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nokogiri.rb
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nokogiri.rb
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module RDF::RDFXML
class Reader < RDF::Reader
##
# Nokogiri implementation of an XML parser.
#
# @see http://nokogiri.org/
module Nokogiri
##
# Returns the name of the underlying XML library.
#
# @return [Symbol]
def self.library
:nokogiri
end
# Proxy class to implement uniform element accessors
class NodeProxy
attr_reader :node
attr_reader :parent
def initialize(node, parent = nil)
@node = node
@parent = parent
end
# Create a new element child of an existing node
def create_node(name, children)
native = ::Nokogiri::XML::Element.new(name, @node)
children.each do |c|
native.add_child(c.node)
end
NodeProxy.new(native, self)
end
##
# Element language
#
# @return [String]
def language
attribute_with_ns("lang", RDF::XML.to_s)
end
##
# Get any xml:base in effect for this element
#
# @return [String]
def base
if @base.nil?
@base = attribute_with_ns("base", RDF::XML.to_s) ||
(parent && parent.element? && parent.base) ||
false
end
@base == false ? nil : @base
end
##
# Monkey patch attribute_with_ns, to insure nil is returned for #null?
#
# Get the attribute node with name and namespace
#
# @param [String] name
# @param [String] namespace
# @return [Nokogiri::XML::Attr]
def attribute_with_ns(name, namespace)
a = @node.attribute_with_ns(name, namespace)
(a.respond_to?(:null?) && a.null?) ? nil : a # to ensure FFI Pointer compatibility
end
def display_path
@display_path ||= begin
path = []
path << parent.display_path if parent
path << @node.name
case @node
when ::Nokogiri::XML::Element then path.join("/")
when ::Nokogiri::XML::Attr then path.join("@")
else path.join("?")
end
end
end
##
# Return true of this is a text node
#
# @return [Array<:text, :element, :attribute>]
def text?
(@node.text? || @node.cdata?) && !@node.blank?
end
##
# Return true of all child elements are text
#
# @return [Array<:text, :element, :attribute>]
def text_content?
@text_content ||= @node.children.all? {|c| c.text?}
end
##
# Retrieve XMLNS definitions for this element
#
# @return [Hash{String => String}]
def namespaces
@namespaces ||= @node.namespace_definitions.inject({}) {|memo, ns| memo[ns.prefix] = ns.href.to_s; memo }
end
##
# Children of this node
#
# @return [NodeSetProxy]
def children
@children ||= NodeSetProxy.new(@node.children, self)
end
# Ancestors of this element, in order
def ancestors
@ancestors ||= parent ? parent.ancestors + [parent] : []
end
##
# Inner text of an element. Decode Entities
#
# @return [String]
#def inner_text
# coder = HTMLEntities.new
# coder.decode(@node.inner_text)
#end
def attribute_nodes
@attribute_nodes ||= NodeSetProxy.new(@node.attribute_nodes, self)
end
def xpath(*args)
@node.xpath(*args).map do |n|
# Get node ancestors
parent = n.ancestors.reverse.inject(nil) do |p,node|
NodeProxy.new(node, p)
end
NodeProxy.new(n, parent)
end
end
def at_xpath(*args)
xpath(*args).first
end
# For jRuby, there is a bug that prevents the namespace from being set on an element
if RUBY_PLATFORM == "java"
def add_namespace(prefix, href)
@def_namespace = href if prefix.nil?
@node.add_namespace(prefix, href)
end
def namespace
@def_namespace || @node.namespace
end
else
def add_namespace(prefix, href)
@node.add_namespace(prefix, href)
end
def namespace
@node.namespace
end
end
# URI of namespace + node_name
def uri
ns = namespace || RDF::XML.to_s
ns = ns.href if ns.respond_to?(:href)
RDF::URI.intern(ns + self.node_name)
end
def to_s; @node.to_s; end
##
# Proxy for everything else to @node
def method_missing(method, *args)
@node.send(method, *args)
end
end
##
# NodeSet proxy
class NodeSetProxy
attr_reader :node_set
attr_reader :parent
def initialize(node_set, parent)
@node_set = node_set
@parent = parent
end
##
# Return a proxy for each child
#
# @yield child
# @yieldparam [NodeProxy]
def each
@node_set.each do |c|
yield NodeProxy.new(c, parent)
end
end
##
# Return selected NodeProxies based on selection
#
# @yield child
# @yieldparam [NodeProxy]
# @return [Array[NodeProxy]]
def select
@node_set.to_a.map {|n| NodeProxy.new(n, parent)}.select do |c|
yield c
end
end
##
# Proxy for everything else to @node_set
def method_missing(method, *args)
@node_set.send(method, *args)
end
end
##
# Initializes the underlying XML library.
#
# @param [Hash{Symbol => Object}] options
# @return [void]
def initialize_xml(input, options = {})
require 'nokogiri' unless defined?(::Nokogiri)
@doc = case input
when ::Nokogiri::XML::Document
input
else
# Try to detect charset from input
options[:encoding] ||= input.charset if input.respond_to?(:charset)
# Otherwise, default is utf-8
options[:encoding] ||= 'utf-8'
options[:encoding] = options[:encoding].to_s if options[:encoding]
::Nokogiri::XML.parse(input.respond_to?(:read) ? input.read : input.to_s, base_uri.to_s, options[:encoding]) do |config|
config.noent
end
end
end
# Accessor methods to mask native elements & attributes
##
# Return proxy for document root
def root
@root ||= NodeProxy.new(@doc.root) if @doc && @doc.root
end
##
# Document errors
def doc_errors
@doc.errors
end
end
end
end