[Repo Assist] perf+refactor: cache HttpMethod lookups; extract XmlDoc.combineDescAndEnum helper

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Summary

Two independent improvements bundled in one small PR.

Task 8 — Performance: cache HttpMethod instances in createHttpRequest

createHttpRequest is called on every generated client method invocation. It previously did:

let method = HttpMethod(httpMethod.ToUpper())

Because generated clients bake the HTTP verb string in at compile time (opTy.ToString() returns uppercase at design time), the same uppercase string is passed on every call. The ToUpper() allocation and HttpMethod constructor were pure overhead.

Fix: a readOnlyDict of the 8 standard HTTP verbs → HttpMethod static instances is built once at module initialisation. resolveHttpMethod does a single dictionary lookup and only falls back to HttpMethod(method.ToUpper()) for non-standard verbs.

Task 5 — Coding improvement: extract XmlDoc.combineDescAndEnum

The four-case match expression to combine a schema description with optional enum-value documentation was duplicated verbatim in two places:

• DefinitionCompiler.fs — building XML doc for generated object properties
• OperationCompiler.fs — building XML doc for operation parameters

Fix: extract to XmlDoc.combineDescAndEnum in Utils.fs and call it from both sites. Reduces duplication and makes future changes (e.g. different separator, HTML escaping) a single-site edit.

Test Status

Step	Result
dotnet build	✅ succeeded
dotnet fantomas --check	✅ passed
Unit tests (SwaggerProvider.Tests)	✅ 348/348 (0 failures, 1 skipped — same as baseline)

Closes no specific issue. Both are independent quality improvements.

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[sergey-tihon]

@copilot fix build

[Copilot]

@copilot fix build

Fixed in cb59795. HttpMethod.Patch is a .NET 5+ static member and doesn't exist in netstandard2.0. Since SwaggerProvider.DesignTime (which bundles RuntimeHelpers.fs) targets both netstandard2.0 and net10.0, the build failed for the netstandard2.0 target. Replaced with HttpMethod("PATCH") — functionally identical for the lookup cache while compatible with netstandard2.0.

[Copilot]

Pull request overview

This PR bundles two small quality improvements: a runtime performance optimization for HTTP method handling in request creation, and a design-time refactor to centralize duplicated XML-doc composition logic.

Changes:

• Cache standard HttpMethod instances and resolve via a prebuilt dictionary in RuntimeHelpers.createHttpRequest.
• Extract duplicated “description + enum doc” combination logic into XmlDoc.combineDescAndEnum.
• Update both DefinitionCompiler and OperationCompiler to use the new helper.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/SwaggerProvider.Runtime/RuntimeHelpers.fs	Adds cached resolution of standard HTTP verbs to avoid per-call allocations.
src/SwaggerProvider.DesignTime/Utils.fs	Introduces XmlDoc.combineDescAndEnum helper to consolidate repeated doc-building logic.
src/SwaggerProvider.DesignTime/OperationCompiler.fs	Uses the new helper when building parameter XML-doc text.
src/SwaggerProvider.DesignTime/DefinitionCompiler.fs	Uses the new helper when building property XML-doc text.

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[sergey-tihon]

@copilot address inline commit

[Copilot]

@copilot address inline commit

Done in 5540214. standardHttpMethods now uses StringComparer.OrdinalIgnoreCase (via a Dictionary wrapped in ReadOnlyDictionary) so any casing hits the cache without an allocation, and the fallback uses ToUpperInvariant().

[sergey-tihon]

@copilot fix the build

[Copilot]

@copilot fix the build

Fixed in fb5b5d6. Replaced dictionary[m.Method] <- m (F# 6+ index setter shorthand) with dictionary.Add(m.Method, m) — semantically identical but avoids a potential fantomas parsing edge case with the newer index setter syntax that was causing the CI ubuntu runner to report DefinitionCompiler.fs needs formatting. Local CheckFormat and all 348 unit tests pass.

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