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Estimate expected VecBuffer size (#6612)

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Micha Reiser 2023-08-16 15:31:31 +02:00 • committed by GitHub
parent 95f78821ad
commit 7ee2ae8395
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1 changed files with 6 additions and 2 deletions
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8
crates/ruff_formatter/src/lib.rs
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@ -778,9 +778,13 @@ pub fn format<Context>(
where
Context: FormatContext,
{
let source_length = context.source_code().as_str().len();
// Use a simple heuristic to guess the number of expected format elements.
// See [#6612](https://github.com/astral-sh/ruff/pull/6612) for more details on how the formula was determined. Changes to our formatter, or supporting
// more languages may require fine tuning the formula.
let estimated_buffer_size = source_length / 2;
let mut state = FormatState::new(context);
let mut buffer =
VecBuffer::with_capacity(state.context().source_code().as_str().len(), &mut state);
let mut buffer = VecBuffer::with_capacity(estimated_buffer_size, &mut state);
buffer.write_fmt(arguments)?;