Parse javascript?

[bgnx]

Issue type

• Question

Description

Can pegjs grammar represent current javascript grammar? Is there any up to date (or just existing) pegjs grammar for javascript?

[futagoza]

You mean a PEG.js generated parser that can parse ES2018+ JavaScript? Although it is possible to make one in the PEG.js grammar (I made a working ES2015 parser 2 years ago, lost now with my broken laptop 😢), currently there is none that I'm aware of, no. But once Stage 1 of #523 is done, it's one of the things I want to get around to doing.

[lauriro]

how about example?

[bd82]

how about example?

I think that is not a modern (ES2017) ECMAScript grammar.
But could be used as a basis to build upon.

I did try to use this example ES5 grammar in the past but it seems to have kind of choked on anything but very small inputs. So I recommend including a small performance test if/when such a grammar is implemented.