RE: QuasiQuoting for declarations
Simon Peyton-Jones <[email protected]> Mon, 1 Dec 2008 15:09:18 +0000
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I think there is no difficulty in principle.
In the HsExpr you'll see the constructors
HsSpliceE
HsQuasiQuoteE
The former is run by the type checker; thelatter by the renamer.
To fulfil your hope, we'd need to add a new constructor to HsDecls.SpliceDe=
cl. At the moment it just has
SpliceDecl
and we'd add
QuasiQuoteDecl
After that I think the rest would follow. If someone feels like taking it u=
p, I'd be glad to help. For a start, make a Trac feature request and dump =
this thread into it.
Meanwhile, I gather you are using quasi-quotes. I'm interested to know abo=
ut applications: what are you using it for?
Simon
From: [email protected] [mailto:template-haskell-bounces=
@haskell.org] On Behalf Of Andrea Vezzosi
Sent: 01 December 2008 08:15
To: [email protected]
Subject: [Template-haskell] QuasiQuoting for declarations
Currently quasiquoting is limited to patterns and expressions, are there an=
y problems in extending it to declarations? we already have [d| ... |] and =
toplevel splices afterall.
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<p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
"sans-serif";
color:#1F497D'>I think there is no difficulty in principle.<o:p></o:p></spa=
n></p>
<p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
"sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
"sans-serif";
color:#1F497D'>In the HsExpr you’ll see the constructors<o:p></o:p></=
span></p>
<p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
"sans-serif";
color:#1F497D'> =
HsSpliceE<o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
"sans-serif";
color:#1F497D'> =
HsQuasiQuoteE<o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
"sans-serif";
color:#1F497D'>The former is run by the type checker; thelatter by the rena=
mer.<o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
"sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
"sans-serif";
color:#1F497D'>To fulfil your hope, we’d need to add a new constructo=
r to HsDecls.SpliceDecl.
At the moment it just has<o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
"sans-serif";
color:#1F497D'> =
SpliceDecl<o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
"sans-serif";
color:#1F497D'>and we’d add<o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
"sans-serif";
color:#1F497D'> =
QuasiQuoteDecl<o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
"sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
"sans-serif";
color:#1F497D'>After that I think the rest would follow. If someone feels l=
ike
taking it up, I’d be glad to help. For a start, make a Trac fea=
ture request
and dump this thread into it.<o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
"sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
"sans-serif";
color:#1F497D'>Meanwhile, I gather you are using quasi-quotes. I̵=
7;m interested
to know about applications: what are you using it for?<o:p></o:p></span></p=
>
<p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
"sans-serif";
color:#1F497D'><br>
Simon<o:p></o:p></span></p>
<p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
"sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=3DMsoNormal><b><span lang=3DEN-US style=3D'font-size:10.0pt;font-f=
amily:
"Tahoma","sans-serif"'>From:</span></b><span lang=3DEN-US style=3D'font-siz=
e:10.0pt;
font-family:"Tahoma","sans-serif"'> [email protected]
[mailto:[email protected]] <b>On Behalf Of </b>Andrea
Vezzosi<br>
<b>Sent:</b> 01 December 2008 08:15<br>
<b>To:</b> [email protected]<br>
<b>Subject:</b> [Template-haskell] QuasiQuoting for declarations<o:p></o:p>=
</span></p>
</div>
</div>
<p class=3DMsoNormal><o:p> </o:p></p>
<p class=3DMsoNormal>Currently quasiquoting is limited to patterns and
expressions, are there any problems in extending it to declarations? we alr=
eady
have [d| ... |] and toplevel splices afterall.<o:p></o:p></p>
</div>
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