7600aef48b
As a side benefit, fix an (non-user-visible) bug in display_s5(). Also fixed a bug where removing orphaned pages did not expire cached summary pages.
75 lines
2.2 KiB
Ruby
75 lines
2.2 KiB
Ruby
class Object
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# Available in 1.8.6 and later.
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unless respond_to?(:instance_variable_defined?)
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def instance_variable_defined?(variable)
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instance_variables.include?(variable.to_s)
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end
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end
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# Returns a hash that maps instance variable names without "@" to their
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# corresponding values. Keys are strings both in Ruby 1.8 and 1.9.
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#
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# class C
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# def initialize(x, y)
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# @x, @y = x, y
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# end
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# end
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#
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# C.new(0, 1).instance_values # => {"x" => 0, "y" => 1}
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def instance_values #:nodoc:
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instance_variables.inject({}) do |values, name|
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values[name.to_s[1..-1]] = instance_variable_get(name)
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values
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end
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end
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# Returns an array of instance variable names including "@". They are strings
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# both in Ruby 1.8 and 1.9.
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#
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# class C
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# def initialize(x, y)
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# @x, @y = x, y
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# end
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# end
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#
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# C.new(0, 1).instance_variable_names # => ["@y", "@x"]
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if RUBY_VERSION >= '1.9'
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def instance_variable_names
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instance_variables.map { |var| var.to_s }
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end
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else
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alias_method :instance_variable_names, :instance_variables
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end
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# Copies the instance variables of +object+ into +self+.
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#
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# Instance variable names in the +exclude+ array are ignored. If +object+
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# responds to <tt>protected_instance_variables</tt> the ones returned are
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# also ignored. For example, Rails controllers implement that method.
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#
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# In both cases strings and symbols are understood, and they have to include
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# the at sign.
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#
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# class C
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# def initialize(x, y, z)
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# @x, @y, @z = x, y, z
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# end
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#
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# def protected_instance_variables
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# %w(@z)
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# end
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# end
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#
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# a = C.new(0, 1, 2)
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# b = C.new(3, 4, 5)
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#
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# a.copy_instance_variables_from(b, [:@y])
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# # a is now: @x = 3, @y = 1, @z = 2
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def copy_instance_variables_from(object, exclude = []) #:nodoc:
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exclude += object.protected_instance_variables if object.respond_to? :protected_instance_variables
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vars = object.instance_variables.map(&:to_s) - exclude.map(&:to_s)
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vars.each { |name| instance_variable_set(name, object.instance_variable_get(name)) }
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end
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end
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