public TrialUndoParser(TokenStream tokStream, ParseTable prs, ITrialUndoActionProvider ra) throws BadParseSymFileException, NotBacktrackParseTableException { this.tokStream = tokStream; this.prs = prs; this.actionProvider = ra; START_STATE = prs.getStartState(); NUM_RULES = prs.getNumRules(); LA_STATE_OFFSET = prs.getLaStateOffset(); EOFT_SYMBOL = prs.getEoftSymbol(); ERROR_SYMBOL = prs.getErrorSymbol(); ACCEPT_ACTION = prs.getAcceptAction(); ERROR_ACTION = prs.getErrorAction(); if (!prs.isValidForParser()) throw new BadParseSymFileException(); if (!prs.getBacktrack()) throw new NotBacktrackParseTableException(); }