Module: XmlSchema

Defined in:
lib/xml_schema.rb,
lib/xml_schema/version.rb

Constant Summary collapse

TYPES = 
%w(integer boolean float dateTime time date string decimal double duration gYearMonth gYear gMonthDay gDay gMonth hexBinary base64Binary anyURI QName NOTATION)
VERSION = 
"0.2.0"

Class Method Summary collapse

Class Method Details

.datatype_of(object) ⇒ Object

Obtain XML Schema datatype URI for a Ruby object.



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# File 'lib/xml_schema.rb', line 10

def self.datatype_of(object)
  #--
  # TODO: decimal, double, duration (Range?), gYearMonth, gYear, gMonthDay, gDay, gMonth, hexBinary, base64Binary, anyURI, QName, NOTATION
  #++
  case object.class.name
  when "Fixnum", "Integer"
    NS::XMLSchema['integer']
  when "TrueClass", "FalseClass"
    NS::XMLSchema['boolean']
  when "Float"
    NS::XMLSchema['float']
  when "DateTime"
    NS::XMLSchema['dateTime']
  when "Time"
    NS::XMLSchema['time']
  when "Date"
    NS::XMLSchema['date']
  when "String", "LocalizedString"
    NS::XMLSchema['string']
  else
    raise "#{object.class} cannot be coerced into any XMLSchema datatype"
  end
end

.instantiate(literal, datatype_uri = nil) ⇒ Object

Instantiate a Ruby object from a literal string and datatype URI. If datatype_uri is not specified, literal is interpreted as RDF typed literal (with datatype postfix).



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# File 'lib/xml_schema.rb', line 37

def self.instantiate(literal, datatype_uri = nil)
  # NOTE: removing language tag (e.g. "@en")
  lang_regexp = /@(\w+{2})$/
  lang = nil
  if literal =~ lang_regexp
    lang = $1
    # make a local copy of literal, with removed lang tag
    literal = literal.sub(lang_regexp, "")
  end
  
  full_literal = datatype_uri ? literal + "^^<#{datatype_uri}>" : literal
  literal_value, literal_type = full_literal.split('^^')
  datatype =
    if literal_type
      ns, l_type = literal_type.delete("<>").split('#')
      # TODO: somehow use a better comparison of URIs which ignores "/" at the end?
      if URI(ns.sub(/\/*$/, "/")) == NS::XMLSchema.uri && TYPES.include?(l_type)
        l_type
      else
        raise "Incompatible datatype URI! (#{ns})"
      end
    else
      'string'
    end

  # clean-up literal_value
  literal_value.sub!(/^["']/, '')
  literal_value.sub!(/["']$/, '')

  case datatype
  when 'integer'
    literal_value.to_i
  when 'boolean'
    %w(1 true).include?(literal_value)
  when 'dateTime'
    DateTime.parse(literal_value)
  when 'date'
    Date.parse(literal_value)
  when 'time'
    Time.parse(literal_value)
  when 'float'
    literal_value.to_f
  else
    if lang
      LocalizedString.new(literal_value, lang.to_sym)
    else
      # FIXME: fallback for unknown datatypes and 'string'
      literal_value
    end
  end
end