lib/bson/code.rb
# frozen_string_literal: true
# rubocop:todo all
# Copyright (C) 2009-2020 MongoDB Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
module BSON
# Represents a code type, which is a wrapper around javascript code.
#
# @see http://bsonspec.org/#/specification
#
# @since 2.0.0
class Code
include JSON
# A code is type 0x0D in the BSON spec.
#
# @since 2.0.0
BSON_TYPE = ::String.new(13.chr, encoding: BINARY).freeze
# @!attribute javascript
# @return [ String ] The javascript code.
# @since 2.0.0
attr_reader :javascript
# Determine if this code object is equal to another object.
#
# @example Check the code equality.
# code == other
#
# @param [ Object ] other The object to compare against.
#
# @return [ true, false ] If the objects are equal.
#
# @since 2.0.0
def ==(other)
return false unless other.is_a?(Code)
javascript == other.javascript
end
# Return a representation of the object for use in
# application-level JSON serialization. Since BSON::Code
# is used exclusively in BSON-related contexts, this
# method returns the canonical Extended JSON representation.
#
# @return [ Hash ] The extended json representation.
def as_json(*_args)
as_extended_json
end
# Converts this object to a representation directly serializable to
# Extended JSON (https://github.com/mongodb/specifications/blob/master/source/extended-json.rst).
#
# @option opts [ nil | :relaxed | :legacy ] :mode Serialization mode
# (default is canonical extended JSON)
#
# @return [ Hash ] The extended json representation.
def as_extended_json(**_options)
{ "$code" => javascript }
end
# Instantiate the new code.
#
# @example Instantiate the new code.
# BSON::Code.new("this.value = 5")
#
# @param [ String ] javascript The javascript code.
#
# @since 2.0.0
def initialize(javascript = "")
@javascript = javascript
end
# Encode the javascript code.
#
# @example Encode the code.
# code.to_bson
#
# @return [ BSON::ByteBuffer ] The buffer with the encoded object.
#
# @see http://bsonspec.org/#/specification
#
# @since 2.0.0
def to_bson(buffer = ByteBuffer.new)
buffer.put_string(javascript) # @todo: was formerly to_bson_string
end
# Deserialize code from BSON.
#
# @param [ ByteBuffer ] buffer The byte buffer.
#
# @option options [ nil | :bson ] :mode Decoding mode to use.
#
# @return [ TrueClass, FalseClass ] The decoded code.
#
# @see http://bsonspec.org/#/specification
#
# @since 2.0.0
def self.from_bson(buffer, **options)
new(buffer.get_string)
end
# Register this type when the module is loaded.
#
# @since 2.0.0
Registry.register(BSON_TYPE, self)
end
end