44 lines
1.1 KiB
Ruby
44 lines
1.1 KiB
Ruby
# --
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# Copyright (C) 2008 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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class OrderedHash < Hash
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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 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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super(other)
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end
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end
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