KtElement¶

@SubclassOptInRequired(markerClass = [KtImplementationDetail::class])
interface KtElement : NavigatablePsiElement, KtPureElement

The root interface of the Kotlin PSI (Program Structure Interface) hierarchy.

A KtElement is a single node in the syntax tree of a Kotlin source file. Every Kotlin-specific PSI node — expressions, declarations, type references, and so on — implements this interface, so it is the common entry point for tree traversal and source attribution. The root of a tree of KtElements is a KtFile.

KtElement describes only the syntactic structure of the code. To reason about its semantics (resolved symbols, types, overload resolution, and so on), use the Analysis API on top of the PSI.

Prefer type-safe traversal via the visitors (accept, acceptChildren, KtVisitor, KtTreeVisitor) over the generic com.intellij.psi.PsiElement navigation methods where possible.

Inheritors¶

Properties¶

`allChildren`¶

val PsiElement.allChildren: PsiChildRange

The range of all direct children of this element, or an empty range if it has none.

`children`¶

@get:Contract(pure = true)
@get:NotNull
abstract val children: @NotNull Array<out @NotNull PsiElement>

`containingFile`¶

@get:Contract(pure = true)
abstract val containingFile: PsiFile?

`containingKtFile`¶

@get:NotNull
abstract val containingKtFile: KtFile

`context`¶

@get:Nullable
@get:Contract(pure = true)
abstract val context: @Nullable PsiElement?

`endOffset`¶

val PsiElement.endOffset: Int

The offset just past the end of this element's text range in the file.

`firstChild`¶

@get:Contract(pure = true)
abstract val firstChild: PsiElement?

`isPhysical`¶

@get:Contract(pure = true)
abstract val isPhysical: Boolean

`isValid`¶

@get:Contract(pure = true)
abstract val isValid: Boolean

`isWritable`¶

@get:Contract(pure = true)
abstract val isWritable: Boolean

`language`¶

@get:NotNull
@get:Contract(pure = true)
abstract val language: @NotNull Language

`lastChild`¶

@get:Contract(pure = true)
abstract val lastChild: PsiElement?

`manager`¶

@get:Contract(pure = true)
abstract val manager: PsiManager?

`name`¶

@get:Nullable
@get:NlsSafe
abstract val name: @Nullable @NlsSafe String?

`navigationElement`¶

@get:Contract(pure = true)
abstract val navigationElement: PsiElement?

`nextLeafs`¶

val PsiElement.nextLeafs: Sequence<PsiElement>

The following leaf elements as a lazy sequence, nearest first.

`nextSibling`¶

@get:Contract(pure = true)
abstract val nextSibling: PsiElement?

`node`¶

@get:Contract(pure = true)
abstract val node: ASTNode?

`originalElement`¶

@get:Contract(pure = true)
abstract val originalElement: PsiElement?

`ownDeclarations`¶

@get:NotNull
open val ownDeclarations: @NotNull Collection<out @NotNull PsiSymbolDeclaration>

`ownReferences`¶

@get:NotNull
open val ownReferences: @NotNull Collection<out @NotNull PsiSymbolReference>

`parent`¶

@get:Contract(pure = true)
abstract override val parent: PsiElement?

`parents`¶

val PsiElement.parents: Sequence<PsiElement>

The ancestors of this element, from its immediate parent up to and including the containing file.

`parentsWithSelf`¶

val PsiElement.parentsWithSelf: Sequence<PsiElement>

This element and its ancestors, from the element itself up to and including the containing file.

`presentation`¶

@get:Nullable
abstract val presentation: @Nullable ItemPresentation?

`prevLeafs`¶

val PsiElement.prevLeafs: Sequence<PsiElement>

The preceding leaf elements as a lazy sequence, nearest first.

`prevSibling`¶

@get:Contract(pure = true)
abstract val prevSibling: PsiElement?

`project`¶

@get:NotNull
@get:Contract(pure = true)
abstract val project: @NotNull Project

`psiOrParent`¶

@get:NotNull
abstract val psiOrParent: KtElement

`pureEndOffset`¶

val KtPureElement.pureEndOffset: Int

The end offset of this element's source.

