for itself
if (receiverExpression != this) {
return receiverExpression
}
}
parent is KtCallExpression -> {
//This is in case `a().b()`
val callExpression = parent
val grandParent = callExpression.parent
if (grandParent is KtQualifiedExpression) {
val parentsReceiver = grandParent.receiverExpression
if (parentsReceiver != callExpression) {
return parentsReceiver
}
}
}
parent is KtBinaryExpression && parent.operationReference == this -> {
return if (parent.operationToken in OperatorConventions.IN_OPERATIONS) parent.right else parent.left
}
parent is KtUnaryExpression && parent.operationReference == this -> {
return parent.baseExpression
}
parent is KtUserType -> {
val qualifier = parent.qualifier
if (qualifier != null) {
return qualifier.referenceExpression!!
}
}
}
return null
}
fun KtElement.getQualifiedExpressionForSelector(): KtQualifiedExpression? {
val parent = parent
return if (parent is KtQualifiedExpression && parent.selectorExpression == this) parent else null
}
fun KtExpression.getQualifiedExpressionForSelectorOrThis(): KtExpression {
return getQualifiedExpressionForSelector() ?: this
}
fun KtExpression.getQualifiedExpressionForReceiver(): KtQualifiedExpression? {
val parent = parent
return if (parent is KtQualifiedExpression && parent.receiverExpression == this) parent else null
}
fun KtExpression.getQualifiedExpressionForReceiverOrThis(): KtExpression {
return getQualifiedExpressionForReceiver() ?: this
}
fun KtExpression.isDotReceiver(): Boolean =
(parent as? KtDotQualifiedExpression)?.receiverExpression == this
// ---------- Block expression -------------------------------------------------------------------------------------------------------------
fun KtElement.blockExpressionsOrSingle(): Sequence =
if (this is KtBlockExpression) statements.asSequence() else sequenceOf(this)
fun KtExpression.lastBlockStatementOrThis(): KtExpression
= (this as? KtBlockExpression)?.statements?.lastOrNull() ?: this
fun KtBlockExpression.contentRange(): PsiChildRange {
val first = (lBrace?.nextSibling ?: firstChild)
?.siblings(withItself = false)
?.firstOrNull { it !is PsiWhiteSpace }
val rBrace = rBrace
if (first == rBrace) return PsiChildRange.EMPTY
val last = rBrace!!
.siblings(forward = false, withItself = false)
.first { it !is PsiWhiteSpace }
if (last == lBrace) return PsiChildRange.EMPTY
return PsiChildRange(first, last)
}
// ----------- Inheritance -----------------------------------------------------------------------------------------------------------------
fun KtClass.isAbstract(): Boolean = isInterface() || hasModifier(KtTokens.ABSTRACT_KEYWORD)
/**
* Returns the list of unqualified names that are indexed as the superclass names of this class. For the names that might be imported
* via an aliased import, includes both the original and the aliased name (reference resolution during inheritor search will sort this out).
