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// Encoding documentation: |
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// https://en.wikipedia.org/wiki/Universal_Product_Code#Encoding |
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// |
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// UPC-E documentation: |
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// https://en.wikipedia.org/wiki/Universal_Product_Code#UPC-E |
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import encode from './encoder'; |
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import Barcode from "../Barcode.js"; |
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import { checksum } from './UPC.js'; |
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const EXPANSIONS = [ |
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"XX00000XXX", |
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"XX10000XXX", |
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"XX20000XXX", |
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"XXX00000XX", |
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"XXXX00000X", |
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"XXXXX00005", |
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"XXXXX00006", |
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"XXXXX00007", |
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"XXXXX00008", |
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"XXXXX00009" |
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]; |
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const PARITIES = [ |
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["EEEOOO", "OOOEEE"], |
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["EEOEOO", "OOEOEE"], |
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["EEOOEO", "OOEEOE"], |
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["EEOOOE", "OOEEEO"], |
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["EOEEOO", "OEOOEE"], |
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["EOOEEO", "OEEOOE"], |
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["EOOOEE", "OEEEOO"], |
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["EOEOEO", "OEOEOE"], |
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["EOEOOE", "OEOEEO"], |
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["EOOEOE", "OEEOEO"] |
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]; |
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class UPCE extends Barcode{ |
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constructor(data, options){ |
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// Code may be 6 or 8 digits; |
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// A 7 digit code is ambiguous as to whether the extra digit |
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// is a UPC-A check or number system digit. |
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super(data, options); |
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this.isValid = false; |
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if(data.search(/^[0-9]{6}$/) !== -1){ |
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this.middleDigits = data; |
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this.upcA = expandToUPCA(data, "0"); |
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this.text = options.text || |
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`${this.upcA[0]}${data}${this.upcA[this.upcA.length - 1]}`; |
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this.isValid = true; |
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} |
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else if(data.search(/^[01][0-9]{7}$/) !== -1){ |
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this.middleDigits = data.substring(1, data.length - 1); |
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this.upcA = expandToUPCA(this.middleDigits, data[0]); |
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if(this.upcA[this.upcA.length - 1] === data[data.length - 1]){ |
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this.isValid = true; |
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} |
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else{ |
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// checksum mismatch |
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return; |
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} |
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} |
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else{ |
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return; |
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} |
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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.isValid; |
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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 += this.encodeMiddleDigits(); |
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result += "010101"; |
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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 UPC-A number system digit beneath the quiet zone |
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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[0], |
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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", |
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options: {height: this.guardHeight} |
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}); |
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// Add the 6 UPC-E digits |
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result.push({ |
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data: this.encodeMiddleDigits(), |
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text: this.text.substring(1, 7), |
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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: "010101", |
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options: {height: this.guardHeight} |
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}); |
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// Add the UPC-A check digit beneath the quiet zone |
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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[7], |
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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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encodeMiddleDigits() { |
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const numberSystem = this.upcA[0]; |
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const checkDigit = this.upcA[this.upcA.length - 1]; |
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const parity = PARITIES[parseInt(checkDigit)][parseInt(numberSystem)]; |
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return encode(this.middleDigits, parity); |
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} |
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} |
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function expandToUPCA(middleDigits, numberSystem) { |
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const lastUpcE = parseInt(middleDigits[middleDigits.length - 1]); |
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const expansion = EXPANSIONS[lastUpcE]; |
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let result = ""; |
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let digitIndex = 0; |
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for(let i = 0; i < expansion.length; i++) { |
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let c = expansion[i]; |
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if (c === 'X') { |
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result += middleDigits[digitIndex++]; |
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} else { |
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result += c; |
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} |
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} |
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result = `${numberSystem}${result}`; |
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return `${result}${checksum(result)}`; |
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} |
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export default UPCE; |
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lindell /
JsBarcode
