Revert "[sourcekitd] Rename module SwiftSourceKit to SwiftLang. (#14497)"

This reverts commit 43435af.

Author: DougGregor

test/SwiftSyntax/DeserializeFile.swift

@@ -6,7 +6,7 @@
 import StdlibUnittest
 import Foundation
 import SwiftSyntax
-import SwiftLang
+import SwiftSourceKit
 
 func getInput(_ file: String) -> URL {
   var result = URL(fileURLWithPath: #file)
@@ -20,7 +20,7 @@ var DecodeTests = TestSuite("DecodeSyntax")
 
 DecodeTests.test("Basic") {
   expectDoesNotThrow({
-    let content = try SwiftLang.parse(getInput("visitor.swift"))
+    let content = try SourceFileSyntax.encodeSourceFileSyntax(getInput("visitor.swift"))
     let source = try String(contentsOf: getInput("visitor.swift"))
     let parsed = try SourceFileSyntax.decodeSourceFileSyntax(content)
     expectEqual("\(parsed)", source)

test/SwiftSyntax/ParseFile.swift

@@ -6,7 +6,7 @@
 import Foundation
 import StdlibUnittest
 import SwiftSyntax
-import SwiftLang
+import SwiftSourceKit
 
 var ParseFile = TestSuite("ParseFile")
 
@@ -32,7 +32,7 @@ ParseFile.test("ParseSingleFile") {
   expectDoesNotThrow({
     let currentFileContents = try String(contentsOf: currentFile)
     let parsed = try SourceFileSyntax.decodeSourceFileSyntax(try
-      SwiftLang.parse(currentFile))
+      SourceKitdService.encodeSourceFileSyntax(currentFile))
     expectEqual("\(parsed)", currentFileContents)
   })
 }

test/SwiftSyntax/VisitorTest.swift

@@ -6,7 +6,7 @@
 import StdlibUnittest
 import Foundation
 import SwiftSyntax
-import SwiftLang
+import SwiftSourceKit
 
 func getInput(_ file: String) -> URL {
   var result = URL(fileURLWithPath: #file)
@@ -28,7 +28,7 @@ VisitorTests.test("Basic") {
   }
   expectDoesNotThrow({
     let parsed = try SourceFileSyntax.decodeSourceFileSyntax(try
-      SwiftLang.parse(getInput("visitor.swift")))
+      SourceKitdService.encodeSourceFileSyntax(getInput("visitor.swift")))
     let counter = FuncCounter()
     let hashBefore = parsed.hashValue
     counter.visit(parsed)

tools/SwiftSourceKitClient/CMakeLists.txt

@@ -2,8 +2,7 @@ set(EXTRA_COMPILE_FLAGS "-F" "${SWIFT_LIBRARY_OUTPUT_INTDIR}")
 set(EXTRA_LINKER_FLAGS "-Xlinker" "-rpath" "-Xlinker" "${SWIFT_LIBRARY_OUTPUT_INTDIR}"
     "-Xlinker" "-F" "-Xlinker" "${SWIFT_LIBRARY_OUTPUT_INTDIR}")
 
-add_swift_library(swiftSwiftLang SHARED
-  SwiftLang.swift
+add_swift_library(swiftSwiftSourceKit SHARED
   SourceKitdClient.swift
   SourceKitdRequest.swift
   SourceKitdResponse.swift

tools/SwiftSourceKitClient/SourceKitdClient.swift

@@ -27,3 +27,22 @@ public class SourceKitdService {
     return SourceKitdResponse(resp: sourcekitd_send_request_sync(request.rawRequest))
   }
 }
+
+extension SourceKitdService {
+  /// Parses the Swift file at the provided URL into a `Syntax` tree in Json
+  /// serialization format by querying SourceKitd service.
+  /// - Parameter url: The URL you wish to parse.
+  /// - Returns: The syntax tree in Json format string.
+  public static func encodeSourceFileSyntax(_ url: URL) throws -> String {
+    let Service = SourceKitdService()
+    let Request = SourceKitdRequest(uid: .source_request_editor_open)
+    let Path = url.path
+    Request.addParameter(.key_sourcefile, value: Path)
+    Request.addParameter(.key_name, value: Path)
+    Request.addParameter(.key_enable_syntax_tree, value: 1)
+
+    // FIXME: SourceKitd error handling.
+    let Resp = Service.sendSyn(request: Request)
+    return Resp.value.getString(.key_serialized_syntax_tree)
+  }
+}