Module: GRel::QL

Defined in:
lib/grel/ql.rb

Defined Under Namespace

Classes: BGP, Filter, QueryContext

Class Method Summary collapse

Class Method Details

.from_binding_hash(node) ⇒ Object

end of from_binding_value



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# File 'lib/grel/ql.rb', line 868

def self.from_binding_hash(node)
  node = node.raw_json if node.respond_to?(:raw_json)
  node.delete("@context")
  node = node.to_a.inject({}) do |ac, (p,v)|
    p = p[1..-1].to_sym if(p.index(":") == 0)
    p = p.split("#").last.to_sym if(p.index("#"))
    p = p.to_sym if(p == "@id" || p == "@type")
    v = from_binding_value(v)
    ac[p] = v; ac
  end
  node
end

.from_binding_to_id(obj) ⇒ Object 



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# File 'lib/grel/ql.rb', line 814

def self.from_binding_to_id(obj)
  if(!obj.is_a?(String))
    obj
  elsif(obj == "http://www.w3.org/1999/02/22-rdf-syntax-ns#nil")
    nil
  elsif(obj.index("http://grel.org/ids/id/"))
    val = URI.unescape(obj.split("http://grel.org/ids/id/").last)
    "@id(#{val})"
  elsif(obj.index("http://grel.org/ids/"))
    URI.unescape(obj.split("http://grel.org/ids/").last)
  elsif(obj.index("http://grel.org/vocabulary#"))
    obj.split("http://grel.org/vocabulary#").last.to_sym
  else
    obj
  end
end

.from_binding_value(obj) ⇒ Object 



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# File 'lib/grel/ql.rb', line 831

def self.from_binding_value(obj)
  if(obj.is_a?(Hash) && obj["@id"])
    from_binding_hash(obj)
  elsif(obj.is_a?(Hash) && obj["@type"])
    if(obj["@type"] == "http://www.w3.org/2001/XMLSchema#dateTime")
      Time.parse(obj["@value"])
    elsif(obj["@type"] == "http://www.w3.org/2001/XMLSchema#integer")
      obj["@value"].to_i
    elsif(obj["@type"] == "http://www.w3.org/2001/XMLSchema#float")
      obj["@value"].to_f
    elsif(obj["@type"] == "http://www.w3.org/2001/XMLSchema#boolean")
      (obj["@value"] == "true" ? true : false)
    else
      obj["@value"]
    end
  elsif(obj.is_a?(Hash) && obj["@value"])
    val = obj["@value"]
    if(val == "true")
      true
    elsif(val == "false")
      false
    elsif(val =~ /^\d+\.\d*$/)
      val.to_f
    elsif(val =~ /^d+$/)
      val.to_i
    elsif(val == "http://www.w3.org/1999/02/22-rdf-syntax-ns#nil")
      nil
    else
      val
    end
  elsif(obj.is_a?(Array))
    obj.map{|o| from_binding_value(o)}
  else
    from_binding_to_id(obj)
  end
end

.from_bindings_to_nodes(bindings, context, options = {}) ⇒ Object 



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# File 'lib/grel/ql.rb', line 881

def self.from_bindings_to_nodes(bindings,context, options = {})
  unlinked = options[:unlinked] || false
  nodes = {}
  uris = {}
  json = bindings
  json = [json] unless json.is_a?(Array)
  json.each do|node|
    node.each_pair do |k,v|
      # weird things happening with describe queries and arrays
      if(v.is_a?(Array))
        v = v.uniq
        v = v.first if v.length ==1
        node[k] = v
      end
    end

    node = from_binding_hash(node)
    nodes[node[:@id]] = node
    node.delete(:@id) unless node[:@id].index("@id(")
  end

  nodes.each do |(node_id,node)|       
    node.each_pair do |k,v|
      # weird things happening with describe queries and arrays
      if(v.is_a?(Array))
        v = v.uniq
        v = v.first if v.length ==1
        node[k] = v
      end

