Replace pyparsing with lark for better error messages#124

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pkienzle wants to merge 17 commits into

Commits on Mar 5, 2026

Explore lark as replacement for the pyparsing formula parser
Paul Kienzle
committed

Commits on Mar 6, 2026

improve error display for lark parser
Paul Kienzle
committed
better formatting of invalid valence error
Paul Kienzle
committed
Allow Ang when defining layered samples
Paul Kienzle
committed
check failure text in pyparsing
Paul Kienzle
committed
display and parse unicode superscripts for isotopes
Paul Kienzle
committed
fix tests
Paul Kienzle
committed

Commits on May 21, 2026

add output type hints to ast transforms
Paul Kienzle
committed
adjust imports; improve :SEQ error message
Paul Kienzle
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move unicode superscript/subscript conversion to util; clean up type hints
Paul Kienzle
committed
fix tests and doc build
Paul Kienzle
committed
remove pyparsing dependency
Paul Kienzle
committed

Commits on May 22, 2026

tweak formula docs
Paul Kienzle
committed
improve output of error handling demo python -m periodictable.lark_parse
Paul Kienzle
committed
attempt to fix missing lark on CI
Paul Kienzle
committed
attempt to fix missing lark on CI
Paul Kienzle
committed
attempt to fix missing lark on CI
Paul Kienzle
committed