Sah::Schema::percent - A float
This document describes version 0.013 of Sah::Schema::percent (from Perl distribution Sah-Schemas-Float), released on 2022-10-20.
0 # valid, becomes 0 0.5 # valid, becomes 0.005 5 # valid, becomes 0.05 "5%" # valid, becomes 0.05
To check data against this schema (requires Data::Sah):
use Data::Sah qw(gen_validator); my $validator = gen_validator("percent*"); say $validator->($data) ? "valid" : "INVALID!";
The above schema returns a boolean result (true if data is valid, false if otherwise). To return an error message string instead (empty string if data is valid, a non-empty error message otherwise):
my $validator = gen_validator("percent", {return_type=>'str_errmsg'}); my $errmsg = $validator->($data); # a sample valid data $data = "5%"; my $errmsg = $validator->($data); # => ""
Often a schema has coercion rule or default value, so after validation the validated value is different. To return the validated (set-as-default, coerced, prefiltered) value:
my $validator = gen_validator("percent", {return_type=>'str_errmsg+val'}); my $res = $validator->($data); # [$errmsg, $validated_val] # a sample valid data $data = "5%"; my $res = $validator->($data); # => ["",0.05]
Data::Sah can also create validator that returns a hash of detailed error message. Data::Sah can even create validator that targets other language, like JavaScript, from the same schema. Other things Data::Sah can do: show source code for validator, generate a validator code with debug comments and/or log statements, generate human text from schema. See its documentation for more details.
To validate function parameters against this schema (requires Params::Sah):
use Params::Sah qw(gen_validator); sub myfunc { my @args = @_; state $validator = gen_validator("percent*"); $validator->(\@args); ... }
To specify schema in Rinci function metadata and use the metadata with Perinci::CmdLine (Perinci::CmdLine::Lite) to create a CLI:
# in lib/MyApp.pm package MyApp; our %SPEC; $SPEC{myfunc} = { v => 1.1, summary => 'Routine to do blah ...', args => { arg1 => { summary => 'The blah blah argument', schema => ['percent*'], }, ... }, }; sub myfunc { my %args = @_; ... } 1; # in myapp.pl package main; use Perinci::CmdLine::Any; Perinci::CmdLine::Any->new(url=>'/MyApp/myfunc')->run; # in command-line % ./myapp.pl --help myapp - Routine to do blah ... ... % ./myapp.pl --version % ./myapp.pl --arg1 ...
To create a type constraint and type library from a schema:
package My::Types { use Type::Library -base; use Type::FromSah qw( sah2type ); __PACKAGE__->add_type( sah2type('$sch_name*', name=>'Percent') ); } use My::Types qw(Percent); Percent->assert_valid($data);
This type is basically float, with str_as_percent coerce rule. So the percent sign is optional, but the number is always interpreted as percent, e.g. "1" is interpreted as 1% (0.01).
float
str_as_percent
In general, instead of using this schema, I recommend just using the float type (which by default includes coercion rule to convert from percent notation e.g. '1%' -> 0.01). Use this schema if your argument really needs to be expressed in percents.
Please visit the project's homepage at https://metacpan.org/release/Sah-Schemas-Float.
Source repository is at https://github.com/perlancar/perl-Sah-Schemas-Float.
Sah::Schema::percent_str
perlancar <perlancar@cpan.org>
To contribute, you can send patches by email/via RT, or send pull requests on GitHub.
Most of the time, you don't need to build the distribution yourself. You can simply modify the code, then test via:
% prove -l
If you want to build the distribution (e.g. to try to install it locally on your system), you can install Dist::Zilla, Dist::Zilla::PluginBundle::Author::PERLANCAR, Pod::Weaver::PluginBundle::Author::PERLANCAR, and sometimes one or two other Dist::Zilla- and/or Pod::Weaver plugins. Any additional steps required beyond that are considered a bug and can be reported to me.
This software is copyright (c) 2022, 2020, 2019, 2018 by perlancar <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.
Please report any bugs or feature requests on the bugtracker website https://rt.cpan.org/Public/Dist/Display.html?Name=Sah-Schemas-Float
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.
To install Sah::Schemas::Float, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Sah::Schemas::Float
CPAN shell
perl -MCPAN -e shell install Sah::Schemas::Float
For more information on module installation, please visit the detailed CPAN module installation guide.