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require 'active_support/xml_mini'
require 'active_support/time'
require 'active_support/core_ext/array/wrap'
require 'active_support/core_ext/hash/reverse_merge'
require 'active_support/core_ext/object/blank'
require 'active_support/core_ext/string/inflections'
class Hash
# Returns a string containing an XML representation of its receiver:
#
# {"foo" => 1, "bar" => 2}.to_xml
# # =>
# # <?xml version="1.0" encoding="UTF-8"?>
# # <hash>
# # <foo type="integer">1</foo>
# # <bar type="integer">2</bar>
# # </hash>
#
# To do so, the method loops over the pairs and builds nodes that depend on
# the _values_. Given a pair +key+, +value+:
#
# * If +value+ is a hash there's a recursive call with +key+ as <tt>:root</tt>.
#
# * If +value+ is an array there's a recursive call with +key+ as <tt>:root</tt>,
# and +key+ singularized as <tt>:children</tt>.
#
# * If +value+ is a callable object it must expect one or two arguments. Depending
# on the arity, the callable is invoked with the +options+ hash as first argument
# with +key+ as <tt>:root</tt>, and +key+ singularized as second argument. Its
# return value becomes a new node.
#
# * If +value+ responds to +to_xml+ the method is invoked with +key+ as <tt>:root</tt>.
#
# * Otherwise, a node with +key+ as tag is created with a string representation of
# +value+ as text node. If +value+ is +nil+ an attribute "nil" set to "true" is added.
# Unless the option <tt>:skip_types</tt> exists and is true, an attribute "type" is
# added as well according to the following mapping:
#
# XML_TYPE_NAMES = {
# "Symbol" => "symbol",
# "Fixnum" => "integer",
# "Bignum" => "integer",
# "BigDecimal" => "decimal",
# "Float" => "float",
# "TrueClass" => "boolean",
# "FalseClass" => "boolean",
# "Date" => "date",
# "DateTime" => "datetime",
# "Time" => "datetime"
# }
#
# By default the root node is "hash", but that's configurable via the <tt>:root</tt> option.
#
# The default XML builder is a fresh instance of <tt>Builder::XmlMarkup</tt>. You can
# configure your own builder with the <tt>:builder</tt> option. The method also accepts
# options like <tt>:dasherize</tt> and friends, they are forwarded to the builder.
def to_xml(options = {})
require 'builder' unless defined?(Builder)
options = options.dup
options[:indent] ||= 2
options[:root] ||= "hash"
options[:builder] ||= Builder::XmlMarkup.new(:indent => options[:indent])
builder = options[:builder]
builder.instruct! unless options.delete(:skip_instruct)
root = ActiveSupport::XmlMini.rename_key(options[:root].to_s, options)
builder.__send__(:method_missing, root) do
each { |key, value| ActiveSupport::XmlMini.to_tag(key, value, options) }
yield builder if block_given?
end
end
class << self
def from_xml(xml)
typecast_xml_value(unrename_keys(ActiveSupport::XmlMini.parse(xml)))
end
private
def typecast_xml_value(value)
case value.class.to_s
when 'Hash'
if value['type'] == 'array'
child_key, entries = Array.wrap(value.detect { |k,v| k != 'type' }) # child_key is throwaway
if entries.nil? || (c = value['__content__'] && c.blank?)
[]
else
case entries.class.to_s # something weird with classes not matching here. maybe singleton methods breaking is_a?
when "Array"
entries.collect { |v| typecast_xml_value(v) }
when "Hash"
[typecast_xml_value(entries)]
else
raise "can't typecast #{entries.inspect}"
end
end
elsif value.has_key?("__content__")
content = value["__content__"]
if parser = ActiveSupport::XmlMini::PARSING[value["type"]]
parser.arity == 1 ? parser.call(content) : parser.call(content, value)
else
content
end
elsif value['type'] == 'string' && value['nil'] != 'true'
""
# blank or nil parsed values are represented by nil
elsif value.blank? || value['nil'] == 'true'
nil
# If the type is the only element which makes it then
# this still makes the value nil, except if type is
# a XML node(where type['value'] is a Hash)
elsif value['type'] && value.size == 1 && !value['type'].is_a?(::Hash)
nil
else
xml_value = value.inject({}) do |h,(k,v)|
h[k] = typecast_xml_value(v)
h
end
# Turn { :files => { :file => #<StringIO> } into { :files => #<StringIO> } so it is compatible with
# how multipart uploaded files from HTML appear
xml_value["file"].is_a?(StringIO) ? xml_value["file"] : xml_value
end
when 'Array'
value.map! { |i| typecast_xml_value(i) }
value.length > 1 ? value : value.first
when 'String'
value
else
raise "can't typecast #{value.class.name} - #{value.inspect}"
end
end
def unrename_keys(params)
case params.class.to_s
when "Hash"
params.inject({}) do |h,(k,v)|
h[k.to_s.tr("-", "_")] = unrename_keys(v)
h
end
when "Array"
params.map { |v| unrename_keys(v) }
else
params
end
end
end
end
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