Merge pull request #3904 from ksss/mruby-method

Add mruby-method

mrbgems/mruby-method/README.md

+mruby-method
+===
+
+A implementetion of class **Method** and **UnboundMethod** for mruby
+
+```ruby
+p Enumerable.instance_method(:find_all).source_location
+#=> ["mruby/mruby/mrblib/enum.rb", 148]
+```
+
+# Note
+
+`source_location` method need this configuration in build_config.rb
+
+```ruby
+MRuby::Build.new do |conf|
+  enable_debug
+end
+```
+
+# Supported Methods
+
+## Kernel
+
+- `Kernel#method`
+- `Kernel#singleton_method`
+
+## Module
+
+- `Module#instance_method`
+
+## Method class
+
+- `Method#name`
+- `Method#call`
+- `Method#super_method`
+- `Method#arity`
+- `Method#unbind`
+- `Method#[]`
+- `Method#owner`
+- `Method#receiver`
+- `Method#parameters`
+- `Method#source_location`
+- `Method#to_proc`
+
+## UnboundMethod class
+
+- `UnboundMethod#name`
+- `UnboundMethod#bind`
+- `UnboundMethod#super_method`
+- `UnboundMethod#arity`
+- `UnboundMethod#owner`
+- `UnboundMethod#parameters`
+- `UnboundMethod#source_location`
+
+# See also
+
+- https://ruby-doc.org/core-2.3.3/Method.html
+- https://ruby-doc.org/core-2.3.3/UnboundMethod.html

mrbgems/mruby-method/mrbgem.rake

+MRuby::Gem::Specification.new('mruby-method') do |spec|
+  spec.license = 'MIT'
+  spec.author  = 'mruby developers'
+  spec.summary = 'Method and UnboundMethod class'
+
+  spec.add_dependency('mruby-proc-ext', :core => 'mruby-proc-ext')
+end

mrbgems/mruby-method/mrblib/kernel.rb

+module Kernel
+  def singleton_method(name)
+    m = method(name)
+    if m.owner != singleton_class
+      raise NameError, "undefined method `#{name}' for class `#{singleton_class}'"
+    end
+    m
+  end
+end

mrbgems/mruby-method/mrblib/method.rb

+class Method
+  def to_proc
+    m = self
+    lambda { |*args, &b|
+      m.call(*args, &b)
+    }
+  end
+
+  def owner
+    @owner
+  end
+
+  def receiver
+    @recv
+  end
+
+  def name
+    @name
+  end
+end

mrbgems/mruby-method/mrblib/unbound_method.rb

+class UnboundMethod
+  def owner
+    @owner
+  end
+
+  def name
+    @name
+  end
+end