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scala3-compiler-bootstrapped/dotty.tools/dotty.tools.dotc/dotty.tools.dotc.ast/Trees/UnApply

UnApply

dotty.tools.dotc.ast.Trees.UnApply
case class UnApply[+T <: Untyped] extends ProxyTree[T], PatternTree[T]

The typed translation of extractor(patterns) in a pattern. The translation has the following components:

Value parameters

fun

is extractor.unapply (or, for backwards compatibility, extractor.unapplySeq) possibly with type parameters

implicits

Any implicit parameters passed to the unapply after the selector

patterns

The argument patterns in the pattern match. It is typed with same type as first fun argument Given a match selector sel a pattern UnApply(fun, implicits, patterns) is roughly translated as follows val result = fun(sel)(implicits) if (result.isDefined) "match patterns against result"

Attributes

Graph
Supertypes
trait Serializable
trait PatternTree[T]
class ProxyTree[T]
class Tree[T]
trait Showable
trait Container
trait LinkSource
class Positioned
trait Cloneable
trait Product
trait Equals
trait SrcPos
class Object
trait Matchable
class Any
Show all

Members list

Type members

Types

type ThisTree[+T <: Untyped] = UnApply[T]

The type constructor at the root of the tree

The type constructor at the root of the tree

Attributes

Value members

Concrete methods

def forwardTo: Tree[T]

Inherited methods

final def allAttachments: List[(Key[_], Any)]

The list of all keys and values attached to this container.

The list of all keys and values attached to this container.

Attributes

Inherited from:
LinkSource
final def attachment[V](key: Key[V]): V

The attachment corresponding to key.

The attachment corresponding to key.

Attributes

Throws
NoSuchElementException

if no attachment with key exists

Inherited from:
LinkSource
final def attachmentOrElse[V](key: Key[V], default: V): V

The attachment corresponding to key, or default if no attachment with key exists.

The attachment corresponding to key, or default if no attachment with key exists.

Attributes

Inherited from:
LinkSource
def checkPos(nonOverlapping: Boolean)(using Context): Unit

Check that all positioned items in this tree satisfy the following conditions:

Check that all positioned items in this tree satisfy the following conditions:

  • Parent spans contain child spans
  • If item is a non-empty tree, it has a position

Attributes

Inherited from:
Positioned
def cloneIn(src: SourceFile): Positioned.this.type

Clone this node but assign it a fresh id which marks it as a node in file.

Clone this node but assign it a fresh id which marks it as a node in file.

Attributes

Inherited from:
Positioned
def contains(that: Positioned): Boolean

Attributes

Inherited from:
Positioned
override def denot(using Context): Denotation

The denotation referred to by this tree. Defined for DenotingTrees and ProxyTrees, NoDenotation for other kinds of trees

The denotation referred to by this tree. Defined for DenotingTrees and ProxyTrees, NoDenotation for other kinds of trees

Attributes

Definition Classes
Inherited from:
ProxyTree
def endPos(using ctx: Context): SourcePosition

Attributes

Inherited from:
SrcPos
def envelope(src: SourceFile, startSpan: Span): Span

The union of startSpan and the spans of all positioned children that have the same source as this node, except that Inlined nodes only consider their call child.

The union of startSpan and the spans of all positioned children that have the same source as this node, except that Inlined nodes only consider their call child.

Side effect: Any descendants without spans have but with the same source as this node have their span set to the end position of the envelope of all children to the left, or, if that one does not exist, to the start position of the envelope of all children to the right.

Attributes

Inherited from:
Positioned
override def equals(that: Any): Boolean

Compares the receiver object (this) with the argument object (that) for equivalence.

Compares the receiver object (this) with the argument object (that) for equivalence.

Any implementation of this method should be an equivalence relation:

  • It is reflexive: for any instance x of type Any, x.equals(x) should return true.
  • It is symmetric: for any instances x and y of type Any, x.equals(y) should return true if and only if y.equals(x) returns true.
  • It is transitive: for any instances x, y, and z of type Any if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.

If you override this method, you should verify that your implementation remains an equivalence relation. Additionally, when overriding this method it is usually necessary to override hashCode to ensure that objects which are "equal" (o1.equals(o2) returns true) hash to the same scala.Int. (o1.hashCode.equals(o2.hashCode)).

