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Neil
bf87b1290f
* perf(repos): avoid quadratic icon source scans * perf: avoid repeated malformed HTML icon scans * bench: balance icon parser timing samples
56 lines
1.8 KiB
JavaScript
56 lines
1.8 KiB
JavaScript
import assert from 'node:assert/strict'
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import { performance } from 'node:perf_hooks'
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import { extractIconHref } from '../../src/main/repo-icon-source-href.ts'
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// Original production expressions, preserved for the before/after measurement.
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const html =
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/<link\b(?=[^>]*\brel=["'](?:icon|shortcut icon)["'])(?=[^>]*\bhref=["']([^"'?]+))[^>]*>/i
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const object =
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/(?=[^}]*\brel\s*:\s*["'](?:icon|shortcut icon)["'])(?=[^}]*\bhref\s*:\s*["']([^"'?]+))[^}]*/i
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const original = (source) => source.match(html)?.[1] ?? source.match(object)?.[1] ?? null
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function measurePair(source) {
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original(source)
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extractIconHref(source)
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const beforeSamples = []
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const afterSamples = []
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for (let run = 0; run < 5; run++) {
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const measurements = [
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[original, beforeSamples],
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[extractIconHref, afterSamples]
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]
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if (run % 2 === 1) {
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measurements.reverse()
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}
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for (const [fn, samples] of measurements) {
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const started = performance.now()
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fn(source)
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samples.push(performance.now() - started)
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}
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}
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return {
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beforeMs: beforeSamples.sort((a, b) => a - b)[2],
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afterMs: afterSamples.sort((a, b) => a - b)[2]
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}
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}
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const results = []
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for (const size of [8192, 16384, 32768]) {
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for (const shape of ['no icon', 'rel without href', 'unterminated link starts']) {
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const source =
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shape === 'unterminated link starts'
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? '<link '.repeat(Math.floor(size / 6))
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: 'a'.repeat(size) + (shape === 'rel without href' ? ' rel:"icon"' : '')
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assert.equal(extractIconHref(source), original(source))
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const { beforeMs, afterMs } = measurePair(source)
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results.push({
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shape,
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bytes: Buffer.byteLength(source),
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beforeMs,
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afterMs,
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speedup: beforeMs / afterMs
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})
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}
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}
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console.log(JSON.stringify({ node: process.version, platform: process.platform, results }, null, 2))
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