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# -*- mode: ruby; ruby-indent-level: 4; tab-width: 4 -*- vim: sw=4 ts=4
# $Id: tag.rb 16084 2008-04-19 11:45:39Z knu $
#
# = yaml/tag.rb: methods for associating a taguri to a class.
#
# Author:: why the lucky stiff
#
module YAML
# A dictionary of taguris which map to
# Ruby classes.
@@tagged_classes = {}
#
# Associates a taguri _tag_ with a Ruby class _cls_. The taguri is used to give types
# to classes when loading YAML. Taguris are of the form:
#
# tag:authorityName,date:specific
#
# The +authorityName+ is a domain name or email address. The +date+ is the date the type
# was issued in YYYY or YYYY-MM or YYYY-MM-DD format. The +specific+ is a name for
# the type being added.
#
# For example, built-in YAML types have 'yaml.org' as the +authorityName+ and '2002' as the
# +date+. The +specific+ is simply the name of the type:
#
# tag:yaml.org,2002:int
# tag:yaml.org,2002:float
# tag:yaml.org,2002:timestamp
#
# The domain must be owned by you on the +date+ declared. If you don't own any domains on the
# date you declare the type, you can simply use an e-mail address.
#
# tag:why@ruby-lang.org,2004:notes/personal
#
def YAML.tag_class( tag, cls )
if @@tagged_classes.has_key? tag
warn "class #{ @@tagged_classes[tag] } held ownership of the #{ tag } tag"
end
@@tagged_classes[tag] = cls
end
# Returns the complete dictionary of taguris, paired with classes. The key for
# the dictionary is the full taguri. The value for each key is the class constant
# associated to that taguri.
#
# YAML.tagged_classes["tag:yaml.org,2002:int"] => Integer
#
def YAML.tagged_classes
@@tagged_classes
end
end
class Module
# :stopdoc:
# Adds a taguri _tag_ to a class, used when dumping or loading the class
# in YAML. See YAML::tag_class for detailed information on typing and
# taguris.
def yaml_as( tag, sc = true )
verbose, $VERBOSE = $VERBOSE, nil
class_eval <<-"end;", __FILE__, __LINE__+1
attr_writer :taguri
def taguri
if respond_to? :to_yaml_type
YAML::tagurize( to_yaml_type[1..-1] )
else
return @taguri if defined?(@taguri) and @taguri
tag = #{ tag.dump }
if self.class.yaml_tag_subclasses? and self.class != YAML::tagged_classes[tag]
tag = "\#{ tag }:\#{ self.class.yaml_tag_class_name }"
end
tag
end
end
def self.yaml_tag_subclasses?; #{ sc ? 'true' : 'false' }; end
end;
YAML::tag_class tag, self
ensure
$VERBOSE = verbose
end
# Transforms the subclass name into a name suitable for display
# in a subclassed tag.
def yaml_tag_class_name
self.name
end
# Transforms the subclass name found in the tag into a Ruby
# constant name.
def yaml_tag_read_class( name )
name
end
end
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