Support creation of SKDRequest(Dictionary|Array) from literals

Sources/SourceKitD/SKDRequestArray.swift

@@ -20,6 +20,17 @@ import Musl
 import CRT
 #endif
 
+extension SourceKitD {
+  /// Create a `SKDRequestArray` from the given array.
+  public func array(_ array: [SKDValue]) -> SKDRequestArray {
+    let result = SKDRequestArray(sourcekitd: self)
+    for element in array {
+      result.append(element)
+    }
+    return result
+  }
+}
+
 public final class SKDRequestArray {
   public let array: sourcekitd_object_t?
   public let sourcekitd: SourceKitD
@@ -33,15 +44,32 @@ public final class SKDRequestArray {
     sourcekitd.api.request_release(array)
   }
 
-  public func append(_ value: String) {
-    sourcekitd.api.request_array_set_string(array, -1, value)
-  }
-
-  public func append(_ value: SKDRequestDictionary) {
-    sourcekitd.api.request_array_set_value(array, -1, value.dict)
+  public func append(_ newValue: SKDValue) {
+    switch newValue {
+    case let newValue as String:
+      sourcekitd.api.request_array_set_string(array, -1, newValue)
+    case let newValue as Int:
+      sourcekitd.api.request_array_set_int64(array, -1, Int64(newValue))
+    case let newValue as sourcekitd_uid_t:
+      sourcekitd.api.request_array_set_uid(array, -1, newValue)
+    case let newValue as SKDRequestDictionary:
+      sourcekitd.api.request_array_set_value(array, -1, newValue.dict)
+    case let newValue as SKDRequestArray:
+      sourcekitd.api.request_array_set_value(array, -1, newValue.array)
+    case let newValue as Array<SKDValue>:
+      self.append(sourcekitd.array(newValue))
+    case let newValue as Dictionary<sourcekitd_uid_t, SKDValue>:
+      self.append(sourcekitd.dictionary(newValue))
+    case let newValue as Optional<SKDValue>:
+      if let newValue {
+        self.append(newValue)
+      }
+    default:
+      preconditionFailure("Unknown type conforming to SKDValueProtocol")
+    }
   }
 
-  public static func += (array: SKDRequestArray, other: some Sequence<SKDRequestDictionary>) {
+  public static func += (array: SKDRequestArray, other: some Sequence<SKDValue>) {
     for item in other {
       array.append(item)
     }

Sources/SourceKitD/SKDRequestDictionary.swift

@@ -21,6 +21,34 @@ import Musl
 import CRT
 #endif
 
+/// Values that can be stored in a `SKDRequestDictionary`.
+///
+/// - Warning: `SKDRequestDictionary.subscript` and `SKDRequestArray.append`
+///   switch exhaustively over this protocol.
+///   Do not add new conformances without adding a new case in the subscript and
+///   `append` function.
+public protocol SKDValue {}
+
+extension String: SKDValue {}
+extension Int: SKDValue {}
+extension sourcekitd_uid_t: SKDValue {}
+extension SKDRequestDictionary: SKDValue {}
+extension SKDRequestArray: SKDValue {}
+extension Array<SKDValue>: SKDValue {}
+extension Dictionary<sourcekitd_uid_t, SKDValue>: SKDValue {}
+extension Optional: SKDValue where Wrapped: SKDValue {}
+
+extension SourceKitD {
+  /// Create a `SKDRequestDictionary` from the given dictionary.
+  public func dictionary(_ dict: [sourcekitd_uid_t: SKDValue]) -> SKDRequestDictionary {
+    let result = SKDRequestDictionary(sourcekitd: self)
+    for (key, value) in dict {
+      result.set(key, to: value)
+    }
+    return result
+  }
+}
+
 public final class SKDRequestDictionary {
   public let dict: sourcekitd_object_t?
   public let sourcekitd: SourceKitD
@@ -34,34 +62,30 @@ public final class SKDRequestDictionary {
     sourcekitd.api.request_release(dict)
   }
 
