75 lines
1.8 KiB
Ruby
75 lines
1.8 KiB
Ruby
|
module MultiJson
|
||
|
|
class DecodeError < StandardError; end
|
||
|
|
module_function
|
||
|
|
|
||
|
|
@engine = nil
|
||
|
|
|
||
|
|
# Get the current engine class.
|
||
|
|
def engine
|
||
|
|
return @engine if @engine
|
||
|
|
self.engine = self.default_engine
|
||
|
|
@engine
|
||
|
|
end
|
||
|
|
|
||
|
|
REQUIREMENT_MAP = [
|
||
|
|
["yajl", :yajl],
|
||
|
|
["json", :json_gem],
|
||
|
|
["json/pure", :json_pure]
|
||
|
|
]
|
||
|
|
|
||
|
|
# The default engine based on what you currently
|
||
|
|
# have loaded and installed. First checks to see
|
||
|
|
# if any engines are already loaded, then checks
|
||
|
|
# to see which are installed if none are loaded.
|
||
|
|
def default_engine
|
||
|
|
return :yajl if defined?(::Yajl)
|
||
|
|
return :json_gem if defined?(::JSON)
|
||
|
|
|
||
|
|
REQUIREMENT_MAP.each do |(library, engine)|
|
||
|
|
begin
|
||
|
|
require library
|
||
|
|
return engine
|
||
|
|
rescue LoadError
|
||
|
|
next
|
||
|
|
end
|
||
|
|
end
|
||
|
|
|
||
|
|
:ok_json
|
||
|
|
end
|
||
|
|
|
||
|
|
# Set the JSON parser utilizing a symbol, string, or class.
|
||
|
|
# Supported by default are:
|
||
|
|
#
|
||
|
|
# * <tt>:json_gem</tt>
|
||
|
|
# * <tt>:json_pure</tt>
|
||
|
|
# * <tt>:ok_json</tt>
|
||
|
|
# * <tt>:yajl</tt>
|
||
|
|
def engine=(new_engine)
|
||
|
|
case new_engine
|
||
|
|
when String, Symbol
|
||
|
|
require "multi_json/engines/#{new_engine}"
|
||
|
|
@engine = MultiJson::Engines.const_get("#{new_engine.to_s.split('_').map{|s| s.capitalize}.join('')}")
|
||
|
|
when Class
|
||
|
|
@engine = new_engine
|
||
|
|
else
|
||
|
|
raise "Did not recognize your engine 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.
|
||
|
|
def decode(string, options = {})
|
||
|
|
engine.decode(string, options)
|
||
|
|
rescue engine::ParseError => exception
|
||
|
|
raise DecodeError, exception.message, exception.backtrace
|
||
|
|
end
|
||
|
|
|
||
|
|
# Encodes a Ruby object as JSON.
|
||
|
|
def encode(object)
|
||
|
|
engine.encode(object)
|
||
|
|
end
|
||
|
|
end
|