Class: Musa::Rules::Rules

Inherits:
Object
  • Object
show all
Includes:
Extension::With
Defined in:
lib/musa-dsl/generative/rules.rb

Instance Method Summary collapse

Methods included from Extension::With

#with

Constructor Details

#initialize(&block) ⇒ Rules

Returns a new instance of Rules.



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# File 'lib/musa-dsl/generative/rules.rb', line 15

def initialize(&block)
  @dsl = RulesEvalContext.new(&block)
end

Instance Method Details

#apply(object_or_list, node = nil, **parameters) ⇒ Object 



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# File 'lib/musa-dsl/generative/rules.rb', line 56

def apply(object_or_list, node = nil, **parameters)
  list = object_or_list.arrayfy.clone

  node ||= Node.new

  seed = list.shift

  if seed
    result = generate_possibilities seed, node, **parameters

    fished = result.fish

    node.reject! 'All children are rejected' if fished.empty?

    fished.each do |object|
      subnode = node.add(object).mark_as_ended!
      apply list, subnode, **parameters
    end
  end

  node
end

#generate_possibilities(object, confirmed_node = nil, node = nil, grow_rules = nil, **parameters) ⇒ Object 



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# File 'lib/musa-dsl/generative/rules.rb', line 19

def generate_possibilities(object, confirmed_node = nil, node = nil, grow_rules = nil, **parameters)
  node ||= Node.new
  grow_rules ||= @dsl._grow_rules

  history = confirmed_node.history if confirmed_node
  history ||= []

  grow_rules = grow_rules.clone
  grow_rule = grow_rules.shift

  if grow_rule
    grow_rule.generate_possibilities(object, history, **parameters).each do |new_object|
      new_node = Node.new new_object, node
      if @dsl._has_ending? && @dsl._ended?(new_object, history, **parameters) ||
        !@dsl._has_ending? && grow_rules.empty?

        new_node.mark_as_ended!
      end

      rejection = @dsl._cut_rules.find { |cut_rule| cut_rule.rejects?(new_object, history, **parameters) }
      # TODO: include rejection secondary reasons in rejection message

      new_node.reject! rejection if rejection

      node.children << new_node
    end
  end

  unless grow_rules.empty?
    node.children.each do |node|
      generate_possibilities node.object, confirmed_node, node, grow_rules, **parameters unless node.rejected || node.ended?
    end
  end

  node
end