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Perf: simplify file equal
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SukkaW
2025-03-19 23:56:52 +08:00
parent feb7dc4ba6
commit 9be66afce7
2 changed files with 23 additions and 17 deletions
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24
Build/lib/create-file.ts
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@@ -17,22 +17,24 @@ export async function fileEqual(linesA: string[], source: AsyncIterable<string>
for await (const lineB of source) {
index++;
// b become bigger
if (index > maxIndexA) {
return false;
}
const lineA = linesA[index];
const lineAIsComment = isCommentLine(lineA);
const lineBIsComment = isCommentLine(lineB);
if (lineAIsComment !== lineBIsComment) {
const aFirstChar = lineA.charCodeAt(0);
if (aFirstChar !== lineB.charCodeAt(0)) {
return false;
}
// Now both line are either both comment or both not comment
// Now both line has the same first char
// We only need to compare one of them
if (lineAIsComment) {
if (
aFirstChar === 35 // #
|| aFirstChar === 33 // !
) {
continue;
}
@@ -41,18 +43,10 @@ export async function fileEqual(linesA: string[], source: AsyncIterable<string>
}
}
// b is not smaller than a
return index === maxIndexA;
}
export function isCommentLine(line: string): boolean {
const firstChar = line.charCodeAt(0);
return (
firstChar === 35 // #
|| firstChar === 33 // !
|| (firstChar === 47 && line[1] === '/' && line[3] === '#') // //##
);
}
export async function compareAndWriteFile(span: Span, linesA: string[], filePath: string) {
const linesALen = linesA.length;