126 lines
2.8 KiB
Ruby
126 lines
2.8 KiB
Ruby
# This class has dubious semantics and we only have it so that
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# people can write params[:key] instead of params['key']
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# and they get the same value for both keys.
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class HashWithIndifferentAccess < Hash
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def initialize(constructor = {})
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if constructor.is_a?(Hash)
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super()
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update(constructor)
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else
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super(constructor)
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end
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end
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def default(key = nil)
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if key.is_a?(Symbol) && include?(key = key.to_s)
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self[key]
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else
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super
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end
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end
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alias_method :regular_writer, :[]= unless method_defined?(:regular_writer)
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alias_method :regular_update, :update unless method_defined?(:regular_update)
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#
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# Assigns a new value to the hash.
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#
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# Example:
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#
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# hash = HashWithIndifferentAccess.new
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# hash[:key] = "value"
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#
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def []=(key, value)
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regular_writer(convert_key(key), convert_value(value))
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end
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#
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# Updates the instantized hash with values from the second.
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#
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# Example:
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#
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# >> hash_1 = HashWithIndifferentAccess.new
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# => {}
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#
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# >> hash_1[:key] = "value"
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# => "value"
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#
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# >> hash_2 = HashWithIndifferentAccess.new
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# => {}
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#
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# >> hash_2[:key] = "New Value!"
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# => "New Value!"
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#
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# >> hash_1.update(hash_2)
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# => {"key"=>"New Value!"}
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#
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def update(other_hash)
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other_hash.each_pair { |key, value| regular_writer(convert_key(key), convert_value(value)) }
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self
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end
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alias_method :merge!, :update
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# Checks the hash for a key matching the argument passed in
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def key?(key)
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super(convert_key(key))
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end
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alias_method :include?, :key?
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alias_method :has_key?, :key?
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alias_method :member?, :key?
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# Fetches the value for the specified key, same as doing hash[key]
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def fetch(key, *extras)
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super(convert_key(key), *extras)
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end
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# Returns an array of the values at the specified indicies.
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def values_at(*indices)
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indices.collect {|key| self[convert_key(key)]}
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end
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# Returns an exact copy of the hash.
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def dup
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HashWithIndifferentAccess.new(self)
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end
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# Merges the instantized and the specified hashes together, giving precedence to the values from the second hash
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# Does not overwrite the existing hash.
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def merge(hash)
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self.dup.update(hash)
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end
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# Removes a specified key from the hash.
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def delete(key)
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super(convert_key(key))
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end
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def stringify_keys!; self end
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def symbolize_keys!; self end
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def to_options!; self end
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# Convert to a Hash with String keys.
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def to_hash
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Hash.new(default).merge(self)
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end
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protected
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def convert_key(key)
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key.kind_of?(Symbol) ? key.to_s : key
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end
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def convert_value(value)
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case value
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when Hash
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value.with_indifferent_access
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when Array
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value.collect { |e| e.is_a?(Hash) ? e.with_indifferent_access : e }
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else
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value
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end
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end
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end
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