RoslynSource Text #1123
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RoslynSource Text #1123
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faster at individual lines than Roslyn SourceText but slower at whole file creation
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TheAngryByrd
commented
Jun 27, 2023
| open FSharp.UMX | ||
| open System.Collections.Generic | ||
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| let fileContents = IO.File.ReadAllText(@"C:\Users\jimmy\Repositories\public\TheAngryByrd\span-playground\Romeo and Juliet by William Shakespeare.txt") |
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Using this a just a giant text file. Should I include it or leave as an exercise for the others?
| Microsoft.CodeAnalysis.Text.TextSpan(startPosition, endPosition - startPosition) | ||
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| /// A SourceText with operations commonly used in FsAutocomplete | ||
| type IFSACSourceText = |
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Extracted interface for FSAC's source text impl
| static member Create(path: string<LocalPath>, text, version) = | ||
| let touched = | ||
| let path = UMX.untag path | ||
| type ISourceTextFactory = |
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Interface for pivoting between implementations.
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| override _.GetHashCode() = |
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Taken from Fsharp repo
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| let sourceTextFactories: (string * ISourceTextFactory) list = [ | ||
| "NamedText", NamedTextFactory() | ||
| "RosylinSourceText", RoslynSourceTextFactory() | ||
| ] |
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Running tests for both SourceText implementations
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Formatting check is failing due to a bug in fantomas: fsprojects/fantomas#2914 |
baronfel
approved these changes
Jun 30, 2023
Yeah I gotta make an ionide side flag. |
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WHAT
🤖 Generated by Copilot at a6a0682
Refactor
AdaptiveFSharpLspServerto useIFSACSourceTextinterface for source text representation and improve readability.🤖 Generated by Copilot at a6a0682
🔧📝🚀
WHY
This uses the SourceText from the
Microsoft.CodeAnalysispackage. The Visual Studio tooling uses this. The implementation here tends to give more favorable results when it comes to memory usage and reducing Large Object Heap allocations.I also have a very bespoke implementation I attempted awhile ago with FSharp.Data.Adaptive and handrolling a lot of text manipulation using Spans. This probably will get removed before this PR is ready.
Below are some of the benchmarks.
Nrefers to the number of changes to a text file.This does seem like a win. It allocates about 25% less though it does report slower for lots of rapid changes.
Also after running
dotnet-trace collect -p <pid> --duration 00:00:30 --profile gc-verboseand playing around with large files, we tend to not get hit with as many Large Object Heap issues.Things left to do:
HOW
🤖 Generated by Copilot at a6a0682
IFSACSourceTextinstead of the typeNamedTextin various functions, to allow different implementations for different editors or scenarios (link, link, link)namedTextbinding in thehandlerfunction inAdaptiveFSharpLspServer.fs, to make the code more consistent and readable (link, link, link, link, link, link, link)