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Contents
# frozen_string_literal: true
require_relative 'environment'
module MiniKraken
module Core
class CompositeGoal
# @return [Operator] The operator corresponding to this goal
attr_reader :operator
# @return [Array<Goal>] The child goals (sub-goals)
attr_reader :children
# @param anOperator [Operator] The operator corresponding to this goal
# @param theChildren [Array<Goal>] The child goals (sub-goals)
def initialize(anOperator, theChildren)
@operator = anOperator
@children = validated_children(theChildren)
end
# Attempt to achieve the goal for a given context (environment)
# @param anEnv [Environment] The context in which the goal take place.
# @return [Fiber<Outcome>] A Fiber object that will generate the results.
def attain(anEnv)
operator.solver_for(children, anEnv)
end
private
def validated_children(theChildren)
my_arity = operator.arity
if args.size != my_arity
err_msg = "Goal has #{theChildren.size} arguments, expected #{my_arity}"
raise StandardError, err_msg
end
prefix = 'Invalid goal argument '
theChildren.each do |subg|
raise StandardError, prefix + subg.to_s unless subg.kind_of?(Goal)
end
theChildren.dup
end
end # class
end # module
end # module
Version data entries
13 entries across 13 versions & 1 rubygems