From: Ned Konz <ned@...>
Date: 2001-09-21T14:07:55+09:00
Subject: [ruby-talk:21478] proposal: add Method reflection for source line, filename

I've been using the rbbr (Ruby browser), and have enjoyed it. However, coming 
from a Smalltalk background, I miss seeing the source code (when it exists).

So I added these two methods to eval.c to provide for source file name and 
lien number:

===================================================================
RCS file: /src/ruby/eval.c,v
retrieving revision 1.206
diff -c -r1.206 eval.c
*** eval.c	2001/09/20 12:51:58	1.206
--- eval.c	2001/09/21 04:59:51
***************
*** 6913,6918 ****
--- 6913,6942 ----
      return str;
  }
  
+ /* NK: added */
+ 
+ static VALUE
+ method_source_file_name(VALUE method)
+ {
+     struct METHOD *data;
+     const char *filename;
+ 
+     Data_Get_Struct(method, struct METHOD, data);
+     filename = data->body->nd_file;
+     return rb_str_buf_new2( filename == NULL ? "" : filename );
+ }
+ 
+ static VALUE
+ method_source_line(VALUE method)
+ {
+     struct METHOD *data;
+ 
+     Data_Get_Struct(method, struct METHOD, data);
+     return INT2FIX( nd_line(data->body) );
+ }
+ 
+ /* NK: end */
+ 
  static VALUE
  mproc()
  {
***************
*** 7027,7032 ****
--- 7051,7058 ----
      rb_define_method(rb_cMethod, "arity", method_arity, 0);
      rb_define_method(rb_cMethod, "inspect", method_inspect, 0);
      rb_define_method(rb_cMethod, "to_s", method_inspect, 0);
+     rb_define_method(rb_cMethod, "source_file_name", 
method_source_file_name, 0); /* NK */
+     rb_define_method(rb_cMethod, "source_line", method_source_line, 0); /* 
NK */
      rb_define_method(rb_cMethod, "to_proc", method_proc, 0);
      rb_define_method(rb_cMethod, "unbind", method_unbind, 0);
      rb_define_method(rb_mKernel, "method", rb_obj_method, 1);
=============

I have no idea whether this is a good thing to add, but it certainly makes it 
easier for a Ruby browser to work. This could have been a single method that 
returned an Array, as well, I suppose.

What do you think? Is this something worth adding to Ruby?

This is my first Ruby C extension; please tell me if I did something wrong. 
BTW, the Ruby source is SO much nicer than Perl's!

Thanks,
-- 
Ned Konz
currently: Stanwood, WA
email:     ned@bike-nomad.com
homepage:  http://bike-nomad.com