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perf(format): add fast path using json stringify/parse #83

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perf(format): add fast path using json stringify/parse #83

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18 changes: 18 additions & 0 deletions src/impl/format.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,24 @@ export function format(documentText: string, range: Range | undefined, options:
}
const eol = getEOL(options, documentText);

if (eol === '\n' && options.insertSpaces && !options.keepLines && rangeStart === 0 && rangeEnd === documentText.length) {
try {
let formatted = JSON.stringify(JSON.parse(documentText), null, options?.tabSize || 4);

if (options.insertFinalNewline) {
formatted += '\n';
}

return [{
offset: 0,
length: documentText.length,
content: formatted
}];
} catch (e) {
// ignore because there is an error on JSON and we will try format until we reach that error.
}
}

let numberLineBreaks = 0;

let indentLevel = 0;
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