IMatchable (MatchNode matchNode, int index) { int node_type = matchNode.getType(); if (node_type == MatchNode.MATCHNODE_STATEMENT && !this.stats.isEmpty()) { String position = (String)matchNode.getRuleValue(MatchProperties.STATEMENT_POSITION); if (position != null) { if (position.matches("-?\\d+")) { return this.stats.get((this.stats.size() + Integer.parseInt(position)) % this.stats.size()); // care for negative positions } } else if (index < this.stats.size()) { // use 'index' parameter return this.stats.get(index); } } else if (node_type == MatchNode.MATCHNODE_EXPRENT && this.exprents != null && !this.exprents.isEmpty()) { String position = (String)matchNode.getRuleValue(MatchProperties.EXPRENT_POSITION); if (position != null) { if (position.matches("-?\\d+")) { return this.exprents.get((this.exprents.size() + Integer.parseInt(position)) % this.exprents.size()); // care for negative positions } } else if (index < this.exprents.size()) { // use 'index' parameter return this.exprents.get(index); } } return null; }