*
* @return the list of possible superclass names
*/
fun StubBasedPsiElementBase>.getSuperNames(): List {
fun addSuperName(result: MutableList, referencedName: String): Unit {
result.add(referencedName)
val file = containingFile
if (file is KtFile) {
val directive = file.findImportByAlias(referencedName)
if (directive != null) {
var reference = directive.importedReference
while (reference is KtDotQualifiedExpression) {
reference = reference.selectorExpression
}
if (reference is KtSimpleNameExpression) {
result.add(reference.getReferencedName())
}
}
}
}
require(this is KtClassOrObject) { "it should be ${KtClassOrObject::class} but it is a ${this::class.java.name}" }
val stub = stub
if (stub != null) {
return stub.getSuperNames()
}
val specifiers = (this as KtClassOrObject).superTypeListEntries
if (specifiers.isEmpty()) return Collections.emptyList()
val result = ArrayList()
for (specifier in specifiers) {
val superType = specifier.typeAsUserType
if (superType != null) {
val referencedName = superType.referencedName
if (referencedName != null) {
addSuperName(result, referencedName)
}
}
}
return result
}
// ------------ Annotations ----------------------------------------------------------------------------------------------------------------
// Annotations on labeled expression lies on it's base expression
fun KtExpression.getAnnotationEntries(): List {
val parent = parent
return when (parent) {
is KtAnnotatedExpression -> parent.annotationEntries
is KtLabeledExpression -> parent.getAnnotationEntries()
else -> emptyList()
}
}
fun KtAnnotationsContainer.collectAnnotationEntriesFromStubOrPsi(): List {
return when (this) {
is StubBasedPsiElementBase<*> -> getStub()?.collectAnnotationEntriesFromStubElement() ?: collectAnnotationEntriesFromPsi()
else -> collectAnnotationEntriesFromPsi()
}
}
private fun StubElement<*>.collectAnnotationEntriesFromStubElement(): List {
return childrenStubs.flatMap {
child ->
when (child.stubType) {
KtNodeTypes.ANNOTATION_ENTRY -> listOf(child.psi as KtAnnotationEntry)
KtNodeTypes.ANNOTATION -> (child.psi as KtAnnotation).entries
else -> emptyList()
}
}
}
private fun KtAnnotationsContainer.collectAnnotationEntriesFromPsi(): List {
return children.flatMap { child ->
when (child) {
is KtAnnotationEntry -> listOf(child)
is KtAnnotation -> child.entries
else -> emptyList()
}
}
}
// -------- Recursive tree visiting --------------------------------------------------------------------------------------------------------
// Calls `block` on each descendant of T type
// Note, that calls happen in order of DFS-exit, so deeper nodes are applied earlier
inline fun forEachDescendantOfTypeVisitor(noinline block: (T) -> Unit): KtVisitorVoid {
return object : KtTreeVisitorVoid() {
override fun visitKtElement(element: KtElement) {
super.visitKtElement(element)
if (element is T) {
block(element)
}
}
}
}
inline fun flatMapDescendantsOfTypeVisitor(accumulator: MutableCollection, noinline map: (T) -> Collection): KtVisitorVoid {
return forEachDescendantOfTypeVisitor { accumulator.addAll(map(it)) }
}
// ----------- Other -----------------------------------------------------------------------------------------------------------------------
fun KtClassOrObject.effectiveDeclarations(): List {
return when(this) {
is KtClass -> getDeclarations() + getPrimaryConstructorParameters().filter { p -> p.hasValOrVar() }
else -> declarations
}
}
fun PsiElement.isExtensionDeclaration(): Boolean {
val callable: KtCallableDeclaration? = when (this) {
is KtNamedFunction, is KtProperty -> this as KtCallableDeclaration
is KtPropertyAccessor -> getNonStrictParentOfType()
else -> null
}
return callable?.receiverTypeReference != null
}
fun KtClassOrObject.isObjectLiteral(): Boolean = this is KtObjectDeclaration && isObjectLiteral()
//TODO: strange method, and not only Kotlin specific (also Java)
fun PsiElement.parameterIndex(): Int {
val parent = parent
return when {
this is KtParameter && parent is KtParameterList -> parent.parameters.indexOf(this)
this is PsiParameter && parent is PsiParameterList -> parent.getParameterIndex(this)
else -> -1
}
}
fun KtModifierListOwner.isPrivate(): Boolean = hasModifier(KtTokens.PRIVATE_KEYWORD)
fun KtModifierListOwner.isProtected(): Boolean = hasModifier(KtTokens.PROTECTED_KEYWORD)
fun KtSimpleNameExpression.isImportDirectiveExpression(): Boolean {
val parent = parent
return parent is KtImportDirective || parent.parent is KtImportDirective
}
