Module: Atom::Xml::Parseable

Included in:
Category, Content::Base, Entry, Feed, Generator, Link, Person, Pub::Categories, Pub::Collection, Pub::Service, Pub::Workspace, Source
Defined in:
lib/atom/xml/parser.rb

Overview

:nodoc:

Defined Under Namespace

Modules: DeclarationMethods Classes: ParseSpec

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(o) ⇒ Object 



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# File 'lib/atom/xml/parser.rb', line 129

def Parseable.included(o)
  o.class_eval do
    def o.ordered_element_specs;  @ordered_element_specs ||= []; end
    def o.element_specs;  @element_specs ||= {}; end
    def o.attributes; @attributes ||= []; end
    def o.uri_attributes; @uri_attributes ||= []; end
    def element_specs; self.class.element_specs; end
    def ordered_element_specs; self.class.ordered_element_specs; end
    def attributes; self.class.attributes; end
    def uri_attributes; self.class.uri_attributes; end
    def o.namespace(ns = @namespace); @namespace = ns; end
    def o.add_extension_namespace(ns, url); self.extensions_namespaces[ns.to_s] = url; end
    def o.extensions_namespaces; @extensions_namespaces ||= {} end
    def o.known_namespaces; @known_namespaces ||= [] end
  end
  o.send(:extend, DeclarationMethods)
end

Instance Method Details

#==(o) ⇒ Object 



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# File 'lib/atom/xml/parser.rb', line 147

def ==(o)
  if self.object_id == o.object_id
    true
  elsif o.instance_of?(self.class)
    self.class.element_specs.values.all? do |spec|
      self.send(spec.attribute) == o.send(spec.attribute)
    end
  else
    false
  end
end

#accessor_name(name) ⇒ Object 



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# File 'lib/atom/xml/parser.rb', line 125

def accessor_name(name)
  Atom.to_attrname(name)
end

#current_node_is?(xml, element, ns = nil) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/atom/xml/parser.rb', line 121

def current_node_is?(xml, element, ns = nil)
  xml.node_type == XML::Reader::TYPE_ELEMENT && xml.local_name == element && (ns.nil? || ns == xml.namespace_uri)
end

#next_node_is?(xml, element, ns = nil) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/atom/xml/parser.rb', line 115

def next_node_is?(xml, element, ns = nil)
  # Get to the next element
  while xml.next == 1 && xml.node_type != XML::Reader::TYPE_ELEMENT; end
  current_node_is?(xml, element, ns)
end

#parse(xml, options = {}) ⇒ Object 



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# File 'lib/atom/xml/parser.rb', line 81

def parse(xml, options = {})
  starting_depth = xml.depth
  loop do
    case xml.node_type
    when XML::Reader::TYPE_ELEMENT
      if element_specs.include?(xml.local_name) && (self.class.known_namespaces + [Atom::NAMESPACE, Atom::Pub::NAMESPACE]).include?(xml.namespace_uri)
        element_specs[xml.local_name].parse(self, xml)
      elsif attributes.any? || uri_attributes.any?
        while (xml.move_to_next_attribute == 1)
          if attributes.include?(xml.name)
            # Support attribute names with namespace prefixes
            self.send("#{accessor_name(xml.name)}=", xml.value)
          elsif uri_attributes.include?(xml.name)
            value = if xml.base_uri
              @base_uri = xml.base_uri
              raw_uri = URI.parse(xml.value)
              (raw_uri.relative? ? URI.parse(xml.base_uri) + raw_uri : raw_uri).to_s
            else
              xml.value
            end
            self.send("#{accessor_name(xml.name)}=", value)
          elsif self.respond_to?(:simple_extensions)
            self[xml.namespace_uri, xml.local_name].as_attribute = true
            self[xml.namespace_uri, xml.local_name] << xml.value
          end
        end
      elsif self.respond_to?(:simple_extensions)
        self[xml.namespace_uri, xml.local_name] << xml.read_inner_xml
      end
    end
    break unless !options[:once] && xml.next == 1 && xml.depth >= starting_depth
  end
end

#to_xml(nodeonly = false, root_name = self.class.name.demodulize.downcase, namespace = nil, namespace_map = nil) ⇒ Object

There doesn’t seem to be a way to set namespaces using libxml-ruby, so ratom has to manage namespace to URI prefixing itself, which makes this method more complicated that it needs to be.



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# File 'lib/atom/xml/parser.rb', line 163

def to_xml(nodeonly = false, root_name = self.class.name.demodulize.downcase, namespace = nil, namespace_map = nil)
  namespace_map = NamespaceMap.new(self.class.namespace) if namespace_map.nil?
  node = XML::Node.new(root_name)
  node['xmlns'] = self.class.namespace unless nodeonly || !self.class.respond_to?(:namespace)
  self.class.extensions_namespaces.each do |ns_alias,uri|
    node["xmlns:#{ns_alias}"] = uri
  end

  self.class.ordered_element_specs.each do |spec|
    if spec.single?
      if attribute = self.send(spec.attribute)
        if attribute.respond_to?(:to_xml)
          node << attribute.to_xml(true, spec.name, spec.options[:namespace], namespace_map)
        else
          n =  XML::Node.new(spec.name)
          n['xmlns'] = spec.options[:namespace] if spec.options[:namespace]
          n << (attribute.is_a?(Time)? attribute.xmlschema : attribute.to_s)
          node << n
        end
      end
    else
      self.send(spec.attribute).each do |attribute|
        if attribute.respond_to?(:to_xml)
          node << attribute.to_xml(true, spec.name.singularize, nil, namespace_map)
        else
          n = XML::Node.new(spec.name.singularize)
          n['xmlns'] = spec.options[:namespace] if spec.options[:namespace]
          n << attribute.to_s
          node << n
        end
      end
    end
  end
  
  (self.class.attributes + self.class.uri_attributes).each do |attribute|
    if value = self.send(accessor_name(attribute))
      if value != 0
        node[attribute] = value.to_s
      end
    end
  end
  
  if self.respond_to?(:simple_extensions) && self.simple_extensions
    self.simple_extensions.each do |name, value_array|
      if name =~ /\{(.*),(.*)\}/
        value_array.each do |value|
          if value_array.as_attribute
            node["#{namespace_map.get($1)}:#{$2}"] = value
          else
            ext = XML::Node.new("#{namespace_map.get($1)}:#{$2}")
            ext << value
            node << ext
          end
        end
      else
        STDERR.print "Couldn't split #{name}"
      end
    end
  end
  
  unless nodeonly
    namespace_map.each do |ns, prefix|
      node["xmlns:#{prefix}"] = ns
    end
    
    doc = XML::Document.new
    doc.root = node
    doc.to_s
  else
    node
  end
end