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// Encoding documentation: |
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// https://en.wikipedia.org/wiki/Universal_Product_Code#Encoding |
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import encode from './encoder'; |
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import Barcode from "../Barcode.js"; |
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class UPC extends Barcode{ |
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constructor(data, options){ |
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// Add checksum if it does not exist |
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if(data.search(/^[0-9]{11}$/) !== -1){ |
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data += checksum(data); |
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} |
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super(data, options); |
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this.displayValue = options.displayValue; |
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// Make sure the font is not bigger than the space between the guard bars |
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if(options.fontSize > options.width * 10){ |
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this.fontSize = options.width * 10; |
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} |
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else{ |
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this.fontSize = options.fontSize; |
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} |
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// Make the guard bars go down half the way of the text |
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this.guardHeight = options.height + this.fontSize / 2 + options.textMargin; |
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} |
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valid(){ |
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return this.data.search(/^[0-9]{12}$/) !== -1 && |
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this.data[11] == checksum(this.data); |
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} |
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encode(){ |
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if(this.options.flat){ |
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return this.flatEncoding(); |
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} |
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else{ |
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return this.guardedEncoding(); |
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} |
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} |
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flatEncoding(){ |
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var result = ""; |
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result += "101"; |
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result += encode(this.data.substr(0, 6), "LLLLLL"); |
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result += "01010"; |
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result += encode(this.data.substr(6, 6), "RRRRRR"); |
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result += "101"; |
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return { |
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data: result, |
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text: this.text |
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}; |
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} |
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guardedEncoding(){ |
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var result = []; |
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// Add the first digit |
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if(this.displayValue){ |
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result.push({ |
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data: "00000000", |
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text: this.text.substr(0, 1), |
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options: {textAlign: "left", fontSize: this.fontSize} |
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}); |
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} |
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// Add the guard bars |
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result.push({ |
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data: "101" + encode(this.data[0], "L"), |
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options: {height: this.guardHeight} |
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}); |
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// Add the left side |
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result.push({ |
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data: encode(this.data.substr(1, 5), "LLLLL"), |
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text: this.text.substr(1, 5), |
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options: {fontSize: this.fontSize} |
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}); |
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// Add the middle bits |
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result.push({ |
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data: "01010", |
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options: {height: this.guardHeight} |
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}); |
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// Add the right side |
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result.push({ |
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data: encode(this.data.substr(6, 5), "RRRRR"), |
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text: this.text.substr(6, 5), |
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options: {fontSize: this.fontSize} |
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}); |
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// Add the end bits |
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result.push({ |
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data: encode(this.data[11], "R") + "101", |
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options: {height: this.guardHeight} |
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}); |
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// Add the last digit |
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if(this.displayValue){ |
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result.push({ |
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data: "00000000", |
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text: this.text.substr(11, 1), |
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options: {textAlign: "right", fontSize: this.fontSize} |
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}); |
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} |
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return result; |
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} |
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} |
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116
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// Calulate the checksum digit |
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// https://en.wikipedia.org/wiki/International_Article_Number_(EAN)#Calculation_of_checksum_digit |
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export function checksum(number){ |
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var result = 0; |
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120
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121
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var i; |
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for(i = 1; i < 11; i += 2){ |
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result += parseInt(number[i]); |
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} |
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for(i = 0; i < 11; i += 2){ |
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result += parseInt(number[i]) * 3; |
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} |
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128
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129
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return (10 - (result % 10)) % 10; |
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} |
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132
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export default UPC; |
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lindell /
JsBarcode