`pureStartOffset`¶

val KtPureElement.pureStartOffset: Int

The start offset of this element's source, excluding any leading comments.

reference¶

abstract override val reference: PsiReference?

`references`¶

@get:Contract(pure = true)
abstract val references: @NotNull Array<out PsiReference?>

`resolveScope`¶

@get:NotNull
@get:Contract(pure = true)
abstract val resolveScope: @NotNull GlobalSearchScope

`startOffset`¶

val PsiElement.startOffset: Int

The offset of the start of this element's text range in the file.

`startOffsetInParent`¶

@get:Contract(pure = true)
abstract val startOffsetInParent: Int

`startOffsetSkippingComments`¶

val PsiElement.startOffsetSkippingComments: Int

The start offset of this element, skipping leading comments and the whitespace that follows them.

`text`¶

@get:Contract(pure = true)
@get:NlsSafe
abstract val text: @NlsSafe String?

`textLength`¶

@get:Contract(pure = true)
abstract val textLength: Int

`textOffset`¶

@get:Contract(pure = true)
abstract val textOffset: Int

`textRange`¶

@get:Contract(pure = true)
abstract val textRange: TextRange?

`textRangeInParent`¶

@get:Contract(pure = true)
@get:NotNull
open val textRangeInParent: @NotNull TextRange

`textRangeWithoutComments`¶

val PsiElement.textRangeWithoutComments: TextRange

The text range of this element excluding any leading comments.

`useScope`¶

@get:NotNull
@get:Contract(pure = true)
abstract val useScope: @NotNull SearchScope

Functions¶

`accept`¶

abstract fun accept(p0: @NotNull PsiElementVisitor)

abstract fun <R, D> accept(visitor: KtVisitor<R, D>, data: D): R

Dispatches this element to the corresponding visit* method of the given visitor and returns its result.

`acceptChildren`¶

abstract fun acceptChildren(p0: @NotNull PsiElementVisitor)

abstract fun <D> acceptChildren(visitor: KtVisitor<Void, D>, data: D)

Passes each direct child of this element to the given visitor.

`add`¶

abstract fun add(p0: @NotNull PsiElement): PsiElement?

`addAfter`¶

abstract fun addAfter(p0: @NotNull PsiElement, p1: @Nullable PsiElement?): PsiElement?

`addBefore`¶

abstract fun addBefore(p0: @NotNull PsiElement, p1: @Nullable PsiElement?): PsiElement?

`addRange`¶

abstract fun addRange(p0: PsiElement?, p1: PsiElement?): PsiElement?

`addRangeAfter`¶

abstract fun addRangeAfter(
    p0: PsiElement?, 
    p1: PsiElement?, 
    p2: PsiElement?
): PsiElement?

`addRangeBefore`¶

abstract fun addRangeBefore(
    p0: @NotNull PsiElement, 
    p1: @NotNull PsiElement, 
    p2: PsiElement?
): PsiElement?

`anyDescendantOfType`¶

inline fun <reified T : PsiElement> PsiElement.anyDescendantOfType(noinline predicate: (T) -> Boolean = { true }): Boolean

Returns true if this element or any descendant of type T satisfies predicate.

inline fun <reified T : PsiElement> PsiElement.anyDescendantOfType(crossinline canGoInside: (PsiElement) -> Boolean, noinline predicate: (T) -> Boolean = { true }): Boolean

Returns true if this element or any descendant of type T satisfies predicate. canGoInside controls traversal into children but does not prevent the current element from being tested.

`before`¶

fun PsiElement.before(element: PsiElement): Boolean

Returns true if this element ends at or before element starts (that is, it precedes element in the file).

`blockExpressionsOrSingle`¶

fun KtElement.blockExpressionsOrSingle(): Sequence<KtElement>

Returns the statements of this element if it is a block, otherwise a single-element sequence of this element.

