# XSD4R - XML Instance parser library.
# Copyright (C) 2000-2007  NAKAMURA, Hiroshi <nahi@ruby-lang.org>.

# This program is copyrighted free software by NAKAMURA, Hiroshi.  You can
# redistribute it and/or modify it under the same terms of Ruby's license;
# either the dual license version in 2003, or any later version.


require 'xsd/xmlparser/parser'


module XSD


module XMLParser
  def create_parser(host, opt)
    XSD::XMLParser::Parser.create_parser(host, opt)
  end
  module_function :create_parser

  # $1 is necessary.
  NSParseRegexp = Regexp.new('^xmlns:?(.*)$', nil, 'NONE')

  def filter_ns(ns, attrs)
    ns_updated = false
    if attrs.nil? or attrs.empty?
      return [ns, attrs]
    end
    newattrs = {}
    attrs.each do |key, value|
      if NSParseRegexp =~ key
        unless ns_updated
          ns = ns.clone_ns
          ns_updated = true
        end
	# tag == '' means 'default namespace'
        # value == '' means 'no default namespace'
	tag = $1 || ''
	ns.assign(value, tag)
      else
	newattrs[key] = value
      end
    end
    return [ns, newattrs]
  end
  module_function :filter_ns
end


end


# Try to load XML processor.
loaded = false
[
  'xsd/xmlparser/libxmlparser',
  'xsd/xmlparser/xmlparser',
  'xsd/xmlparser/xmlscanner',
  'xsd/xmlparser/rexmlparser',
].each do |lib|
  begin
    require lib
    # XXX: for a workaround of rubygems' require inconsistency
    # XXX: MUST BE REMOVED IN THE FUTURE
    name = lib.sub(/^.*\//, '')
    raise LoadError unless XSD::XMLParser.constants.find { |c|
      c.to_s.downcase == name
    }
    loaded = true
    break
  rescue LoadError
  end
end
unless loaded
  raise RuntimeError.new("XML processor module not found.")
end