The mistake Params::Validate makes is that it doesn't allow you to create what your simple case is.

That's not quite true. There is the validation_options function, which sets per-package defaults. 

Params::Validate::validation_options( 
    normalize_keys => sub { $_[0] =~ s/^-//; lc $_[0] }
);

[download]

You can also define parameter specs up front and re-use them. (Or put them in a config file/module for reuse across an app.)

my %specs_for = (
    foo =>
      # specify a type
      { type => ARRAYREF },

    bar =>
      # specify an interface
      { can => [ 'print', 'flush', 'frobnicate' ] },

    baz =>
      { type => SCALAR,   # a scalar ...
        # ... that is a plain integer ...
        regex => qr/^\d+$/,
        callbacks =>
        { # ... and smaller than 90
          'less than 90' => sub { shift() < 90 },
      },
);

sub wibble {
    my %args = validate( @_, {
       foo => $specs_for{foo},
       bar => $specs_for{baz},
    });
   # ...
}

[download]

So with very little up-front work, you can create re-usable parameter validation specs with a preset default case.

-xdg

Code written by xdg and posted on PerlMonks is public domain. It is provided as is with no warranties, express or implied, of any kind. Posted code may not have been tested. Use of posted code is at your own risk.

In reply to Re^4: RFC named parameter syntactic sugar by xdg
in thread RFC named parameter syntactic sugar by snowhare

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.