module MultiJson

# File lib/multi_json.rb, line 63
def adapter
  return @adapter if defined?(@adapter) && @adapter

  self.use nil # load default adapter

  @adapter
end

# File lib/multi_json.rb, line 120
def current_adapter(options={})
  if new_adapter = options[:adapter]
    load_adapter(new_adapter)
  else
    adapter
  end
end

# File lib/multi_json.rb, line 42
def default_adapter
  return :oj if defined?(::Oj)
  return :yajl if defined?(::Yajl)
  return :json_gem if defined?(::JSON)
  return :gson if defined?(::Gson)

  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

# File lib/multi_json.rb, line 22
def default_options=(value)
  Kernel.warn "MultiJson.default_options setter is deprecated\n" +
    "Use MultiJson.load_options and MultiJson.dump_options instead"

  self.load_options = self.dump_options = value
end

# File lib/multi_json.rb, line 129
def dump(object, options={})
  current_adapter(options).dump(object, options)
end

# File lib/multi_json.rb, line 110
def load(string, options={})
  adapter = current_adapter(options)
  begin
    adapter.load(string, options)
  rescue adapter::ParseError => exception
    raise LoadError.new(exception.message, exception.backtrace, string)
  end
end

# File lib/multi_json.rb, line 88
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
    load_adapter default_adapter
  when Class, Module
    new_adapter
  else
    raise NameError
  end
rescue NameError, ::LoadError
  raise ArgumentError, 'Did not recognize your adapter specification.'
end

# File lib/multi_json.rb, line 82
def use(new_adapter)
  @adapter = load_adapter(new_adapter)
end

# File lib/multi_json.rb, line 135
def with_adapter(new_adapter)
  old_adapter, self.adapter = adapter, new_adapter
  yield
ensure
  self.adapter = old_adapter
end