@uml 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. @final
See Implementation
@uml 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. @final