class Prism::CaseMatchNode

Represents the use of a case statement for pattern matching.

case true
in false
end
^^^^^^^^^

Attributes

conditions[R]

Represents the conditions of the case match.

case true; in false; end
           ^^^^^^^^

else_clause[R]

Represents the else clause of the case match.

case true; in false; else; end
                     ^^^^

predicate[R]

Represents the predicate of the case match. This can be either ‘nil` or any [non-void expressions](github.com/ruby/prism/blob/main/docs/parsing_rules.md#non-void-expression).

case true; in false; end
^^^^

Public Class Methods

new(source, node_id, location, flags, predicate, conditions, else_clause, case_keyword_loc, end_keyword_loc) click to toggle source

Initialize a new CaseMatchNode node.

# File prism/node.rb, line 3526
def initialize(source, node_id, location, flags, predicate, conditions, else_clause, case_keyword_loc, end_keyword_loc)
  @source = source
  @node_id = node_id
  @location = location
  @flags = flags
  @predicate = predicate
  @conditions = conditions
  @else_clause = else_clause
  @case_keyword_loc = case_keyword_loc
  @end_keyword_loc = end_keyword_loc
end

type() click to toggle source

Return a symbol representation of this node type. See ‘Node::type`.

# File prism/node.rb, line 3646
def self.type
  :case_match_node
end

Public Instance Methods

===(other) click to toggle source

Implements case-equality for the node. This is effectively == but without comparing the value of locations. Locations are checked only for presence.

# File prism/node.rb, line 3652
def ===(other)
  other.is_a?(CaseMatchNode) &&
    (predicate === other.predicate) &&
    (conditions.length == other.conditions.length) &&
    conditions.zip(other.conditions).all? { |left, right| left === right } &&
    (else_clause === other.else_clause) &&
    (case_keyword_loc.nil? == other.case_keyword_loc.nil?) &&
    (end_keyword_loc.nil? == other.end_keyword_loc.nil?)
end

accept(visitor) click to toggle source

def accept: (Visitor visitor) -> void

# File prism/node.rb, line 3539
def accept(visitor)
  visitor.visit_case_match_node(self)
end

case_keyword() click to toggle source

def case_keyword: () -> String

# File prism/node.rb, line 3626
def case_keyword
  case_keyword_loc.slice
end

case_keyword_loc() click to toggle source

Represents the location of the ‘case` keyword.

case true; in false; end
^^^^

# File prism/node.rb, line 3597
def case_keyword_loc
  location = @case_keyword_loc
  return location if location.is_a?(Location)
  @case_keyword_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
end

child_nodes() click to toggle source

def child_nodes: () -> Array[nil | Node]

# File prism/node.rb, line 3544
def child_nodes
  [predicate, *conditions, else_clause]
end

Also aliased as: deconstruct

comment_targets() click to toggle source

def comment_targets: () -> Array[Node | Location]

# File prism/node.rb, line 3558
def comment_targets
  [*predicate, *conditions, *else_clause, case_keyword_loc, end_keyword_loc] #: Array[Prism::node | Location]
end

compact_child_nodes() click to toggle source

def compact_child_nodes: () -> Array

# File prism/node.rb, line 3549
def compact_child_nodes
  compact = [] #: Array[Prism::node]
  compact << predicate if predicate
  compact.concat(conditions)
  compact << else_clause if else_clause
  compact
end

consequent() click to toggle source

Returns the else clause of the case match node. This method is deprecated in favor of else_clause.

# File prism/node_ext.rb, line 467
def consequent
  deprecated("else_clause")
  else_clause
end

copy(node_id: self.node_id, location: self.location, flags: self.flags, predicate: self.predicate, conditions: self.conditions, else_clause: self.else_clause, case_keyword_loc: self.case_keyword_loc, end_keyword_loc: self.end_keyword_loc) click to toggle source

def copy: (?node_id: Integer, ?location: Location, ?flags: Integer, ?predicate: Prism::node?, ?conditions: Array, ?else_clause: ElseNode?, ?case_keyword_loc: Location, ?end_keyword_loc: Location) -> CaseMatchNode

# File prism/node.rb, line 3563
def copy(node_id: self.node_id, location: self.location, flags: self.flags, predicate: self.predicate, conditions: self.conditions, else_clause: self.else_clause, case_keyword_loc: self.case_keyword_loc, end_keyword_loc: self.end_keyword_loc)
  CaseMatchNode.new(source, node_id, location, flags, predicate, conditions, else_clause, case_keyword_loc, end_keyword_loc)
end

deconstruct()

def deconstruct: () -> Array[nil | Node]

Alias for: child_nodes

deconstruct_keys(keys) click to toggle source

def deconstruct_keys: (Array keys) -> { node_id: Integer, location: Location, predicate: Prism::node?, conditions: Array, else_clause: ElseNode?, case_keyword_loc: Location, end_keyword_loc: Location }

# File prism/node.rb, line 3571
def deconstruct_keys(keys)
  { node_id: node_id, location: location, predicate: predicate, conditions: conditions, else_clause: else_clause, case_keyword_loc: case_keyword_loc, end_keyword_loc: end_keyword_loc }
end

end_keyword() click to toggle source

def end_keyword: () -> String

# File prism/node.rb, line 3631
def end_keyword
  end_keyword_loc.slice
end

end_keyword_loc() click to toggle source

Represents the location of the ‘end` keyword.

case true; in false; end
                     ^^^

# File prism/node.rb, line 3613
def end_keyword_loc
  location = @end_keyword_loc
  return location if location.is_a?(Location)
  @end_keyword_loc = Location.new(source, location >> 32, location & 0xFFFFFFFF)
end

inspect() click to toggle source

def inspect -> String

# File prism/node.rb, line 3636
def inspect
  InspectVisitor.compose(self)
end

save_case_keyword_loc(repository) click to toggle source

Save the case_keyword_loc location using the given saved source so that it can be retrieved later.

# File prism/node.rb, line 3605
def save_case_keyword_loc(repository)
  repository.enter(node_id, :case_keyword_loc)
end

save_end_keyword_loc(repository) click to toggle source

Save the end_keyword_loc location using the given saved source so that it can be retrieved later.

# File prism/node.rb, line 3621
def save_end_keyword_loc(repository)
  repository.enter(node_id, :end_keyword_loc)
end

type() click to toggle source

Return a symbol representation of this node type. See ‘Node#type`.

# File prism/node.rb, line 3641
def type
  :case_match_node
end