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