fun KtSimpleNameExpression.isPackageDirectiveExpression(): Boolean {
val parent = parent
return parent is KtPackageDirective || parent.parent is KtPackageDirective
}
fun KtExpression.isInImportDirective(): Boolean {
return parents.takeWhile { it !is KtDeclaration && it !is KtBlockExpression }.any { it is KtImportDirective }
}
fun KtExpression.isLambdaOutsideParentheses(): Boolean {
val parent = parent
return when (parent) {
is KtLambdaArgument -> true
is KtLabeledExpression -> parent.isLambdaOutsideParentheses()
else -> false
}
}
fun KtExpression.getAssignmentByLHS(): KtBinaryExpression? {
val parent = parent as? KtBinaryExpression ?: return null
return if (KtPsiUtil.isAssignment(parent) && parent.left == this) parent else null
}
fun KtStringTemplateExpression.getContentRange(): TextRange {
val start = node.firstChildNode.textLength
val lastChild = node.lastChildNode
val length = textLength
return TextRange(start, if (lastChild.elementType == KtTokens.CLOSING_QUOTE) length - lastChild.textLength else length)
}
val KtStringTemplateExpression.plainContent: String
get() = getContentRange().substring(text)
fun KtStringTemplateExpression.isSingleQuoted(): Boolean
= node.firstChildNode.textLength == 1
fun KtNamedDeclaration.getValueParameters(): List {
return getValueParameterList()?.parameters ?: Collections.emptyList()
}
fun KtNamedDeclaration.getValueParameterList(): KtParameterList? {
return when (this) {
is KtCallableDeclaration -> valueParameterList
is KtClass -> getPrimaryConstructorParameterList()
else -> null
}
}
fun KtLambdaArgument.getLambdaArgumentName(bindingContext: BindingContext): Name? {
val callExpression = parent as KtCallExpression
val resolvedCall = callExpression.getResolvedCall(bindingContext)
return (resolvedCall?.getArgumentMapping(this) as? ArgumentMatch)?.valueParameter?.name
}
fun KtExpression.asAssignment(): KtBinaryExpression? =
if (KtPsiUtil.isAssignment(this)) this as KtBinaryExpression else null
private fun KtDeclaration.modifierFromTokenSet(set: TokenSet): PsiElement? {
val modifierList = modifierList ?: return null
return set.types
.asSequence()
.map { modifierList.getModifier(it as KtModifierKeywordToken) }
.firstOrNull { it != null }
}
fun KtDeclaration.visibilityModifier() = modifierFromTokenSet(KtTokens.VISIBILITY_MODIFIERS)
fun KtDeclaration.visibilityModifierType(): KtModifierKeywordToken?
= visibilityModifier()?.node?.elementType as KtModifierKeywordToken?
private val MODALITY_MODIFIERS = TokenSet.create(
KtTokens.ABSTRACT_KEYWORD, KtTokens.FINAL_KEYWORD, KtTokens.SEALED_KEYWORD, KtTokens.OPEN_KEYWORD
)
fun KtDeclaration.modalityModifier() = modifierFromTokenSet(MODALITY_MODIFIERS)
fun KtStringTemplateExpression.isPlain() = entries.all { it is KtLiteralStringTemplateEntry }
fun KtStringTemplateExpression.isPlainWithEscapes() = entries.all { it is KtLiteralStringTemplateEntry || it is KtEscapeStringTemplateEntry }
// Correct for class members only (including constructors and nested classes)
// Returns null e.g. for member function parameters, member function locals, property accessors
val KtDeclaration.containingClassOrObject: KtClassOrObject?
get() = parent.let {
when (it) {
is KtClassBody -> it.parent as? KtClassOrObject
is KtClassOrObject -> it
is KtParameterList -> (it.parent as? KtPrimaryConstructor)?.getContainingClassOrObject()
else -> null
}
}
fun KtExpression.getOutermostParenthesizerOrThis(): KtExpression {
return (parentsWithSelf.zip(parents)).firstOrNull {
val (element, parent) = it
when (parent) {
is KtParenthesizedExpression -> false
is KtAnnotatedExpression -> parent.baseExpression != element
is KtLabeledExpression -> parent.baseExpression != element
else -> true
}
}?.first as KtExpression? ?: this
}
fun PsiElement.isFunctionalExpression(): Boolean = this is KtNamedFunction && nameIdentifier == null
private val BAD_NEIGHBOUR_FOR_SIMPLE_TEMPLATE_ENTRY_PATTERN = Regex("[a-zA-Z0-9_].*")
fun canPlaceAfterSimpleNameEntry(element: PsiElement?): Boolean {
val entryText = element?.text ?: return true
return !BAD_NEIGHBOUR_FOR_SIMPLE_TEMPLATE_ENTRY_PATTERN.matches(entryText)
}
fun checkReservedPrefixWord(sink: DiagnosticSink, element: PsiElement, word: String, message: String) {
KtPsiUtil.getPreviousWord(element, word)?.let {
sink.report(Errors.UNSUPPORTED.on(it, message))
}
}
fun checkReservedYield(expression: KtSimpleNameExpression?, sink: DiagnosticSink) {
// do not force identifier calculation for elements from stubs.
