136 lines
2.8 KiB
Ruby
136 lines
2.8 KiB
Ruby
# --
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# Copyright (C) 2008-2009 10gen Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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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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def ==(other)
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begin
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!other.nil? &&
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keys == other.keys &&
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values == other.values
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rescue
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false
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end
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end
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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 self.[] *args
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oh = OrderedHash.new
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if Hash === args[0]
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oh.merge! args[0]
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elsif (args.size % 2) != 0
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raise ArgumentError, "odd number of elements for Hash"
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else
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0.step(args.size - 1, 2) do |key|
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value = key + 1
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oh[args[key]] = args[value]
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end
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end
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oh
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end
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def initialize(*a, &b)
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super
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@ordered_keys = []
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end
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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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self
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end
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alias :each_pair :each
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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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alias :update :merge!
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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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def hash
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code = 17
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each_pair do |key, value|
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code = 37 * code + key.hash
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code = 37 * code + value.hash
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end
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code
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end
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def eql?(o)
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if o.instance_of? OrderedHash
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self.hash == o.hash
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else
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false
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end
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end
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end
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end
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