I have some custom expressions, and i want to add these expressions to the freecad expression engine.
I check the code about the expression, and see some parser files.
Just like:ExpressionParser.l,ExpressionParser.y,ExpressionParser.tab.h and ExpressionParser.tab.c
I think these files are about Bison parser,but i don't know anything about Bison.
So, what should i do?