Class: KnowledgeBase::Traverser

Inherits:
Object
  • Object
show all
Defined in:
lib/rbbt/knowledge_base/traverse.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(kb, rules = []) ⇒ Traverser

Returns a new instance of Traverser.



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# File 'lib/rbbt/knowledge_base/traverse.rb', line 9

def initialize(kb, rules = [])
  @kb = kb
  @rules = rules
  @assignments = {}
  @matches = {}
end

Instance Attribute Details

#assignments ⇒ Object

Returns the value of attribute assignments.



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# File 'lib/rbbt/knowledge_base/traverse.rb', line 7

def assignments
  @assignments
end

#kb ⇒ Object

Returns the value of attribute kb.



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# File 'lib/rbbt/knowledge_base/traverse.rb', line 7

def kb
  @kb
end

#matches ⇒ Object

Returns the value of attribute matches.



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# File 'lib/rbbt/knowledge_base/traverse.rb', line 7

def matches
  @matches
end

#rules ⇒ Object

Returns the value of attribute rules.



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# File 'lib/rbbt/knowledge_base/traverse.rb', line 7

def rules
  @rules
end

Instance Method Details

#_ep(paths) ⇒ Object 



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# File 'lib/rbbt/knowledge_base/traverse.rb', line 105

def _ep(paths)
  found = []
  paths.each do |match,_next|
    case _next
    when TrueClass
      found << [match]
    when FalseClass
      next
    else
      _ep(_next).each do |_n|
        found << [match] + _n
      end
    end
  end
  found
end

#_fp(rules, clean_matches, assignments) ⇒ Object 



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# File 'lib/rbbt/knowledge_base/traverse.rb', line 71

def _fp(rules, clean_matches, assignments)
  return true if rules.empty?

  rule, *rest = rules
  source, db, target = rule.split /\s+/

  paths = {}
  matches = clean_matches[rule]
  Annotated.purge(matches).each do |match|
    new_assignments = nil
    match_source, _sep, match_target = match.partition "~"

    if is_wildcard? source
      next if assignments[source] and assignments[source]  != match_source
      new_assignments ||= assignments.dup
      new_assignments[source] = match_source
    end

    if is_wildcard? target
      next if assignments[target] and assignments[target]  != match_target
      new_assignments ||= assignments.dup
      new_assignments[target] = match_target
    end

    new_paths = _fp(rest, clean_matches, new_assignments)
    next unless new_paths
    paths[match] = new_paths
  end

  return false if paths.empty?

  paths 
end

#clean_matches(rules, all_matches, assignments) ⇒ Object 



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# File 'lib/rbbt/knowledge_base/traverse.rb', line 49

def clean_matches(rules, all_matches, assignments)
  paths = {}

  rules.zip(all_matches).each do |rule, matches|
    source, db, target = rule.split /\s+/

    if is_wildcard? source
      assigned = assignments[source]
      matches = matches.select{|m| assigned.include? m.source }
    end
    
    if is_wildcard? target
      assigned = assignments[target]
      matches = matches.select{|m| assigned.include? m.target }
    end

    paths[rule] = matches
  end

  paths
end

#find_paths(rules, all_matches, assignments) ⇒ Object 



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# File 'lib/rbbt/knowledge_base/traverse.rb', line 122

def find_paths(rules, all_matches, assignments)
  clean_matches = clean_matches(rules, all_matches, assignments)

  path_hash = _fp(rules, clean_matches, {})

  return [] unless path_hash
  _ep(path_hash).collect do |path|
    path.zip(clean_matches.values_at(*rules)).collect do |item, matches|
      matches.first.annotate item.dup
    end
  end
end

#identify(db, source, target) ⇒ Object 



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# File 'lib/rbbt/knowledge_base/traverse.rb', line 25

def identify(db, source, target)
  source_entities = if is_wildcard? source
                    assignments[source] || :all
                  else
                    kb.identify_source db, source
                  end

  target_entities = if is_wildcard? target
                      assignments[target] || :all
                    else
                      kb.identify_target db, target
                    end

  source_entities = [source_entities] unless Array === source_entities or source_entities == :all
  target_entities = [target_entities] unless Array === target_entities or target_entities == :all

  [source_entities, target_entities]
end

#is_wildcard?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rbbt/knowledge_base/traverse.rb', line 21

def is_wildcard?(name)
  name[0] == '?'
end

#reassign(matches, source, target) ⇒ Object 



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# File 'lib/rbbt/knowledge_base/traverse.rb', line 44

def reassign(matches, source, target)
  assignments[source] = (matches.any? ? matches.source.uniq : []) if is_wildcard? source
  assignments[target] = (matches.any? ? matches.target.uniq : []) if is_wildcard? target
end

#traverse ⇒ Object 



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# File 'lib/rbbt/knowledge_base/traverse.rb', line 136

def traverse
  all_matches = []

  rules.each do |rule|
    rule = rule.strip
    next if rule.empty?
    source, db, target, conditions = rule.match(/([^\s]+)\s+([^\s]+)\s+([^\s]+)(?:\s+-\s+([^\s]+))?/).captures

    source_entities, target_entities = identify db, source, target

    matches = kb.subset(db, :source => source_entities, :target => target_entities)

    if conditions
      conditions.split(/\s+/).each do |condition|
        if condition.index "="
          key, value = conditions.split("=")
          matches = matches.select{|m| m.info[key.strip].to_s =~ /\b#{value.strip}\b/}
        else
          matches = matches.select{|m| m.info[condition.strip].to_s =~ /\btrue\b/}
        end
      end
    end

    reassign matches, source, target

    all_matches << matches
  end

  paths = find_paths rules, all_matches, assignments
  
  [assignments, paths]
end

#wildcard(name) ⇒ Object 



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# File 'lib/rbbt/knowledge_base/traverse.rb', line 16

def wildcard(name)
  return name unless is_wildcard?(name)
  assignments[name] || name
end