javascript-barcode-reader/dist/lib/src/code-39/index.js

Simple & Fast Barcode decoder for Browser and Node.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.decoder = void 0;
const CHAR_SET = {
    nnnwwnwnn: '0',
    wnnwnnnnw: '1',
    nnwwnnnnw: '2',
    wnwwnnnnn: '3',
    nnnwwnnnw: '4',
    wnnwwnnnn: '5',
    nnwwwnnnn: '6',
    nnnwnnwnw: '7',
    wnnwnnwnn: '8',
    nnwwnnwnn: '9',
    wnnnnwnnw: 'A',
    nnwnnwnnw: 'B',
    wnwnnwnnn: 'C',
    nnnnwwnnw: 'D',
    wnnnwwnnn: 'E',
    nnwnwwnnn: 'F',
    nnnnnwwnw: 'G',
    wnnnnwwnn: 'H',
    nnwnnwwnn: 'I',
    nnnnwwwnn: 'J',
    wnnnnnnww: 'K',
    nnwnnnnww: 'L',
    wnwnnnnwn: 'M',
    nnnnwnnww: 'N',
    wnnnwnnwn: 'O',
    nnwnwnnwn: 'P',
    nnnnnnwww: 'Q',
    wnnnnnwwn: 'R',
    nnwnnnwwn: 'S',
    nnnnwnwwn: 'T',
    wwnnnnnnw: 'U',
    nwwnnnnnw: 'V',
    wwwnnnnnn: 'W',
    nwnnwnnnw: 'X',
    wwnnwnnnn: 'Y',
    nwwnwnnnn: 'Z',
    nwnnnnwnw: '-',
    wwnnnnwnn: '.',
    nwwnnnwnn: ' ',
    nwnwnwnnn: '$',
    nwnwnnnwn: '/',
    nwnnnwnwn: '+',
    nnnwnwnwn: '%',
    nwnnwnwnn: '*',
};
function decoder(lines) {
    const code = [];
    const barThreshold = Math.ceil(lines.reduce((pre, item) => pre + item, 0) / lines.length);
    // Read one encoded character at a time.
    while (lines.length > 0) {
        const sequenceBar = lines
            .splice(0, 10)
            .map(line => (line > barThreshold ? 'w' : 'n'))
            .slice(0, 9)
            .join('');
        code.push(CHAR_SET[sequenceBar]);
    }
    if (code.pop() !== '*' || code.shift() !== '*')
        return '';
    return code.join('');
}
exports.decoder = decoder;
//# sourceMappingURL=index.js.map