142 lines
2.6 KiB
Ruby
142 lines
2.6 KiB
Ruby
# OrderedHash is namespaced to prevent conflicts with other implementations
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module ActiveSupport
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# Hash is ordered in Ruby 1.9!
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if RUBY_VERSION >= '1.9'
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OrderedHash = ::Hash
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else
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class OrderedHash < Hash #:nodoc:
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def initialize(*args, &block)
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super
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@keys = []
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end
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def self.[](*args)
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ordered_hash = new
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if (args.length == 1 && args.first.is_a?(Array))
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args.first.each do |key_value_pair|
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next unless (key_value_pair.is_a?(Array))
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ordered_hash[key_value_pair[0]] = key_value_pair[1]
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end
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return ordered_hash
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end
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unless (args.size % 2 == 0)
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raise ArgumentError.new("odd number of arguments for Hash")
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end
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args.each_with_index do |val, ind|
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next if (ind % 2 != 0)
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ordered_hash[val] = args[ind + 1]
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end
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ordered_hash
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end
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def initialize_copy(other)
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super
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# make a deep copy of keys
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@keys = other.keys
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end
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def []=(key, value)
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@keys << key if !has_key?(key)
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super
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end
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def delete(key)
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if has_key? key
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index = @keys.index(key)
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@keys.delete_at index
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end
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super
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end
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def delete_if
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super
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sync_keys!
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self
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end
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def reject!
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super
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sync_keys!
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self
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end
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def reject(&block)
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dup.reject!(&block)
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end
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def keys
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@keys.dup
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end
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def values
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@keys.collect { |key| self[key] }
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end
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def to_hash
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self
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end
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def to_a
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@keys.map { |key| [ key, self[key] ] }
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end
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def each_key
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@keys.each { |key| yield key }
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end
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def each_value
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@keys.each { |key| yield self[key]}
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end
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def each
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@keys.each {|key| yield [key, self[key]]}
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end
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alias_method :each_pair, :each
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def clear
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super
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@keys.clear
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self
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end
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def shift
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k = @keys.first
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v = delete(k)
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[k, v]
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end
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def merge!(other_hash)
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other_hash.each {|k,v| self[k] = v }
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self
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end
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def merge(other_hash)
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dup.merge!(other_hash)
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end
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# When replacing with another hash, the initial order of our keys must come from the other hash -ordered or not.
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def replace(other)
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super
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@keys = other.keys
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self
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end
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def inspect
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"#<OrderedHash #{super}>"
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end
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private
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def sync_keys!
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@keys.delete_if {|k| !has_key?(k)}
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end
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end
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end
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end
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