50 lines
1.2 KiB
Ruby
50 lines
1.2 KiB
Ruby
# frozen_string_literal: true
|
|
unless defined?(::JSON::JSON_LOADED) and ::JSON::JSON_LOADED
|
|
require 'json'
|
|
end
|
|
|
|
class Rational
|
|
|
|
# See #as_json.
|
|
def self.json_create(object)
|
|
Rational(object['n'], object['d'])
|
|
end
|
|
|
|
# Methods <tt>Rational#as_json</tt> and +Rational.json_create+ may be used
|
|
# to serialize and deserialize a \Rational object;
|
|
# see Marshal[https://docs.ruby-lang.org/en/master/Marshal.html].
|
|
#
|
|
# \Method <tt>Rational#as_json</tt> serializes +self+,
|
|
# returning a 2-element hash representing +self+:
|
|
#
|
|
# require 'json/add/rational'
|
|
# x = Rational(2, 3).as_json
|
|
# # => {"json_class"=>"Rational", "n"=>2, "d"=>3}
|
|
#
|
|
# \Method +JSON.create+ deserializes such a hash, returning a \Rational object:
|
|
#
|
|
# Rational.json_create(x)
|
|
# # => (2/3)
|
|
#
|
|
def as_json(*)
|
|
{
|
|
JSON.create_id => self.class.name,
|
|
'n' => numerator,
|
|
'd' => denominator,
|
|
}
|
|
end
|
|
|
|
# Returns a JSON string representing +self+:
|
|
#
|
|
# require 'json/add/rational'
|
|
# puts Rational(2, 3).to_json
|
|
#
|
|
# Output:
|
|
#
|
|
# {"json_class":"Rational","n":2,"d":3}
|
|
#
|
|
def to_json(*args)
|
|
as_json.to_json(*args)
|
|
end
|
|
end
|