Class: ActiveFacts::CQL::Compiler::Fact
- Inherits:
-
Definition
- Object
- Definition
- ActiveFacts::CQL::Compiler::Fact
- Defined in:
- lib/activefacts/cql/compiler/fact.rb
Instance Attribute Summary
Attributes inherited from Definition
#constellation, #tree, #vocabulary
Instance Method Summary collapse
-
#all_clauses(clauses) ⇒ Object
Occasionally we need to search through all the clauses.
-
#bind_clause(clause) ⇒ Object
Try to bind this clause, and return true if it can be completed.
- #bind_complete_fact(clause) ⇒ Object
-
#bind_entity_if_identifier_ready(clause, entity_type, binding) ⇒ Object
If we have one bare role (no literal or instance) played by an entity type, and the bound fact type participates in the identifier, we might now be able to create the entity instance.
- #bind_literal_or_fact_type(clause) ⇒ Object
-
#bind_more_facts ⇒ Object
Take one pass through the @unbound_clauses, processing (and removing) any that have all pre-requisites.
- #compile ⇒ Object
- #complain_incomplete ⇒ Object
- #entity_identified_by_literal(object_type, literal) ⇒ Object
-
#initialize(clauses, population_name = '') ⇒ Fact
constructor
A new instance of Fact.
- #instance_identified_by_literal(object_type, literal) ⇒ Object
- #to_s ⇒ Object
Methods inherited from Definition
#all_bindings_in_clauses, #build_all_steps, #build_step, #build_variables, #source
Constructor Details
#initialize(clauses, population_name = '') ⇒ Fact
Returns a new instance of Fact.
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# File 'lib/activefacts/cql/compiler/fact.rb', line 6 def initialize clauses, population_name = '' @clauses = clauses @population_name = population_name end |
Instance Method Details
#all_clauses(clauses) ⇒ Object
Occasionally we need to search through all the clauses. This builds a flat list
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# File 'lib/activefacts/cql/compiler/fact.rb', line 136 def all_clauses clauses clauses.map do |clause| [clause] + clause.refs.map{|vr| vr.nested_clauses ? all_clauses(vr.nested_clauses) : []} end.flatten.compact end |
#bind_clause(clause) ⇒ Object
Try to bind this clause, and return true if it can be completed
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# File 'lib/activefacts/cql/compiler/fact.rb', line 81 def bind_clause clause return true if clause.fact # Find the roles of this clause that do not yet have an instance = clause.refs. select do |ref| if !ref.binding.instance and ref.literal ref.binding.instance = instance_identified_by_literal(ref.binding.player, ref.literal) end next false if ref.binding.instance true end trace :instance_detail, "Considering '#{clause.display}' with "+ (.empty? ? "no bare roles" : "bare roles: #{.map{|ref| ref.player.name}*", "}") do # If all the roles are in place, we can bind the rest of this clause: return true if .size == 0 && bind_complete_fact(clause) progress = false if .size == 1 && (binding = [0].binding) && (et = binding.player).is_a?(ActiveFacts::Metamodel::EntityType) if et.preferred_identifier.role_sequence.all_role_ref.detect{|rr| rr.role.fact_type == clause.fact_type} && bind_entity_if_identifier_ready(clause, et, binding) progress = true end end return true if progress trace :instance_detail, "Delaying until all role players are asserted: #{clause.fact_type.default_reading.inspect}" nil end end |
#bind_complete_fact(clause) ⇒ Object
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# File 'lib/activefacts/cql/compiler/fact.rb', line 142 def bind_complete_fact clause return true unless clause.fact_type # An bare objectification instances = clause.refs.map{|vr| vr.binding.instance } trace :instance_detail, "All role players exist for #{clause.display.inspect} exist: #{instances.map{|i| "#{i.verbalise}"}*", "}" if e = clause.fact_type.entity_type and clause.refs[0].binding.instance.object_type == e fact = clause.refs[0].binding.instance.fact else # Check that this fact doesn't already exist trace :instance_detail, "Searching for existing fact instance" fact = clause.fact_type.all_fact.detect do |f| # Get the role values of this fact in the order of the clause we just bound role_values_in_clause_order = f.all_role_value.sort_by do |rv| clause.reading.role_sequence.all_role_ref.detect{|rr| rr.role == rv.role}.ordinal end # If all this fact's role values are played by