PosColumn : assert replaced by Exception. PosRowException replaced by generic Exception.

README.md

@@ -83,3 +83,4 @@ printer.printRow([
 * Flutter example: print a demo receipt
 * Flutter example: discover active Wi-Fi printers
 * USB, Bluetooth printers support
+* Add encoding commands
\ No newline at end of file

lib/esc_pos_printer.dart

@@ -7,6 +7,5 @@
 library esc_pos_printer;
 
 export './src/enums.dart';
-export './src/exceptions.dart';
 export './src/pos_styles.dart';
 export './src/printer.dart';

lib/src/exceptions.dart

-/*
- * esc_pos_printer
- * Created by Andrey Ushakov
- * 
- * Copyright (c) 2019. All rights reserved.
- * See LICENSE for distribution and usage details.
- */
-
-/// Used by [Printer.printRow] method
-class PosRowException implements Exception {
-  PosRowException(this._msg);
-  String _msg;
-
-  @override
-  String toString() => 'PosRowException: $_msg';
-}

lib/src/pos_column.dart

@@ -14,7 +14,11 @@ class PosColumn {
     this.text = '',
     this.width = 2,
     this.styles = const PosStyles(),
-  }) : assert(width >= 1 && width <= 12);
+  }) {
+    if (width < 1 || width > 12) {
+      throw Exception('Column width must be between 1..12');
+    }
+  }
 
   String text;
   int width;

lib/src/printer.dart

@@ -11,7 +11,6 @@ import 'dart:typed_data';
 import 'package:hex/hex.dart';
 import 'commands.dart';
 import 'enums.dart';
-import 'exceptions.dart';
 import 'pos_column.dart';
 import 'pos_styles.dart';
 
@@ -99,7 +98,7 @@ class Printer {
   void printRow(List<PosColumn> cols) {
     final validSum = cols.fold(0, (int sum, col) => sum + col.width) == 12;
     if (!validSum) {
-      throw PosRowException('Total columns width must be equal to 12');
+      throw Exception('Total columns width must be equal to 12');
     }
 
     for (int i = 0; i < cols.length; ++i) {