`canNavigate`¶

open fun canNavigate(): Boolean

`canNavigateToSource`¶

open fun canNavigateToSource(): Boolean

`checkAdd`¶

abstract fun checkAdd(p0: @NotNull PsiElement)

`checkDecompiledText`¶

fun PsiElement.checkDecompiledText()

Throws if this element belongs to a compiled file that is backed by a stub. Loading decompiled text is slow and should be avoided; stubs should be used instead. Called by the descendant-traversal helpers as a guard.

`checkDelete`¶

abstract fun checkDelete()

`collectDescendantsOfType`¶

inline fun <reified T : PsiElement> PsiElement.collectDescendantsOfType(noinline predicate: (T) -> Boolean = { true }): List<T>

Collects this element and all descendants of type T satisfying predicate into a list in post-order.

inline fun <reified T : PsiElement> PsiElement.collectDescendantsOfType(crossinline canGoInside: (PsiElement) -> Boolean, noinline predicate: (T) -> Boolean = { true }): List<T>

Collects this element and all descendants of type T satisfying predicate into a list in post-order. canGoInside controls traversal into children but does not prevent the current element from being collected.

`collectDescendantsOfTypeTo`¶

inline fun <reified T : PsiElement, C : MutableCollection<T>> PsiElement.collectDescendantsOfTypeTo(
    to: C, 
    crossinline canGoInside: (PsiElement) -> Boolean, 
    noinline predicate: (T) -> Boolean = { true }
): C

Adds this element and all descendants of type T satisfying predicate to to in post-order. canGoInside controls traversal into children but does not prevent the current element from being added.

`containingClass`¶

fun KtElement.containingClass(): KtClass?

Returns the nearest enclosing KtClass, or null if there is none.

`copy`¶

abstract fun copy(): PsiElement?

`delete`¶

abstract fun delete()

`deleteChildRange`¶

abstract fun deleteChildRange(p0: PsiElement?, p1: PsiElement?)

`findDescendantOfType`¶

inline fun <reified T : PsiElement> PsiElement.findDescendantOfType(noinline predicate: (T) -> Boolean = { true }): T?

Returns the first element of type T in a pre-order traversal of this element and its descendants that satisfies predicate, or null if there is none.

inline fun <reified T : PsiElement> PsiElement.findDescendantOfType(crossinline canGoInside: (PsiElement) -> Boolean, noinline predicate: (T) -> Boolean = { true }): T?

Returns the first element of type T in a pre-order traversal of this element and its descendants that satisfies predicate, or null. canGoInside controls traversal into children but does not prevent the current element from being tested.

`findElementAt`¶

abstract fun findElementAt(p0: Int): @Nullable PsiElement?

`findReferenceAt`¶

abstract fun findReferenceAt(p0: Int): @Nullable PsiReference?

`forEachDescendantOfType`¶

inline fun <reified T : PsiElement> PsiElement.forEachDescendantOfType(noinline action: (T) -> Unit)

Applies action to this element and every descendant of type T, in post-order (children before parents).

inline fun <reified T : PsiElement> PsiElement.forEachDescendantOfType(crossinline canGoInside: (PsiElement) -> Boolean, noinline action: (T) -> Unit)

Applies action to this element and every descendant of type T, in post-order. canGoInside controls whether each visited element's children are traversed; the element itself is still passed to action when it is a T, even if canGoInside returns false for it.

`forEachDescendantOfTypeInPreorder`¶

inline fun <reified T : PsiElement> PsiElement.forEachDescendantOfTypeInPreorder(noinline action: (T) -> Unit)

Applies action to this element and every descendant of type T, in pre-order (parents before children).

inline fun <reified T : PsiElement> PsiElement.forEachDescendantOfTypeInPreorder(crossinline canGoInside: (PsiElement) -> Boolean, noinline action: (T) -> Unit)

Applies action to this element and every descendant of type T, in pre-order. canGoInside controls whether each visited element's children are traversed; the element itself is still passed to action when it is a T, even if canGoInside returns false for it.

`getAssignmentLhsIfUnwrappable`¶

fun PsiElement.getAssignmentLhsIfUnwrappable(): PsiElement?

Returns the operand this operation applies to, but only when that operand is wrapped in parentheses, a label, or annotations; returns null otherwise.

