Re: Pattern matching details questions

On 06.02.2025 at 20:24, Larry Garfield wrote: > On Thu, Feb 6, 2025, at 3:05 AM, Valentin Udaltsov wrote: > >>> Because PHP uses only an LL(1) parser Actually, we're using an LALR(1) parser; LL(1) is more constrained (although, personally, I like those for their simplicity). >> Are there any plans to upgrade the parser to bypass these limitations? >> I remember Nikita shared some thoughts on why this is not trivial in >> https://wiki.php.net/rfc/arrow_functions_v2. Maybe >> something has >> changed since then? > > I'm not aware of any plans to change the parser. That would be a rather dramatic and > invasive change. There have been ideas to use some more powerful features of bison[1], like GLR, so that would not necessarily be a drastic and invasive change. I'm not aware of any concrete plans, and these more powerful features are not without downsides. [1] <https://www.gnu.org/software/bison/manual/html_node/LR-Table-Construction..html#LR-Table-Construction.> Christoph