announcing Smerl: Simple Erlang Metaprogramming library

Yariv Sadan <>
Tue Aug 15 06:25:57 CEST 2006


You mean the original rdbms_codegen module?

You can see it here:

http://jungerl.cvs.sourceforge.net/jungerl/jungerl/lib/rdbms/src/rdbms_codegen.erl?revision=1.1&view=markup



On 8/15/06, Ryan Rawson <> wrote:
> is there a svn interface for the jungerl code?
>
> -ryan
>
>
> On 8/14/06, Yariv Sadan <> wrote:
> > FYI, I just added a function called has_func for querying whether a
> > module has a given function.
> >
> > Enjoy
> >
> > Yariv
> >
> > On 8/14/06, Yariv Sadan <> wrote:
> > > Hi,
> > >
> > > Digging through Ulf Wiger's rdbms_codegen.erl module in Jungerl, I
> > > discovered Erlang's wonderful capabilities for runtime code generation
> > > and manipulation. As great as these capabilities are, I think they are
> > > far from obvious to the non-expert programmer. That's why I created
> > > Smerl, simple library for (runtime) Erlang metaprogramming.
> > >
> > > To read more about Smerl and to download it, visit my blog:
> > > https://yarivsblog.com/articles/2006/08/14/smerl-simple-metaprogramming-for-erlang.
> > >
> > > Here's a direct download link:
> > > https://yarivsblog.com/files/smerl.erl
> > >
> > > Here's a quick example of how to use Smerl:
> > >
> > > test_smerl() ->
> > >   C1 = smerl:new(foo).
> > >   {ok, C2} = smerl:add_func(C1, "bar() -> 1 + 1.").
> > >   smerl:compile(C2),
> > >   foo:bar().   % returns 2
> > >
> > > Smerl also lets you work with abstract Erlang forms. The 3rd line of
> > > the above example can be rewritten as
> > >
> > > {ok,C2} = smerl:add_func(C1, {function,1,bar,0,
> > >            [{clause,1,[],[],
> > >              [{op,1,'+',{integer,1,1},{integer,1,1}}]}]).
> > >
> > > Smerl allows you to both create new module in runtime and to
> > > manipulate existing modules by adding and removing functions.
> > >
> > > If you have any comments, problems or suggestions, please let me know!
> > >
> > > Best regards,
> > > Yariv
> > >
> >
>



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