Class: Wongi::Engine::DSL::Action::StatementGenerator

Inherits:
Base
  • Object
show all
Defined in:
lib/wongi-engine/dsl/action/statement_generator.rb

Instance Attribute Summary

Attributes inherited from Base

#name, #production, #rete, #rule

Instance Method Summary collapse

Methods included from CoreExt

included

Constructor Details

#initialize(template) ⇒ StatementGenerator

Returns a new instance of StatementGenerator.



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# File 'lib/wongi-engine/dsl/action/statement_generator.rb', line 5

def initialize template
  @template = template
end

Instance Method Details

#deexecute(token) ⇒ Object 



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# File 'lib/wongi-engine/dsl/action/statement_generator.rb', line 33

def deexecute token
  token.generated_wmes.reject( &:manual? ).inject( [] ) do |list, wme|
    list.tap do |l|
      wme.generating_tokens.delete token
      l << wme if wme.generating_tokens.empty?
    end
  end.each do |wme|
    rete.retract wme, automatic: true
  end
end

#execute(token) ⇒ Object 



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# File 'lib/wongi-engine/dsl/action/statement_generator.rb', line 9

def execute token
  subject, predicate, object = @template.resolve!(token)

  # link to rete here to ensure proper linking with token
  wme = WME.new subject, predicate, object, rete
  wme.manual = false

  production.tracer.trace( action: self, wme: wme ) if production.tracer
  if existing = rete.exists?( wme )
    generated = existing.generating_tokens.size
    if generated > 0 && ! token.generated_wmes.include?( existing )
      token.generated_wmes << existing
      existing.generating_tokens << token
    end
  else
    token.generated_wmes << wme
    wme.generating_tokens << token
    # this MUST be done after we link the wme and the token
    # in order for neg rule invalidation to work
    rete << wme
  end

end