-  public subscript(key: sourcekitd_uid_t?) -> String {
-    get { fatalError("request is set-only") }
-    set { sourcekitd.api.request_dictionary_set_string(dict, key, newValue) }
-  }
-  public subscript(key: sourcekitd_uid_t?) -> Int {
-    get { fatalError("request is set-only") }
-    set { sourcekitd.api.request_dictionary_set_int64(dict, key, Int64(newValue)) }
-  }
-  public subscript(key: sourcekitd_uid_t?) -> sourcekitd_uid_t? {
-    get { fatalError("request is set-only") }
-    set { sourcekitd.api.request_dictionary_set_uid(dict, key, newValue) }
-  }
-  public subscript(key: sourcekitd_uid_t?) -> SKDRequestDictionary {
-    get { fatalError("request is set-only") }
-    set { sourcekitd.api.request_dictionary_set_value(dict, key, newValue.dict) }
-  }
-  public subscript<S>(key: sourcekitd_uid_t?) -> S where S: Sequence, S.Element == String {
-    get { fatalError("request is set-only") }
-    set {
-      let array = SKDRequestArray(sourcekitd: sourcekitd)
-      newValue.forEach { array.append($0) }
-      sourcekitd.api.request_dictionary_set_value(dict, key, array.array)
+  public func set(_ key: sourcekitd_uid_t, to newValue: SKDValue) {
+    switch newValue {
+    case let newValue as String:
+      sourcekitd.api.request_dictionary_set_string(dict, key, newValue)
+    case let newValue as Int:
+      sourcekitd.api.request_dictionary_set_int64(dict, key, Int64(newValue))
+    case let newValue as sourcekitd_uid_t:
+      sourcekitd.api.request_dictionary_set_uid(dict, key, newValue)
+    case let newValue as SKDRequestDictionary:
+      sourcekitd.api.request_dictionary_set_value(dict, key, newValue.dict)
+    case let newValue as SKDRequestArray:
+      sourcekitd.api.request_dictionary_set_value(dict, key, newValue.array)
+    case let newValue as Array<SKDValue>:
+      self.set(key, to: sourcekitd.array(newValue))
+    case let newValue as Dictionary<sourcekitd_uid_t, SKDValue>:
+      self.set(key, to: sourcekitd.dictionary(newValue))
+    case let newValue as Optional<SKDValue>:
+      if let newValue {
+        self.set(key, to: newValue)
+      }
+    default:
+      preconditionFailure("Unknown type conforming to SKDValueProtocol")
     }
   }
-  public subscript(key: sourcekitd_uid_t?) -> SKDRequestArray {
-    get { fatalError("request is set-only") }
-    set { sourcekitd.api.request_dictionary_set_value(dict, key, newValue.array) }
-  }
 }
 
 extension SKDRequestDictionary: CustomStringConvertible {

Sources/SourceKitLSP/Rename.swift

@@ -383,28 +383,28 @@ extension SwiftLanguageServer {
     oldName: String,
     in snapshot: DocumentSnapshot
   ) async throws -> [SyntacticRenameName] {
-    let locations = SKDRequestArray(sourcekitd: sourcekitd)
-    locations += renameLocations.map { renameLocation in
-      let skRenameLocation = SKDRequestDictionary(sourcekitd: sourcekitd)
-      skRenameLocation[keys.line] = renameLocation.line
-      skRenameLocation[keys.column] = renameLocation.utf8Column
-      skRenameLocation[keys.nameType] = renameLocation.usage.uid(keys: keys)
-      return skRenameLocation
-    }
-    let renameLocation = SKDRequestDictionary(sourcekitd: sourcekitd)
-    renameLocation[keys.locations] = locations
-    renameLocation[keys.name] = oldName
-
-    let renameLocations = SKDRequestArray(sourcekitd: sourcekitd)
-    renameLocations.append(renameLocation)
-
-    let skreq = SKDRequestDictionary(sourcekitd: sourcekitd)
-    skreq[keys.request] = requests.find_syntactic_rename_ranges
-    skreq[keys.sourcefile] = snapshot.uri.pseudoPath
-    // find-syntactic-rename-ranges is a syntactic sourcekitd request that doesn't use the in-memory file snapshot.
-    // We need to send the source text again.
-    skreq[keys.sourcetext] = snapshot.text
-    skreq[keys.renamelocations] = renameLocations
+    let locations = sourcekitd.array(
+      renameLocations.map { renameLocation in
+        sourcekitd.dictionary([
+          keys.line: renameLocation.line,
+          keys.column: renameLocation.utf8Column,
+          keys.nameType: renameLocation.usage.uid(keys: keys),
+        ])
+      }
+    )
+    let renameLocation = sourcekitd.dictionary([
+      keys.locations: locations,
+      keys.name: oldName,
+    ])
+
+    let skreq = sourcekitd.dictionary([
+      keys.request: requests.find_syntactic_rename_ranges,
+      keys.sourcefile: snapshot.uri.pseudoPath,
+      // find-syntactic-rename-ranges is a syntactic sourcekitd request that doesn't use the in-memory file snapshot.
+      // We need to send the source text again.
+      keys.sourcetext: snapshot.text,
+      keys.renamelocations: [renameLocation],
+    ])
 
     let syntacticRenameRangesResponse = try await sourcekitd.send(skreq, fileContents: snapshot.text)
     guard let categorizedRanges: SKDResponseArray = syntacticRenameRangesResponse[keys.categorizedranges] else {

Sources/SourceKitLSP/Swift/CodeCompletionSession.swift

@@ -191,16 +191,15 @@ class CodeCompletionSession {
       throw ResponseError(code: .invalidRequest, message: "open must use the original snapshot")
     }
 