Value parameters

that

the object to compare against this object for equality.

Attributes

Returns

true if the receiver object is equivalent to the argument; false otherwise.

Definition Classes
Tree -> Equals -> Any
Inherited from:
Tree
def fallbackToText(printer: Printer): Text

A fallback text representation, if the pattern matching in Printers does not have a case for this showable element

A fallback text representation, if the pattern matching in Printers does not have a case for this showable element

Attributes

Inherited from:
Showable
def focus(using ctx: Context): SourcePosition

Attributes

Inherited from:
SrcPos
def foreachInThicket(op: (Tree[T]) => Unit): Unit

If this is a thicket, perform op on each of its trees otherwise, perform op ion tree itself.

If this is a thicket, perform op on each of its trees otherwise, perform op ion tree itself.

Attributes

Inherited from:
Tree
final def getAttachment[V](key: Key[V]): Option[V]

Optionally get attachment corresponding to key

Optionally get attachment corresponding to key

Attributes

Inherited from:
LinkSource
final def hasAttachment[V](key: Key[V]): Boolean

Does an attachment corresponding to key exist?

Does an attachment corresponding to key exist?

Attributes

Inherited from:
LinkSource
final def hasType: Boolean

Does the tree have its type field set? Note: this operation is not referentially transparent, because it can observe the withType modifications. Should be used only in special circumstances (we need it for printing trees with optional type info).

Does the tree have its type field set? Note: this operation is not referentially transparent, because it can observe the withType modifications. Should be used only in special circumstances (we need it for printing trees with optional type info).

Attributes

Inherited from:
Tree
override def hashCode(): Int

Calculates a hash code value for the object.

Calculates a hash code value for the object.

The default hashing algorithm is platform dependent.

Note that it is allowed for two objects to have identical hash codes (o1.hashCode.equals(o2.hashCode)) yet not be equal (o1.equals(o2) returns false). A degenerate implementation could always return 0. However, it is required that if two objects are equal (o1.equals(o2) returns true) that they have identical hash codes (o1.hashCode.equals(o2.hashCode)). Therefore, when overriding this method, be sure to verify that the behavior is consistent with the equals method.

Attributes

Returns

the hash code value for this object.

Definition Classes
Tree -> Any
Inherited from:
Tree
def isDef: Boolean

Does this tree define a new symbol that is not defined elsewhere?

Does this tree define a new symbol that is not defined elsewhere?

Attributes

Inherited from:
Tree
def isEmpty: Boolean

Is this tree either the empty tree or the empty ValDef or an empty type ident?

Is this tree either the empty tree or the empty ValDef or an empty type ident?

Attributes

Inherited from:
Tree
override def isPattern: Boolean

Is this a legal part of a pattern which is not at the same time a term?

Is this a legal part of a pattern which is not at the same time a term?

Attributes

Definition Classes
Inherited from:
PatternTree
override def isTerm: Boolean

Does this tree represent a term?

Does this tree represent a term?

Attributes

Definition Classes
Inherited from:
ProxyTree
override def isType: Boolean

Does this tree represent a type?

Does this tree represent a type?

Attributes

Definition Classes
Inherited from:
ProxyTree
def line(using ctx: Context): Int

Attributes

Inherited from:
SrcPos
inline def orElse[U >: T <: Untyped](inline that: Tree[U]): Tree[U]

if this tree is the empty tree, the alternative, else this tree

if this tree is the empty tree, the alternative, else this tree

Attributes

Inherited from:
Tree
def productElementNames: Iterator[String]

Attributes

Inherited from:
Product
def productIterator: Iterator[Any]

Attributes

Inherited from:
Product
final def pushAttachment[V](key: Key[V], value: V)(using ctx: Context): Unit

Attributes

Inherited from:
Container
final def putAttachment[V](key: Key[V], value: V): Option[V]

Add attachment with given key and value.

Add attachment with given key and value.

Attributes

Returns

Optionally, the old attachment with given key if one existed before. The new attachment is added at the position of the old one, or at the end if no attachment with same key existed.

Inherited from:
LinkSource
final def removeAllAttachments(): Unit

Attributes

Inherited from:
Container
final def removeAttachment[V](key: Key[V]): Option[V]

Remove attachment with given key, if it exists.