if (expression?.getReferencedName() != "yield") return
val identifier = expression.getIdentifier() ?: return
if (identifier.node.elementType == KtTokens.IDENTIFIER && "yield" == identifier.text) {
sink.report(Errors.YIELD_IS_RESERVED.on(identifier, "Identifier 'yield' is reserved. Use backticks to call it: `yield`"))
}
}
val MESSAGE_FOR_YIELD_BEFORE_LAMBDA = "Reserved yield block/lambda. Use 'yield() { ... }' or 'yield(fun...)'"
fun checkReservedYieldBeforeLambda(element: PsiElement, sink: DiagnosticSink) {
KtPsiUtil.getPreviousWord(element, "yield")?.let {
sink.report(Errors.YIELD_IS_RESERVED.on(it, MESSAGE_FOR_YIELD_BEFORE_LAMBDA))
}
}
fun KtElement.nonStaticOuterClasses(): Sequence {
return generateSequence(containingClass()) { if (it.isInner()) it.containingClass() else null }
}
fun KtElement.containingClass(): KtClass? = getStrictParentOfType()
fun KtClassOrObject.findPropertyByName(name: String): KtNamedDeclaration? {
return declarations.firstOrNull { it is KtProperty && it.name == name } as KtNamedDeclaration?
?: primaryConstructorParameters.firstOrNull { it.hasValOrVar() && it.name == name }
}
fun isTypeConstructorReference(e: PsiElement): Boolean {
val parent = e.parent
return parent is KtUserType && parent.referenceExpression == e
}
fun KtParameter.isPropertyParameter() = ownerFunction is KtPrimaryConstructor && hasValOrVar()
fun isDoubleColonReceiver(expression: KtExpression) = expression.getParentOfTypeAndBranch { this.receiverExpression } != null
fun KtFunctionLiteral.getOrCreateParameterList(): KtParameterList {
valueParameterList?.let { return it }
val psiFactory = KtPsiFactory(this)
val anchor = lBrace
val newParameterList = addAfter(psiFactory.createLambdaParameterList("x"), anchor) as KtParameterList
newParameterList.removeParameter(0)
if (arrow == null) {
val whitespaceAndArrow = psiFactory.createWhitespaceAndArrow()
addRangeAfter(whitespaceAndArrow.first, whitespaceAndArrow.second, newParameterList)
}
return newParameterList
}
fun KtCallExpression.getOrCreateValueArgumentList(): KtValueArgumentList {
valueArgumentList?.let { return it }
return addAfter(KtPsiFactory(this).createCallArguments("()"),
typeArgumentList ?: calleeExpression) as KtValueArgumentList
}
fun KtDeclaration.hasBody() = when (this) {
is KtFunction -> hasBody()
is KtProperty -> hasBody()
else -> false
}
fun KtExpression.referenceExpression(): KtReferenceExpression? =
(if (this is KtCallExpression) calleeExpression else this) as? KtReferenceExpression
fun KtExpression.getLabeledParent(labelName: String): KtLabeledExpression? {
parents.forEach {
when (it) {
is KtLabeledExpression -> if (it.getLabelName() == labelName) return it
is KtParenthesizedExpression, is KtAnnotatedExpression, is KtLambdaExpression -> return@forEach
else -> return null
}
}
return null
}
