int (@NotNull Side side, int offset) { LineCol twosidePosition = LineCol.fromOffset(getDocument(side), offset); int onesideLine = transferLineToOneside(side, twosidePosition.line); if (onesideLine == -1) return -1; LineCol onesidePosition = new LineCol(onesideLine, twosidePosition.column); return onesidePosition.toOffset(myDocument); }