public final int getPrecedence() {
		if (_precedenceStack.isEmpty()) {
			return -1;
		}

		return _precedenceStack.peek();
	}
Get the precedence level for the top-most precedence rule.

@return The precedence level for the top-most precedence rule, or -1 if
the parser context is not nested within a precedence rule.
runtime/Java/src/org/antlr/v4/runtime/Parser.java