NAME
Dist::Zilla::Plugin::Rinci::Validate - Insert argument validator code in
output code
VERSION
This document describes version 0.18 of
Dist::Zilla::Plugin::Rinci::Validate (from Perl distribution
Dist-Zilla-Plugin-Rinci-Validate), released on 2014-09-12.
SYNOPSIS
In dist.ini:
[Rinci::Validate]
In your module:
$SPEC{foo} = {
args => {
arg1 => { schema => ['int*', default=>3] },
arg2 => { },
},
};
sub foo {
my %args = @_;
my $arg1 = $args{arg1}; # VALIDATE_ARG
...
}
output will be something like:
$SPEC{foo} = {
args => {
arg1 => { schema => ['int*', default=>3] },
arg2 => { },
},
};
sub foo {
my %args = @_;
my $arg1 = $args{arg1}; require Scalar::Util::Numeric; my $arg_err; (($arg1 //= 3), 1) && ((defined($arg1)) ? 1 : (($err_arg1 = 'TMPERRMSG: required data not specified'),0)) && ((Scalar::Util::Numeric::isint($arg1)) ? 1 : (($err_arg1 = 'TMPERRMSG: type check failed'),0)); return [400, "Invalid value for arg1: $err_arg1"] if $arg1; # VALIDATE_ARG
...
}
You can also validate all arguments:
sub foo {
my %args = @_; # VALIDATE_ARGS
...
}
DESCRIPTION
This plugin inserts argument validation code into your module source
code, at location marked with "# VALIDATE_ARG" or "# VALIDATE_ARGS".
Validation code is compiled using "Data::Sah" from Sah schemas specified
in "args" property in "Rinci" function metadata in the module.
This plugin detects the more recently developed plugin
Dist::Zilla::Plugin::Rinci::Wrap and will skip running if the latter is
loaded.
USAGE
To validate a single argument, in your module:
sub foo {
my %args = @_;
my $arg1 = $args{arg1}; # VALIDATE_ARG
The significant part that is interpreted by this module is "my $arg1".
Argument name is taken from the lexical variable's name (in this case,
"arg1"). Argument must be defined in the "args" property of the function
metadata. If argument name is different from lexical variable name, then
you need to say:
my $f = $args->{frobnicate}; # VALIDATE_ARG frobnicate
To validate all arguments of the subroutine, you can say:
sub foo {
my %args = @_; # VALIDATE_ARGS
There should only be one VALIDATE_ARGS per subroutine.
If you use this plugin, and you plan to wrap your functions too using
Perinci::Sub::Wrapper (or through Perinci::Access, Perinci::CmdLine,
etc), you might also want to put
"x.perinci.sub.wrapper.disable_validate_args => 1" attribute into your
function metadata, to instruct Perinci::Sub::Wrapper to skip generating
argument validation code when your function is wrapped, as argument
validation is already done by the generated code.
If there is an unvalidated argument, this plugin will emit a warning
notice. To skip validating an argument (silence the warning), you can
use:
sub foo {
my %args = @_;
my $arg1 = $args{arg1}; # NO_VALIDATE_ARG
or:
sub foo {
# NO_VALIDATE_ARGS
FAQ
Rationale for this plugin?
This plugin is an alternative to Perinci::Sub::Wrapper, at least when it
comes to validating arguments. Perinci::Sub::Wrapper can also generate
argument validation code (among other things), but it is done during
runtime and can add to startup overhead (compiling complex schemas for
several subroutines can take up to 100ms or more, on my laptop). Using
this plugin, argument validation code is generated during building of
your distribution.
Using this plugin also makes sure that argument is validated whether
your subroutine is wrapped or not. Using this plugin also avoids
wrapping and adding nest level, if that is not to your liking.
Instead of using this plugin, you can use wrapping either by using
Perinci::Exporter or by calling Perinci::Sub::Wrapper's "wrap_sub"
directly.
But why use Rinci metadata or Sah schema?
In short, adding Rinci metadata to your subroutines allows various tools
to do useful stuffs, relieving you from doing those stuffs manually.
Using Sah schema allows you to write validation code succintly, and
gives you the ability to automatically generate Perl/JavaScript/error
messages from the schema.
See their respective documentation for more details.
But the generated code looks ugly!
Admittedly, yes. Validation source code is formatted as a single long
line to avoid modifying line numbers, which is desirable when debugging
your modules. An option to not compress everything as a single line
might be added in the future.
TODO
* Use PPI instead of fragile regex.
* Option to not compress validator code to a single line.
* Option to configure variable name to store validation ($arg_err).
* Option to reuse code for the same schema.
HOMEPAGE
Please visit the project's homepage at
<https://metacpan.org/release/Dist-Zilla-Plugin-Rinci-Validate>.
SOURCE
Source repository is at
<https://github.com/perlancar/perl-Dist-Zilla-Plugin-Rinci-Validate>.
BUGS
Please report any bugs or feature requests on the bugtracker website
<https://rt.cpan.org/Public/Dist/Display.html?Name=Dist-Zilla-Plugin-Rin
ci-Validate>
When submitting a bug or request, please include a test-file or a patch
to an existing test-file that illustrates the bug or desired feature.
AUTHOR
perlancar <perlancar@cpan.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2014 by perlancar@cpan.org.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.