worker.js


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import CSVParse from './csv-parse.mjs';

let stripChevron = true;
let threshold = 0;
let ignoreLines = 0;
let sequenceNames = [];

function process(row) {
    let name = row[0];
    if (name === undefined || /^\s*$/.test(name)) {
        return;
    }
    if (ignoreLines > 0) {
        ignoreLines--;
        return;
    }
    if (stripChevron && name[0] === '>') {
        name = name.substring(1);
    }
    sequenceNames.push(name);

    let i = 0;
    for (const col of row) {
        const val = Number(col);
        if (isNaN(val)) {
            continue;
        }
        if (val >= threshold && name !== sequenceNames[i]) {
            postMessage([name, sequenceNames[i], val]);
        }
        i++;
    }
}

onmessage = e => {
    console.debug('got message', e);
    console.debug('reading file');

    console.debug('e.data', e.data);
    stripChevron = e.data.stripChevron;
    threshold = e.data.threshold;
    const { ignoreHeader, file } = e.data;

    const reader = new FileReader();
    reader.onload = e => {
        const parser = new CSVParse();
        for (const c of e.target.result) {
            parser.push(c);
        }
        if (ignoreHeader) {
            ignoreLines = 1;
        }
        parser.results.forEach(process);
    }
    reader.progress = e => {
        console.debug('reader.progress', e);
    }
    reader.readAsText(file);
}