Writing grammars presents an interesting set of challenges, especially dealing with ambiguity and precedence as you mention. I find that the `tree-sitter playg

Writing grammars presents an interesting set of challenges, especially dealing with ambiguity and precedence as you mention. I find that the `tree-sitter playground` command is convenient for interactively trying out different possibilities. There's also a debug flag "-D" for `tree-sitter parse` which gives detailed information about the shift/reduce points in the parser state and different branches it parsed simultaneously (because it's a GLR parser).