the bound instances, it's the same fact !role_values_in_clause_order.zip(instances).detect{|rv, i| rv.instance != i } end end if fact clause.fact = fact trace :instance, "Already known: #{fact.verbalise.inspect}" else trace :instance_detail, "Asserting fact of type #{clause.fact_type.default_reading.inspect}" fact = clause.fact = @constellation.Fact(:new, :fact_type => clause.fact_type, :population => @population) @bound_facts << fact clause.reading.role_sequence.all_role_ref_in_order.zip(instances).each do |rr, instance| trace :instance_detail, "Assigning fact role #{instance.object_type.name} to #{instance.value ? instance.value.inspect : instance.verbalise}" # REVISIT: Any residual adjectives after the fact type matching are lost here. @constellation.RoleValue(:fact => fact, :instance => instance, :role => rr.role, :population => @population) end trace :instance, "Assert #{fact.verbalise.inspect} #{@population.name.size>0 ? " in "+@population.name.inspect : ''}" unless clause.fact_type.entity_type end if !fact.instance && clause.fact_type.entity_type # Objectified fact type; create the instance # Create the instance that objectifies this fact. We don't have the binding to assign it to though; that'll happen in our caller instance = @constellation.Instance(:new, :object_type => clause.fact_type.entity_type, :fact => fact, :population => @population) trace :instance, "Assert #{instance.verbalise.inspect}" @bound_facts << instance end if clause.fact and clause.objectified_as and instance = clause.fact.instance and instance.object_type == clause.objectified_as.binding.player clause.objectified_as.binding.instance = instance end true end |
#bind_entity_if_identifier_ready(clause, entity_type, binding) ⇒ Object
If we have one bare role (no literal or instance) played by an entity type, and the bound fact type participates in the identifier, we might now be able to create the entity instance.
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# File 'lib/activefacts/cql/compiler/fact.rb', line 204 def bind_entity_if_identifier_ready clause, entity_type, binding # Check this instance doesn't already exist already: = (clause.refs.map{|vr| vr.binding}-[binding])[0] return false unless # This happens when we have a bare objectification = .instance preferred_identifier = entity_type.preferred_identifier role_count = preferred_identifier.role_sequence.all_role_ref.size trace :instance, "A #{binding.player.name} is #{role_count > 1 ? 'partly ':''}identified in #{clause.inspect}" = preferred_identifier.role_sequence.all_role_ref.detect { |rr| rr.role.fact_type == clause.fact_type && rr.role.object_type == .player } unless # This should never happen; we already bound all refs trace :instance, "Failed to find a #{.object_type.name}" return false # We can't do this yet end role_value = .all_role_value.detect do |rv| rv.fact.fact_type == .role.fact_type end if role_value && role_count == 1 instance = (role_value.fact.all_role_value.to_a-[role_value])[0].instance trace :instance, "Existential fact already known: #{instance.verbalise.inspect}" binding.instance = instance return true # Done with this clause end pi_role_refs = preferred_identifier.role_sequence.all_role_ref # For each pi role, we have to find the fact clause, which contains the binding we need. # Then we have to create an instance of each fact identifiers = pi_role_refs.map do |rr| # Find a clause that provides the identifying_ref for this player: = all_clauses(@clauses).detect do |clause| rr.role.fact_type == clause.fact_type && clause.refs.detect{|vr| vr.binding == binding} end return false unless = .refs.select{|ref| ref.binding != binding}[0] = ? .binding : nil = .instance [rr, , , ] end if identifiers.detect{ |i| !i[3] } # Not all required facts are bound yet trace :instance, "Can't go through with creating #{binding.player.name}; not all the identifying facts are in" return false end instance = @constellation.Instance(:new, :object_type => entity_type, :population => @population) binding.instance = instance @bound_facts << instance identifiers.each do |rr, , , | # This clause provides the identifying literal for the entity_type id_fact = .fact = @constellation.Fact(:new, :fact_type => rr.role.fact_type, :population => @population) @bound_facts << id_fact role = (rr.role.fact_type.all_role.to_a-[rr.role])[0] @constellation.RoleValue(:instance => instance, :fact => id_fact, :population => @population, :role => role) @constellation.RoleValue(:instance => , :fact => id_fact, :role => rr.role, :population => @population) trace :instance, "Assert #{id_fact.verbalise.inspect} (existential) #{@population.name.size>0 ? " in "+@population.name.inspect : ''}" end trace :instance, "Assert #{instance.verbalise.inspect} #{@population.name.size>0 ? " in "+@population.name.inspect : ''}" true # Done with this clause end |
