Module version descriptor
Version objects identify version of software components (and potentially other entities). Perl 6 uses them internally for versioning modules.
A version consists of several parts, which are visually represented by joining them with a dot. A version part is usually an integer, a string like
alpha, or a Whatever-star
*. The latter is used to indicate that any version part is acceptable in another version that is compared to the current one.
say v1.0.1 ~~ v1.*; # OUTPUT: «True␤»say v1.0.1 ~~ v1.*.1; # OUTPUT: «True␤»
The first part of version literals contains
v and a number; this might be followed by alphanumeric and Whatever parts and trailed by
+. Multiple parts are separate with a dot
.. A trailing
+ indicates that higher versions are OK in comparisons:
say v1.2 ~~ v1.0; # OUTPUT: «False␤»say v1.2 ~~ v1.0+; # OUTPUT: «True␤»say v0.and.anything.else ~~ v0+; # OUTPUT: «True␤»
In comparisons, order matters, and every part is compared in turn.
say v1.2 cmp v2.1; # OUTPUT: «Less␤»
+ suffix is always taken into account in comparisons:
say v1.0.1+ <=> v1.0.1; # OUTPUT: «More␤»
Whatever) is too, and considered always
Less than whatever digit is in the corresponding part, even if
* is trailed by
say v1.* <=> v1.0; # OUTPUT: «Less␤»say v1.* <= v1.0; # OUTPUT: «True␤»say v1.*+ <= v1.0; # OUTPUT: «True␤»
Please note that method calls, including pseudo methods like
WHAT, require version literals either to be enclosed with parentheses or use some other method to separate them from the dot that denotes a method call, like in these examples:
say (v0.and.some.*.stuff).parts; # OUTPUT: «(0 and some * stuff)␤»say v0.and.some.*.stuff .parts; # OUTPUT: «(0 and some * stuff)␤»
method new(Str )
Version from a string
$s. The string is combed for the numeric, alphabetic, and wildcard components of the version object. Any characters other than alphanumerics and asterisks are assumed to be equivalent to a dot. A dot is also assumed between any adjacent numeric and alphabetic characters.
method parts(Version: --> List)
Returns the list of parts that make up this
my = v1.0.1;my = v1.0.1+;say .parts; # OUTPUT: «(1 0 1)␤»say .parts; # OUTPUT: «(1 0 1)␤»
+ suffix is not considered a part of the
Version object, and thus not returned by this method, as shown above in the
method plus(Version: --> Bool)
True if comparisons against this version allow larger versions too.
my = v1.0.1;my = v1.0.1+;say .plus; # OUTPUT: «False␤»say .plus; # OUTPUT: «True␤»
method Str(Version: --> Str)
Returns a string representation of the invocant.
my = v1.0.1;my = Version.new('1.0.1');say .Str; # OUTPUT: «1.0.1␤»say .Str; # OUTPUT: «1.0.1␤»
method gist(Version: --> Str)
Returns a string representation of the invocant, just like Str, prepended with a lower-case
my = v1.0.1;my = Version.new('1.0.1');say .gist; # OUTPUT: «v1.0.1␤»say .gist; # OUTPUT: «v1.0.1␤»