      if(v.is_a?(Hash) && v[:@id] && nodes[v[:@id]])
        node[k] = nodes[v[:@id]]
        nodes.delete(v[:@id]) if unlinked
      elsif(v.is_a?(Hash) && v[:@id])
        node[k] = from_binding_to_id(v[:@id])
      elsif(v.is_a?(Array))
        node[k] = v.map do |o|
          # recursive execution for each element in the array
          if(o.is_a?(Hash) && o[:@id] && nodes[o[:@id]])
            to_link = nodes[o[:@id]]
            nodes.delete(o[:@id]) if unlinked
            to_link
          elsif(o.is_a?(Hash) && o[:@id])
            from_binding_to_id(o[:@id])
          else
            o
          end
        end
      end
    end
  end

  nodes.values
end

.from_tuple_binding(tuple_value) ⇒ Object

end of to_query



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# File 'lib/grel/ql.rb', line 801

def self.from_tuple_binding(tuple_value)
  if(tuple_value["type"] == "uri")
    from_binding_to_id(tuple_value["value"])
  elsif(tuple_value["datatype"])
    tuple_value["@type"] = tuple_value["datatype"]
    tuple_value["@value"] = tuple_value["value"]
    from_binding_value(tuple_value)
  else
    tuple_value["@value"] = tuple_value["value"]
    from_binding_value(tuple_value)
  end
end

.to_id(obj) ⇒ Object 



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# File 'lib/grel/ql.rb', line 126

def self.to_id(obj)
  if(obj =~ ID_REGEX)
    "<http://grel.org/ids/id/#{URI.encode(ID_REGEX.match(obj)[1])}>"
  else
    "<http://grel.org/ids/#{URI.encode(obj)}>"
  end
end

.to_query(obj, context = QL::QueryContext.new, inverse = false) ⇒ Object

end of BGP



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# File 'lib/grel/ql.rb', line 743

def self.to_query(obj, context=QL::QueryContext.new, inverse=false)
  top_level = context.top_level
  context.top_level = false
  if(obj.is_a?(Symbol))
    if(obj == :@type)
      "rdf:type"
    elsif(obj == :@same_as)
      "<http://www.w3.org/2002/07/owl#sameAs>"
    elsif(obj.to_s.index("$inv_"))
      ":#{obj.to_s.split("$inv_").last}"
    elsif(obj.to_s == "_")
      "?X_#{obj.to_s.split('_').last}_#{context.next_node_id}"
    elsif(obj.to_s.index("_"))
      "?#{obj.to_s.split("_").drop(1).join("_")}"
    else
      ":#{obj}"
    end
  elsif(obj.is_a?(String))
    if(obj =~ ID_REGEX)
      QL.to_id(obj)
    else
      "\"#{obj}\""
    end
  elsif(obj.is_a?(Float))
    "\"#{obj}\"^^<http://www.w3.org/2001/XMLSchema#float>"
  elsif(obj.is_a?(Numeric))
    "\"#{obj}\"^^<http://www.w3.org/2001/XMLSchema#integer>"
  elsif(obj.is_a?(Time))
    "\"#{obj.iso8601}\"^^<http://www.w3.org/2001/XMLSchema#dateTime>"
  elsif(obj.is_a?(Date))
    "\"#{Time.new(obj.to_s).iso8601}\"^^<http://www.w3.org/2001/XMLSchema#dateTime>"
  elsif(obj.is_a?(Array))
    # TODO
  elsif(obj.is_a?(Hash))
    if(Filter.filter?(obj))
      filter = Filter.new(context)
      filter.parse(obj)
      filter
    else
      bgp = BGP.new(obj,context,inverse)
      next_triples = bgp.to_query
      # avoid patterns [?s1 ?p1 ?o1] where ?s1 is already linked in ?s0 ?p0 ?s1
      # they fail for SWRL rules in DESCRIBE queries
      unless(top_level == false && next_triples.length == 1 && 
             next_triples.first.reject{|c| c.index("?")==0 && c.index("_mg_") }.empty?)
        context.append(next_triples)
      end
      context
    end
  else
    if(obj.respond_to?(:to_query))
      obj.to_query(context)
    else
      "\"#{obj}\""
    end
  end
end

