Module: Memoist
- Defined in:
- lib/memoist.rb,
lib/memoist/version.rb
Defined Under Namespace
Modules: InstanceMethods
Constant Summary collapse
- VERSION =
"0.12.0"
Class Method Summary collapse
- .escape_punctuation(string) ⇒ Object
- .extract_reload!(method, args) ⇒ Object
- .memoist_eval(klass, *args, &block) ⇒ Object
- .memoized_ivar_for(method_name, identifier = nil) ⇒ Object
- .memoized_prefix(identifier = nil) ⇒ Object
- .unmemoized_method_for(method_name, identifier = nil) ⇒ Object
- .unmemoized_prefix(identifier = nil) ⇒ Object
Instance Method Summary collapse
Class Method Details
.escape_punctuation(string) ⇒ Object
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# File 'lib/memoist.rb', line 21 def self.escape_punctuation(string) string.sub(/\?\Z/, '_query').sub(/!\Z/, '_bang') end |
.extract_reload!(method, args) ⇒ Object
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# File 'lib/memoist.rb', line 33 def self.extract_reload!(method, args) if args.length == method.arity.abs + 1 && (args.last == true || args.last == :reload) reload = args.pop end reload end |
.memoist_eval(klass, *args, &block) ⇒ Object
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# File 'lib/memoist.rb', line 25 def self.memoist_eval(klass, *args, &block) if klass.respond_to?(:class_eval) klass.class_eval(*args, &block) else klass.singleton_class.class_eval(*args, &block) end end |
.memoized_ivar_for(method_name, identifier = nil) ⇒ Object
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# File 'lib/memoist.rb', line 5 def self.memoized_ivar_for(method_name, identifier=nil) ["@#{memoized_prefix(identifier)}", escape_punctuation(method_name.to_s)].join("_") end |
.memoized_prefix(identifier = nil) ⇒ Object
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# File 'lib/memoist.rb', line 13 def self.memoized_prefix(identifier=nil) ["_memoized", identifier].compact.join("_") end |
.unmemoized_method_for(method_name, identifier = nil) ⇒ Object
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# File 'lib/memoist.rb', line 9 def self.unmemoized_method_for(method_name, identifier=nil) [unmemoized_prefix(identifier), method_name].join("_").to_sym end |
.unmemoized_prefix(identifier = nil) ⇒ Object
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# File 'lib/memoist.rb', line 17 def self.unmemoized_prefix(identifier=nil) ["_unmemoized", identifier].compact.join("_") end |
Instance Method Details
#memoize(*method_names) ⇒ Object
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# File 'lib/memoist.rb', line 86 def memoize(*method_names) if method_names.last.is_a?(Hash) identifier = method_names.pop[:identifier] end method_names.each do |method_name| unmemoized_method = Memoist.unmemoized_method_for(method_name, identifier) memoized_ivar = Memoist.memoized_ivar_for(method_name, identifier) Memoist.memoist_eval(self) do include InstanceMethods if method_defined?(unmemoized_method) warn "Already memoized #{method_name}" return end alias_method unmemoized_method, method_name if instance_method(method_name).arity == 0 # define a method like this; # def mime_type(reload=true) # skip_cache = reload || !instance_variable_defined?("@_memoized_mime_type") # set_cache = skip_cache && !frozen? # # if skip_cache # value = _unmemoized_mime_type # else # value = @_memoized_mime_type # end # # if set_cache # @_memoized_mime_type = value # end # # value # end module_eval <<-EOS, __FILE__, __LINE__ + 1 def #{method_name}(reload = false) skip_cache = reload || !instance_variable_defined?("#{memoized_ivar}") set_cache = skip_cache && !frozen? if skip_cache value = #{unmemoized_method} else value = #{memoized_ivar} end if set_cache #{memoized_ivar} = value end value end EOS else # define a method like this; # def mime_type(*args) # reload = Memoist.extract_reload!(method(:_unmemoized_mime_type), args) # # skip_cache = reload || !memoized_with_args?(:mime_type, args) # set_cache = skip_cache && !frozen # # if skip_cache # value = _unmemoized_mime_type(*args) # else # value = @_memoized_mime_type[args] # end # # if set_cache # @_memoized_mime_type ||= {} # @_memoized_mime_type[args] = value # end # # value # end module_eval <<-EOS, __FILE__, __LINE__ + 1 def #{method_name}(*args) reload = Memoist.extract_reload!(method(#{unmemoized_method.inspect}), args) skip_cache = reload || !(instance_variable_defined?(#{memoized_ivar.inspect}) && #{memoized_ivar} && #{memoized_ivar}.has_key?(args)) set_cache = skip_cache && !frozen? if skip_cache value = #{unmemoized_method}(*args) else value = #{memoized_ivar}[args] end if set_cache #{memoized_ivar} ||= {} #{memoized_ivar}[args] = value end value end EOS end if private_method_defined?(unmemoized_method) private method_name elsif protected_method_defined?(unmemoized_method) protected method_name end end end # return a chainable method_name symbol if we can method_names.length == 1 ? method_names.first : method_names end |