-    let req = SKDRequestDictionary(sourcekitd: sourcekitd)
-    req[keys.request] = sourcekitd.requests.codecomplete_open
-    req[keys.offset] = utf8StartOffset
-    req[keys.name] = uri.pseudoPath
-    req[keys.sourcefile] = uri.pseudoPath
-    req[keys.sourcetext] = snapshot.text
-    req[keys.codecomplete_options] = optionsDictionary(filterText: filterText, options: options)
-    if let compileCommand = compileCommand {
-      req[keys.compilerargs] = compileCommand.compilerArgs
-    }
+    let req = sourcekitd.dictionary([
+      keys.request: sourcekitd.requests.codecomplete_open,
+      keys.offset: utf8StartOffset,
+      keys.name: uri.pseudoPath,
+      keys.sourcefile: uri.pseudoPath,
+      keys.sourcetext: snapshot.text,
+      keys.codecomplete_options: optionsDictionary(filterText: filterText, options: options),
+      keys.compilerargs: compileCommand?.compilerArgs as [SKDValue]?,
+    ])
 
     let dict = try await sourcekitd.send(req, fileContents: snapshot.text)
     self.state = .open
@@ -229,11 +228,12 @@ class CodeCompletionSession {
     // FIXME: Assertion for prefix of snapshot matching what we started with.
 
     logger.info("Updating code completion session: \(self, privacy: .private) filter=\(filterText)")
-    let req = SKDRequestDictionary(sourcekitd: sourcekitd)
-    req[keys.request] = sourcekitd.requests.codecomplete_update
-    req[keys.offset] = utf8StartOffset
-    req[keys.name] = uri.pseudoPath
-    req[keys.codecomplete_options] = optionsDictionary(filterText: filterText, options: options)
+    let req = sourcekitd.dictionary([
+      keys.request: sourcekitd.requests.codecomplete_update,
+      keys.offset: utf8StartOffset,
+      keys.name: uri.pseudoPath,
+      keys.codecomplete_options: optionsDictionary(filterText: filterText, options: options),
+    ])
 
     let dict = try await sourcekitd.send(req, fileContents: snapshot.text)
     guard let completions: SKDResponseArray = dict[keys.results] else {
@@ -253,19 +253,18 @@ class CodeCompletionSession {
     filterText: String,
     options: SKCompletionOptions
   ) -> SKDRequestDictionary {
-    let dict = SKDRequestDictionary(sourcekitd: sourcekitd)
-    // Sorting and priority options.
-    dict[keys.codecomplete_hideunderscores] = 0
-    dict[keys.codecomplete_hidelowpriority] = 0
-    dict[keys.codecomplete_hidebyname] = 0
-    dict[keys.codecomplete_addinneroperators] = 0
-    dict[keys.codecomplete_callpatternheuristics] = 0
-    dict[keys.codecomplete_showtopnonliteralresults] = 0
-    // Filtering options.
-    dict[keys.codecomplete_filtertext] = filterText
-    if let maxResults = options.maxResults {
-      dict[keys.codecomplete_requestlimit] = maxResults
-    }
+    let dict = sourcekitd.dictionary([
+      // Sorting and priority options.
+      keys.codecomplete_hideunderscores: 0,
+      keys.codecomplete_hidelowpriority: 0,
+      keys.codecomplete_hidebyname: 0,
+      keys.codecomplete_addinneroperators: 0,
+      keys.codecomplete_callpatternheuristics: 0,
+      keys.codecomplete_showtopnonliteralresults: 0,
+      // Filtering options.
+      keys.codecomplete_filtertext: filterText,
+      keys.codecomplete_requestlimit: options.maxResults,
+    ])
     return dict
   }
 
@@ -275,10 +274,11 @@ class CodeCompletionSession {
       // Already closed, nothing to do.
       break
     case .open:
-      let req = SKDRequestDictionary(sourcekitd: sourcekitd)
-      req[keys.request] = sourcekitd.requests.codecomplete_close
-      req[keys.offset] = self.utf8StartOffset
-      req[keys.name] = self.snapshot.uri.pseudoPath
+      let req = sourcekitd.dictionary([
+        keys.request: sourcekitd.requests.codecomplete_close,
+        keys.offset: utf8StartOffset,
+        keys.name: snapshot.uri.pseudoPath,
+      ])
       logger.info("Closing code completion session: \(self, privacy: .private)")
       _ = try? await sourcekitd.send(req, fileContents: nil)
       self.state = .closed

