Joel VanderWerf
2/3/2006 8:11:00 PM
Hey, _why, what do you think about allowing YAML to dump/load Class and
Module objects rather than gagging? I've posted code like the following
(different versions for 1.8.2 and 1.8.4) several times in response to
inquiries on ruby-talk, and found it useful myself.
=====================================================
Test code:
enum_y = [Enumerable, Comparable, String, File].to_yaml
puts enum_y
p YAML.load(enum_y)
=====================================================
Test output:
---
- !ruby/module Enumerable
- !ruby/module Comparable
- !ruby/class String
- !ruby/class File
[Enumerable, Comparable, String, File]
=====================================================
require 'yaml'
if defined?(YAML.type_tag) # old version of YAML
class Module
def is_complex_yaml?
false
end
def to_yaml( opts = {} )
YAML::quick_emit( nil, opts ) { |out|
out << "!ruby/module "
self.name.to_yaml( :Emitter => out )
}
end
end
YAML.add_ruby_type(/^module/) do |type, val|
subtype, subclass = YAML.read_type_class(type, Module)
val.split(/::/).inject(Object) { |p, n| p.const_get(n)}
end
class Class
def to_yaml( opts = {} )
YAML::quick_emit( nil, opts ) { |out|
out << "!ruby/class "
self.name.to_yaml( :Emitter => out )
}
end
end
YAML.add_ruby_type(/^class/) do |type, val|
subtype, subclass = YAML.read_type_class(type, Class)
val.split(/::/).inject(Object) { |p, n| p.const_get(n)}
end
else
class Module
yaml_as "tag:ruby.yaml.org,2002:module"
def Module.yaml_new( klass, tag, val )
if String === val
val.split(/::/).inject(Object) {|m, n| m.const_get(n)}
else
raise YAML::TypeError, "Invalid Module: " + val.inspect
end
end
def to_yaml( opts = {} )
YAML::quick_emit( nil, opts ) { |out|
out.scalar( "tag:ruby.yaml.org,2002:module", self.name, :plain )
}
end
end
class Class
yaml_as "tag:ruby.yaml.org,2002:class"
def Class.yaml_new( klass, tag, val )
if String === val
val.split(/::/).inject(Object) {|m, n| m.const_get(n)}
else
raise YAML::TypeError, "Invalid Class: " + val.inspect
end
end
def to_yaml( opts = {} )
YAML::quick_emit( nil, opts ) { |out|
out.scalar( "tag:ruby.yaml.org,2002:class", self.name, :plain )
}
end
end
end
--
vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407