Nested Quasis

Mark S. Miller erights at google.com
Thu Feb 2 16:16:34 PST 2012


On Thu, Feb 2, 2012 at 4:15 PM, Mark S. Miller <erights at google.com> wrote:

>
>
> On Thu, Feb 2, 2012 at 2:00 PM, Waldemar Horwat <waldemar at google.com>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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