TreeApi
Related Doc:
package Trees
Can this tree carry attributes (i.e.
Can this tree carry attributes (i.e. symbols, types or positions)?
Typically the answer is yes, except for the EmptyTree null object and
two special singletons: noSelfType and pendingSuperCall.
The direct child trees of this tree.
The direct child trees of this tree. EmptyTrees are always omitted. Lists are flattened.
Apply pf to each subtree on which the function is defined and collect the results.
Make a copy of this tree, keeping all attributes, except that all positions are focused (so nothing in this tree will be found when searching by position).
Tests whether two trees are structurally equal.
Tests whether two trees are structurally equal.
Note that == on trees is reference equality.
Is there exists a part of this tree which satisfies predicate p?
Find all subtrees matching predicate p.
Find all subtrees matching predicate p. Same as withFilter
Returns optionally first tree (in a preorder traversal) which satisfies predicate p,
or None if none exists.
Do all parts of this tree satisfy predicate p?
Apply f to each subtree
Does this tree represent a definition? (of a method, of a class, etc)
Is this tree one of the empty trees?
Is this tree one of the empty trees?
Empty trees are: the EmptyTree null object and TypeTree instances that don't carry a type.
canHaveAttrs
The canonical way to test if a Tree represents a term.
The canonical way to test if a Tree represents a type.
Is this tree not an empty tree?
Is this tree not an empty tree?
isEmpty
Provides an alternate if tree is empty
Provides an alternate if tree is empty
The alternate tree
If this tree is non empty, this tree, otherwise alt.
Position of the tree.
Symbol of the tree.
Symbol of the tree.
For most trees symbol is null. In SymTrees,
it is overridden and implemented with a var, initialized to NoSymbol.
Trees which are not SymTrees but which carry symbols do so by
overriding def symbol to forward it elsewhere. Examples:
Super(qual, _) has qual's symbol,Apply(fun, args) has fun's symbol,TypeApply(fun, args) has fun's symbol,AppliedTypeTree(tpt, args) has tpt's symbol,TypeTree(tpe) has tpe's typeSymbol, if tpe != null.
Type of the tree.
Type of the tree.
Upon creation most trees have their tpe set to null.
Types are typically assigned to trees during typechecking.
Some node factory methods set tpe immediately after creation.
When the typechecker encounters a tree with a non-null tpe,
it will assume it to be correct and not check it again. This means one has
to be careful not to erase the tpe field of subtrees.
Find all subtrees matching predicate p.
Find all subtrees matching predicate p. Same as filter
Test two objects for inequality.
Test two objects for inequality.
true if !(this == that), false otherwise.
Equivalent to x.hashCode except for boxed numeric types and null.
Equivalent to x.hashCode except for boxed numeric types and null.
For numerics, it returns a hash value which is consistent
with value equality: if two value type instances compare
as true, then ## will produce the same hash value for each
of them.
For null returns a hashcode where null.hashCode throws a
NullPointerException.
a hash value consistent with ==
The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).
The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).
true if the receiver object is equivalent to the argument; false otherwise.
Cast the receiver object to be of type T0.
Cast the receiver object to be of type T0.
Note that the success of a cast at runtime is modulo Scala's erasure semantics.
Therefore the expression 1.asInstanceOf[String] will throw a ClassCastException at
runtime, while the expression List(1).asInstanceOf[List[String]] will not.
In the latter example, because the type argument is erased as part of compilation it is
not possible to check whether the contents of the list are of the requested type.
the receiver object.
ClassCastException if the receiver object is not an instance of the erasure of type T0.
Create a copy of the receiver object.
Create a copy of the receiver object.
The default implementation of the clone method is platform dependent.
a copy of the receiver object.
not specified by SLS as a member of AnyRef
Tests whether the argument (that) is a reference to the receiver object (this).
Tests whether the argument (that) is a reference to the receiver object (this).
The eq method implements an equivalence relation on
non-null instances of AnyRef, and has three additional properties:
x and y of type AnyRef, multiple invocations of
x.eq(y) consistently returns true or consistently returns false.x of type AnyRef, x.eq(null) and null.eq(x) returns false.null.eq(null) returns true. When overriding the equals or hashCode methods, it is important to ensure that their behavior is
consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2), they
should be equal to each other (o1 == o2) and they should hash to the same value (o1.hashCode == o2.hashCode).
true if the argument is a reference to the receiver object; false otherwise.
The equality method for reference types.
Called by the garbage collector on the receiver object when there are no more references to the object.
Called by the garbage collector on the receiver object when there are no more references to the object.
The details of when and if the finalize method is invoked, as
well as the interaction between finalize and non-local returns
and exceptions, are all platform dependent.
not specified by SLS as a member of AnyRef
A representation that corresponds to the dynamic class of the receiver object.
A representation that corresponds to the dynamic class of the receiver object.
The nature of the representation is platform dependent.
a representation that corresponds to the dynamic class of the receiver object.
not specified by SLS as a member of AnyRef
The hashCode method for reference types.
Test whether the dynamic type of the receiver object is T0.
Test whether the dynamic type of the receiver object is T0.
Note that the result of the test is modulo Scala's erasure semantics.
Therefore the expression 1.isInstanceOf[String] will return false, while the
expression List(1).isInstanceOf[List[String]] will return true.
In the latter example, because the type argument is erased as part of compilation it is
not possible to check whether the contents of the list are of the specified type.
true if the receiver object is an instance of erasure of type T0; false otherwise.
Equivalent to !(this eq that).
Equivalent to !(this eq that).
true if the argument is not a reference to the receiver object; false otherwise.
Wakes up a single thread that is waiting on the receiver object's monitor.
Wakes up a single thread that is waiting on the receiver object's monitor.
not specified by SLS as a member of AnyRef
Wakes up all threads that are waiting on the receiver object's monitor.
Wakes up all threads that are waiting on the receiver object's monitor.
not specified by SLS as a member of AnyRef
Obtains string representation of a tree
The API that all trees support. The main source of information about trees is the scala.reflect.api.Trees page.