Is #:auto-nested-attributes documented anywhere? I can't seem to find it in the syntax class documentation
On Tue, Feb 3, 2015 at 3:28 PM, Alexander D. Knauth <alexan...@knauth.org> wrote: > If you switch the order in which the syntax-classes are defined and add > #:auto-nested-attribustes, this works: > #lang racket > (require syntax/parse) > (define-syntax-class B > (pattern (b1 b2 b3))) > (define-syntax-class A > #:auto-nested-attributes > (pattern (a1 a2:B a3))) > (define foo > (syntax-parser > [blah:A #'blah.a2.b1])) > (syntax->datum (foo #'(1 (2 3 4) 5))) ; 2 > > But for some reason this doesn’t work: > #lang at-exp racket > (require syntax/parse) > (define-syntax-class A > #:auto-nested-attributes > (pattern (a1 a2:B a3))) > (define-syntax-class B > (pattern (b1 b2 b3))) > (define foo > (syntax-parser > [blah:A #'blah.a2.b1])) > (syntax->datum (foo #'(1 (2 3 4) 5))) ; 'blah.a2.b1 > > But this does: > #lang at-exp racket > (require syntax/parse) > (define-syntax-class A > #:attributes (a2.b1) > (pattern (a1 a2:B a3))) > (define-syntax-class B > (pattern (b1 b2 b3))) > (define foo > (syntax-parser > [blah:A #'blah.a2.b1])) > (syntax->datum (foo #'(1 (2 3 4) 5))) ; 2 > > On Feb 3, 2015, at 5:30 PM, Jack Firth <jackhfi...@gmail.com> wrote: > > > Suppose I have these syntax classes: > > > > (define-syntax-class A > > (pattern (a1 a2:B a3))) > > > > (define-syntax-class B > > (pattern (b1 b2 b3))) > > > > I'd like to be able to access nested attributes, like so: > > > > (define foo > > (syntax-parser > > [blah:A #'blah.a2.b1])) > > > > Currently, this doesn't work (and it doesn't even throw an error > either). How could I do this? > > ____________________ > > Racket Users list: > > http://lists.racket-lang.org/users > >
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