class Prism::ArrayPatternNode
^^^^^^^^^^^^^^^^^^^
foo in Bar[1, 2, 3]
^^^^^^^^^^^^
foo in Bar[]
^^^^^^^^^
foo in *1
^^^^^^^^^^^^^
foo in [1, 2]
^^^^^^^^^^^
foo in 1, 2
Represents an array pattern in pattern matching.
def self.type
class, but should be faster in a case statement or an array comparison.
Note that like #type, it will still be slower than using == for a single
splitting on the type of the node without having to do a long === chain.
Similar to #type, this method returns a symbol that you can use for
def self.type :array_pattern_node end
def accept(visitor)
def accept(visitor) visitor.visit_array_pattern_node(self) end
def child_nodes
def child_nodes [constant, *requireds, rest, *posts] end
def closing
def closing closing_loc&.slice end
def comment_targets
def comment_targets [*constant, *requireds, *rest, *posts, *opening_loc, *closing_loc] end
def compact_child_nodes
def compact_child_nodes compact = [] compact << constant if constant compact.concat(requireds) compact << rest if rest compact.concat(posts) compact end
def copy(**params)
def copy(**params) ArrayPatternNode.new( params.fetch(:constant) { constant }, params.fetch(:requireds) { requireds }, params.fetch(:rest) { rest }, params.fetch(:posts) { posts }, params.fetch(:opening_loc) { opening_loc }, params.fetch(:closing_loc) { closing_loc }, params.fetch(:location) { location }, ) end
def deconstruct_keys(keys)
def deconstruct_keys(keys) { constant: constant, requireds: requireds, rest: rest, posts: posts, opening_loc: opening_loc, closing_loc: closing_loc, location: location } end
def initialize(constant, requireds, rest, posts, opening_loc, closing_loc, location)
def initialize(constant, requireds, rest, posts, opening_loc, closing_loc, location) @newline = false @constant = constant @requireds = requireds @rest = rest @posts = posts @opening_loc = opening_loc @closing_loc = closing_loc @location = location end
def inspect(inspector = NodeInspector.new)
def inspect(inspector = NodeInspector.new) inspector << inspector.header(self) if (constant = self.constant).nil? inspector << "├── constant: ∅\n" else inspector << "├── constant:\n" inspector << constant.inspect(inspector.child_inspector("│ ")).delete_prefix(inspector.prefix) end inspector << "├── requireds: #{inspector.list("#{inspector.prefix}│ ", requireds)}" if (rest = self.rest).nil? inspector << "├── rest: ∅\n" else inspector << "├── rest:\n" inspector << rest.inspect(inspector.child_inspector("│ ")).delete_prefix(inspector.prefix) end inspector << "├── posts: #{inspector.list("#{inspector.prefix}│ ", posts)}" inspector << "├── opening_loc: #{inspector.location(opening_loc)}\n" inspector << "└── closing_loc: #{inspector.location(closing_loc)}\n" inspector.to_str end
def opening
def opening opening_loc&.slice end
def type
keys will use a jump table.
you can take advantage of the fact that case statements with all symbol
it uses a single integer comparison, but also because if you're on CRuby
can use for comparison. This is faster than the other approaches because
Instead, you can call #type, which will return to you a symbol that you
method calls, and/or array allocations.
these approaches are relatively slow because of the constant lookups,
case statement and doing `case node; when cls1; when cls2; end`. Both of
calling `[cls1, cls2].include?(node.class)` or putting the node into a
classes to see what kind of behavior to perform. Usually this is done by
Sometimes you want to check an instance of a node against a list of
def type :array_pattern_node end