Module: Memoist
- Defined in:
- lib/memoist.rb,
lib/memoist/version.rb
Defined Under Namespace
Modules: InstanceMethods Classes: MemoizedMethod
Constant Summary collapse
- VERSION =
"0.15.0"
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
31 32 33 34 35 36 37 38 39 40 41 42 |
# File 'lib/memoist.rb', line 31 def self.escape_punctuation(string) string = string.is_a?(String) ? string.dup : string.to_s return string unless string.end_with?('?'.freeze, '!'.freeze) # A String can't end in both ? and ! if string.sub!(/\?\Z/, '_query'.freeze) else string.sub!(/!\Z/, '_bang'.freeze) end string end |
.extract_reload!(method, args) ⇒ Object
52 53 54 55 56 57 |
# File 'lib/memoist.rb', line 52 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
44 45 46 47 48 49 50 |
# File 'lib/memoist.rb', line 44 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
7 8 9 |
# File 'lib/memoist.rb', line 7 def self.memoized_ivar_for(method_name, identifier=nil) "@#{memoized_prefix(identifier)}_#{escape_punctuation(method_name)}" end |
.memoized_prefix(identifier = nil) ⇒ Object
15 16 17 18 19 20 21 |
# File 'lib/memoist.rb', line 15 def self.memoized_prefix(identifier=nil) if identifier "_memoized_#{identifier}" else "_memoized".freeze end end |
.unmemoized_method_for(method_name, identifier = nil) ⇒ Object
11 12 13 |
# File 'lib/memoist.rb', line 11 def self.unmemoized_method_for(method_name, identifier=nil) "#{unmemoized_prefix(identifier)}_#{method_name}".to_sym end |
.unmemoized_prefix(identifier = nil) ⇒ Object
23 24 25 26 27 28 29 |
# File 'lib/memoist.rb', line 23 def self.unmemoized_prefix(identifier=nil) if identifier "_unmemoized_#{identifier}" else "_unmemoized".freeze end end |
Instance Method Details
#all_memoized_structs ⇒ Object
94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 |
# File 'lib/memoist.rb', line 94 def all_memoized_structs @all_memoized_structs ||= begin structs = memoized_methods.dup # Collect the memoized_methods of ancestors in ancestor order # unless we already have it since self or parents could be overriding # an ancestor method. ancestors.grep(Memoist).each do |ancestor| ancestor.memoized_methods.each do |m| structs << m unless structs.any? {|am| am.memoized_method == m.memoized_method } end end structs end end |
#clear_structs ⇒ Object
110 111 112 |
# File 'lib/memoist.rb', line 110 def clear_structs @all_memoized_structs = nil end |
#memoize(*method_names) ⇒ Object
114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 |
# File 'lib/memoist.rb', line 114 def memoize(*method_names) if method_names.last.is_a?(Hash) identifier = method_names.pop[:identifier] end Memoist.memoist_eval(self) do unless singleton_class.method_defined?(:memoized_methods) def self.memoized_methods @_memoized_methods ||= [] end end 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 mm = MemoizedMethod.new(method_name, memoized_ivar, instance_method(method_name).arity) self.memoized_methods << mm if mm.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 |