forwardable/impl.rb

* lib/forwardable/impl.rb (_valid_method?, _compile_method):
  extract to separate implementation specific part.
  [ruby-core:78138] [Bug #12938]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56848 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/forwardable/impl.rb

@@ -0,0 +1,24 @@
+# :stopdoc:
+module Forwardable
+  FILE_REGEXP = %r"#{Regexp.quote(File.dirname(__FILE__))}"
+  FILTER_EXCEPTION = <<-'END'
+
+        rescue ::Exception
+          $@.delete_if {|s| ::Forwardable::FILE_REGEXP =~ s} unless ::Forwardable::debug
+          ::Kernel::raise
+  END
+
+  def self._valid_method?(method)
+    catch {|tag|
+      eval("BEGIN{throw tag}; ().#{method}", binding, __FILE__, __LINE__)
+    }
+  rescue SyntaxError
+    false
+  else
+    true
+  end
+
+  def self._compile_method(src, file, line)
+    eval(src, nil, file, line)
+  end
+end