Optimize pretty printing performance #913
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bnbarham
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ahoppen,
allevato and
shawnhyam
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CC @macshome |
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Some instruction counts (for formatting swift-syntax 509.0.0):
Still worse than it was, but we're doing a fair bit more work so that seems inevitable. |
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rintaro
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Jan 10, 2025
rintaro
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Jan 10, 2025
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I would do: if let lastNewlineIndex = text.utf8.lastIndex(of: UInt8(ascii: "\n")) {
let lastLineStart = text.utf8.index(after: lastNewlineIndex)
lineNumber += text[..<lastLineStart].utf8.count(where: {$0 == UInt8(ascii: "\n")})
column = text[lastLineStart...].count
} else {
column += text.count
} |
swift-format#883 fixed outputting incorrect line numbers, but introduced a performance regression. swift-format#901 improved this back to around the original, but had to be reverted as it introduced a an issue due to counting codepoints rather than characters. Introduce a similar optimization again, but only for the first portion of the string (prior to the last newline). Fixes swift-format#894 again.
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Ah, thanks @rintaro. We're now down to 68032409793 👍 |
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#883 fixed outputting incorrect line numbers, but introduced a performance regression. #901 improved this back to around the original, but had to be reverted as it introduced a an issue due to counting codepoints rather than characters.
Introduce a similar optimization again, but only for the first portion of the string (prior to the last newline).
Fixes #894 again.