#bind_literal_or_fact_type(clause) ⇒ Object
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# File 'lib/activefacts/cql/compiler/fact.rb', line 44 def bind_literal_or_fact_type clause # Every bound word (term) in the phrases must have a literal # OR be bound to an entity type identified by the phrases # Any clause that has one binding and no other word is # either a value instance or a simply-identified entity. clause.refs.each do |ref| next unless l = ref.literal # No literal next if ref.binding.instance # Already bound player = ref.binding.player # raise "A literal may not be an objectification" if ref.role_ref.nested_clauses # raise "Not processing facts involving nested clauses yet" if ref.role_ref trace :instance_detail, "Making #{player.class.basename} #{player.name} using #{l.inspect}" do ref.binding.instance = instance_identified_by_literal(player, l) end ref end if clause.phrases.size == 1 and (ref = clause.phrases[0]).is_a?(Compiler::Reference) if ref.nested_clauses # Assign the objectified fact type as this clause's fact type? clause.fact_type = ref.player.fact_type clause else # This is an existential fact (like "Name 'foo'", or "Company 'Microsoft'") nil # Nothing to see here, move along end else raise "Fact Type not found: '#{clause.display}'" unless clause.fact_type # This instance will be associated with its binding by our caller clause end end |
#bind_more_facts ⇒ Object
Take one pass through the @unbound_clauses, processing (and removing) any that have all pre-requisites
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# File 'lib/activefacts/cql/compiler/fact.rb', line 118 def bind_more_facts return false unless @unbound_clauses.size > 0 @pass += 1 progress = false trace :instance_detail, "Pass #{@pass} with #{@unbound_clauses.size} clauses to consider" do @unbound_clauses = @unbound_clauses.select do |clause| action = bind_clause(clause) progress = true if action !action end trace :instance_detail, "end of pass, unbound clauses are #{@unbound_clauses.map(&:display)*', '}" end # debug progress end |
#compile ⇒ Object
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# File 'lib/activefacts/cql/compiler/fact.rb', line 11 def compile @population = @constellation.Population[[@vocabulary., @population_name]] || @constellation.Population(@vocabulary, @population_name, :concept => :new) @context = CompilationContext.new(@vocabulary) @context.bind @clauses @context.left_contraction_allowed = true @clauses.each do |clause| ft = clause.match_existing_fact_type @context if clause.certainty == false raise "Negated fact #{clause.inspect} is not supported" end end # Figure out the simple existential facts and find fact types: @bound_facts = [] @unbound_clauses = all_clauses(@clauses). map do |clause| bind_literal_or_fact_type clause end. compact # Because the fact types may include forward references, we must # process the list repeatedly until we make no further progress. @pass = 0 # Repeat until we make no more progress: true while bind_more_facts # Any remaining unbound facts are a problem we can bitch about: complain_incomplete unless @unbound_clauses.empty? @bound_facts.uniq # N.B. this includes Instance objects (existential facts) end |
#complain_incomplete ⇒ Object
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# File 'lib/activefacts/cql/compiler/fact.rb', line 345 def complain_incomplete if @unbound_clauses.size > 0 # Provide a readable description of the problem here, by showing each binding with no instance missing_bindings = @unbound_clauses. map do |clause| clause.refs. select do |refs| !refs.binding.instance end. map do |ref| ref.binding end end. flatten. uniq raise "Not enough facts are given to identify #{ missing_bindings. sort_by{|b| b.key}. map do |b| player_identifier = if b.player.is_a?(ActiveFacts::Metamodel::EntityType) "lacking " + b.player.preferred_identifier.role_sequence.all_role_ref.map do |rr| [ rr.leading_adjective, rr.role.role_name || rr.role.object_type.name, rr.trailing_adjective ].compact*" " end*", " else "needs a value" end [ b.refs[0].leading_adjective, b.player.name, b.refs[0].trailing_adjective ].compact*" " + " (#{player_identifier})" end*" or " }" end end |