Sources/SourceKitLSP/Swift/CursorInfo.swift

@@ -92,19 +92,14 @@ extension SwiftLanguageServer {
 
     let keys = self.keys
 
-    let skreq = SKDRequestDictionary(sourcekitd: sourcekitd)
-    skreq[keys.request] = requests.cursorinfo
-    skreq[keys.cancelOnSubsequentRequest] = 0
-    skreq[keys.offset] = offsetRange.lowerBound
-    if offsetRange.upperBound != offsetRange.lowerBound {
-      skreq[keys.length] = offsetRange.count
-    }
-    skreq[keys.sourcefile] = snapshot.uri.pseudoPath
-
-    // FIXME: SourceKit should probably cache this for us.
-    if let compileCommand = await self.buildSettings(for: uri) {
-      skreq[keys.compilerargs] = compileCommand.compilerArgs
-    }
+    let skreq = sourcekitd.dictionary([
+      keys.request: requests.cursorinfo,
+      keys.cancelOnSubsequentRequest: 0,
+      keys.offset: offsetRange.lowerBound,
+      keys.length: offsetRange.upperBound != offsetRange.lowerBound ? offsetRange.count : nil,
+      keys.sourcefile: snapshot.uri.pseudoPath,
+      keys.compilerargs: await self.buildSettings(for: uri)?.compilerArgs as [SKDValue]?,
+    ])
 
     appendAdditionalParameters?(skreq)
 

Sources/SourceKitLSP/Swift/OpenInterface.swift

@@ -70,17 +70,14 @@ extension SwiftLanguageServer {
     interfaceURI: DocumentURI
   ) async throws -> InterfaceInfo {
     let keys = self.keys
-    let skreq = SKDRequestDictionary(sourcekitd: sourcekitd)
-    skreq[keys.request] = requests.editor_open_interface
-    skreq[keys.modulename] = name
-    if request.groupNames.count > 0 {
-      skreq[keys.groupname] = request.groupNames
-    }
-    skreq[keys.name] = interfaceURI.pseudoPath
-    skreq[keys.synthesizedextensions] = 1
-    if let compileCommand = await self.buildSettings(for: uri) {
-      skreq[keys.compilerargs] = compileCommand.compilerArgs
-    }
+    let skreq = sourcekitd.dictionary([
+      keys.request: requests.editor_open_interface,
+      keys.modulename: name,
+      keys.groupname: request.groupNames.isEmpty ? nil : request.groupNames as [SKDValue],
+      keys.name: interfaceURI.pseudoPath,
+      keys.synthesizedextensions: 1,
+      keys.compilerargs: await self.buildSettings(for: uri)?.compilerArgs as [SKDValue]?,
+    ])
 
     let dict = try await self.sourcekitd.send(skreq, fileContents: nil)
     return InterfaceInfo(contents: dict[keys.sourcetext] ?? "")
@@ -97,11 +94,11 @@ extension SwiftLanguageServer {
         return InterfaceDetails(uri: uri, position: nil)
       }
       let keys = self.keys
-      let skreq = SKDRequestDictionary(sourcekitd: sourcekitd)
-
-      skreq[keys.request] = requests.find_usr
-      skreq[keys.sourcefile] = uri.pseudoPath
-      skreq[keys.usr] = symbol
+      let skreq = sourcekitd.dictionary([
+        keys.request: requests.find_usr,
+        keys.sourcefile: uri.pseudoPath,
+        keys.usr: symbol,
+      ])
 
       let dict = try await self.sourcekitd.send(skreq, fileContents: snapshot.text)
       if let offset: Int = dict[keys.offset],

Sources/SourceKitLSP/Swift/RelatedIdentifiers.swift

@@ -66,17 +66,14 @@ extension SwiftLanguageServer {
       throw ResponseError.unknown("invalid position \(position)")
     }
 
-    let skreq = SKDRequestDictionary(sourcekitd: self.sourcekitd)
-    skreq[keys.request] = self.requests.relatedidents
-    skreq[keys.cancelOnSubsequentRequest] = 0
-    skreq[keys.offset] = offset
-    skreq[keys.sourcefile] = snapshot.uri.pseudoPath
-    skreq[keys.includeNonEditableBaseNames] = includeNonEditableBaseNames ? 1 : 0
-
-    // FIXME: SourceKit should probably cache this for us.
-    if let compileCommand = await self.buildSettings(for: snapshot.uri) {
-      skreq[keys.compilerargs] = compileCommand.compilerArgs
-    }
+    let skreq = sourcekitd.dictionary([
+      keys.request: requests.relatedidents,
+      keys.cancelOnSubsequentRequest: 0,
+      keys.offset: offset,
+      keys.sourcefile: snapshot.uri.pseudoPath,
+      keys.includeNonEditableBaseNames: includeNonEditableBaseNames ? 1 : 0,
+      keys.compilerargs: await self.buildSettings(for: snapshot.uri)?.compilerArgs as [SKDValue]?,
+    ])
 
     let dict = try await self.sourcekitd.send(skreq, fileContents: snapshot.text)