ConstantPattern class abstract final

A constant expression being used as a pattern.

The only expressions that can be validly used as a pattern are

  • bool literals
  • double literals
  • int literals
  • null literals
  • String literals
  • references to constant variables
  • constant constructor invocations
  • constant list literals
  • constant set or map literals
  • constant expressions wrapped in parentheses and preceded by the const keyword

This node is also used to recover from cases where a different kind of expression is used as a pattern, so clients need to handle the case where the expression isn't one of the valid alternatives.

constantPattern ::= 'const'? Expression

Implemented types

Properties

beginToken → Token
The first token included in this node's source range.
no setterinherited
childEntities → Iterable<SyntacticEntity>
An iterator that can be used to iterate through all the entities (either AST nodes or tokens) that make up the contents of this node, including doc comments but excluding other comments.
no setterinherited
constKeyword → Token?
The const keyword, or null if the expression isn't preceded by the keyword const.
no setter
end → int
The offset of the character immediately following the last character of this node's source range.
no setterinherited
endToken → Token
The last token included in this node's source range.
no setterinherited
expression → Expression
The constant expression being used as a pattern.
no setter
hashCode → int
The hash code for this object.
no setterinherited
isSynthetic → bool
Whether this node is a synthetic node.
no setterinherited
length → int
Return the number of characters in the syntactic entity's source range.
no setterinherited
matchedValueType → DartType?
The matched value type, or null if the node isn't resolved yet.
no setterinherited
offset → int
Return the offset from the beginning of the file to the first character in the syntactic entity.
no setterinherited
parent → AstNode?
Returns this node's parent node, or null if this node is the root of an AST structure.
no setterinherited
precedence → PatternPrecedence
The precedence of this pattern.
no setterinherited
root → AstNode
The node at the root of this node's AST structure.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
unParenthesized → DartPattern
If this pattern is a parenthesized pattern, the result of unwrapping the pattern inside the parentheses. Otherwise, this pattern.
no setterinherited

Methods

accept<E>(AstVisitor<E> visitor) → E?
Use the given visitor to visit this node.
inherited
findPrevious(Token target) → Token?
Returns the token before target, or null if it can't be found.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
thisOrAncestorMatching<E extends AstNode>(bool predicate(AstNode)) → E?
Returns either this node or the most immediate ancestor of this node for which the predicate returns true, or null if there's no such node.
inherited
thisOrAncestorOfType<E extends AstNode>() → E?
Returns either this node or the most immediate ancestor of this node that has the given type, or null if there's no such node.
inherited
toSource() → String
Returns a textual description of this node in a form approximating valid source.
inherited
toString() → String
A string representation of this object.
inherited
visitChildren(AstVisitor visitor) → void
Use the given visitor to visit all of the children of this node.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited