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https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Richard Smith
c78751338b
Add support for "jump to declaration", "find references", type information on hover. This support is strictly single-file for now; only references and declarations within the same file are found. We could go a bit beyond that, but to properly handle cross-file references we'll need to build an index and a compilation database, which is beyond the scope of this change. On hover, we provide the type information for the instruction under the cursor as-is. This is frequently not very useful, as the type of a function F is simply "<type of F>", but is a starting point for richer information. Assisted-by: Claude Code
56 lines
2.3 KiB
C++
56 lines
2.3 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#include <utility>
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#include "llvm/ADT/STLExtras.h"
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#include "toolchain/language_server/handle.h"
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namespace Carbon::LanguageServer {
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// Picks the encoding used to measure `Position::character` on the wire.
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// Use UTF-8 if offered, since Carbon source is natively UTF-8. Otherwise fall
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// back to UTF-16, to support VS Code and old LSP clients.
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static auto NegotiatePositionEncoding(
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const clang::clangd::ClientCapabilities& capabilities)
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-> clang::clangd::OffsetEncoding {
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if (capabilities.PositionEncodings &&
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llvm::is_contained(*capabilities.PositionEncodings,
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clang::clangd::OffsetEncoding::UTF8)) {
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return clang::clangd::OffsetEncoding::UTF8;
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}
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return clang::clangd::OffsetEncoding::UTF16;
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}
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auto HandleInitialize(
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Context& context, const clang::clangd::InitializeParams& params,
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llvm::function_ref<auto(llvm::Expected<llvm::json::Object>)->void> on_done)
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-> void {
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auto encoding = NegotiatePositionEncoding(params.capabilities);
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context.SetPositionEncoding(encoding);
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llvm::json::Object capabilities{{"declarationProvider", true},
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{"definitionProvider", true},
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{"documentSymbolProvider", true},
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{"hoverProvider", true},
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{"positionEncoding", encoding},
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{"referencesProvider", true},
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{"textDocumentSync", /*Incremental=*/2},
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{"typeDefinitionProvider", true}};
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llvm::json::Object reply{{"capabilities", std::move(capabilities)}};
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on_done(reply);
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}
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// Implements `initialized`:
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// https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#initialized
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auto HandleInitialized(Context& /*context*/,
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const clang::clangd::NoParams& /*params*/) -> void {
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// Nothing to do, but every client sends this, so we handle it rather than
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// warning about an unsupported notification.
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// TODO: This is when we would use `client/registerCapability` for any
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// capabilities we want to register dynamically.
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}
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} // namespace Carbon::LanguageServer
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