Let's go...
Parse strings
Refactor
Parse addition of strings
Refactor
Fix (?) grammar
Simplify .dump
Spread the grammar
Simplify Cursor
Parse int * string
Move things around
Parse int multiplication (+big necessary refacto)
Introduce generic utility parsers
Use more generic utility parsers
Refacto
Homogenize error treatment
Be more systematic
Be even more systematic
Implement int addition
Be more systematic