mongo-ruby-driver/lib/mongo/util/xml_to_ruby.rb

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# --
# Copyright (C) 2008-2009 10gen Inc.
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License, version 3, as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License
# for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# ++
require 'rexml/document'
require 'mongo'
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# Converts a .xson file (an XML file that describes a Mongo-type document) to
# an OrderedHash.
class XMLToRuby
include XGen::Mongo::Driver
def xml_to_ruby(io)
doc = REXML::Document.new(io)
doc_to_ruby(doc.root.elements['doc'])
end
protected
def element_to_ruby(e)
type = e.name
child = e.elements[1]
case type
when 'oid'
ObjectID.from_string(e.text)
when 'ref'
dbref_to_ruby(e.elements)
when 'int'
e.text.to_i
when 'number'
e.text.to_f
when 'string', 'code'
e.text.to_s
when 'binary'
Base64.decode64(e.text.to_s).to_mongo_binary
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when 'symbol'
e.text.to_s.intern
when 'boolean'
e.text.to_s == 'true'
when 'array'
array_to_ruby(e.elements)
when 'date'
Time.at(e.text.to_f / 1000.0)
when 'regex'
regex_to_ruby(e.elements)
when 'null', 'undefined'
nil
when 'doc'
doc_to_ruby(e)
else
raise "Unknown type #{type} in element with name #{e.attributes['name']}"
end
end
def doc_to_ruby(element)
oh = OrderedHash.new
element.elements.each { |e| oh[e.attributes['name']] = element_to_ruby(e) }
oh
end
def array_to_ruby(elements)
a = []
elements.each { |e|
index_str = e.attributes['name']
a[index_str.to_i] = element_to_ruby(e)
}
a
end
def regex_to_ruby(elements)
pattern = elements['pattern'].text
options_str = elements['options'].text || ''
options = 0
options |= Regexp::IGNORECASE if options_str.include?('i')
options |= Regexp::MULTILINE if options_str.include?('m')
options |= Regexp::EXTENDED if options_str.include?('x')
Regexp.new(pattern, options)
end
def dbref_to_ruby(elements)
ns = elements['ns'].text
oid_str = elements['oid'].text
DBRef.new(nil, nil, nil, ns, ObjectID.from_string(oid_str))
end
end