Remove attachment with given key, if it exists.

Attributes

Returns

Optionally, the removed attachment with given key if one existed before.

Inherited from:
LinkSource
def sameTree(that: Tree[_]): Boolean

Attributes

Inherited from:
Tree
def show(using Context): String

The string representation of this showable element.

The string representation of this showable element.

Attributes

Inherited from:
Showable
def showIndented(margin: Int)(using Context): String

The string representation with each line after the first one indented by the given given margin (in spaces).

The string representation with each line after the first one indented by the given given margin (in spaces).

Attributes

Inherited from:
Showable
def showSummary(depth: Int)(using Context): String

The summarized string representation of this showable element. Recursion depth is limited to some smallish value. Default is Config.summarizeDepth.

The summarized string representation of this showable element. Recursion depth is limited to some smallish value. Default is Config.summarizeDepth.

Attributes

Inherited from:
Showable
def source: SourceFile

Attributes

Inherited from:
Positioned
def sourcePos(using Context): SourcePosition

Attributes

Inherited from:
Positioned
def span: Span

The span part of the item's position

The span part of the item's position

Attributes

Inherited from:
Positioned
def span_=(span: Span): Unit

Attributes

Inherited from:
Positioned
final def srcPos: SrcPos

This positioned item, widened to SrcPos. Used to make clear we only need the position, typically for error reporting.

This positioned item, widened to SrcPos. Used to make clear we only need the position, typically for error reporting.

Attributes

Inherited from:
Positioned
def startPos(using ctx: Context): SourcePosition

Attributes

Inherited from:
SrcPos
final def symbol(using Context): Symbol

Shorthand for denot.symbol.

Shorthand for denot.symbol.

Attributes

Inherited from:
Tree
def toList: List[Tree[T]]

Convert tree to a list. Gives a singleton list, except for thickets which return their element trees.

Convert tree to a list. Gives a singleton list, except for thickets which return their element trees.

Attributes

Inherited from:
Tree
override def toText(printer: Printer): Text

The text representation of this showable element. This normally dispatches to a pattern matching method in Printers.

The text representation of this showable element. This normally dispatches to a pattern matching method in Printers.

Attributes

Definition Classes
Inherited from:
Tree
final def tpe: T

The type of the tree. In case of an untyped tree, an UnAssignedTypeException is thrown. (Overridden by empty trees)

The type of the tree. In case of an untyped tree, an UnAssignedTypeException is thrown. (Overridden by empty trees)

Attributes

Inherited from:
Tree
def treeSize: Int

The number of nodes in this tree

The number of nodes in this tree

Attributes

Inherited from:
Tree
final def typeOpt: Type

Attributes

Inherited from:
Tree
def uniqueId: Int

A unique identifier in case -Yshow-tree-ids, or -Ydebug-tree-with-id is set, -1 otherwise.

A unique identifier in case -Yshow-tree-ids, or -Ydebug-tree-with-id is set, -1 otherwise.

Attributes

Inherited from:
Positioned
def withAttachment[V](key: Key[V], value: V): Container.this.type

Attributes

Inherited from:
Container
final def withAttachmentsFrom(container: Container): Container.this.type

Copy the sticky attachments from container to this container.

Copy the sticky attachments from container to this container.

Attributes

Inherited from:
Container
def withSpan(span: Span): Positioned.this.type

A positioned item like this one with given span. If the positioned item is source-derived, a clone is returned. If the positioned item is synthetic, the position is updated destructively and the item itself is returned.

A positioned item like this one with given span. If the positioned item is source-derived, a clone is returned. If the positioned item is synthetic, the position is updated destructively and the item itself is returned.

Attributes

Inherited from:
Positioned
def withType(tpe: Type)(using Context): ThisTree[Type]

Return a typed tree that's isomorphic to this tree, but has given type. (Overridden by empty trees)

Return a typed tree that's isomorphic to this tree, but has given type. (Overridden by empty trees)

Attributes

Inherited from:
Tree
def withTypeUnchecked(tpe: Type): ThisTree[Type]

Attributes

Inherited from:
Tree

Inherited fields

protected var myTpe: T

Attributes

Inherited from:
Tree
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Copyright (c) 2002-2024, LAMP/EPFL
Copyright (c) 2002-2024, LAMP/EPFL