.to_rules(obj, context = {}) ⇒ Object 



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# File 'lib/grel/ql.rb', line 4

def self.to_rules(obj,context={})
  if(obj.is_a?(String) && obj[0..0] == "?")
    var_name = obj[1..-1]
    axiom = "<swrl:Variable rdf:about=\"http://www.w3.org/2003/11/swrl##{obj[1..-1]}\"></swrl:Variable>"
    context[var_name] = axiom
    "http://www.w3.org/2003/11/swrl##{obj[1..-1]}"
  elsif(obj.is_a?(Symbol))
    "##{obj}"
  elsif(obj.is_a?(Array))
    if(obj.first.is_a?(Symbol))
      elem = obj.first
      if(elem.to_s[0] == "$")
        pred = case elem
               when :$lt
                 "<swrl:BuiltinAtom><swrl:builtin rdf:resource=\"http://www.w3.org/2003/11/swrlb#lessThan\"/><swrl:arguments ><rdf:List>ARGS</rdf:List></swrl:arguments></swrl:BuiltinAtom>"
               when :$gt
                 "<swrl:BuiltinAtom><swrl:builtin rdf:resource=\"http://www.w3.org/2003/11/swrlb#greaterThan\"/><swrl:arguments ><rdf:List>ARGS</rdf:List></swrl:arguments></swrl:BuiltinAtom>"
               when :$lte
                 "<swrl:BuiltinAtom><swrl:builtin rdf:resource=\"http://www.w3.org/2003/11/swrlb#lessThanOrEqual\"/><swrl:arguments ><rdf:List>ARGS</rdf:List></swrl:arguments></swrl:BuiltinAtom>"              
               when :$gte
                 "<swrl:BuiltinAtom><swrl:builtin rdf:resource=\"http://www.w3.org/2003/11/swrlb#greaterThanOrEqual\"/><swrl:arguments ><rdf:List>ARGS</rdf:List></swrl:arguments></swrl:BuiltinAtom>"              
               when :$eq
                 "<swrl:BuiltinAtom><swrl:builtin rdf:resource=\"http://www.w3.org/2003/11/swrlb#equal\"/><swrl:arguments ><rdf:List>ARGS</rdf:List></swrl:arguments></swrl:BuiltinAtom>"              
               when :$neq
                 "<swrl:BuiltinAtom><swrl:builtin rdf:resource=\"http://www.w3.org/2003/11/swrlb#notEqual\"/><swrl:arguments ><rdf:List>ARGS</rdf:List></swrl:arguments></swrl:BuiltinAtom>"              
               end

        args = []
        
        if(obj[1].is_a?(String) && obj[1][0] == "?")
          args << "<rdf:first rdf:resource=\"#{GRel::QL.to_rules(obj[1], context)}\" />"
        else
          args << GRel::QL.to_rules(obj[1],context).gsub("swrl:argumentn","rdf:first")
        end

        if(obj[2].is_a?(String) && obj[2][0] == "?")
          args << "<rdf:rest><rdf:List><rdf:first rdf:resource=\"#{GRel::QL.to_rules(obj[2],context)}\"/><rdf:rest rdf:resource=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#nil\"/></rdf:List></rdf:rest>"
        else
          args << "<rdf:rest><rdf:List>#{GRel::QL.to_rules(obj[2],context).gsub("swrl:argumentn","rdf:first")}<rdf:rest rdf:resource=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#nil\"/></rdf:List></rdf:rest>"
        end

