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Perf: speed up file comparison

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SukkaW 2025-01-17 21:51:58 +08:00
parent c6bbbf9d4c
commit 6f8d515e7c
1 changed files with 15 additions and 8 deletions
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23
Build/lib/rules/base.ts
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@ -381,32 +381,39 @@ export abstract class RuleOutput<TPreprocessed = unknown> {
abstract mitmSgmodule?(): string[] | null; abstract mitmSgmodule?(): string[] | null;
} }
export async function fileEqual(linesA: string[], source: AsyncIterable<string>): Promise<boolean> { export async function fileEqual(linesA: string[], source: AsyncIterable<string> | Iterable<string>): Promise<boolean> {
if (linesA.length === 0) { if (linesA.length === 0) {
return false; return false;
} }
const linesABound = linesA.length - 1;
let index = -1; let index = -1;
for await (const lineB of source) { for await (const lineB of source) {
index++; index++;
if (index > linesA.length - 1) { if (index > linesABound) {
return (index === linesA.length && lineB === ''); return (index === linesA.length && lineB.length === 0);
} }
const lineA = linesA[index]; const lineA = linesA[index];
if (lineA[0] === '#' && lineB[0] === '#') { const firstCharA = lineA.charCodeAt(0);
const firstCharB = lineB.charCodeAt(0);
if (firstCharA === 35 /* # */ && firstCharB === 35 /* # */) {
continue; continue;
} }
// adguard conf // adguard conf
if (lineA[0] === '!' && lineB[0] === '!') { if (firstCharA === 33 /* ! */ && firstCharB === 33 /* ! */) {
continue; continue;
} }
if ( if (
lineA[0] === '/' firstCharA === 47 /* / */
&& firstCharB === 47 /* / */
&& lineA[1] === '/' && lineA[1] === '/'
&& lineB[0] === '/'
&& lineB[1] === '/' && lineB[1] === '/'
&& lineA[3] === '#' && lineA[3] === '#'
&& lineB[3] === '#' && lineB[3] === '#'
@ -420,7 +427,7 @@ export async function fileEqual(linesA: string[], source: AsyncIterable<string>)
} }
// The file becomes larger // The file becomes larger
return !(index < linesA.length - 1); return !(index < linesABound);
} }
export async function compareAndWriteFile(span: Span, linesA: string[], filePath: string) { export async function compareAndWriteFile(span: Span, linesA: string[], filePath: string) {