# Copyright (c) 2010-2013 The University of Manchester, UK.
#
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# modification, are permitted provided that the following conditions are met:
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#  * Redistributions of source code must retain the above copyright notice,
#    this list of conditions and the following disclaimer.
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#  * Redistributions in binary form must reproduce the above copyright notice,
#    this list of conditions and the following disclaimer in the documentation
#    and/or other materials provided with the distribution.
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#    contributors may be used to endorse or promote products derived from this
#    software without specific prior written permission.
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# POSSIBILITY OF SUCH DAMAGE.
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# Author: Robert Haines

require 'rubygems'
require 'libxml'

module T2Server
  module XML
    # Shut the libxml error handler up
    LibXML::XML::Error.set_handler(&LibXML::XML::Error::QUIET_HANDLER)

    module Methods
      def xml_document(string)
        LibXML::XML::Document.string(string)
      end

      def xml_text_node(text)
        LibXML::XML::Node.new_text(text)
      end

      def xml_first_child(node)
        node.first
      end

      def xml_children(doc, &block)
        doc.each { |node| yield node }
      end

      def xml_node_name(node)
        node.name
      end

      def xml_node_content(node)
        node.content
      end

      def xml_node_attribute(node, attribute)
        node.attributes[attribute]
      end

      def xpath_compile(xpath)
        LibXML::XML::XPath::Expression.new(xpath)
      end

      def xpath_find(doc, expr)
        doc.find(expr, Namespaces::MAP)
      end

      def xpath_first(doc, expr)
        doc.find_first(expr, Namespaces::MAP)
      end

      def xpath_attr(doc, expr, attribute)
        node = xpath_first(doc, expr)
        node.nil? ? nil : node.attributes[attribute]
      end
    end
  end
end