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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>It almost works. I don’t know how to insert the binding inside
de let<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>---<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>(define attr '(a1 a2 a3))<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>(define slot-value<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> (λ (slot-name objet)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><span lang=FR style='font-size:11.0pt;font-family:
"Calibri","sans-serif";color:#1F497D'>(cadr (assq slot-name objet))))<o:p></o:p></span></p>
<p class=MsoNormal><span lang=FR style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=FR style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>(define-syntax (tata stx)<o:p></o:p></span></p>
<p class=MsoNormal><span lang=FR style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>(syntax-case stx ()<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> [(_ a v (s ps ...) body ...)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> #'(λ (self ps ...) <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> `(let ,(map (λ (p-attr) <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> (list p-attr <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> (slot-value p-attr self)))<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> a) <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> body ...))<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> ]))<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> ((tata attr vals (self p1 p2) (display self) (newline) (+ p2
a1)) <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> '((a1 10)(a2 20)(a3 30)) 4 5)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:Wingdings;
color:#1F497D'>è</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>(let ((a1 10) (a2 20) (a3 30)) (display self) (newline) (+ p2
a1))<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>===<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>If I remove the quote in front of the let, I got the following
error<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>let: bad syntax (not an identifier and expression for a binding)
in: map<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span lang=FR style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>De :</span></b><span
lang=FR style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> YC
[mailto:yinso.chen@gmail.com] <br>
<b>Envoyé :</b> December-11-08 7:29 PM<br>
<b>À :</b> andre.mayers@usherbrooke.ca<br>
<b>Cc :</b> pltscheme<br>
<b>Objet :</b> Re: [plt-scheme] how to quote identifier in macro<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal>On Thu, Dec 11, 2008 at 3:32 PM, Andre Mayers <<a
href="mailto:andre.mayers@usherbrooke.ca" target="_blank">andre.mayers@usherbrooke.ca</a>>
wrote:<o:p></o:p></p>
<div>
<div>
<p><span lang=FR style='font-size:11.0pt;color:#1F497D'>Eureka. It works. </span><o:p></o:p></p>
<p><span style='font-size:11.0pt;color:#1F497D'>Now how to get rid of eval ?</span><o:p></o:p></p>
</div>
</div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'>As Noel said, try to write what
you want as the final result, instead of using list & list* to create the
expression and then eval it.<br>
<br>
As an example, the following creates a lambda without list, list*, and eval.<br>
<br>
(define-syntax (tada2 stx)<br>
(syntax-case stx ()<br>
((_ a1 a2 ...)<br>
#'(lambda (a1 a2 ...)<br>
(list a1 a2 ... 'a1 'a2
...)))))<br>
<br>
((tada2 a b c) 1 2 3) ;; => ??<br>
<br>
HTH,<br>
yc<o:p></o:p></p>
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