On Thu, Feb 2, 2012 at 4:15 PM, Mark S. Miller <[email protected]> wrote:
> > > On Thu, Feb 2, 2012 at 2:00 PM, Waldemar Horwat <[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 $$, >> $id.id, $id[expr], etc.? >> > > > I'll let Mike speak for the details of what he really wants to propose. > But here are the answers from E: > > escapes with the quasi literal text are taken care of by the QuasiChar > production, much like the existing definition of > escapes *within* ... > DoubleStringCharacter: > > QuasiChar :: > SourceCharacter but not one of $ or ` > $ $ > $ ` > $ \ EscapeSequence > > So that `$$` === "$", `$`` === "`", 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. > > -- > Cheers, > --MarkM > -- Cheers, --MarkM
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