On Mon, Sep 15, 2008 at 12:16:22PM +0200, Moritz Lenz wrote: : Chris Davaz wrote: : > I'm not sure if it's anywhere in the specs, but I was expecting to be able : > to do this: : > : > .say for =$in unless $foo; : : to quote http://perlcabal.org/syn/S04.html#Loop_statements : : :Looping statement modifiers are the same as in Perl 5 except that, for : :ease of writing list comprehensions, a looping statement modifier is : :allowed to contain a single conditional statement modifier: : : : : @evens = ($_ * 2 if .odd for 0..100); : : : > Where we have multiple modifiers, here "for" and "unless". Is this in the : > specs? If yes, is it supposed to work in pugs or rakudo? If it's not in the : > specs can we add it? ;-) : : The "authoritative" source to ask if a piece of text is valid Perl 6 is : STD.pm. It parses your example, but not as you might expect. Output from : STD5_dump_match : : :Unknown routines: : : unless called at 1 : :comp_unit: : : statementlist: : : statement: : : EXPR: : : noun: : : dotty: : : . : : dottyop: : : methodop: : : longname: : : name: : : identifier: : : say : : : : statement_mod_loop: : : for : : modifier_expr: : : EXPR: : : pre: : : prefix: : : = : : noun: : : variable: : : sigil: : : sigil: : : $ : : desigilname: : : longname: : : name: : : identifier: : : in : : : : statement: : : EXPR: : : noun: : : term: : : unless : : args: : : : : arglist: : : EXPR: : : noun: : : variable: : : sigil: : : sigil: : : $ : : desigilname: : : longname: : : name: : : identifier: : : foo : : ;\n : : So 'unless' is actually parsed as a sub call.
That's obviously a bogus parse, and I even know how it happened (because "unless" is currently considered a terminator that doesn't distinguish between expression termination and statement termination), but I'm not sure how to fix it yet. It's possible that statement modifiers should be demoted to very-low-precedence operators, but there are some problems with that that I don't have enough brain to think through at the moment. Larry
