Announcements

• This is likely to be the last major release that supports Python 2 !

We are now working on a Python3.6+ only v1.0 branch, which will soon become the default. See the work in progress: #925

• We also have a new online IDE! Check it out here: https://lark-parser.github.io/ide

• Lark can now generate standalone Javascript parsers! Check it out here: https://github.com/lark-parser/Lark.js (still in beta)

Changes

• Using rule repeat (~ syntax) is now much much faster for large numbers, thanks to @MegaIng

• Bugfix for the propagate_positions option. Added option value propagate_positions='ignore_ws'.

• Fixed reconstructor for when keep_all_tokens=True

• Added merge_transformers (Thanks Robin!)

• Many minor bugfixes, and improvements to code and docs