Top Level Namespace

Defined Under Namespace

Modules: Polyfill

Instance Method Summary collapse

Instance Method Details

#Polyfill(options = {}) ⇒ Object

rubocop:disable Style/MethodName



64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
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
 
# File 'lib/polyfill.rb', line 64

def Polyfill(options = {}) # rubocop:disable Style/MethodName
  #
  # parse options
  #
  objects, others = options.partition { |key,| key[/\A[A-Z]/] }
  objects.sort! do |a, b|
    if !a.is_a?(Class) && b.is_a?(Class)
      -1
    elsif a.is_a?(Class) && !b.is_a?(Class)
      1
    else
      0
    end
  end
  objects.each do |object_name, _|
    Object.const_get(object_name.to_s, false)
  end
  others = others.to_h

  versions = Polyfill::InternalUtils.polyfill_versions_to_use(others.delete(:version))
  native = others.delete(:native) { false }

  unless others.empty?
    raise ArgumentError, "unknown keyword: #{others.first[0]}"
  end

  #
  # build the module to return
  #
  Polyfill::InternalUtils.create_module do |mod|
    objects.each do |object_name, methods|
      #
      # find all polyfills for the object across all versions
      #
      modules_with_updates, instance_modules = Polyfill::InternalUtils.modules_to_use(object_name, versions)

      class_modules_with_updates = modules_with_updates.map do |module_with_updates|
        begin
          module_with_updates.const_get(:ClassMethods, false)
        rescue NameError
          nil
        end
      end.compact
      class_modules = instance_modules.map do |module_with_updates|
        begin
          module_with_updates.const_get(:ClassMethods, false).clone
        rescue NameError
          nil
        end
      end.compact

      #
      # get all requested class and instance methods
      #
      if methods != :all && (method_name = methods.find { |method| method !~ /\A[.#]/ })
        raise ArgumentError, %Q("#{method_name}" must start with a "." if it's a class method or "#" if it's an instance method)
      end

      instance_methods, class_methods =
        if methods == :all
          i[all all]
        else
          methods
            .partition { |m| m.start_with?('#') }
            .map { |method_list| method_list.map { |name| name[1..-1].to_sym } }
        end

      requested_instance_methods =
        Polyfill::InternalUtils.methods_to_keep(modules_with_updates, instance_methods, '#', object_name)
      requested_class_methods =
        Polyfill::InternalUtils.methods_to_keep(class_modules_with_updates, class_methods, '.', object_name)

      #
      # get the class(es) to refine
      #
      base_object = object_name.to_s
      base_objects =
        case base_object
        when 'Comparable'
          %w[Numeric String Time]
        when 'Enumerable'
          %w[Array Dir Enumerator Hash IO Matrix Range StringIO Struct Vector]
        when 'Kernel'
          %w[Object]
        else
          [base_object]
        end
      base_objects.select! do |klass|
        begin
          Object.const_get(klass, false)
        rescue NameError
          false
        end
      end

      #
      # refine in class methods
      #
      class_modules.each do |class_module|
        Polyfill::InternalUtils.keep_only_these_methods!(class_module, requested_class_methods)

        next if class_module.instance_methods.empty?

        mod.module_exec(requested_class_methods) do |methods_added|
          base_objects.each do |klass|
            refine Object.const_get(klass, false).singleton_class do
              include class_module

              if native
                Polyfill::InternalUtils.ignore_warnings do
                  define_method :respond_to? do |name, include_all = false|
                    return true if methods_added.include?(name)

                    super(name, include_all)
                  end

                  define_method :__send__ do |name, *args, &block|
                    return super(name, *args, &block) unless methods_added.include?(name)

                    class_module.instance_method(name).bind(self).call(*args, &block)
                  end
                  alias_method :send, :__send__
                end
              end
            end
          end
        end
      end

      #
      # refine in instance methods
      #
      instance_modules.each do |instance_module|
        Polyfill::InternalUtils.keep_only_these_methods!(instance_module, requested_instance_methods)

        next if instance_module.instance_methods.empty?

        mod.module_exec(requested_instance_methods) do |methods_added|
          base_objects.each do |klass|
            refine Object.const_get(klass, false) do
              include instance_module

              if native
                Polyfill::InternalUtils.ignore_warnings do
                  define_method :respond_to? do |name, include_all = false|
                    return super(name, include_all) unless methods_added.include?(name)

                    true
                  end

                  define_method :__send__ do |name, *args, &block|
                    return super(name, *args, &block) unless methods_added.include?(name)

                    instance_module.instance_method(name).bind(self).call(*args, &block)
                  end
                  alias_method :send, :__send__
                end
              end
            end
          end
        end
      end
    end
  end
end