Printing barcodes.

lib/src/commands.dart

@@ -50,8 +50,8 @@ const cRasterImg = '${gs}v0'; // Print raster bit image [obsolete command]
 const cBitImg = '$esc*'; // Set bit image mode
 
 // Barcode
-const cBarcodeSelectPos = '${gs}H'; // Select print position of HRI characters
-const cBarcodeSelectFont = '${gs}f'; // Select font for HRI characters
-const cBarcodeSetH = '${gs}h'; // Set barcode height
-const cBarcodeSetW = '${gs}w'; // Set barcode width
+const cBarcodeSelectPos = '${gs}H'; // Select print position of HRI characters [N]
+const cBarcodeSelectFont = '${gs}f'; // Select font for HRI characters [N]
+const cBarcodeSetH = '${gs}h'; // Set barcode height [N]
+const cBarcodeSetW = '${gs}w'; // Set barcode width [N]
 const cBarcodePrint = '${gs}k'; // Print barcode

lib/src/enums.dart

@@ -92,3 +92,223 @@ class PosCodeTable {
   /// Space page
   static const spacePage = PosCodeTable._internal(255);
 }
+
+class BarcodeType {
+  const BarcodeType._internal(this.value);
+  final int value;
+
+  /// UPC-A
+  static const upcA = BarcodeType._internal(0);
+
+  /// UPC-E
+  static const upcE = BarcodeType._internal(1);
+
+  /// JAN13 (EAN13)
+  static const ean13 = BarcodeType._internal(2);
+
+  /// JAN8 (EAN8)
+  static const ean8 = BarcodeType._internal(3);
+
+  /// CODE39
+  static const code39 = BarcodeType._internal(4);
+
+  /// ITF (Interleaved 2 of 5)
+  static const itf = BarcodeType._internal(5);
+
+  /// CODABAR (NW-7)
+  static const codabar = BarcodeType._internal(6);
+}
+
+class Barcode {
+  /// UPC-A
+  ///
+  /// k = 11, 12
+  /// d = '0' – '9'
+  Barcode.upcA(List<int> data) {
+    _type = BarcodeType.upcA;
+    _data = data;
+
+    final k = data.length;
+    if (k != 11 || k != 12) {
+      throw Exception('Barcode: Wrong data range');
+    }
+
+    final numeric = RegExp(r'^[0-9]$');
+    final bool isDataValid = data.every((d) => numeric.hasMatch(d.toString()));
+    if (!isDataValid) {
+      throw Exception('Barcode: Data is not valid');
+    }
+  }
+
+  /// UPC-E
+  ///
+  /// k = 6 – 8, 11, 12
+  /// d = '0' – '9' (However, d0 = '0' when k = 7, 8, 11, 12)
+  Barcode.upcE(List<int> data) {
+    _type = BarcodeType.upcE;
+    _data = data;
+
+    final k = data.length;
+    if (![6, 7, 8, 11, 12].contains(k)) {
+      throw Exception('Barcode: Wrong data range');
+    }
+
+    if ([7, 8, 11, 12].contains(k) && data[0].toString() != '0') {
+      throw Exception('Barcode: Data is not valid');
+    }
+
+    final numeric = RegExp(r'^[0-9]$');
+    final bool isDataValid = data.every((d) => numeric.hasMatch(d.toString()));
+    if (!isDataValid) {
+      throw Exception('Barcode: Data is not valid');
+    }
+  }
+
+  /// JAN13 (EAN13)
+  ///
+  /// k = 12, 13
+  /// d = '0' – '9'
+  Barcode.ean13(List<int> data) {
+    _type = BarcodeType.ean13;
+    _data = data;
+
+    final k = data.length;
+    if (k != 12 || k != 13) {
+      throw Exception('Barcode: Wrong data range');
+    }
+
+    final numeric = RegExp(r'^[0-9]$');
+    final bool isDataValid = data.every((d) => numeric.hasMatch(d.toString()));
+    if (!isDataValid) {
+      throw Exception('Barcode: Data is not valid');
+    }
+  }
+
+  /// JAN8 (EAN8)
+  ///
+  /// k = 7, 8
+  /// d = '0' – '9'
+  Barcode.ean8(List<int> data) {
+    _type = BarcodeType.ean8;
+    _data = data;
+
+    final k = data.length;
+    if (k != 7 || k != 8) {
+      throw Exception('Barcode: Wrong data range');
+    }
+
+    final numeric = RegExp(r'^[0-9]$');
+    final bool isDataValid = data.every((d) => numeric.hasMatch(d.toString()));
+    if (!isDataValid) {
+      throw Exception('Barcode: Data is not valid');
+    }
+  }
+
+  /// CODE39
+  ///
+  /// k >= 1
+  /// d: '0'–'9', A–Z, SP, $, %, *, +, -, ., /
+  Barcode.code39(List<int> data) {
+    _type = BarcodeType.code39;
+    _data = data;
+
+    final k = data.length;
+    if (k < 1) {
+      throw Exception('Barcode: Wrong data range');
+    }
+
+    final regex = RegExp(r'^[0-9A-Z \$\%\*\+\-\.\/]$');
+    final bool isDataValid = data.every((d) => regex.hasMatch(d.toString()));
+    if (!isDataValid) {
+      throw Exception('Barcode: Data is not valid');
+    }
+  }
+
+  /// ITF (Interleaved 2 of 5)
+  ///
+  /// k >= 2 (even number)
+  /// d = '0'–'9'
+  Barcode.itf(List<int> data) {
+    _type = BarcodeType.itf;
+    _data = data;
+
+    final k = data.length;
+    if (k < 2 || !k.isEven) {
+      throw Exception('Barcode: Wrong data range');
+    }
+
+    final numeric = RegExp(r'^[0-9]$');
+    final bool isDataValid = data.every((d) => numeric.hasMatch(d.toString()));
+    if (!isDataValid) {
+      throw Exception('Barcode: Data is not valid');
+    }
+  }
+
+  /// CODABAR (NW-7)
+  ///
+  /// k >= 2
+  /// d: '0'–'9', A–D, a–d, $, +, −, ., /, :
+  /// However, d0 = A–D, dk = A–D (65-68)
+  /// d1 = a-d, dk = a-d (97-100)
+  Barcode.codabar(List<int> data) {
+    _type = BarcodeType.codabar;
+    _data = data;
+
+    final k = data.length;
+    if (k < 2) {
+      throw Exception('Barcode: Wrong data range');
+    }
+
+    final regex = RegExp(r'^[0-9A-Da-d\$\+\-\.\/\:]$');
+    final bool isDataValid = data.every((d) => regex.hasMatch(d.toString()));
+    if (!isDataValid) {
+      throw Exception('Barcode: Data is not valid');
+    }
+
+    if (!((data[0] >= 65 && data[0] <= 68) &&
+        (data[k - 1] >= 65 && data[k - 1] <= 68))) {
+      throw Exception('Barcode: Wrong data range');
+    }
+
+    if (!((data[0] >= 97 && data[0] <= 100) &&
+        (data[k - 1] >= 97 && data[k - 1] <= 100))) {
+      throw Exception('Barcode: Wrong data range');
+    }
+  }
+
+  BarcodeType _type;
+  List<int> _data;
+
+  BarcodeType get type => _type;
+  List<int> get data => _data.map<int>((d) => d.toString().codeUnitAt(0));
+}
+
+class BarcodeText {
+  const BarcodeText._internal(this.value);
+  final int value;
+
+  /// Not printed
+  static const none = BarcodeText._internal(0);
+
+  /// Above the barcode
+  static const above = BarcodeText._internal(1);
+
+  /// Below the barcode
+  static const below = BarcodeText._internal(2);
+
+  /// Both above and below the barcode
+  static const both = BarcodeText._internal(3);
+}
+
+class BarcodeFont {
+  const BarcodeFont._internal(this.value);
+  final int value;
+
+  static const fontA = BarcodeText._internal(0);
+  static const fontB = BarcodeText._internal(1);
+  static const fontC = BarcodeText._internal(2);
+  static const fontD = BarcodeText._internal(3);
+  static const fontE = BarcodeText._internal(4);
+  static const specialA = BarcodeText._internal(97);
+  static const specialB = BarcodeText._internal(98);
+}

