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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
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")) & 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:
or, using the subroutine as a method syntax, with the prefix
. shortcut to use that scope's
$_ as the invocant:
Elizabeth Mattijsen [email protected]
Source can be located at: https://github.com/lizmat/P5hex . Comments and Pull Requests are welcome.
Copyright 2018-2020 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.