#entity_identified_by_literal(object_type, literal) ⇒ Object
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# File 'lib/activefacts/cql/compiler/fact.rb', line 307 def entity_identified_by_literal object_type, literal # A literal that identifies an entity type means the entity type has only one identifying role # That role is played either by a value type, or by another similarly single-identified entity type trace :instance_detail, "Assert Entity #{object_type.name} identified by '#{literal}'" do = object_type.preferred_identifier.role_sequence.all_role_ref raise "Single literal cannot satisfy multiple identifying roles for #{object_type.name}" if .size > 1 role = .single.role # This instance has no binding; the binding is of the entity type not the identifying value type = instance_identified_by_literal role.object_type, literal existing_instance = nil instance_rv = .all_role_value.detect { |rv| next false unless rv.population == @population # Not this population next false unless rv.fact.fact_type == role.fact_type # Not this fact type other_role_value = (rv.fact.all_role_value-[rv])[0] existing_instance = other_role_value.instance other_role_value.instance.object_type == object_type # Is it this object_type? } if instance_rv instance = existing_instance trace :instance, "Already known: #{instance.verbalise.inspect}" else # This fact has no clause. trace :instance_detail, "Creating implicit existential fact #{role.fact_type.default_reading}" fact = @constellation.Fact(:new, :fact_type => role.fact_type, :population => @population) @bound_facts << fact # This instance will be associated with its binding by our caller instance = @constellation.Instance(:new, :object_type => object_type, :population => @population) trace :instance_detail, "Creating Entity #{object_type.name} identified by '#{literal}' #{@population.name.size>0 ? " in "+@population.name.inspect : ''}" @bound_facts << instance # The identifying fact type has two roles; create both role instances: @constellation.RoleValue(:instance => , :fact => fact, :population => @population, :role => role) @constellation.RoleValue(:instance => instance, :fact => fact, :population => @population, :role => (role.fact_type.all_role-[role])[0]) trace :instance, "Assert #{instance.verbalise.inspect}" end instance end end |
#instance_identified_by_literal(object_type, literal) ⇒ Object
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# File 'lib/activefacts/cql/compiler/fact.rb', line 273 def instance_identified_by_literal object_type, literal if object_type.is_a?(ActiveFacts::Metamodel::EntityType) entity_identified_by_literal object_type, literal else trace :instance_detail, "Assert Value #{object_type.name} #{literal.inspect}" do is_literal_string = literal.literal.is_a?(String) # REVISIT: Check for subtypes and supertypes also, and promote type if necessary instance = object_type.all_instance.detect do |i| #instance = @constellation.Instance.detect do |key, i| # REVISIT: And same unit trace :instance_detail2, "Comparing #{i.value.literal.inspect} to #{literal.literal.to_s.inspect}" i.population == @population && i.value && i.value.literal.inspect == literal.literal.to_s.inspect && i.value.is_literal_string == is_literal_string end #instance = object_type.all_instance.detect { |instance| # instance.population == @population && instance.value == literal #} if instance trace :instance, "Instance already known: #{instance.verbalise.inspect}" else instance = @constellation.Instance(:new) instance.object_type = object_type instance.population = @population instance.value = [literal.to_s, is_literal_string, nil] trace :instance, "Assert #{instance.verbalise.inspect} #{@population.name.size>0 ? " in "+@population.name.inspect : ''}" @bound_facts << instance end instance end end end |
#to_s ⇒ Object
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# File 'lib/activefacts/cql/compiler/fact.rb', line 383 def to_s super+@clauses.map(&:to_s)*', ' end |