`getChildOfType`¶

inline fun <reified T : PsiElement> PsiElement.getChildOfType(): T?

Returns the first direct child of type T, or null if there is none.

`getChildrenOfType`¶

inline fun <reified T : PsiElement> PsiElement.getChildrenOfType(): Array<T>

Returns the direct children of type T, or an empty array if there are none.

`getCopyableUserData`¶

abstract fun <T> getCopyableUserData(p0: @NotNull Key<T?>): @Nullable T?

`getElementTextWithContext`¶

fun PsiElement.getElementTextWithContext(): String

Returns this element's text with surrounding source context, for use in diagnostics and log messages.

`getExplicitReceiverOfDotQualified`¶

fun PsiElement.getExplicitReceiverOfDotQualified(): PsiElement?

Returns the source of the explicit receiver if this element is a dot-qualified expression, or null otherwise.

`getIcon`¶

abstract fun getIcon(p0: Int): Icon?

`getLastParentOfTypeInRow`¶

inline fun <reified T : PsiElement> PsiElement.getLastParentOfTypeInRow(): T?

Returns the outermost element in an uninterrupted chain of ancestors of type T, or null if the parent is not a T.

`getLastParentOfTypeInRowWithSelf`¶

inline fun <reified T : PsiElement> PsiElement.getLastParentOfTypeInRowWithSelf(): T?

Like getLastParentOfTypeInRow, but the chain may start at this element itself.

getModificationStamp¶

fun KtElement.getModificationStamp(): Long

Returns the modification stamp of the nearest enclosing element that tracks one (a file, a stub-based declaration, or a supertype list). The stamp changes whenever that element's subtree is modified, so it can be used to invalidate caches keyed on this element.

`getNextSiblingIgnoringWhitespace`¶

fun PsiElement.getNextSiblingIgnoringWhitespace(withItself: Boolean = false): PsiElement?

Returns the next sibling that is not whitespace, or null. Considers this element if withItself.

`getNextSiblingIgnoringWhitespaceAndComments`¶

fun PsiElement.getNextSiblingIgnoringWhitespaceAndComments(withItself: Boolean = false): PsiElement?

Returns the next sibling that is neither whitespace nor a comment, or null. Considers this element if withItself.

`getNonStrictParentOfType`¶

inline fun <reified T : PsiElement> PsiElement.getNonStrictParentOfType(): T?

Returns the nearest ancestor of type T including this element, or null if there is none.

fun <T : PsiElement> PsiElement.getNonStrictParentOfType(parentClass: Class<T>): T?

Returns the nearest ancestor of type T (including this element), or null if there is none.

`getOutermostParentContainedIn`¶

tailrec fun PsiElement.getOutermostParentContainedIn(container: PsiElement): PsiElement?

Returns the outermost element on the path from this element that is still strictly contained in container, or null.

`getParent`¶

@Contract(pure = true)
abstract fun getParent(): PsiElement?

`getParentOfType`¶

inline fun <reified T : PsiElement> PsiElement.getParentOfType(strict: Boolean): T?

Returns the nearest ancestor of type T, or null. When strict is false, this element itself is also considered.

inline fun <reified T : PsiElement> PsiElement.getParentOfType(strict: Boolean, vararg stopAt: Class<out PsiElement>): T?

Returns the nearest ancestor of type T, stopping the search once an ancestor of any type in stopAt is reached, or null. When strict is false, this element itself is also considered.

`getParentOfTypeAndBranch`¶

inline fun <reified T : PsiElement> PsiElement.getParentOfTypeAndBranch(strict: Boolean = false, noinline branch: T.() -> PsiElement?): T?

Checks the nearest element of type T and returns it if this element lies within the subtree selected by branch. If that candidate's branch does not contain this element, returns null without checking higher ancestors. When strict is false, this element itself is also considered as the candidate.

`getParentOfTypeAndBranches`¶

inline fun <reified T : PsiElement> PsiElement.getParentOfTypeAndBranches(strict: Boolean = false, noinline branches: T.() -> Iterable<PsiElement?>): T?

