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ff54193c83
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@25084 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
92 lines
3 KiB
Ruby
92 lines
3 KiB
Ruby
# -*- mode: ruby; ruby-indent-level: 4; tab-width: 4 -*- vim: sw=4 ts=4
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# $Id$
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#
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# = yaml/tag.rb: methods for associating a taguri to a class.
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#
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# Author:: why the lucky stiff
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#
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module YAML
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# A dictionary of taguris which map to
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# Ruby classes.
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@@tagged_classes = {}
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#
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# Associates a taguri _tag_ with a Ruby class _cls_. The taguri is used to give types
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# to classes when loading YAML. Taguris are of the form:
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#
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# tag:authorityName,date:specific
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#
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# The +authorityName+ is a domain name or email address. The +date+ is the date the type
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# was issued in YYYY or YYYY-MM or YYYY-MM-DD format. The +specific+ is a name for
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# the type being added.
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#
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# For example, built-in YAML types have 'yaml.org' as the +authorityName+ and '2002' as the
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# +date+. The +specific+ is simply the name of the type:
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#
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# tag:yaml.org,2002:int
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# tag:yaml.org,2002:float
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# tag:yaml.org,2002:timestamp
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#
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# The domain must be owned by you on the +date+ declared. If you don't own any domains on the
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# date you declare the type, you can simply use an e-mail address.
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#
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# tag:why@ruby-lang.org,2004:notes/personal
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#
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def YAML.tag_class( tag, cls )
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if @@tagged_classes.has_key? tag
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warn "class #{ @@tagged_classes[tag] } held ownership of the #{ tag } tag"
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end
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@@tagged_classes[tag] = cls
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end
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# Returns the complete dictionary of taguris, paired with classes. The key for
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# the dictionary is the full taguri. The value for each key is the class constant
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# associated to that taguri.
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#
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# YAML.tagged_classes["tag:yaml.org,2002:int"] => Integer
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#
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def YAML.tagged_classes
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@@tagged_classes
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end
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end
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class Module
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# :stopdoc:
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# Adds a taguri _tag_ to a class, used when dumping or loading the class
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# in YAML. See YAML::tag_class for detailed information on typing and
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# taguris.
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def yaml_as( tag, sc = true )
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verbose, $VERBOSE = $VERBOSE, nil
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class_eval <<-"END", __FILE__, __LINE__+1
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attr_writer :taguri
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def taguri
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if respond_to? :to_yaml_type
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YAML::tagurize( to_yaml_type[1..-1] )
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else
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return @taguri if defined?(@taguri) and @taguri
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tag = #{ tag.dump }
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if self.class.yaml_tag_subclasses? and self.class != YAML::tagged_classes[tag]
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tag = "\#{ tag }:\#{ self.class.yaml_tag_class_name }"
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end
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tag
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end
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end
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def self.yaml_tag_subclasses?; #{ sc ? 'true' : 'false' }; end
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END
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YAML::tag_class tag, self
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ensure
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$VERBOSE = verbose
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end
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# Transforms the subclass name into a name suitable for display
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# in a subclassed tag.
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def yaml_tag_class_name
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self.name
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end
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# Transforms the subclass name found in the tag into a Ruby
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# constant name.
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def yaml_tag_read_class( name )
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name
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end
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# :startdoc:
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end
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