The error I see when evaluating your third example is happening because your LOOP..DO is being used as an expression (it's a branch of an IF form which is an argument to the POST function). This is illegal because LOOP..DO compiles to a statement in JS, not an expression. Here's a shorter version of the error:
(ps (foo (loop for i from 0 to len do (bar)))) => compiler error
Note that using LOOP..COLLECT instead of LOOP..DO does work, but only because PS goes to the trouble of wrapping it an a lambda that then gets called to return the collection:
(ps (foo (loop for i from 0 to len collect (bar)))) =>
"foo((function () { var collect52 = []; for (var i = 0; i <= len; i += 1) { collect52.push(bar()); }; return collect52; })());"
PS treats these two cases differently because LOOP..COLLECT (and its relatives like LOOP..SUM) are clearly "expressiony" while LOOP..DO isn't; wrapping the latter in a lambda isn't justifiable in the general case.
Does this help?
Daniel
On Wed, Mar 23, 2011 at 10:13 AM, F D dubfa@hotmail.com wrote:
Hello,
I'm trying to convert my js strings into parenscript code but I've a problem.
- This works
(ps::ps (ps::chain $ (post jsonServerUrl (if (ps::@ data error) (alert (ps::@ data error)) (progn (alert "test1") (alert "test2") ))))) 2) This works (ps::ps (if (ps::@ data error) (alert (ps::@ data error)) (loop for i from 0 to arLen do (ps::chain newil (setAttribute "class" (if (= (ps::@ (ps:getprop data i) typedonnee) "tabgrouptype") "ui-state-default" "ui-state-default no-nest"))
))))
- but this doesn't work (the if clause of first example if replaced by the
if clause of the second one) (ps::ps (ps::chain $ (post jsonServerUrl (if (ps::@ data error) (alert (ps::@ data error)) (loop for i from 0 to arLen do (ps::chain newil (setAttribute "class" (if (= (ps::@(ps:getprop data i) typedonnee) "tabgrouptype") "ui-state-default" "ui-state-default no-nest")) ))))))
Is there something wrong with my code?
Thanks
FD
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