Checks the nearest element of type T and returns it if this element lies within any subtree selected by branches. If none of that candidate's branches contain this element, returns null without checking higher ancestors. When strict is false, this element itself is also considered as the candidate.

`getParentOfTypes`¶

fun <T : PsiElement> PsiElement.getParentOfTypes(strict: Boolean = false, vararg parentClasses: Class<out T>): T?

Returns the nearest ancestor that is an instance of one of parentClasses, or null if there is none. When strict is false, this element itself is also considered.

`getParentOfTypes2`¶

inline fun <reified T : PsiElement, reified V : PsiElement> PsiElement.getParentOfTypes2(): PsiElement?

Returns the nearest strict ancestor that is a T or V, or null if there is none.

`getParentOfTypes3`¶

inline fun <reified T : PsiElement, reified V : PsiElement, reified U : PsiElement> PsiElement.getParentOfTypes3(): PsiElement?

Returns the nearest strict ancestor that is a T, V, or U, or null if there is none.

`getParentOfTypesAndPredicate`¶

fun <T : PsiElement> PsiElement.getParentOfTypesAndPredicate(
    strict: Boolean = false, 
    vararg parentClasses: Class<out T>, 
    predicate: (T) -> Boolean
): T?

Returns the nearest ancestor that is an instance of one of parentClasses and satisfies predicate, or null. When parentClasses is empty, any type matches. When strict is false, this element itself is also considered.

`getPrevSiblingIgnoringWhitespace`¶

fun PsiElement.getPrevSiblingIgnoringWhitespace(withItself: Boolean = false): PsiElement?

Returns the previous sibling that is not whitespace, or null. Considers this element if withItself.

`getPrevSiblingIgnoringWhitespaceAndComments`¶

fun PsiElement.getPrevSiblingIgnoringWhitespaceAndComments(withItself: Boolean = false): PsiElement?

Returns the previous sibling that is neither whitespace nor a comment, or null. Considers this element if withItself.

`getQualifiedElementSelector`¶

fun KtElement.getQualifiedElementSelector(): KtElement?

Returns the rightmost selector of this qualified element, or null if there is no such selector.

`getQualifiedExpressionForSelector`¶

fun KtElement.getQualifiedExpressionForSelector(): KtQualifiedExpression?

Returns the qualified expression in which this element is the selector, or null if it is not a selector.

`getStartOffsetIn`¶

fun PsiElement.getStartOffsetIn(ancestor: PsiElement): Int

Returns the offset of this element relative to the start of ancestor (which must be an ancestor of this element).

`getStrictParentOfType`¶

inline fun <reified T : PsiElement> PsiElement.getStrictParentOfType(): T?

Returns the nearest strict ancestor of type T, or null if there is none.

`getTextWithLocation`¶

fun PsiElement.getTextWithLocation(): String

Returns this element's text together with its source location, for use in diagnostics and log messages.

`getTopmostParentOfType`¶

inline fun <reified T : PsiElement> PsiElement.getTopmostParentOfType(): T?

Returns the outermost ancestor of type T including this element, or null if there is none.

`getUserData`¶

abstract fun <T> getUserData(p0: @NotNull Key<T?>): @Nullable T?

`isAncestor`¶

fun PsiElement?.isAncestor(element: PsiElement, strict: Boolean = false): Boolean

Returns true if this element is an ancestor of element. When strict is false, an element is its own ancestor.

`isContextualDeclaration`¶

fun KtElement.isContextualDeclaration(): Boolean

Returns true if this callable, class, or object declares at least one legacy context receiver. Named context parameters are ignored.

`isEquivalentTo`¶

abstract fun isEquivalentTo(p0: PsiElement?): Boolean

`isExtensionDeclaration`¶

fun PsiElement.isExtensionDeclaration(): Boolean

Returns true if this element is an extension function or property (that is, it declares a receiver).

`isFirstStatement`¶

fun KtElement.isFirstStatement(): Boolean

Returns true if this element is the first statement of its enclosing block.

`isFunctionalExpression`¶

fun PsiElement.isFunctionalExpression(): Boolean

Returns true if this element is an anonymous function, such as the fun expression in val predicate = fun(x: Int): Boolean = x > 0.

