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sax-parser.js
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sax-parser.js
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import { readFile } from 'node:fs/promises';
import format from 'human-format';
import promisifyEvent from 'promisify-event';
import memwatch from '@airbnb/node-memwatch';
import { SAXParser } from '../../packages/parse5-sax-parser/dist/index.js';
main();
async function main() {
let parsedDataSize = 0;
let maxMemUsage = 0;
let startDate = null;
let endDate = null;
const heapDiffMeasurement = new memwatch.HeapDiff();
let heapDiff = null;
memwatch.on('stats', (stats) => {
maxMemUsage = Math.max(maxMemUsage, stats.used_heap_size);
});
startDate = new Date();
const parserPromise = parse().then((dataSize) => {
parsedDataSize = dataSize;
endDate = new Date();
heapDiff = heapDiffMeasurement.end();
});
await Promise.all([
parserPromise,
promisifyEvent(memwatch, 'stats'), // NOTE: we need at least one `stats` result
]);
printResults(parsedDataSize, startDate, endDate, heapDiff, maxMemUsage);
}
async function parse() {
const data = await readFile(new URL('../../test/data/huge-page/huge-page.html', import.meta.url), 'utf8');
let parsedDataSize = 0;
const stream = new SAXParser();
for (let i = 0; i < 200; i++) {
parsedDataSize += data.length;
stream.write(data);
}
stream.end();
await promisifyEvent(stream, 'finish');
return parsedDataSize;
}
function getDuration(startDate, endDate) {
const scale = new format.Scale({
seconds: 1,
minutes: 60,
hours: 3600,
});
return format((endDate - startDate) / 1000, { scale });
}
function printResults(parsedDataSize, startDate, endDate, heapDiff, maxMemUsage) {
console.log('Input data size:', format(parsedDataSize, { unit: 'B' }));
console.log('Duration:', getDuration(startDate, endDate));
console.log('Memory before:', heapDiff.before.size);
console.log('Memory after:', heapDiff.after.size);
console.log('Memory max:', format(maxMemUsage, { unit: 'B' }));
}