Method: XML::DOM::Node#_nodesByLocationTerms

Defined in:

lib/xml/dom/core.rb

#_nodesByLocationTerms(location, pre_keyword = nil) ⇒ Object

Masaki Fukushima

# File 'lib/xml/dom/core.rb', line 906

def _nodesByLocationTerms(location, pre_keyword = nil)
  if location !~ /^([a-z]*)\(([^)]*)\)(\.(.+))?$/
    raise "invalid location: \"#{location}\""
  end
  keyword = $1
  args = $2
  rest = $4
  ## omitted keyword
  keyword = pre_keyword if keyword == ''
  if keyword.nil?
    raise "cannot determine preceding keyword: \"#{location}\""
  end

  case keyword
  when 'child', 'descendant', 'ancestor', 'psibling', 'fsibling',
      'preceding', 'following'
    # relative location term
    _nodesByRelativeLocationTerm("#{keyword}(#{args})") do |node|
      if rest.nil?
        yield node
      else
        node._nodesByLocationTerms(rest, keyword) do |n|
          yield n
        end
      end
    end
  when 'attr'
    # attribute location term
    if args !~ Spec::Name
      raise "invalid attribute name: '#{args}'"
    end
    attr = attributes[args]
    value = (attr.nil? ? nil : Text.new(attr.nodeValue))
    if rest.nil?
      yield value
    elsif !value.nil?
      value._nodesByLocationTerms(rest) do |node|
        yield node
      end
    end
  when 'span', 'string'
    raise "unsupported keyword: '#{keyword}'"
  else
    raise "unknown keyword: '#{keyword}'"
  end
end