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v1.0.0 (Jan 10, 2023)
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@shwestrick shwestrick released this 10 Jan 17:09
· 52 commits to main since this release
v1.0.0
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Learn about vigilant mode.

smlfmt is a custom parser and code formatter for Standard ML.

Features

  • Full support for Standard ML according to the formal definition.
  • Fast -- see performance results below.
  • Usable for large projects.
    • Whole-project formatting via .mlb files using MLton conventions.
  • Helpful error messages with visual code references and syntax highlighting.
  • Support for various SuccessorML syntax extensions.
  • Configurable indentation size and maximum width.

Performance

smlfmt is fast enough for live reformatting on large individual files, and can reformat large projects in seconds.

Here are measurements for smlfmt --preview-only INPUT > out on my MacBook Air (M2, 2022).

Input Size (LoC) Time
src/prettier-print/PrettierExpAndDec.sml 1024 31 ms
src/base/PrettyTabbedDoc.sml 1349 29 ms
src/parse/ParseExpAndDec.sml 1363 28 ms
MLton elaborate-core.fun 3942 104 ms
MLton x86-allocate-registers.fun 11034 216 ms
Entire MLton source code (mlton.mlb) 160000 (approx.) 6.6s

(Timings are averages reported by hyperfine.)

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