[PATCH] D39430: [clangd] formatting: don't ignore style

[Ilya Biryukov via Phabricator via cfe-commits]

ilya-biryukov added inline comments.


================
Comment at: clangd/ClangdServer.h:289
+  llvm::Expected<std::vector<tooling::Replacement>>
+  formatRange(llvm::StringRef Code, PathRef File, Range Rng);
+
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rwols wrote:
> ilya-biryukov wrote:
> > Why do we accept `Code` as a parameter here instead of getting it internally?
> > 
> > Maybe we should consider moving this method out of `ClangdServer`? Its signature looks pretty self-contained now.
> There are a couple intertwined problems:
> 
> 1. replacementsToEdits wants llvm::StringRef Code
> 2. ClangdServer::formatCode wants llvm::StringRef Code
> 3. ClangdServer::getDocument returns an std::string
> 
> So yes, in principle you can call getDocument when you need it for replacementsToEdits, and you can let formatCode itself call getDocument for clang::format::getStyle. But then we create two copies of the document contents for one LSP request.
> 
> If getDocument returned an llvm::StringRef, I'd probably vote for removing the Code argument everywhere and call getDocument as needed.
Oh, I see. Calling `getDocument` twice does not really make sense.  
Maybe we could move a call to `replacementsToEdits` into `formatOnFile` and make it return `vector<TextEdit>`?  Seems to be solving both problems.

We could've made `getDocument` return `StringRef`, but we'd have to be more careful to ensure it's actually copied when we're scheduling async operations, worth a separate review.


https://reviews.llvm.org/D39430