cono · September 8, 2017 18:38
diff --git a/gistfile1.txt b/gistfile1.txt
 grammar SimpleCalc {
    token TOP {
        ^^ <expr> $$
    }

    token expr {
        <number> | <tree-op>
    }

    token tree-op {
        <expr> <op> <expr>
    }

    token number { \d+ }

    token op { '+'|'-' }
 }
	grammar SimpleCalc {
	token TOP {
	^^ <expr> $$
	}

	token expr {
	<number> \| <tree-op>
	}

	token tree-op {
	<expr> <op> <expr>
	}

	token number { \d+ }

	token op { '+'\|'-' }
	}