Add EAN & UPC codes to loyalty cards app

apps/cards/ChangeLog

@@ -2,3 +2,4 @@
 0.02: Hiding widgets while showing the code
 0.03: Added option to use max brightness when showing code
 0.04: Minor code improvements
+0.05: Add EAN & UPC codes

apps/cards/EAN.js

@@ -0,0 +1,73 @@
+/*
+ * JS source adapted from https://github.com/lindell/JsBarcode
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Johan Lindell (johan@lindell.me)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+const encode = require("cards.encode.js");
+const Barcode = require("cards.Barcode.js");
+
+// Standard start end and middle bits
+const SIDE_BIN = '101';
+const MIDDLE_BIN = '01010';
+
+// Base class for EAN8 & EAN13
+class EAN extends Barcode {
+	constructor(data, options) {
+		super(data, options);
+	}
+
+	leftText(from, to) {
+		return this.text.substr(from, to);
+	}
+
+	leftEncode(data, structure) {
+		return encode(data, structure);
+	}
+
+	rightText(from, to) {
+		return this.text.substr(from, to);
+	}
+
+	rightEncode(data, structure) {
+		return encode(data, structure);
+	}
+
+	encode() {
+		const data = [
+			SIDE_BIN,
+			this.leftEncode(),
+			MIDDLE_BIN,
+			this.rightEncode(),
+			SIDE_BIN
+		];
+
+		return {
+			data: data.join(''),
+			text: this.text
+		};
+	}
+
+}
+
+module.exports = EAN;

apps/cards/EAN13.js

@@ -0,0 +1,92 @@
+// Encoding documentation:
+// https://en.wikipedia.org/wiki/International_Article_Number_(EAN)#Binary_encoding_of_data_digits_into_EAN-13_barcode
+/*
+ * JS source adapted from https://github.com/lindell/JsBarcode
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Johan Lindell (johan@lindell.me)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+const EAN = require("cards.EAN.js");
+
+const EAN13_STRUCTURE = [
+	'LLLLLL', 'LLGLGG', 'LLGGLG', 'LLGGGL', 'LGLLGG',
+	'LGGLLG', 'LGGGLL', 'LGLGLG', 'LGLGGL', 'LGGLGL'
+];
+
+// Calculate the checksum digit
+// https://en.wikipedia.org/wiki/International_Article_Number_(EAN)#Calculation_of_checksum_digit
+const checksum = (number) => {
+	const res = number
+		.substr(0, 12)
+		.split('')
+		.map((n) => +n)
+		.reduce((sum, a, idx) => (
+			idx % 2 ? sum + a * 3 : sum + a
+		), 0);
+
+	return (10 - (res % 10)) % 10;
+};
+
+class EAN13 extends EAN {
+
+	constructor(data, options) {
+		// Add checksum if it does not exist
+		if (/^[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]$/.test(data)) {
+			data += checksum(data);
+		}
+
+		super(data, options);
+
+		// Adds a last character to the end of the barcode
+		this.lastChar = options.lastChar;
+	}
+
+	valid() {
+		return (
+			/^[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]$/.test(this.data) &&
+			+this.data[12] === checksum(this.data)
+		);
+	}
+
+	leftText() {
+		return super.leftText(1, 6);
+	}
+
+	leftEncode() {
+		const data = this.data.substr(1, 6);
+		const structure = EAN13_STRUCTURE[this.data[0]];
+		return super.leftEncode(data, structure);
+	}
+
+	rightText() {
+		return super.rightText(7, 6);
+	}
+
+	rightEncode() {
+		const data = this.data.substr(7, 6);
+		return super.rightEncode(data, 'RRRRRR');
+	}
+
+}
+
+module.exports = EAN13;

apps/cards/EAN8.js

@@ -0,0 +1,82 @@
+// Encoding documentation:
+// http://www.barcodeisland.com/ean8.phtml
+/*
+ * JS source adapted from https://github.com/lindell/JsBarcode
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Johan Lindell (johan@lindell.me)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+const EAN = require("cards.EAN.js");
+
+// Calculate the checksum digit
+const checksum = (number) => {
+	const res = number
+		.substr(0, 7)
+		.split('')
+		.map((n) => +n)
+		.reduce((sum, a, idx) => (
+			idx % 2 ? sum + a : sum + a * 3
+		), 0);
+
+	return (10 - (res % 10)) % 10;
+};
+
+class EAN8 extends EAN {
+
+	constructor(data, options) {
+		// Add checksum if it does not exist
+		if (/^[0-9][0-9][0-9][0-9][0-9][0-9][0-9]$/.test(data)) {
+			data += checksum(data);
+		}
+
+		super(data, options);
+	}
+
+	valid() {
+		return (
+			/^[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]$/.test(this.data) &&
+			+this.data[7] === checksum(this.data)
+		);
+	}
+
+	leftText() {
+		return super.leftText(0, 4);
+	}
+
+	leftEncode() {
+		const data = this.data.substr(0, 4);
+		return super.leftEncode(data, 'LLLL');
+	}
+
+	rightText() {
+		return super.rightText(4, 4);
+	}
+
+	rightEncode() {
+		const data = this.data.substr(4, 4);
+		return super.rightEncode(data, 'RRRR');
+	}
+
+}
+
+module.exports = EAN8;

apps/cards/UPC.js

@@ -0,0 +1,79 @@
+// Encoding documentation:
+// https://en.wikipedia.org/wiki/Universal_Product_Code#Encoding
+/*
+ * JS source adapted from https://github.com/lindell/JsBarcode
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Johan Lindell (johan@lindell.me)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+const encode = require("cards.encode.js");
+const Barcode = require("cards.Barcode.js");
+
+class UPC extends Barcode{
+	constructor(data, options){
+		// Add checksum if it does not exist
+		if(/^[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]$/.test(data)){
+			data += checksum(data);
+		}
+
+		super(data, options);
+	}
+
+	valid(){
+		return /^[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]$/.test(this.data) &&
+			this.data[11] == checksum(this.data);
+	}
+
+	encode(){
+		var result = "";
+
+		result += "101";
+		result += encode(this.data.substr(0, 6), "LLLLLL");
+		result += "01010";
+		result += encode(this.data.substr(6, 6), "RRRRRR");
+		result += "101";
+
+		return {
+			data: result,
+			text: this.text
+		};
+	}
+}
+
+// Calulate the checksum digit
+// https://en.wikipedia.org/wiki/International_Article_Number_(EAN)#Calculation_of_checksum_digit
+function checksum(number){
+	var result = 0;
+
+	var i;
+	for(i = 1; i < 11; i += 2){
+		result += parseInt(number[i]);
+	}
+	for(i = 0; i < 11; i += 2){
+		result += parseInt(number[i]) * 3;
+	}
+
+	return (10 - (result % 10)) % 10;
+}
+
+module.exports = { UPC, checksum };