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require 'date'
require 'time'
module Sawyer
class Serializer
def self.any_json
yajl || multi_json || json || begin
raise RuntimeError, "Sawyer requires a JSON gem: yajl, multi_json, or json"
end
end
def self.yajl
require 'yajl'
new(Yajl)
rescue LoadError
end
def self.json
require 'json'
new(JSON)
rescue LoadError
end
def self.multi_json
require 'multi_json'
new(MultiJson)
rescue LoadError
end
def self.message_pack
require 'msgpack'
new(MessagePack, :pack, :unpack)
rescue LoadError
end
# Public: Wraps a serialization format for Sawyer. Nested objects are
# prepared for serialization (such as changing Times to ISO 8601 Strings).
# Any serialization format that responds to #dump and #load will work.
def initialize(format, dump_method_name = nil, load_method_name = nil)
@format = format
@dump = @format.method(dump_method_name || :dump)
@load = @format.method(load_method_name || :load)
end
# Public: Encodes an Object (usually a Hash or Array of Hashes).
#
# data - Object to be encoded.
#
# Returns an encoded String.
def encode(data)
@dump.call(encode_object(data))
end
alias dump encode
# Public: Decodes a String into an Object (usually a Hash or Array of
# Hashes).
#
# data - An encoded String.
#
# Returns a decoded Object.
def decode(data)
return nil if data.nil? || data.strip.empty?
decode_object(@load.call(data))
end
alias load decode
def encode_object(data)
case data
when Hash then encode_hash(data)
when Array then data.map { |o| encode_object(o) }
else data
end
end
def encode_hash(hash)
hash.keys.each do |key|
case value = hash[key]
when Date then hash[key] = value.to_time.utc.xmlschema
when Time then hash[key] = value.utc.xmlschema
when Hash then hash[key] = encode_hash(value)
end
end
hash
end
def decode_object(data)
case data
when Hash then decode_hash(data)
when Array then data.map { |o| decode_object(o) }
else data
end
end
def decode_hash(hash)
hash.keys.each do |key|
hash[key.to_sym] = decode_hash_value(key, hash.delete(key))
end
hash
end
def decode_hash_value(key, value)
if time_field?(key, value)
if value.is_a?(String)
begin
Time.parse(value)
rescue ArgumentError
value
end
elsif value.is_a?(Integer) || value.is_a?(Float)
Time.at(value)
else
value
end
elsif value.is_a?(Hash)
decode_hash(value)
elsif value.is_a?(Array)
value.map { |o| decode_hash_value(key, o) }
else
value
end
end
def time_field?(key, value)
value && (key =~ /_(at|on)\z/ || key =~ /(\A|_)date\z/)
end
end
end
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