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class Rational

yaml_as "tag:ruby.yaml.org,2002:object:Rational"

def Rational.yaml_new( klass, tag, val )

if val.is_a? String

Rational( val )

else

Rational( val['numerator'], val['denominator'] )

end

end

def to_yaml( opts = {} )

YAML::quick_emit( self, opts ) do |out|

out.map( taguri, nil ) do |map|

map.add( 'denominator', denominator )

map.add( 'numerator', numerator )

end

end

end

end

class Complex

yaml_as "tag:ruby.yaml.org,2002:object:Complex"

def Complex.yaml_new( klass, tag, val )

if val.is_a? String

Complex( val )

else

Complex( val['real'], val['image'] )

end

end

def to_yaml( opts = {} )

YAML::quick_emit( self, opts ) do |out|

out.map( taguri, nil ) do |map|

map.add( 'image', imaginary )

map.add( 'real', real )

end

end

end

end

def test_ruby_rational

assert_to_yaml( Rational(1, 2), <<EOY )

--- !ruby/object:Rational

numerator: 1

denominator: 2

EOY

# Read YAML dumped by the ruby 1.8.3.

assert_to_yaml( Rational(1, 2), "!ruby/object:Rational 1/2\n" )

assert_raise( ArgumentError ) { YAML.load("!ruby/object:Rational INVALID/RATIONAL\n") }

end

def test_ruby_complex

assert_to_yaml( Complex(3, 4), <<EOY )

--- !ruby/object:Complex

image: 4

real: 3

EOY

# Read YAML dumped by the ruby 1.8.3.

assert_to_yaml( Complex(3, 4), "!ruby/object:Complex 3+4i\n" )

assert_raise( ArgumentError ) { YAML.load("!ruby/object:Complex INVALID+COMPLEXi\n") }

end