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uni_modules/uview-next/components/u-barcode/JsBarcode/barcodes/CODE128/auto.js

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+import { A_START_CHAR, B_START_CHAR, C_START_CHAR, A_CHARS, B_CHARS, C_CHARS } from './constants';
+
+// Match Set functions
+const matchSetALength = (string) => string.match(new RegExp(`^${A_CHARS}*`))[0].length;
+const matchSetBLength = (string) => string.match(new RegExp(`^${B_CHARS}*`))[0].length;
+const matchSetC = (string) => string.match(new RegExp(`^${C_CHARS}*`))[0];
+
+// CODE128A or CODE128B
+function autoSelectFromAB(string, isA){
+	const ranges = isA ? A_CHARS : B_CHARS;
+	const untilC = string.match(new RegExp(`^(${ranges}+?)(([0-9]{2}){2,})([^0-9]|$)`));
+
+	if (untilC) {
+		return (
+			untilC[1] +
+			String.fromCharCode(204) +
+			autoSelectFromC(string.substring(untilC[1].length))
+		);
+	}
+
+	const chars = string.match(new RegExp(`^${ranges}+`))[0];
+
+	if (chars.length === string.length) {
+		return string;
+	}
+
+	return (
+		chars +
+		String.fromCharCode(isA ? 205 : 206) +
+		autoSelectFromAB(string.substring(chars.length), !isA)
+	);
+}
+
+// CODE128C
+function autoSelectFromC(string) {
+	const cMatch = matchSetC(string);
+	const length = cMatch.length;
+
+	if (length === string.length) {
+		return string;
+	}
+
+	string = string.substring(length);
+
+	// Select A/B depending on the longest match
+	const isA = matchSetALength(string) >= matchSetBLength(string);
+	return cMatch + String.fromCharCode(isA ? 206 : 205) + autoSelectFromAB(string, isA);
+}
+
+// Detect Code Set (A, B or C) and format the string
+export default (string) => {
+	let newString;
+	const cLength = matchSetC(string).length;
+
+	// Select 128C if the string start with enough digits
+	if (cLength >= 2) {
+		newString = C_START_CHAR + autoSelectFromC(string);
+	} else {
+		// Select A/B depending on the longest match
+		const isA = matchSetALength(string) > matchSetBLength(string);
+		newString = (isA ? A_START_CHAR : B_START_CHAR) + autoSelectFromAB(string, isA);
+	}
+
+	return newString.replace(
+		/[\xCD\xCE]([^])[\xCD\xCE]/, // Any sequence between 205 and 206 characters
+		(match, char) => String.fromCharCode(203) + char
+	);
+};