Method: Multimethod::Table#install_method

Defined in:
lib/multimethod/table.rb

#install_method(mod, body, file = nil, line = nil) ⇒ Object

Installs a new Multimethod Method using the multimethod syntax:

class A
  multimethod q{
    def foo(x)
      ...
    end
  }
  multimethod q{
    def foo(A x)
    end
  }
end

Interface to Multimethod::Module mixin multimethod



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# File 'lib/multimethod/table.rb', line 47

def install_method(mod, body, file = nil, line = nil)
  file ||= __FILE__
  line ||= __LINE__
  verbose = nil
  #if body =~ /def bar\(x, y\)/
  #  verbose = 1
  #end

  # Parse the signature from the method body
  signature = Signature.new
  signature.mod = mod
  signature.verbose = verbose
  signature.file = file
  signature.line = line
  new_body = signature.scan_string(body.clone)
  
  # Get our Multimethod for this
  mm = lookup_multimethod(signature.name)
  mm.install_dispatch(mod)
  m = mm.new_method_from_signature(signature)

  # Replace the multimethod signature with a plain Ruby signature.
  new_body = m.to_ruby_def + new_body

  #if true || m.signature.restarg
  #   $stderr.puts "install_method(#{mod}) => #{m.to_ruby_signature}:\n#{new_body}"
  #end

  # Evaluate the new method body.     
  mod.module_eval(new_body, file, line)
end