87 lines
1.9 KiB
Ruby
87 lines
1.9 KiB
Ruby
# --
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# Copyright (C) 2008-2009 10gen Inc.
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#
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU Affero General Public License, version 3, as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License
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# for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# ++
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# A hash in which the order of keys are preserved.
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#
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# Under Ruby 1.9 and greater, this class has no added methods because Ruby's
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# Hash already keeps its keys ordered by order of insertion.
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class OrderedHash < Hash
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# We only need the body of this class if the RUBY_VERSION is before 1.9
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if RUBY_VERSION < '1.9'
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attr_accessor :ordered_keys
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def keys
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@ordered_keys || []
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end
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def []=(key, value)
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@ordered_keys ||= []
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@ordered_keys << key unless @ordered_keys.include?(key)
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super(key, value)
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end
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def each
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@ordered_keys ||= []
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@ordered_keys.each { |k| yield k, self[k] }
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end
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def values
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collect { |k, v| v }
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end
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def merge(other)
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oh = self.dup
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oh.merge!(other)
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oh
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end
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def merge!(other)
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@ordered_keys ||= []
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@ordered_keys += other.keys # unordered if not an OrderedHash
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@ordered_keys.uniq!
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super(other)
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end
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def inspect
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str = '{'
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str << (@ordered_keys || []).collect { |k| "\"#{k}\"=>#{self.[](k).inspect}" }.join(", ")
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str << '}'
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end
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def delete(key, &block)
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@ordered_keys.delete(key) if @ordered_keys
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super
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end
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def delete_if(&block)
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self.each { |k,v|
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if yield k, v
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delete(k)
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end
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}
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end
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def clear
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super
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@ordered_keys = []
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end
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end # Ruby before 1.9
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end
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