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# OrderedHash is namespaced to prevent conflicts with other implementations
module ActiveSupport
# Hash is ordered in Ruby 1.9!
if RUBY_VERSION >= '1.9'
OrderedHash = ::Hash
else
class OrderedHash < Hash #:nodoc:
def initialize(*args, &block)
super
@keys = []
end
def []=(key, value)
if !has_key?(key)
@keys << key
end
super
end
def delete(key)
array_index = has_key?(key) && index(key)
if array_index
@keys.delete_at(array_index)
end
super
end
def delete_if
super
sync_keys!
self
end
def reject!
super
sync_keys!
self
end
def reject(&block)
dup.reject!(&block)
end
alias_method :super_keys, :keys
private :super_keys
def keys
@keys
end
def values
@keys.collect { |key| self[key] }
end
def to_hash
Hash.new(self)
end
def each_key
@keys.each { |key| yield key }
end
def each_value
@keys.each { |key| yield self[key]}
end
def each
keys.each {|key| yield [key, self[key]]}
end
private
def sync_keys!
(@keys - super_keys).each { |k| @keys.delete(k) }
end
end
end
end
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