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NAME
====

Raku port of Perl's hex() / oct() built-ins

SYNOPSIS
========

```raku
use P5hex; # exports hex() and oct()

print hex '0xAf'; # prints '175'
print hex 'aF';   # same

$val = oct($val) if $val =~ /^0/;
```

DESCRIPTION
===========

This module tries to mimic the behaviour of Perl's `hex` and `oct` built-ins as closely as possible in the Raku Programming Language.

ORIGINAL PERL 5 DOCUMENTATION
=============================

    hex EXPR
    hex     Interprets EXPR as a hex string and returns the corresponding
            value. (To convert strings that might start with either 0, "0x",
            or "0b", see "oct".) If EXPR is omitted, uses $_.

                print hex '0xAf'; # prints '175'
                print hex 'aF';   # same

            Hex strings may only represent integers. Strings that would cause
            integer overflow trigger a warning. Leading whitespace is not
            stripped, unlike oct(). To present something as hex, look into
            "printf", "sprintf", and "unpack".


    oct EXPR
    oct     Interprets EXPR as an octal string and returns the corresponding
            value. (If EXPR happens to start off with "0x", interprets it as a
            hex string. If EXPR starts off with "0b", it is interpreted as a
            binary string. Leading whitespace is ignored in all three cases.)
            The following will handle decimal, binary, octal, and hex in
            standard Perl notation:

                $val = oct($val) if $val =~ /^0/;

            If EXPR is omitted, uses $_. To go the other way (produce a number
            in octal), use sprintf() or printf():

                $dec_perms = (stat("filename"))[2] & 07777;
                $oct_perm_str = sprintf "%o", $perms;

            The oct() function is commonly used when a string such as 644
            needs to be converted into a file mode, for example. Although Perl
            automatically converts strings into numbers as needed, this
            automatic conversion assumes base 10.

            Leading white space is ignored without warning, as too are any
            trailing non-digits, such as a decimal point ("oct" only handles
            non-negative integers, not negative integers or floating point).

PORTING CAVEATS
===============

With the arrival of RakuAST, it has become impossible to access the topic variable (`$_`) of the caller's scope. So Perl's idiom of calling `chop` or `chomp` without arguments has become impossible. Code such as:

```raku
say hex;
```

should be changed to either:

```raku
say hex($_);
```

or, using the subroutine as a method syntax, with the prefix `.` shortcut to use that scope's `$_` as the invocant:

```raku
say .&hex;
```

AUTHOR
======

Elizabeth Mattijsen <liz@raku.rocks>

If you like this module, or what I’m doing more generally, committing to a [small sponsorship](https://github.com/sponsors/lizmat/) would mean a great deal to me!

Source can be located at: https://github.com/lizmat/P5hex . Comments and Pull Requests are welcome.

COPYRIGHT AND LICENSE
=====================

Copyright 2018, 2019, 2020, 2021, 2023, 2026 Elizabeth Mattijsen

Re-imagined from Perl as part of the CPAN Butterfly Plan.

This library is free software; you can redistribute it and/or modify it under the Artistic License 2.0.

