Contents

# frozen_string_literal: true

module Mutant
  # AST helpers
  module AST

    # Find last node satisfying predicate (as block)
    #
    # @return [Parser::AST::Node]
    #   if satisfying node is found
    #
    # @yield [Parser::AST::Node]
    #
    # @yieldreturn [Boolean]
    #   true in case node satisfies predicate
    #
    # @return [nil]
    #   otherwise
    def self.find_last_path(node, &predicate)
      fail ArgumentError, 'block expected' unless block_given?
      path = []
      walk(node, [node]) do |candidate, stack|
        if predicate.call(candidate)
          path = stack.dup
        end
      end
      path
    end

    def self.walk(node, stack, &block)
      block.call(node, stack)
      node.children.grep(::Parser::AST::Node) do |child|
        stack.push(child)
        walk(child, stack, &block)
        stack.pop
      end
    end
    private_class_method :walk

  end # AST
end # Mutant

Version data entries

54 entries across 54 versions & 1 rubygems

Version	Path
mutant-0.11.13	lib/mutant/ast.rb
mutant-0.11.12	lib/mutant/ast.rb
mutant-0.11.11	lib/mutant/ast.rb
mutant-0.11.10	lib/mutant/ast.rb
mutant-0.11.9	lib/mutant/ast.rb
mutant-0.11.8	lib/mutant/ast.rb
mutant-0.11.7	lib/mutant/ast.rb
mutant-0.11.6	lib/mutant/ast.rb
mutant-0.11.5	lib/mutant/ast.rb
mutant-0.11.4	lib/mutant/ast.rb
mutant-0.11.3	lib/mutant/ast.rb
mutant-0.11.2	lib/mutant/ast.rb
mutant-0.11.1	lib/mutant/ast.rb
mutant-0.11.0	lib/mutant/ast.rb
mutant-0.10.35	lib/mutant/ast.rb
mutant-0.10.34	lib/mutant/ast.rb
mutant-0.10.33	lib/mutant/ast.rb
mutant-0.10.32	lib/mutant/ast.rb
mutant-0.10.31	lib/mutant/ast.rb
mutant-0.10.30	lib/mutant/ast.rb