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module MultiJson
class DecodeError < StandardError
attr_reader :data
def initialize(message, backtrace, data)
super(message)
self.set_backtrace(backtrace)
@data = data
end
end
@adapter = nil
REQUIREMENT_MAP = [
["oj", :oj],
["yajl", :yajl],
["json", :json_gem],
["json/pure", :json_pure]
]
class << self
# The default adapter based on what you currently
# have loaded and installed. First checks to see
# if any adapters are already loaded, then checks
# to see which are installed if none are loaded.
def default_adapter
return :oj if defined?(::Oj)
return :yajl if defined?(::Yajl)
return :json_gem if defined?(::JSON)
REQUIREMENT_MAP.each do |(library, adapter)|
begin
require library
return adapter
rescue LoadError
next
end
end
Kernel.warn "[WARNING] MultiJson is using the default adapter (ok_json). We recommend loading a different JSON library to improve performance."
:ok_json
end
# :nodoc:
alias :default_engine :default_adapter
# Get the current adapter class.
def adapter
return @adapter if @adapter
self.use self.default_adapter
@adapter
end
# :nodoc:
alias :engine :adapter
# Set the JSON parser utilizing a symbol, string, or class.
# Supported by default are:
#
# * <tt>:oj</tt>
# * <tt>:json_gem</tt>
# * <tt>:json_pure</tt>
# * <tt>:ok_json</tt>
# * <tt>:yajl</tt>
# * <tt>:nsjsonserialization</tt> (MacRuby only)
def use(new_adapter)
@adapter = load_adapter(new_adapter)
end
alias :adapter= :use
# :nodoc:
alias :engine= :use
def load_adapter(new_adapter)
case new_adapter
when String, Symbol
require "multi_json/adapters/#{new_adapter}"
MultiJson::Adapters.const_get("#{new_adapter.to_s.split('_').map{|s| s.capitalize}.join('')}")
when NilClass
nil
when Class
new_adapter
else
raise "Did not recognize your adapter specification. Please specify either a symbol or a class."
end
end
# Decode a JSON string into Ruby.
#
# <b>Options</b>
#
# <tt>:symbolize_keys</tt> :: If true, will use symbols instead of strings for the keys.
# <tt>:adapter</tt> :: If set, the selected engine will be used just for the call.
def load(string, options={})
adapter = current_adapter(options)
adapter.load(string, options)
rescue adapter::ParseError => exception
raise DecodeError.new(exception.message, exception.backtrace, string)
end
# :nodoc:
alias :decode :load
def current_adapter(options)
if new_adapter = (options || {}).delete(:adapter)
load_adapter(new_adapter)
else
adapter
end
end
# Encodes a Ruby object as JSON.
def dump(object, options={})
adapter = current_adapter(options)
adapter.dump(object, options)
end
# :nodoc:
alias :encode :dump
end
end
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