File: ClangdTests.swift

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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2018 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//

import LanguageServerProtocol
import SKTestSupport
import XCTest

final class ClangdTests: XCTestCase {
  func testClangdGoToInclude() async throws {
    let project = try await MultiFileTestProject(files: [
      "Object.h": "",
      "main.c": """
      #include 1️⃣"Object.h"
      """,
    ])
    let (mainUri, positions) = try project.openDocument("main.c")
    let headerUri = try project.uri(for: "Object.h")

    let goToInclude = DefinitionRequest(
      textDocument: TextDocumentIdentifier(mainUri),
      position: positions["1️⃣"]
    )
    let resp = try await project.testClient.send(goToInclude)

    let locationsOrLinks = try XCTUnwrap(resp, "No response for go-to-#include")
    switch locationsOrLinks {
    case .locations(let locations):
      XCTAssert(!locations.isEmpty, "Found no locations for go-to-#include")
      if let loc = locations.first {
        XCTAssertEqual(loc.uri, headerUri)
      }
    case .locationLinks(let locationLinks):
      XCTAssert(!locationLinks.isEmpty, "Found no location links for go-to-#include")
      if let link = locationLinks.first {
        XCTAssertEqual(link.targetUri, headerUri)
      }
    }
  }

  func testClangdGoToDefinitionWithoutIndex() async throws {
    let project = try await MultiFileTestProject(files: [
      "Object.h": """
      struct Object {
        int field;
      };
      """,
      "main.c": """
      #include "Object.h"

      int main(int argc, const char *argv[]) {
        struct 1️⃣Object *obj;
      }
      """,
    ])

    let (mainUri, positions) = try project.openDocument("main.c")
    let headerUri = try project.uri(for: "Object.h")

    let goToDefinition = DefinitionRequest(
      textDocument: TextDocumentIdentifier(mainUri),
      position: positions["1️⃣"]
    )
    let resp = try await project.testClient.send(goToDefinition)

    let locationsOrLinks = try XCTUnwrap(resp, "No response for go-to-definition")
    switch locationsOrLinks {
    case .locations(let locations):
      XCTAssert(!locations.isEmpty, "Found no locations for go-to-definition")
      if let loc = locations.first {
        XCTAssertEqual(loc.uri, headerUri)
      }
    case .locationLinks(let locationLinks):
      XCTAssert(!locationLinks.isEmpty, "Found no location links for go-to-definition")
      if let link = locationLinks.first {
        XCTAssertEqual(link.targetUri, headerUri)
      }
    }
  }

  func testClangdGoToDeclaration() async throws {
    let project = try await MultiFileTestProject(files: [
      "Object.h": """
      struct Object {
        int field;
      };

      struct Object * newObject();
      """,
      "main.c": """
      #include "Object.h"

      int main(int argc, const char *argv[]) {
        struct Object *obj = 1️⃣newObject();
      }
      """,
    ])

    let (mainUri, positions) = try project.openDocument("main.c")
    let headerUri = try project.uri(for: "Object.h")

    let goToInclude = DeclarationRequest(
      textDocument: TextDocumentIdentifier(mainUri),
      position: positions["1️⃣"]
    )
    let resp = try await project.testClient.send(goToInclude)

    let locationsOrLinks = try XCTUnwrap(resp, "No response for go-to-declaration")
    switch locationsOrLinks {
    case .locations(let locations):
      XCTAssert(!locations.isEmpty, "Found no locations for go-to-declaration")
      if let loc = locations.first {
        XCTAssertEqual(loc.uri, headerUri)
      }
    case .locationLinks(let locationLinks):
      XCTAssert(!locationLinks.isEmpty, "Found no location links for go-to-declaration")
      if let link = locationLinks.first {
        XCTAssertEqual(link.targetUri, headerUri)
      }
    }
  }
}