        pred.gsub(">ARGS<",">#{args.join}<")
      elsif(elem.to_s.capitalize == elem.to_s)  # is a class atom
        pred = "<swrl:classAtom><swrl:classPredicate rdf:resource=\"#{GRel::QL.to_rules(elem,context)}\" />"
        pred += "<swrl:argument1 rdf:resource=\"#{GRel::QL.to_rules(obj[1],context)}\" />"
        pred + "</swrl:classAtom>"
      elsif(elem.to_s.capitalize != elem.to_s) # is a property axiom
        is_data = obj[1..-1].detect{|e| !e.is_a?(String) || ( e.is_a?(String) && e[0] != "?" && e.index("@id") != 0 ) }
        if(is_data) # data property
          pred = "<swrl:DatavaluedPropertyAtom>"
          pred += "<swrl:propertyPredicate rdf:resource=\"http://grel.org/vocabulary#{GRel::QL.to_rules(elem,context)}\"/>"
          if(obj[1].is_a?(String) && (obj[1][0] == "?" || obj[1].index("@id")==0))
            pred += "<swrl:argument1 rdf:resource=\"#{GRel::QL.to_rules(obj[1], context)}\" />"
          else
            pred +=  GRel::QL.to_rules(obj[1], context).gsub("argumentn","argument1")
          end
          if(obj[2].is_a?(String) && (obj[2][0] == "?" || obj[2].index("@id")==0))
            pred += "<swrl:argument1 rdf:resource=\"#{GRel::QL.to_rules(obj[2], context)}\" />"
          else
            pred +=  GRel::QL.to_rules(obj[2], context).gsub("argumentn","argument2")               
          end
          pred + "</swrl:DatavaluedPropertyAtom>"
        else # individual property
          pred = "<swrl:IndividualPropertyAtom>"
          pred += "<swrl:propertyPredicate rdf:resource=\"http://grel.org/vocabulary#{GRel::QL.to_rules(elem,context)}\"/>"
          pred += "<swrl:argument1 rdf:resource=\"#{GRel::QL.to_rules(obj[1],context)}\" />"
          pred += "<swrl:argument2 rdf:resource=\"#{GRel::QL.to_rules(obj[2],context)}\" />"
          pred + "</swrl:IndividualPropertyAtom>"
          is_object = obj[1..-1].detect{|e| !e.is_a?(String) && ( e.is_a?(String) && e.index("@id") != 0 ) }
          unless(is_object)               
            pred = "<swrl:DatavaluedPropertyAtom>"
            pred += "<swrl:propertyPredicate rdf:resource=\"http://grel.org/vocabulary#{GRel::QL.to_rules(elem,context)}\"/>"
            pred += "<swrl:argument1 rdf:resource=\"#{GRel::QL.to_rules(obj[1],context)}\" />"
            pred += "<swrl:argument2 rdf:resource=\"#{GRel::QL.to_rules(obj[2],context)}\" />"
            pred + "</swrl:DatavaluedPropertyAtom>"
          end
        end
      else
        raise Exception.new("Unkown rule axiom #{obj.inspect}")
      end
    elsif(obj.first.is_a?(Array))
      obj.map{|ax| GRel::QL.to_rules(ax,context)}.join("")
    else
      raise Exception.new("Unkown rule axiom #{obj.inspect}")
    end
  elsif(obj.is_a?(String) && obj.index("@id")==0) # is a IRI
    GRel::QL::to_id(obj).gsub("<","").gsub(">","")
  elsif(obj.is_a?(String)) # is a IRI
    "<swrl:argumentn rdf:datatype=\"http://www.w3.org/2001/XMLSchema#string\">#{obj}</swrl:argumentn>"
  elsif(obj == true || obj == false)
    "<swrl:argumentn rdf:datatype=\"http://www.w3.org/2001/XMLSchema#boolean\">#{obj}</swrl:argumentn>"
  elsif(obj.is_a?(Float))
    "<swrl:argumentn rdf:datatype=\"http://www.w3.org/2001/XMLSchema#float\">#{obj}</swrl:argumentn>"
  elsif(obj.is_a?(Numeric))
    "<swrl:argumentn rdf:datatype=\"http://www.w3.org/2001/XMLSchema#integer\">#{obj}</swrl:argumentn>"
  elsif(obj.is_a?(Time))
    "<swrl:argumentn rdf:datatype=\"http://www.w3.org/2001/XMLSchema#dateTime\">#{obj.iso8601}</swrl:argumentn>"
  elsif(obj.is_a?(Date))
    "<swrl:argumentn rdf:datatype=\"http://www.w3.org/2001/XMLSchema#dateTime\">#{Time.new(obj.to_s).iso8601}</swrl:argumentn>"
  # Building the document here
  elsif(obj.is_a?(Hash))
    rules = obj.map do |(body,head)|
      "<swrl:Imp><swrl:body rdf:parseType=\"Collection\">#{GRel::QL.to_rules(body,context)}</swrl:body ><swrl:head rdf:parseType=\"Collection\">#{GRel::QL.to_rules(head,context)}</swrl:head></swrl:Imp>"
    end.join("")
    doc = "<rdf:RDF xml:base=\"#{GRel::NAMESPACE}\" xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\" xmlns:owl=\"http://www.w3.org/2002/07/owl#\" xmlns:swrl=\"http://www.w3.org/2003/11/swrl#\" xmlns:ruleml=\"http://www.w3.org/2003/11/swrl\">"
    doc += context.values.join("")
    doc += rules
    doc + "</rdf:RDF>"
  else
    raise Exception.new("Unkown rule axiom #{obj.inspect}")        
  end
end

