[erlang-questions] Analysing an Erlang file

Torben Hoffmann <>
Wed Jun 17 16:35:52 CEST 2009


"This should get you started..." - it is virtually the whole solution! You
have totally spoiled my learning opportunity!!! ;-)

I will have my analyser done in no time now - thanks!!!

Cheers,
Torben

On Wed, Jun 17, 2009 at 4:10 PM, Joe Armstrong <> wrote:

> This should get you started ...
>
> Use epp:file to parse the erlang, then a list comprehension to yank
> out the stuff you
> are interested in.
>
> Like this:
>
> test() ->
>    {ok, L} = epp:parse_file("elib1_misc.erl",[],[]),
>    [{{Name,Arity},length(Clauses)} || {function,_,Name,Arity,Clauses} <-
> L].
>
> > test().
> [{{test,0},1},
>  {{added_files,2},1},
>  {{complete,2},1},
>  {{dos2unix,1},3},
>  {{downcase_char,1},2},
>  {{downcase_str,1},1},
>  {{dump,2},1},
>  {{duplicates,1},1},
>  {{duplicates,2},4},
>  ...
>
> This is a bit "quick and dirty" since you need to know the internal
> syntax of the abstract forms -
>
> I suggest you define
>
> dump(File, Term) ->
>    Out = File ++ ".tmp",
>    io:format("** dumping to ~s~n",[Out]),
>    {ok, S} = file:open(Out, [write]),
>    io:format(S, "~p.~n",[Term]),
>    file:close(S).
>
> then evaluate
>
> dump("foo", epp:parse_file(File, [], [])).
>
> Then stare hard at foo.tmp and all the secrets of the Erlang masters
> will be revealed :-)
>
> (note dump/2 is *very* useful for inspecting large data structures - I
> use it all the time)
>
>
>
> /Joe
>
>
>
> On Wed, Jun 17, 2009 at 12:00 AM, Torben
> Hoffmann<> wrote:
> > Thanks to both Christian and Ricard for pointing out the epp_dodger
> module -
> > it has exactly what I need!
> >
> > I have been reading the erl_syntax documentation and it is definitely
> what I
> > need to use... I just couldn't get started.
> >
> > Cheers,
> > Torben
> >
> > On Tue, Jun 16, 2009 at 11:02 PM, Richard Carlsson <
> >wrote:
> >
> >> Torben Hoffmann wrote:
> >>
> >>> Or should I approach this problem from a different angle?
> >>>
> >>
> >> I suggest you read up on the syntax_tools application, mainly
> >> the erl_syntax module and the epp_dodger module; the latter
> >> lets you parse most source files, even those that contain include
> >> directives, macros, and other preprocessor features. The former
> >> (and the erl_syntax_lib companion module) make it a lot easier to
> >> handle the parsed syntax trees.
> >>
> >>    /Richard
> >>
> >
> >
> >
> > --
> > http://www.linkedin.com/in/torbenhoffmann
> >
>



-- 
http://www.linkedin.com/in/torbenhoffmann


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