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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 < Array #:nodoc:
def []=(key, value)
if pair = assoc(key)
pair.pop
pair << value
else
self << [key, value]
end
value
end
def [](key)
pair = assoc(key)
pair ? pair.last : nil
end
def delete(key)
pair = assoc(key)
pair ? array_index = index(pair) : nil
array_index ? delete_at(array_index).last : nil
end
def keys
collect { |key, value| key }
end
def values
collect { |key, value| value }
end
def to_hash
returning({}) do |hash|
each { |array| hash[array[0]] = array[1] }
end
end
def has_key?(k)
!assoc(k).nil?
end
alias_method :key?, :has_key?
alias_method :include?, :has_key?
alias_method :member?, :has_key?
def has_value?(v)
any? { |key, value| value == v }
end
alias_method :value?, :has_value?
end
end
end
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