.to_triples(obj) ⇒ Object 



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# File 'lib/grel/ql.rb', line 141

def self.to_triples(obj)
  if(obj.is_a?(BlankId))
    obj.to_s
  elsif(obj.is_a?(Symbol))
    if(obj == :@type)
      "rdf:type"
    elsif(obj == :@subclass)
      "rdfs:subClassOf"
    elsif(obj == :@subproperty)
      "rdfs:subPropertyOf"
    elsif(obj == :@domain)
      "rdfs:domain"
    elsif(obj == :@range)
      "rdfs:range"
    elsif(obj == :@same_as)
      "<http://www.w3.org/2002/07/owl#sameAs>"
    elsif(obj == :@functional)
      "<http://www.w3.org/2002/07/owl#FunctionalProperty>"
    elsif(obj == :"<http://www.w3.org/2002/07/owl#FunctionalProperty>")
      "<http://www.w3.org/2002/07/owl#FunctionalProperty>"
    elsif(obj == :"<http://www.w3.org/2002/07/owl#sameAs>")
      "<http://www.w3.org/2002/07/owl#sameAs>"
    elsif(obj == :"<http://www.w3.org/2002/07/owl#onClass>")
      "<http://www.w3.org/2002/07/owl#onClass>"
    elsif(obj == :"<http://www.w3.org/2002/07/owl#qualifiedCardinality>")
      "<http://www.w3.org/2002/07/owl#qualifiedCardinality>"
    elsif(obj == :"<http://www.w3.org/2002/07/owl#minCardinality>")
      "<http://www.w3.org/2002/07/owl#minCardinality>"
    elsif(obj == :"<http://www.w3.org/2002/07/owl#maxCardinality>")
      "<http://www.w3.org/2002/07/owl#maxCardinality>"
    elsif(obj == :"<http://www.w3.org/2002/07/owl#minQualifiedCardinality>")
      "<http://www.w3.org/2002/07/owl#minQualifiedCardinality>"
    elsif(obj == :"<http://www.w3.org/2002/07/owl#maxQualifiedCardinality>")
      "<http://www.w3.org/2002/07/owl#maxQualifiedCardinality>"
    elsif(obj == :"<http://www.w3.org/2002/07/owl#cardinality>")
      "<http://www.w3.org/2002/07/owl#cardinality>"
    elsif(obj == :@some)
      "<http://www.w3.org/2002/07/owl#someValuesFrom>"
    elsif(obj == :@all)
      "<http://www.w3.org/2002/07/owl#allValuesFrom>"
    elsif(obj == :"<http://www.w3.org/2002/07/owl#Restriction>")
      "<http://www.w3.org/2002/07/owl#Restriction>"
    elsif(obj == :"<http://www.w3.org/2002/07/owl#onProperty>")
      "<http://www.w3.org/2002/07/owl#onProperty>"
    elsif(obj == :"<http://www.w3.org/2002/07/owl#DatatypeProperty>")
      "<http://www.w3.org/2002/07/owl#DatatypeProperty>"
    elsif(obj == :"<http://www.w3.org/2002/07/owl#ObjectProperty>")
      "<http://www.w3.org/2002/07/owl#ObjectProperty>"
    else
      ":#{obj}"
    end
  elsif(obj.is_a?(String))
    if(obj =~ ID_REGEX)
      QL.to_id(obj)
    else
      "\"#{obj}\""
    end
  elsif(obj == nil)
    NIL
  elsif(obj == Float)
    "<http://www.w3.org/2001/XMLSchema#float>"
  elsif(obj == Numeric || obj == Fixnum || obj == "Bignum")
    "<http://www.w3.org/2001/XMLSchema#integer>"
  elsif(obj == Time || obj == Date || obj == DateTime)
    "<http://www.w3.org/2001/XMLSchema#dateTime>"
  elsif(obj == TrueClass || obj == FalseClass)
    "<http://www.w3.org/2001/XMLSchema#boolean>"
  elsif(obj.is_a?(NonNegativeInteger))
    obj.to_s
  elsif(obj == true || obj == false)
    "\"#{obj}\"^^<http://www.w3.org/2001/XMLSchema#boolean>"
  elsif(obj.is_a?(Float))
    "\"#{obj}\"^^<http://www.w3.org/2001/XMLSchema#float>"
  elsif(obj.is_a?(Numeric))
    "\"#{obj}\"^^<http://www.w3.org/2001/XMLSchema#integer>"
  elsif(obj.is_a?(Time))
    "\"#{obj.iso8601}\"^^<http://www.w3.org/2001/XMLSchema#dateTime>"
  elsif(obj.is_a?(Date))
    "\"#{Time.new(obj.to_s).iso8601}\"^^<http://www.w3.org/2001/XMLSchema#dateTime>"
  elsif(obj.is_a?(Array)) # top level array, not array property in a hash
    if(obj.detect{|e| e.is_a?(Hash) || e.respond_to?(:to_triples) })
      obj.map{|e| QL.to_triples(e) }.inject([]){|a,i| a += i}
    else
      obj.each_slice(3).map do |s|
        s.map{|e| QL.to_triples(e) }
      end
    end
  elsif(obj.is_a?(Hash))
    # no blank nodes
    obj[:@id] = "@id(#{SecureRandom.hex})" if obj[:@id].nil?
    # normalising id values
    obj[:@id] = "@id(#{obj[:@id]})" if obj[:@id].index("@id(").nil?

