Method definitions and Line numbers

[Brian Takita]

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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?

--
Thank you,
Brian Takita
http://weblog.freeopinion.org

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[Logan Capaldo]

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?

Check out the __FILE__ and __LINE__ constants.

 

[Brian Takita]

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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 =3D 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?

--
Thank you,
Brian Takita
http://weblog.freeopinion.org

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[Brian Takita]

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I meant to paste this code:

class Test
def method_with_an_error
raise Exception
end
end

t =3D Test.new
t.method_with_an_error

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[Gene Tani]

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?

Exception#backtrace is what you want

also can access the stack in:

Kernel#caller
Kernel#set_trace_func

Tracer lib (std lib)

 

[Robert Klemme]

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 =3D 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?

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