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