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- # Copyright (c) 2013 Douglas Thrift
- #
- # MIT License
- #
- # Permission is hereby granted, free of charge, to any person obtaining
- # a copy of this software and associated documentation files (the
- # "Software"), to deal in the Software without restriction, including
- # without limitation the rights to use, copy, modify, merge, publish,
- # distribute, sublicense, and/or sell copies of the Software, and to
- # permit persons to whom the Software is furnished to do so, subject to
- # the following conditions:
- #
- # The above copyright notice and this permission notice shall be
- # included in all copies or substantial portions of the Software.
- #
- # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
- # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
- # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- require 'set'
- module MachineTag
- # Set of tags which can be machine tags.
- #
- class Set < ::Set
- # The tags in the set which are not machine tags
- #
- # @return [::Set<Tag>] the tags in the set which are not machine tags
- #
- attr_reader :plain_tags
- # The tags in the set which are machine tags
- #
- # @return [::Set<Tag>] the tags in the set which are machine tags
- #
- attr_reader :machine_tags
- # Creates a set of tags which can be machine tags. If String objects are passed in they will be
- # converted to {Tag}.
- #
- # @param enum [Enumerable<Tag, String>, nil] the enumerable object of tags
- # @param block [Proc] the optional block to preprocess elements before inserting them
- #
- def initialize(enum = nil, &block)
- @plain_tags = ::Set.new
- @machine_tags = ::Set.new
- @tags_by_namespace = {}
- @tags_by_namespace_and_predicate = {}
- super
- end
- # Adds a tag to the set of tags. If a String object is passed in it will be converted to {Tag}.
- #
- # @param tag [Tag, String] the tag or string to add
- #
- # @return [Set] the tag set
- #
- def add(tag)
- tag = Tag.new(tag) unless tag.is_a? Tag
- super(tag)
- if tag.machine_tag?
- @machine_tags << tag
- @tags_by_namespace[tag.namespace] ||= ::Set.new
- @tags_by_namespace[tag.namespace] << tag
- @tags_by_namespace_and_predicate[tag.namespace_and_predicate] ||= ::Set.new
- @tags_by_namespace_and_predicate[tag.namespace_and_predicate] << tag
- else
- @plain_tags << tag
- end
- self
- end
- alias_method :<<, :add
- # Retrieves machine tags in the Set with a matching namespace or namespace and predicate.
- #
- # @example
- # tags = MachineTag::Set['a:b=x', 'a:b=y', 'a:c=z']
- # tags['a'] # => #<Set: {"a:b=x", "a:b=y", "a:c=z"}>
- # tags['a', 'b'] # => #<Set: {"a:b=x", "a:b=y"}>
- # tags['a:c'] # => #<Set: {"a:c=z"}>
- # tags['a', /^[bc]$/] # => #<Set: {"a:b=x", "a:b=y", "a:c=z"}>
- # tags[/^a:[bc]$/] # => #<Set: {"a:b=x", "a:b=y", "a:c=z"}>
- #
- # @param namespace_or_namespace_and_predicate [String, Regexp] the namespace to retrieve or the namespace
- # and predicate to retreive combined in a string separated by +':'+
- # @param predicate [String, Regexp, nil] the predicate to retreive
- #
- # @return [::Set<Tag>] the machines tags that have the given namespace or namespace and predicate
- #
- def [](namespace_or_namespace_and_predicate, predicate = nil)
- case namespace_or_namespace_and_predicate
- when Regexp
- tags = @machine_tags.select do |machine_tag|
- machine_tag.namespace =~ namespace_or_namespace_and_predicate ||
- machine_tag.namespace_and_predicate =~ namespace_or_namespace_and_predicate
- end
- case predicate
- when nil
- when Regexp
- tags.select! { |machine_tag| machine_tag.predicate =~ predicate }
- else
- raise ArgumentError, "Invalid machine tag predicate: #{predicate.inspect}" unless predicate =~ /^#{PREFIX}$/
- tags.select! { |machine_tag| machine_tag.predicate == predicate }
- end
- ::Set.new tags
- else
- if namespace_or_namespace_and_predicate =~ /^#{PREFIX}$/
- namespace = namespace_or_namespace_and_predicate
- unless predicate
- @tags_by_namespace[namespace]
- else
- case predicate
- when Regexp
- ::Set.new @tags_by_namespace[namespace].select { |machine_tag| machine_tag.predicate =~ predicate }
- else
- raise ArgumentError, "Invalid machine tag predicate: #{predicate.inspect}" unless predicate =~ /^#{PREFIX}$/
- @tags_by_namespace_and_predicate["#{namespace}:#{predicate}"]
- end
- end
- elsif namespace_or_namespace_and_predicate =~ /^#{NAMESPACE_AND_PREDICATE}$/
- namespace_and_predicate = namespace_or_namespace_and_predicate
- raise ArgumentError, "Separate predicate passed with namespace and predicate: #{namespace_and_predicate.inspect}, #{predicate.inspect}" if predicate
- @tags_by_namespace_and_predicate[namespace_and_predicate]
- else
- raise ArgumentError, "Invalid machine tag namespace and/or predicate: #{namespace_or_namespace_and_predicate.inspect}, #{predicate.inspect}"
- end
- end
- end
- end
- end
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