Class: ActiveFacts::CQL::Compiler::Constraint

Inherits:
Definition
  • Object
show all
Defined in:
lib/activefacts/cql/compiler/constraint.rb

Instance Attribute Summary

Attributes inherited from Definition

#constellation, #source, #vocabulary

Instance Method Summary collapse

Constructor Details

#initialize(context_note, enforcement, readings_lists = []) ⇒ Constraint

Returns a new instance of Constraint.



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# File 'lib/activefacts/cql/compiler/constraint.rb', line 55

def initialize context_note, enforcement, readings_lists = []
  @context_note = context_note
  @enforcement = enforcement
  @readings_lists = readings_lists
end

Instance Method Details

#all_bindings_in_readings(readings) ⇒ Object

Return the unique array of all bindings in these readings, including in objectification joins



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# File 'lib/activefacts/cql/compiler/constraint.rb', line 71

def all_bindings_in_readings readings
  readings.map do |reading|
    reading.role_refs.map do |rr|
      [rr.binding] + (rr.objectification_join ? all_bindings_in_readings(rr.objectification_join) : [])
    end
  end.
    flatten.
    uniq
end

#bind_readings ⇒ Object 



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# File 'lib/activefacts/cql/compiler/constraint.rb', line 81

def bind_readings
  @context = CompilationContext.new(@vocabulary)

  @readings_lists.map do |readings_list|
    readings_list.each{ |reading| reading.identify_players_with_role_name(@context) }
    readings_list.each{ |reading| reading.identify_other_players(@context) }
    readings_list.each{ |reading| reading.bind_roles @context }  # Create the Compiler::Bindings
    readings_list.each do |reading| 
      fact_type = reading.match_existing_fact_type @context
      raise "Unrecognised fact type #{reading.inspect} in #{self.class}" unless fact_type
    end
  end

  loose_binding

  # Ok, we have bound all players by subscript/role_name, by adjectives, and by loose binding,
  # and matched all the fact types that matter. Now assemble a join (with all join steps) for
  # each join list, and build an array of the bindings that are involved in the join steps.
  @bindings_by_list =
    @readings_lists.map do |readings_list|
      all_bindings_in_readings(readings_list)
    end

  warn_ignored_joins
end

#common_bindings ⇒ Object 



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# File 'lib/activefacts/cql/compiler/constraint.rb', line 185

def common_bindings
  @common_bindings ||= @bindings_by_list[1..-1].inject(@bindings_by_list[0]) { |r, b| r & b }
  raise "#{self.class} must cover some of the same roles, see #{@bindings_by_list.inspect}" unless @common_bindings.size > 0
  @common_bindings
end

#compile ⇒ Object 



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# File 'lib/activefacts/cql/compiler/constraint.rb', line 61

def compile
  @context_note.compile @constellation, @constraint if @context_note
  @constraint
end

#loose_bind_roles ⇒ Object 



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# File 'lib/activefacts/cql/compiler/constraint.rb', line 150

def loose_bind_roles
  # Apply loose binding over applicable @roles:
  debug :binding, "Check for loose bindings on #{@roles.size} roles in #{self.class.name}" do
    @roles.each do |role_ref|
      role_ref.identify_player @context
      role_ref.bind @context
      if role_ref.binding.refs.size < @readings_lists.size+1
        debug :binding, "Insufficient bindings for #{role_ref.inspect} (#{role_ref.binding.refs.size}, expected #{@readings_lists.size+1}), attempting loose binding" do
          @readings_lists.each do |readings_list|
            candidates = []
            next if readings_list.
              detect do |reading|
                debug :binding, "Checking #{reading.inspect}"
                reading.role_refs.
                  detect do |rr|
                    already_bound = rr.binding == role_ref.binding
                    if !already_bound && rr.player == role_ref.player
                      candidates << rr
                    end
                    already_bound
                  end
              end
            debug :binding, "Attempting loose binding for #{role_ref.inspect} in #{readings_list.inspect}, from the following candidates: #{candidates.inspect}"

            if candidates.size == 1
              debug :binding, "Rebinding #{candidates[0].inspect} to #{role_ref.inspect}"
              candidates[0].rebind_to(@context, role_ref)
            end
          end
        end
      end
    end
  end
end

#loose_bind_wherever_possible ⇒ Object 



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# File 'lib/activefacts/cql/compiler/constraint.rb', line 117

def loose_bind_wherever_possible
  # Apply loose binding over applicable roles:
  debug :binding, "Loose binding on #{self.class.name}" do
    @readings_lists.each do |readings_list|
      readings_list.each do |reading|
        reading.role_refs.each_with_index do |role_ref, i|
          next if role_ref.binding.refs.size > 1
#                  if reading.side_effects && !reading.side_effects.role_side_effects[i].residual_adjectives
#                    debug :binding, "Discounting #{role_ref.inspect} as needing loose binding because it has no residual_adjectives"
#                    next
#                  end
          # This role_ref didn't match any other role_ref. Have a scout around for a suitable partner
          candidates = @context.bindings.
            select do |key, binding|
              binding.player == role_ref.binding.player and
                binding != role_ref.binding and
                binding.role_name == role_ref.binding.role_name and  # Both will be nil if they match
                # REVISIT: Don't bind to a binding with a role occurrence in the same reading
                !binding.refs.detect{|rr|
                  x = rr.reading == reading
                  # puts "Discounting binding #{binding.inspect} as a match for #{role_ref.inspect} because it's already bound to a player in #{role_ref.reading.inspect}" if x
                  x
                }
            end.map{|k,b| b}
          next if candidates.size != 1  # Fail
          debug :binding, "Loose binding #{role_ref.inspect} to #{candidates[0].inspect}"
          role_ref.rebind_to(@context, candidates[0].refs[0])
        end
      end
    end
  end
end

#loose_binding ⇒ Object 



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# File 'lib/activefacts/cql/compiler/constraint.rb', line 66

def loose_binding
  # Override for constraint types that need loose binding (same role player matching with different adjectives)
end

#warn_ignored_joins ⇒ Object 



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# File 'lib/activefacts/cql/compiler/constraint.rb', line 107

def warn_ignored_joins
  # Warn about ignored joins
  @readings_lists.each do |readings_list|
    fact_types = readings_list.map{|join| join.role_refs[0].role_ref.role.fact_type}.uniq
    if fact_types.size > 1
      puts "------->>>> Join ignored in #{self.class}: #{fact_types.map{|ft| ft.preferred_reading.expand}*' and '}"
    end
  end
end