Method definitions and Line numbers

Ruby
1

Hello,

How does Ruby store where methods are defined?
For example, where does Ruby look to get file names and line numbers in
the
stack trace?

2

On Jan 20, 2006, at 7:37 PM, Brian T. wrote:

http://weblog.freeopinion.org
Check out the FILE and LINE constants.

3

Check out the FILE and LINE constants.

I apologize for not being clear.

Lets say we have a class Test that raises an error.

class Test
def method_with_an_error
raise Error
end
end

t = Test.new
t.method_with_an_error

Now the following error message is outputted in the command line.

/home/btakita/src/scratch3.rb:3:in `method_with_an_error’: Exception
(Exception)
from /home/btakita/src/scratch3.rb:8

How does Ruby keep track where :method_with_an_error is stored?
Can I make a query as to where :method_with_an_error is defined?

4

2006/1/21, Brian T. [email protected]:

    raise Error
from /home/btakita/src/scratch3.rb:8

How does Ruby keep track where :method_with_an_error is stored?
Can I make a query as to where :method_with_an_error is defined?

You mean without it raising an excepption? AFAIK there is no other
way than searching sources for the definition. You can also use $: to
check directories in the load path.

Wait, there might be one other option: use set_trace_func at the
beginning of your script (before the first require) and record all
class and method definitions.

Kind regards

robert

5

I meant to paste this code:

class Test
def method_with_an_error
raise Exception
end
end

t = Test.new
t.method_with_an_error