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Implement lsp/formatting for Carbon::LanguageServer (#7688)

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Implements formatting support within LSP. Current implementation
performs while file formatting, we just replace file with output of
Carbon::Format()

https://github.com/carbon-language/carbon-lang/pull/7687 independently
improves formatting so that this output is somewhat decent.

Assisted-With: Gemini / Antigravity
This commit is contained in:
DavidLoftus
2026-08-31 16:38:38 +00:00
committed by GitHub
parent f519cccaf2
commit dc2ee5bd5e
31 changed files with 379 additions and 25 deletions
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toolchain/language_server/testdata/formatting/unknown.carbon
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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/language_server/testdata/formatting/unknown.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/language_server/testdata/formatting/unknown.carbon
// CHECK:STDERR: /test.carbon: warning: unknown file requested [LanguageServerFileUnknown]
// CHECK:STDERR:
// --- STDIN
[[@LSP-CALL:initialize:"capabilities": {}]]
[[@LSP-CALL:textDocument/formatting:
"textDocument": {"uri": "file:/test.carbon"},
"options": {"tabSize": 2, "insertSpaces": true}
]]
[[@LSP-CALL:shutdown]]
[[@LSP-NOTIFY:exit]]
// CHECK:STDOUT: Content-Length: 394{{\r}}
// CHECK:STDOUT: {{\r}}
// CHECK:STDOUT: {
// CHECK:STDOUT: "id": 1,
// CHECK:STDOUT: "jsonrpc": "2.0",
// CHECK:STDOUT: "result": {
// CHECK:STDOUT: "capabilities": {
// CHECK:STDOUT: "declarationProvider": true,
// CHECK:STDOUT: "definitionProvider": true,
// CHECK:STDOUT: "documentFormattingProvider": true,
// CHECK:STDOUT: "documentSymbolProvider": true,
// CHECK:STDOUT: "hoverProvider": true,
// CHECK:STDOUT: "positionEncoding": "utf-16",
// CHECK:STDOUT: "referencesProvider": true,
// CHECK:STDOUT: "textDocumentSync": 2,
// CHECK:STDOUT: "typeDefinitionProvider": true
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT: }Content-Length: 51{{\r}}
// CHECK:STDOUT: {{\r}}
// CHECK:STDOUT: {
// CHECK:STDOUT: "id": 3,
// CHECK:STDOUT: "jsonrpc": "2.0",
// CHECK:STDOUT: "result": null
// CHECK:STDOUT: }