Contents

# frozen_string_literal: true

module Mutant
  module AST
    # Given an AST, finds the sclass that directly(-ish) contains the provided
    # node.
    # This won't match arbitrarily complex structures - it only searches the
    # first level deep (no begins-in-begins, for example). This is in
    # keeping with mutant generally not supporting 'weird' syntax.
    # Descending into 'begin' nodes is supported because these are generated for
    # the one-line syntax class << self; def foo; end
    class FindMetaclassContaining
      include NodePredicates, Concord.new(:root, :target), Procto.call

      SCLASS_BODY_INDEX = 1

      private_constant(*constants(false))

      # Find metaclass node containing target node
      #
      # @return [Parser::AST::Node, nil]
      #
      # @api private
      def call
        AST.find_last_path(root) do |current|
          next unless n_sclass?(current)

          metaclass_of?(current)
        end.last
      end

    private

      def metaclass_of?(sclass)
        body = sclass.children.fetch(SCLASS_BODY_INDEX)
        body.equal?(target) || transparently_contains?(body)
      end

      def transparently_contains?(body)
        n_begin?(body) && include_exact?(body.children, target)
      end

      def include_exact?(haystack, needle)
        haystack.any? { |elem| elem.equal?(needle) }
      end
    end
  end
end

Version data entries

30 entries across 30 versions & 1 rubygems

Version	Path
mutant-0.10.25	lib/mutant/ast/find_metaclass_containing.rb
mutant-0.10.24	lib/mutant/ast/find_metaclass_containing.rb
mutant-0.10.23	lib/mutant/ast/find_metaclass_containing.rb
mutant-0.10.22	lib/mutant/ast/find_metaclass_containing.rb
mutant-0.10.21	lib/mutant/ast/find_metaclass_containing.rb
mutant-0.10.20	lib/mutant/ast/find_metaclass_containing.rb
mutant-0.10.19	lib/mutant/ast/find_metaclass_containing.rb
mutant-0.10.18	lib/mutant/ast/find_metaclass_containing.rb
mutant-0.10.17	lib/mutant/ast/find_metaclass_containing.rb
mutant-0.10.16	lib/mutant/ast/find_metaclass_containing.rb
mutant-0.10.15	lib/mutant/ast/find_metaclass_containing.rb
mutant-0.10.14	lib/mutant/ast/find_metaclass_containing.rb
mutant-0.10.13	lib/mutant/ast/find_metaclass_containing.rb
mutant-0.10.12	lib/mutant/ast/find_metaclass_containing.rb
mutant-0.10.11	lib/mutant/ast/find_metaclass_containing.rb
mutant-0.10.10	lib/mutant/ast/find_metaclass_containing.rb
mutant-0.10.9	lib/mutant/ast/find_metaclass_containing.rb
mutant-0.10.8	lib/mutant/ast/find_metaclass_containing.rb
mutant-0.10.7	lib/mutant/ast/find_metaclass_containing.rb
mutant-0.10.6	lib/mutant/ast/find_metaclass_containing.rb