lib/src/printer.dart

@@ -448,4 +448,38 @@ class Printer {
 
     sendRaw(List.from(header)..addAll(res));
   }
+
+  /// Print barcode
+  ///
+  /// [width] range and units are different depending on the printer model.
+  /// [height] range: 1 - 255. The units depend on the printer model.
+  /// Width, height, font, text position settings are effective until performing of ESC @, reset or power-off.
+  void printBarcode(
+    Barcode barcode, {
+    int width,
+    int height,
+    BarcodeFont font,
+    BarcodeText textPos = BarcodeText.below,
+  }) {
+    // Set text position
+    sendRaw(cBarcodeSelectPos.codeUnits + [textPos.value]);
+
+    // Set font
+    if (font != null) {
+      sendRaw(cBarcodeSelectFont.codeUnits + [font.value]);
+    }
+
+    // Set width
+    if (width >= 0) {
+      sendRaw(cBarcodeSetW.codeUnits + [width]);
+    }
+    // Set height
+    if (height >= 1 && height <= 255) {
+      sendRaw(cBarcodeSetH.codeUnits + [height]);
+    }
+
+    // Print barcode
+    final header = cBarcodePrint.codeUnits + [barcode.type.value];
+    sendRaw(header + barcode.data + [0]);
+  }
 }