Class: Ruleby::Core::NotNode
Overview
This node class is used when a rule is looking for a fact that does not exist. It is a two-input node, and thus has some of the properties of the JoinNode. NOTE it has not clear how this will work if the NotPattern is declared as the first pattern in a rule.
Instance Attribute Summary
Attributes inherited from JoinNode
#ref_nodes
Attributes inherited from ParentNode
#child_nodes
Attributes inherited from Printable
#parent_nodes
Instance Method Summary
collapse
Methods inherited from JoinNode
#to_s
Methods inherited from ParentNode
#add_out_node, #assert, #forks?, #propagate_assert, #propagate_retract, #retract
Methods inherited from Node
#resolve
Methods inherited from Printable
#print
Constructor Details
Returns a new instance of NotNode.
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# File 'lib/core/nodes.rb', line 637
def initialize
super
end
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Instance Method Details
#assert_left(context) ⇒ Object
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# File 'lib/core/nodes.rb', line 665
def assert_left(context)
add_to_left_memory(context)
if @ref_nodes.empty? && @right_memory.empty?
propagate_assert(context)
else
propagate = true
@right_memory.values.each do |right_context|
if match_ref_nodes(context,right_context)
propagate = false
break
end
end
propagate_assert(context) if propagate
end
end
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#assert_right(context) ⇒ Object
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# File 'lib/core/nodes.rb', line 681
def assert_right(context)
@right_memory[context.fact.id] = context
if @ref_nodes.empty?
@left_memory.values.flatten.each do |left_context|
propagate_retract_resolve(left_context.match)
end
else
@left_memory.values.flatten.each do |left_context|
if match_ref_nodes(left_context,context)
propagate_retract_resolve(left_context.match)
end
end
end
end
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#retract_left(fact) ⇒ Object
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# File 'lib/core/nodes.rb', line 641
def retract_left(fact)
@left_memory.delete(fact.id)
propagate_retract(fact)
end
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#retract_right(fact) ⇒ Object
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# File 'lib/core/nodes.rb', line 646
def retract_right(fact)
right_context = @right_memory.delete(fact.id)
unless right_context == @right_memory.default
unless @ref_nodes.empty? && !@right_memory.empty?
@left_memory.values.each do |lm|
lm.each do |left_context|
if match_ref_nodes(left_context,right_context)
propagate_assert(left_context)
end
end
end
end
end
end
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