Nested Quasis

Mike Samuel mikesamuel at
Tue Jan 31 16:06:38 PST 2012

2012/1/31 Allen Wirfs-Brock <allen at>:
> On Jan 31, 2012, at 2:36 PM, Waldemar Horwat wrote:
>> On 01/28/2012 02:54 PM, Erik Arvidsson wrote:
>>> Under the open issues for Quasi Literals,
>>> , the
>>> topic of nesting is brought up.
>>> After implementing Quasi Literals in Traceur it is clear that
>>> supporting nested quasi literals is easier than not supporting them.
>>> What is the argument for not supporting nesting? Can we resolve this?
>> This has been hashed out in committee before.  Do you have a solution to the grammar problems, such as having a full ECMAScript parser inside the lexer?  You can't just count parentheses because that breaks regexps.
> I would think the solution to this is pretty straightforward.  Basically, a Quasi is not a single token.   the grammar in the proposal can almost be read that way right now.   It should only take a little cleanup to factor it into a pure lexical part and a syntactic part. A few [no whitespace here] tokens will probably be needed

I addressed this at

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