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Postings from December 2004
A few initial questions/comments on some small things -- I'll get
to the bigger constructs a bit later. I'm an "outside-in" designer,
so I tend to work on the macro and micro levels until I meet in the
middle.
> rule identifier() { <<alpha>> \w* }
Does Perl 6 allow leading underscores in identifiers? If so,
shouldn't this be
rule identifier() { <+<alpha>+[_]> \w* }
?
> rule open_expression_grouping() { \( }
> rule close_expression_grouping() { \) }
> rule open_argument_list() { \( }
> rule close_argument_list() { \) }
I'm not sure I agree with expression_grouping being defined in this way--
it seems to me that parens (and brackets and braces and dots) are being
treated as operators (S03, S04), perhaps even "postcircumfix" operators
if I understand what that means (A12). So we need to be a bit careful
here.
In addition to reviewing what's been done so far, I'll take a stab
at writing the rules for P6 rules. :-)
Pm
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