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# dbus/xml.rb - introspection parser, rexml/nokogiri abstraction
#
# This file is part of the ruby-dbus project
# Copyright (C) 2007 Arnaud Cornet and Paul van Tilburg
# Copyright (C) 2012 Geoff Youngs
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License, version 2.1 as published by the Free Software Foundation.
# See the file "COPYING" for the exact licensing terms.
# TODO: check if it is slow, make replaceable
require "rexml/document"
begin
require "nokogiri"
rescue LoadError
end
module DBus
# = D-Bus introspect XML parser class
#
# This class parses introspection XML of an object and constructs a tree
# of Node, Interface, Method, Signal instances.
class IntrospectXMLParser
class << self
attr_accessor :backend
end
# Creates a new parser for XML data in string _xml_.
def initialize(xml)
@xml = xml
end
class AbstractXML
def self.have_nokogiri?
Object.const_defined?("Nokogiri")
end
class Node
def initialize(node)
@node = node
end
# required methods
# returns node attribute value
def [](key); end
# yields child nodes which match xpath of type AbstractXML::Node
def each(xpath); end
end
# required methods
# initialize parser with xml string
def initialize(xml); end
# yields nodes which match xpath of type AbstractXML::Node
def each(xpath); end
end
class NokogiriParser < AbstractXML
class NokogiriNode < AbstractXML::Node
def [](key)
@node[key]
end
def each(path, &block)
@node.search(path).each { |node| block.call NokogiriNode.new(node) }
end
end
def initialize(xml)
@doc = Nokogiri.XML(xml)
end
def each(path, &block)
@doc.search("//#{path}").each { |node| block.call NokogiriNode.new(node) }
end
end
class REXMLParser < AbstractXML
class REXMLNode < AbstractXML::Node
def [](key)
@node.attributes[key]
end
def each(path, &block)
@node.elements.each(path) { |node| block.call REXMLNode.new(node) }
end
end
def initialize(xml)
@doc = REXML::Document.new(xml)
end
def each(path, &block)
@doc.elements.each(path) { |node| block.call REXMLNode.new(node) }
end
end
@backend = if AbstractXML.have_nokogiri?
NokogiriParser
else
REXMLParser
end
# @return [Array(Array<Interface>,Array<String>)]
# a pair: [list of Interfaces, list of direct subnode names]
def parse
# Using a Hash instead of a list helps merge split-up interfaces,
# a quirk observed in ModemManager (I#41).
interfaces = Hash.new do |hash, missing_key|
hash[missing_key] = Interface.new(missing_key)
end
subnodes = []
t = Time.now
d = IntrospectXMLParser.backend.new(@xml)
d.each("node/node") do |e|
subnodes << e["name"]
end
d.each("node/interface") do |e|
i = interfaces[e["name"]]
e.each("method") do |me|
m = Method.new(me["name"])
parse_methsig(me, m)
i << m
end
e.each("signal") do |se|
s = Signal.new(se["name"])
parse_methsig(se, s)
i << s
end
end
d = Time.now - t
if d > 2
DBus.logger.debug "Some XML took more that two secs to parse. Optimize me!"
end
[interfaces.values, subnodes]
end
######################################################################
private
# Parses a method signature XML element _e_ and initialises
# method/signal _m_.
def parse_methsig(e, m)
e.each("arg") do |ae|
name = ae["name"]
dir = ae["direction"]
sig = ae["type"]
if m.is_a?(DBus::Signal)
# Direction can only be "out", ignore it
m.add_fparam(name, sig)
elsif m.is_a?(DBus::Method)
case dir
# This is a method, so dir defaults to "in"
when "in", nil
m.add_fparam(name, sig)
when "out"
m.add_return(name, sig)
end
else
raise NotImplementedError, dir
end
end
end
end # class IntrospectXMLParser
end # module DBus
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