@jbrowse/core/esm/util/parseLineByLine.js

JBrowse 2 core libraries used by plugins

import { getProgressDisplayStr } from "./index.js";
export function parseLineByLine(buffer, lineCallback, statusCallback = () => { }) {
    const decoder = new TextDecoder('utf8');
    let blockStart = 0;
    let i = 0;
    while (blockStart < buffer.length) {
        const n = buffer.indexOf(10, blockStart);
        const lineEnd = n === -1 ? buffer.length : n;
        const b = buffer.subarray(blockStart, lineEnd);
        const line = decoder.decode(b).trim();
        if (line) {
            const shouldContinue = lineCallback(line, i);
            if (shouldContinue === false) {
                break;
            }
        }
        if (i++ % 10_000 === 0) {
            statusCallback(`Loading ${getProgressDisplayStr(blockStart, buffer.length)}`);
        }
        blockStart = lineEnd + 1;
    }
}