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796ee27b3a
* fix(scripts): keep format-docs output tails UTF-8 safe When formatter (oxfmt) error output exceeds the 16 KiB tail cap and the retained byte window starts inside a multibyte UTF-8 character, the diagnostic tail would begin with a replacement character (�). Add a decodeUtf8Tail helper that skips leading UTF-8 continuation bytes before decoding the byte suffix, matching the existing pattern in scripts/run-additional-boundary-checks.mjs (#109167). Keep the existing 16 KiB cap and ASCII behavior unchanged. * refactor(scripts): share UTF-8-safe output tails Co-authored-by: 陈志强0668000989 <chen.zhiqiang1@xydigit.com> * test(scripts): prove real formatter UTF-8 failures --------- Co-authored-by: Peter Steinberger <steipete@gmail.com>
32 lines
765 B
JavaScript
32 lines
765 B
JavaScript
// Keeps child-process diagnostic tails byte-bounded without splitting UTF-8 characters.
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function outputText(value) {
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if (typeof value === "string") {
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return value;
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}
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if (Buffer.isBuffer(value)) {
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return value.toString("utf8");
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}
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return "";
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}
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function decodeUtf8Tail(buffer) {
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let start = 0;
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while (start < buffer.length && (buffer[start] & 0b1100_0000) === 0b1000_0000) {
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start += 1;
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}
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return buffer.subarray(start).toString("utf8");
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}
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export function outputTail(value, maxBytes) {
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const text = outputText(value).trim();
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if (!text) {
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return "";
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}
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const bytes = Buffer.from(text, "utf8");
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if (bytes.byteLength <= maxBytes) {
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return text;
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}
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return decodeUtf8Tail(bytes.subarray(bytes.byteLength - maxBytes));
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}
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