Class: Ruleby::Core::WorkingMemory

Inherits:
Object
  • Object
show all
Defined in:
lib/core/engine.rb

Overview

The working memory is a container for all the facts in the system. The inference engine will compare these facts with the rules to produce some outcomes.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ WorkingMemory

Returns a new instance of WorkingMemory.



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# File 'lib/core/engine.rb', line 140

def initialize
  @recency = 0
  @facts = Array.new
end

Instance Attribute Details

#facts ⇒ Object (readonly)

Returns the value of attribute facts.



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# File 'lib/core/engine.rb', line 138

def facts
  @facts
end

Instance Method Details

#assert_fact(fact) ⇒ Object 



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# File 'lib/core/engine.rb', line 151

def assert_fact(fact)
  raise 'The fact asserted cannot be nil!' unless fact.object
  if (fact.token == :plus)
    fact.recency = @recency
    @recency += 1
    @facts.push fact
    return fact
  else #if (fact.token == :minus)  
    i = @facts.index(fact)
    raise 'The fact to remove does not exist!' unless i
    existing_fact = @facts[i]
    @facts.delete_at(i)
    existing_fact.token = fact.token
    return existing_fact
  end
end

#each_fact ⇒ Object 



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# File 'lib/core/engine.rb', line 145

def each_fact
  @facts.each do |f|
    yield(f)
  end
end

#print ⇒ Object 



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# File 'lib/core/engine.rb', line 168

def print
  puts 'WORKING MEMORY:'
  @facts.each do |fact|
    puts " #{fact.object} - #{fact.id} - #{fact.recency}"
  end
end