[librecat-dev] convenience emit function

[Klee, Carsten]

Hi Nicolas!

This seems to limit the fix I want to create to return just a value, right? But I want to emit code in the end. Can I use this within a ‘emit’ function?

Cheers!

Carsten

Von: Nicolas Steenlant [mailto:Nicolas.Steenlant at UGent.be]
Gesendet: Freitag, 2. Juni 2017 09:48
An: Klee, Carsten
Betreff: Re: [librecat-dev] convenience emit function

Hi Carsten,

you can base your fix on this role for this common case:

https://github.com/LibreCat/Catmandu/blob/master/lib/Catmandu/Fix/SimpleGetValue.pm

Regards,
Nicolas

--
Nicolas Steenlant
software developer at University Library Ghent

On 2 Jun 2017, at 09:42, Klee, Carsten <Carsten.Klee at sbb.spk-berlin.de<mailto:Carsten.Klee at sbb.spk-berlin.de>> wrote:

Hi Catmanduers again!

I’m not sure that this is reasonable. But for me it seems like, when creating a fix, you have recurrent tasks like “get me a value from a given path”, “set a value for a given path” or “delete value for a given path”.

To achieve this you always have to write code like:

my $my_var  = $fixer->generate_var;
my $perl         = $fixer->emit_declare_vars($my_var );
my $path        = $fixer->split_path( $self->path );
my $key          = pop @$path;
$perl .=
            $fixer->emit_walk_path($fixer->var, $path, sub {
            my $var = shift;
            $fixer->emit_get_key($var, $key, sub {
                my $var = shift;
                "if (is_string(${var})) {" .
                    "${my_var} = ${var};" .
                "}";
            });

But wouldn’t it be more convenient (and less error prone) to provide functions for such recurrent tasks? Like

my $perl = $fixer->emit_get_string(‘my_var’, $path, $fixer->var);

which should do the same like the code above. Or

my $perl = $fixer->emit_get_value(‘my_var’, $path, $fixer->var);

which also should do the same, but without the ‘is_string’ check. And the same for emit_set_* and emit_delete_*.

Cheers!

Carsten
---
Carsten Klee
Zeitschriftendatenbank (ZDB)
Staatsbibliothek zu Berlin – Preußischer Kulturbesitz

Potsdamer Straße 33
10785 Berlin

Tel.:   +49 30 266-43 44 02
Fax:    +49 30 266-33 44 01
carsten.klee at sbb.spk-berlin.de<mailto:carsten.klee at sbb.spk-berlin.de>
www.staatsbibliothek-berlin.de<http://www.staatsbibliothek-berlin.de/>

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