A subset of LaTeX, meant to be intuitive and easy to use. Licensed GNU GPL v3

LaTeXB.lark

%import common (WS, LETTER, NUMBER)
%ignore WS
start: exp?
?exp : term
     | mul
     | div
     | sub
     | add
     | eq
VARIABLE: LETTER [("e"|"E") NUMBER]
?parenthesis: "(" exp ")"
add:  add? term? "+" exp
sub:  sub? term? "-" exp
div:  div? term? "/" exp
mul:  mul? term? "*" exp
pow: pow? term "^" term
eq: exp "=" exp
fra: "\\f" term  "/" term
vmul: (NUMBER raw_term) | (raw_term term)
?raw_term: (parenthesis | fra | pow | VARIABLE)
?term: vmul | parenthesis | fra | pow | VARIABLE | NUMBER | ("-" (parenthesis | fra | VARIABLE | NUMBER))