NAME

Data::Sah::Params - (DEPRECATED) Validate function arguments using Sah schemas

VERSION

This document describes version 0.005 of Data::Sah::Params (from Perl distribution Data-Sah-Params), released on 2020-09-25.

SYNOPSIS

use Data::Sah::Params qw(compile Optional Slurpy Named);

# positional parameters, some optional
sub f1 {
    state $check = compile(
        ["str*"],
        ["int*", min=>1, max=>10, default=>5],
        Optional [array => of=>"int*"],
    );
    my ($foo, $bar, $baz) = $check->(@_);
    ...
}
f1();                # dies, missing required argument $foo
f1(undef);           # dies, $foo must not be undef
f1("a");             # dies, missing required argument $bar
f1("a", undef);      # ok, $bar = 5, $baz = undef
f1("a", 1);          # ok, $bar = 1, $baz = undef
f1("a", "x");        # dies, $bar is not an int
f1("a", 3, [1,2,3]); # ok

# positional parameters, slurpy last parameter
sub f2 {
    state $check = compile(
        ["str*"],
        ["int*", min=>1, max=>10, default=>5],
        Slurpy [array => of=>"int*"],
    );
    my ($foo, $bar, $baz) = $check->(@_);
    ...
}
f1("a", 3, 1,2,3);   # ok, $foo="a", $bar=3, $baz=[1,2,3]
f1("a", 3, 1,2,"b"); # dies, third element of $baz not an integer

# named parameters, some optional
sub f3 {
    state $check = compile(Named
        foo => ["str*"],
        bar => ["int*", min=>1, max=>10, default=>5],
        baz => Optional [array => of=>"int*"],
    );
    my $args = $check->(@_);
    ...
}
f1(foo => "a");                 # dies, missing argument 'bar'
f1(foo => "a", bar=>1);         # ok
f1(foo => "a", bar=>1, baz=>2); # dies, baz not an array

DESCRIPTION

DEPRECATION NOTICE. Deprecated in favor of Params::Sah.

Experimental.

Currently mixing positional and named parameters not yet supported.

FUNCTIONS

compile([ \%opts, ] $schema, ...) => coderef

Create a validator. Accepts a list of schemas. Each schema can be prefixed with Optional or Slurpy. Or, if your function will accept named arguments (%args) you can use: Named(PARAM1=>$schema1, PARAM2=>$schema2, ...) instead.

Known options:

• want_source => bool

  If set to 1, will return validator source code string instead of compiled code (coderef). Useful for debugging.

HOMEPAGE

Please visit the project's homepage at https://metacpan.org/release/Data-Sah-Params.

SOURCE

Source repository is at https://github.com/perlancar/perl-Data-Sah-Params.

BUGS

Please report any bugs or feature requests on the bugtracker website https://rt.cpan.org/Public/Dist/Display.html?Name=Data-Sah-Params

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.

SEE ALSO

Params::Sah is now the preferred module over this.

Sah for the schema language.

Similar modules: Type::Params, Params::Validate, Params::CheckCompiler.

If you put your schemas in Rinci function metadata (I recommend it, for the convenience of specifying other stuffs besides argument schemas), take a look at Perinci::Sub::ValidateArgs.

Params::Sah. I've actually implemented something similar the year before (albeit with a slightly different interface), before absent-mindedly reimplemented later :-) We'll see which one will thrive.

AUTHOR

perlancar <perlancar@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2020, 2016 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.