Are spaces allowed between " :" and "param" in the field attribute?

[yuki-kimoto]

I'm seeing the field grammer. I find an ambiguous expression.

https://github.com/Ovid/Cor/blob/master/rfc/grammar.md#33-field-grammar

ATTRIBUTE        ::= ':' (
                              'param'     NAME?   # allowed in constructor
                            | 'name'      NAME?   # alternate name (defaults to field name minus the sigil)
                            | 'reader'    NAME?   # $field method to read the field
                            | 'writer'    NAME?   # set_$field method to write the field
                            | 'predicate' NAME?   # is_$field method to test if field is defined
                            | 'common'            # identifies field as class method
                            | HANDLES
                     )

...

PAIR             ::= IDENTIFIER  ':' IDENTIFIER

Are spaces allowed between " :" and "param", etc in the field attribute?

:    param

[Ovid]

Yes. These are normal attributes, with the argument to the attribute receiving special handling by @leonerd's code.

[yuki-kimoto]

The link's attributes allow the following code : MyAttribute Test .

https://metacpan.org/pod/attributes

sub foo : MyAttribute Test;

On the other hand, In Corrina, it looks like :param and :reader

field $x :param :reader;

Dose Corrina allow the following code?

field $x : param reader;

[Ovid]

@leonerd Might be better prepared to answer that one. I actually forgot about that syntax. To be honest, I would prefer an enforcement of the leading colon, no space, for all attributes, but that's not my call to make (and that might just be an aesthetic preference).

[yuki-kimoto]

Thanks. I wait for the preparation.

[rwp0]

That's a good catch. Syntax-wise that's really interesting to know.

[tobyink]

Perl is generally pretty liberal about allowing extra whitespace.

perl -E'my $   x = 42; say $ x'