class Prism::CaseNode
^^^^^^^^^^
end
when false
case true
Represents the use of a case statement.
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 :case_node end
def accept(visitor)
def accept(visitor) visitor.visit_case_node(self) end
def case_keyword
def case_keyword case_keyword_loc.slice end
def child_nodes
def child_nodes [predicate, *conditions, consequent] end
def comment_targets
def comment_targets [*predicate, *conditions, *consequent, case_keyword_loc, end_keyword_loc] end
def compact_child_nodes
def compact_child_nodes compact = [] compact << predicate if predicate compact.concat(conditions) compact << consequent if consequent compact end
def copy(**params)
def copy(**params) CaseNode.new( params.fetch(:predicate) { predicate }, params.fetch(:conditions) { conditions }, params.fetch(:consequent) { consequent }, params.fetch(:case_keyword_loc) { case_keyword_loc }, params.fetch(:end_keyword_loc) { end_keyword_loc }, params.fetch(:location) { location }, ) end
def deconstruct_keys(keys)
def deconstruct_keys(keys) { predicate: predicate, conditions: conditions, consequent: consequent, case_keyword_loc: case_keyword_loc, end_keyword_loc: end_keyword_loc, location: location } end
def end_keyword
def end_keyword end_keyword_loc.slice end
def initialize(predicate, conditions, consequent, case_keyword_loc, end_keyword_loc, location)
def initialize(predicate, conditions, consequent, case_keyword_loc, end_keyword_loc, location) @newline = false @predicate = predicate @conditions = conditions @consequent = consequent @case_keyword_loc = case_keyword_loc @end_keyword_loc = end_keyword_loc @location = location end
def inspect(inspector = NodeInspector.new)
def inspect(inspector = NodeInspector.new) inspector << inspector.header(self) if (predicate = self.predicate).nil? inspector << "├── predicate: ∅\n" else inspector << "├── predicate:\n" inspector << predicate.inspect(inspector.child_inspector("│ ")).delete_prefix(inspector.prefix) end inspector << "├── conditions: #{inspector.list("#{inspector.prefix}│ ", conditions)}" if (consequent = self.consequent).nil? inspector << "├── consequent: ∅\n" else inspector << "├── consequent:\n" inspector << consequent.inspect(inspector.child_inspector("│ ")).delete_prefix(inspector.prefix) end inspector << "├── case_keyword_loc: #{inspector.location(case_keyword_loc)}\n" inspector << "└── end_keyword_loc: #{inspector.location(end_keyword_loc)}\n" inspector.to_str 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 :case_node end