    acum = []
    triples_acum = []
    triples_nested = []
    id = nil
    obj.each_pair do |k,v|
      p = QL.to_triples(k)
      if(v.is_a?(Hash))
        next_triples = QL.to_triples(v)
        triples_acum += next_triples
        v = next_triples.triples_id
        acum << [p,v] if v && k != :@id
      elsif(v.is_a?(Array)) # array as a property in a hash
        v.map{|o| QL.to_triples(o) }.each do |o|
          if(o.is_a?(Array) || o.respond_to?(:triples_id))
            acum << [p, o.triples_id]
            triples_nested += o
          else
            acum << [p, o]
          end
        end
      else
        if(k == :@id) 
          id = QL.to_triples(v)
        else
          v = QL.to_triples(v)
        end
        acum << [p,v] if v && k != :@id
      end
    end

    id = id || BlankId.new

    triples_acum = triples_acum + acum.map{|(p,o)| [id, p, o] } + triples_nested
    triples_acum.triples_id = id
    triples_acum
  else
    if(obj.respond_to?(:to_triples))
      obj.to_triples
    else
      "\"#{obj}\""
    end
  end
end

.to_turtle(obj, schema = false) ⇒ Object 



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# File 'lib/grel/ql.rb', line 134

def self.to_turtle(obj, schema=false)
  data = "@prefix : <http://grel.org/vocabulary#> . @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . "
  data = data + "@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . " if schema

  data + QL.to_triples(obj).map{|t| t.map(&:to_s).join(" ") }.join(" .\n ") + " ."
end

.unlink_sparql_query(ids) ⇒ Object 



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# File 'lib/grel/ql.rb', line 117

def self.unlink_sparql_query(ids)
  conditions = ids.map do |id|
    id = "@id(#{id})" if id && id.is_a?(String) && id.index("@id(").nil?        
    id = QL.to_query(id)
    "(?S = #{id} && isIRI(?O) && ?P != <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>) || ?O = #{id}"
  end
  "SELECT ?S ?P ?O WHERE { ?S ?P ?O . FILTER (#{conditions.join(' || ')}) } "
end