Module: MultiJson

Defined in:
lib/multi_json/vendor/okjson.rb,
lib/multi_json.rb,
lib/multi_json/version.rb,
lib/multi_json/adapters/oj.rb,
lib/multi_json/adapters/yajl.rb,
lib/multi_json/adapters/ok_json.rb,
lib/multi_json/adapters/json_gem.rb,
lib/multi_json/adapters/json_pure.rb,
lib/multi_json/adapters/json_common.rb,
lib/multi_json/adapters/nsjsonserialization.rb

Overview

Some parts adapted from golang.org/src/pkg/json/decode.go and golang.org/src/pkg/utf8/utf8.go

Defined Under Namespace

Modules: Adapters, OkJson Classes: DecodeError

Constant Summary collapse

REQUIREMENT_MAP = 
[
  ["oj", :oj],
  ["yajl", :yajl],
  ["json", :json_gem],
  ["json/pure", :json_pure]
]
VERSION = 
"1.5.0"

Class Method Summary collapse

Class Method Details

.adapter ⇒ Object Also known as: engine

Get the current adapter class.



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# File 'lib/multi_json.rb', line 47

def adapter
  return @adapter if @adapter
  self.use self.default_adapter
  @adapter
end

.current_adapter(options) ⇒ Object 



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# File 'lib/multi_json.rb', line 104

def current_adapter(options)
  if new_adapter = (options || {}).delete(:adapter)
    load_adapter(new_adapter)
  else
    adapter
  end
end

.default_adapter ⇒ Object Also known as: default_engine

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.



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# File 'lib/multi_json.rb', line 26

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

.dump(object, options = {}) ⇒ Object Also known as: encode

Encodes a Ruby object as JSON.



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# File 'lib/multi_json.rb', line 113

def dump(object, options={})
  adapter = current_adapter(options)
  adapter.dump(object, options)
end

.load(string, options = {}) ⇒ Object Also known as: decode

Decode a JSON string into Ruby.

Options

:symbolize_keys

If true, will use symbols instead of strings for the keys.

:adapter

If set, the selected engine will be used just for the call.



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# File 'lib/multi_json.rb', line 93

def load(string, options={})
  adapter = current_adapter(options)
  begin
    adapter.load(string, options)
  rescue adapter::ParseError => exception
    raise DecodeError.new(exception.message, exception.backtrace, string)
  end
end

.load_adapter(new_adapter) ⇒ Object 



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# File 'lib/multi_json.rb', line 71

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, FalseClass
    default_adapter = self.default_adapter
    require "multi_json/adapters/#{default_adapter}"
    MultiJson::Adapters.const_get(:"#{default_adapter.to_s.split('_').map{|s| s.capitalize}.join('')}")
  when Class
    new_adapter
  else
    raise "Did not recognize your adapter specification. Please specify either a symbol or a class."
  end
end

.use(new_adapter) ⇒ Object Also known as: adapter=, engine=

Set the JSON parser utilizing a symbol, string, or class. Supported by default are:

  • :oj

  • :json_gem

  • :json_pure

  • :ok_json

  • :yajl

  • :nsjsonserialization (MacRuby only)



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# File 'lib/multi_json.rb', line 64

def use(new_adapter)
  @adapter = load_adapter(new_adapter)
end

.with_adapter(new_adapter) ⇒ Object Also known as: with_engine 



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# File 'lib/multi_json.rb', line 120

def with_adapter(new_adapter)
  old_adapter, self.adapter = adapter, new_adapter
  yield
ensure
  self.adapter = old_adapter
end