[parenscript-devel] Symbol-macro clashes
Hi list, Just a quick note. Something I discovered a while ago, which hasn't quite been affected by recent patches. There's a potential clash between symbol macros and normal symbols in parenscript. Sometimes, we don't want to macroexpand certain symbols: In Common Lisp, PS> (define-symbol-macro %cldata (list 1 2 3)) %CLDATA PS> (let ((%cldata (list 4 5 6))) %cldata) (4 5 6) In parenscript, PS> (define-ps-symbol-macro %data (list 1 2 3)) %DATA PS> (ps %data) "[1, 2, 3];" PS> (ps (let ((%data (list 2 4 5))) %data)) ; Evaluation aborted. The value (ARRAY 1 2 3) is not of type SYMBOL. [Condition of type TYPE-ERROR] The %data (binding) shouldn't be expanded, and the %data in the let body should now be "shadowed" by the new binding. This also occurs with LET*, FLET, and LABELS (what else have I missed?). I couldn't looked too closely, but recently, all the variable binding seem to have been refactored into the code for ps-special-form var, so perhaps this is now easier to fix. Cheers, Yong.
Thanks for the bug report. Just pushed a fix. Vladimir 2010/2/3 szergling <senatorzergling@gmail.com>:
Hi list,
Just a quick note.
Something I discovered a while ago, which hasn't quite been affected by recent patches. There's a potential clash between symbol macros and normal symbols in parenscript. Sometimes, we don't want to macroexpand certain symbols:
In Common Lisp,
PS> (define-symbol-macro %cldata (list 1 2 3)) %CLDATA PS> (let ((%cldata (list 4 5 6))) %cldata) (4 5 6)
In parenscript,
PS> (define-ps-symbol-macro %data (list 1 2 3)) %DATA PS> (ps %data) "[1, 2, 3];" PS> (ps (let ((%data (list 2 4 5))) %data)) ; Evaluation aborted.
The value (ARRAY 1 2 3) is not of type SYMBOL. [Condition of type TYPE-ERROR]
The %data (binding) shouldn't be expanded, and the %data in the let body should now be "shadowed" by the new binding. This also occurs with LET*, FLET, and LABELS (what else have I missed?).
I couldn't looked too closely, but recently, all the variable binding seem to have been refactored into the code for ps-special-form var, so perhaps this is now easier to fix.
Cheers,
Yong.
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szergling -
Vladimir Sedach