On 02/02/2012 04:15 PM, Mark S. Miller wrote:
On Thu, Feb 2, 2012 at 2:00 PM, Waldemar Horwat <[email protected]
<mailto:[email protected]>> wrote:
OK. This introduces yet another lexing context, in which all productions
*except* QuasiMiddle and QuasiEnd are disallowed, and white space and comment
handling is funny. That works if the expressions must be one of the two forms:
$id
${expr}
Is that the exhaustive list, or are we looking at other forms such as $$, $id.id
<http://id.id>, $id[expr], etc.?
I'll let Mike speak for the details of what he really wants to propose. But
here are the answers from E:
escapes with the quasi literal text are taken care of by the QuasiChar
production, much like the existing definition of DoubleStringCharacter:
QuasiChar ::
SourceCharacter but not one of $ or `
$ $
$ `
$ \ EscapeSequence
So that `$$` === "$", `$`` === "`", and `$\n` === "\n", respectively.
Regarding `...$id.id...` and `...$id[expr]...`, only the first id in each case
in in the quasiHole. All the text afterwards is part of the QuasiClose.
Good. I'll have to think about this a bit more, but there's a chance you
converted me.
Waldemar
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