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


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

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

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


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


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).


In future language versions of Raku, it will become impossible to access the $_ variable of the caller's scope, because it will not have been marked as a dynamic variable. So please consider changing:


to either:


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



Elizabeth Mattijsen liz@raku.rocks

If you like this module, or what I’m doing more generally, committing to a small sponsorship would mean a great deal to me!

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


Copyright 2018, 2019, 2020, 2021, 2023 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.