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# frozen_string_literal: true
# rubocop:todo all
# Copyright (C) 2009-2021 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
# Injects behaviour for encoding and decoding BigDecimals
# to and from raw bytes as specified by the BSON spec.
#
# @see http://bsonspec.org/#/specification
module BigDecimal
# BigDecimals are serialized as Decimal128s under the hood. A Decimal128
# is type 0x13 in the BSON spec.
BSON_TYPE = ::String.new(19.chr, encoding: BINARY).freeze
# Get the BigDecimal as encoded BSON.
#
# @example Get the BigDecimal as encoded BSON.
# BigDecimal("1").to_bson
#
# @return [ BSON::ByteBuffer ] The buffer with the encoded object.
#
# @see http://bsonspec.org/#/specification
def to_bson(buffer = ByteBuffer.new)
BSON::Decimal128.new(to_s).to_bson(buffer)
end
# Get the BSON type for BigDecimal. This is the same BSON type as
# BSON::Decimal128.
def bson_type
BSON_TYPE
end
module ClassMethods
# Deserialize the BigDecimal from raw BSON bytes. If the :mode option
# is set to BSON, this will return a BSON::Decimal128
#
# @example Get the BigDecimal from BSON.
# BigDecimal.from_bson(bson)
#
# @param [ ByteBuffer ] buffer The byte buffer.
#
# @option options [ nil | :bson ] :mode Decoding mode to use.
#
# @return [ BigDecimal | BSON::Decimal128 ] The decimal object.
def from_bson(buffer, **options)
dec128 = Decimal128.from_bson(buffer, **options)
if options[:mode] == :bson
dec128
else
dec128.to_d
end
end
end
# Register this type when the module is loaded.
Registry.register(BSON_TYPE, ::BigDecimal)
end
# Enrich the core BigDecimal class with this module.
::BigDecimal.send(:include, BigDecimal)
::BigDecimal.send(:extend, BigDecimal::ClassMethods)
end
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