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=begin copyright
reg - the ruby extended grammar
Copyright (C) 2005 Caleb Clausen

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
=end


module Kernel
private
  def trace_during(traces)
    if Proc===traces
      handler=traces
      traces=nil
    else
      handler=proc { |*stuff|
        traces<<[stuff<<Thread.current] unless
          %r'[/\\:]trace\.rb$'===file
      }
    end

    #what does it return? inquiring minds want to know -- just the proc it was given!
    set_trace_func handler
    #there's no appearent way to get the previous trace handler... phooey
    begin
      result=yield
    ensure
      #attempt to remain debuggable while restoring the old trace func
      set_trace_func(
        (defined? DEBUGGER__ and (DEBUGGER__.context.method:trace_func).to_proc)
      )
    end
    result
  end
end
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