`isInsideOf`¶

fun PsiElement.isInsideOf(elements: Iterable<PsiElement>): Boolean

Returns true if this element lies within, or is equal to, any of the given elements.

`isTopLevelKtOrJavaMember`¶

fun PsiElement.isTopLevelKtOrJavaMember(): Boolean

Returns true if this element is a top-level member of a Kotlin file or a top-level Java class.

`navigate`¶

open fun navigate(requestFocus: Boolean)

`navigationRequest`¶

open fun navigationRequest(): @Nullable NavigationRequest?

`nextLeaf`¶

fun PsiElement.nextLeaf(skipEmptyElements: Boolean = false): PsiElement?

Returns the next leaf element in the tree, or null if there is none. Empty leaves are skipped if skipEmptyElements.

fun PsiElement.nextLeaf(filter: (PsiElement) -> Boolean): PsiElement?

Returns the nearest following leaf that satisfies filter, or null if there is none.

`nonStaticOuterClasses`¶

fun KtElement.nonStaticOuterClasses(): Sequence<KtClass>

Returns the enclosing classes that this element can access an outer instance of, from innermost to outermost.

`parameterIndex`¶

fun PsiElement.parameterIndex(): Int

Returns the index of this parameter within its own parameter list (Kotlin or Java), or -1 if it is not a parameter.

`prevLeaf`¶

fun PsiElement.prevLeaf(skipEmptyElements: Boolean = false): PsiElement?

Returns the previous leaf element in the tree, or null if there is none. Empty leaves are skipped if skipEmptyElements.

fun PsiElement.prevLeaf(filter: (PsiElement) -> Boolean): PsiElement?

Returns the nearest preceding leaf that satisfies filter, or null if there is none.

`processDeclarations`¶

abstract fun processDeclarations(
    p0: @NotNull PsiScopeProcessor, 
    p1: @NotNull ResolveState, 
    p2: @Nullable PsiElement?, 
    p3: @NotNull PsiElement
): Boolean

`putCopyableUserData`¶

abstract fun <T> putCopyableUserData(p0: @NotNull Key<T?>, p1: @Nullable T?)

`putUserData`¶

abstract fun <T> putUserData(p0: @NotNull Key<T?>, p1: @Nullable T?)

rawDelete¶

abstract fun rawDelete()

Deletes this PSI element using the raw platform implementation, bypassing Kotlin PSI-specific delete overrides.

Regular clients should use delete instead. When KtPsiMutationService is not registered, it performs the same plain deletion, and when the service is registered, as in the IntelliJ Kotlin plugin, it may also adjust the surrounding code, e.g., delete a semicolon that follows the element.

`replace`¶

abstract fun replace(p0: @NotNull PsiElement): PsiElement?

`siblings`¶

fun PsiElement.siblings(forward: Boolean = true, withItself: Boolean = true): Sequence<PsiElement>

Returns the siblings of this element as a lazy sequence, going forward (or backward) and optionally including the element itself (withItself).

`startsWithComment`¶

fun PsiElement.startsWithComment(): Boolean

Returns true if this element's first child is a comment.

`textContains`¶

abstract fun textContains(p0: Char): Boolean

`textMatches`¶

abstract fun textMatches(p0: @NotNull PsiElement): Boolean

abstract fun textMatches(p0: @NotNull @NonNls CharSequence): Boolean

`textToCharArray`¶

abstract fun textToCharArray(): @NotNull CharArray

`unwrapParenthesesLabelsAndAnnotations`¶

fun PsiElement?.unwrapParenthesesLabelsAndAnnotations(): PsiElement?

Recursively unwraps this element while it is a parenthesized, labeled, or annotated expression, returning the innermost base element. A non-wrapper element is returned unchanged.

`unwrapParenthesesLabelsAndAnnotationsDeeply`¶

fun PsiElement.unwrapParenthesesLabelsAndAnnotationsDeeply(): PsiElement

Walks up through immediately enclosing parentheses, labels, and annotations, returning the first parent outside that wrapper chain.