NAME

Data::Sah::Compiler::perl - Compile Sah schema to Perl code

VERSION

This document describes version 0.917 of Data::Sah::Compiler::perl (from Perl distribution Data-Sah), released on 2024-02-16.

SYNOPSIS

 # see Data::Sah

DESCRIPTION

Derived from Data::Sah::Compiler::Prog.

VARIABLES

$PP => bool

Set default for pp compile argument. Takes precedence over environment DATA_SAH_PP.

$CORE => bool

Set default for core compile argument. Takes precedence over environment DATA_SAH_CORE.

$CORE_OR_PP => bool

Set default for core_or_pp compile argument. Takes precedence over environment DATA_SAH_CORE_OR_PP.

$NO_MODULES => bool

Set default for no_modules compile argument. Takes precedence over environment DATA_SAH_NO_MODULES.

DEVELOPER NOTES

To generate expression code that says "all subexpression must be true", you can do:

 !defined(List::Util::first(sub { blah($_) }, "value", ...))

This is a bit harder to read than:

 !grep { !blah($_) } "value", ...

but has the advantage of the ability to shortcut on the first item that fails.

Similarly, to say "at least one subexpression must be true":

 defined(List::Util::first(sub { blah($_) }, "value", ...))

which can shortcut in contrast to:

 grep { blah($_) } "value", ...

METHODS

new() => OBJ

Compilation data

This subclass adds the following compilation data ($cd).

Keys which contain compilation result:

$c->comment($cd, @args) => STR

Generate a comment. For example, in perl compiler:

 $c->comment($cd, "123"); # -> "# 123\n"

Will return an empty string if compile argument comment is set to false.

$c->compile(%args) => RESULT

Aside from arguments known by the base class (Data::Sah::Compiler::Prog), this class supports these arguments:

• pp

  Bool, default false. If set to true, will avoid the use of XS modules in the generated code and will opt instead to use pure-perl modules.

• core

  Bool, default false. If set to true, will avoid the use of non-core modules in the generated code and will opt instead to use core modules.

• core_or_pp

  Bool, default false. If set to true, will stick to using only core or PP modules in the generated code.

• whitelist_modules

  Array of str. When pp/core/core_or_pp option is set to true, the use of non-appropriate modules will cause failure. However, you can pass a list of modules that are allowed nevertheless.

$c->add_runtime_use($cd, $module [, \@import_terms ])

This is like add_runtime_module(), but indicate that $module needs to be use-d in the generated code (for example, Perl pragmas). Normally if add_runtime_module() is used, the generated code will use require.

If you use $c->add_runtime_use($cd, 'foo'), this code will be generated:

 use foo;

If you use $c->add_runtime_use($cd, 'foo', ["'a'", "'b'", "123"]), this code will be generated:

 use foo ('a', 'b', 123);

If you use $c->add_runtime_use($cd, 'foo', []), this code will be generated:

 use foo ();

The generated statement will be added at the top (top-level lexical scope) and duplicates are ignored. To generate multiple and lexically-scoped use and no statements, e.g. like below, currently you can generate them manually:

 if (blah) {
     no warnings;
     ...
 }

$c->add_runtime_no($cd, $module [, \@import_terms ])

This is the counterpart of add_runtime_use(), to generate no foo statement.

See also: add_runtime_use().

$c->add_sun_module($cd)

Add Scalar::Util::Numeric module, or Scalar::Util::Numeric::PP when pp compile argument is true.

ENVIRONMENT

DATA_SAH_PP => bool

Set default for pp compile argument.

DATA_SAH_CORE => bool

Set default for core compile argument.

DATA_SAH_CORE_OR_PP => bool

Set default for core_or_pp compile argument.

DATA_SAH_NO_MODULES => bool

Set default for no_modules compile argument.

HOMEPAGE

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

SOURCE

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

AUTHOR

perlancar <perlancar@cpan.org>

CONTRIBUTING

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.

COPYRIGHT AND LICENSE

This software is copyright (c) 2024, 2022, 2021, 2020, 2019, 2018, 2017, 2016, 2015, 2014, 2013, 2012 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.

BUGS

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

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.

cpanm Data::Sah

perl -MCPAN -e shell
install Data::Sah