[Migrator] Separate AST Pass implementations

include/swift/Migrator/ASTMigratorPass.h

@@ -0,0 +1,66 @@
+//===--- ASTMigratorPass.h --------------------------------------*- C++ -*-===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2017 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
+//
+//===----------------------------------------------------------------------===//
+//
+// A base class for a syntactic migrator pass that uses the temporary
+// swift::migrator::EditorAdapter infrastructure.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SWIFT_MIGRATOR_ASTMIGRATORPASS_H
+#define SWIFT_MIGRATOR_ASTMIGRATORPASS_H
+
+#include "swift/AST/ASTContext.h"
+#include "swift/Migrator/EditorAdapter.h"
+
+namespace swift {
+class SourceManager;
+struct MigratorOptions;
+
+namespace migrator {
+class ASTMigratorPass {
+protected:
+  EditorAdapter &Editor;
+  SourceFile *SF;
+  const MigratorOptions &Opts;
+  const StringRef Filename;
+  const unsigned BufferID;
+  SourceManager &SM;
+
+  ASTMigratorPass(EditorAdapter &Editor, SourceFile *SF,
+                  const MigratorOptions &Opts)
+    : Editor(Editor), SF(SF), Opts(Opts), Filename(SF->getFilename()),
+      BufferID(SF->getBufferID().getValue()),
+      SM(SF->getASTContext().SourceMgr) {}
+};
+
+/// Run a general pass to migrate code based on SDK differences in the previous
+/// release.
+void runAPIDiffMigratorPass(EditorAdapter &Editor,
+                            SourceFile *SF,
+                            const MigratorOptions &Opts);
+
+/// Run a pass to fix up new tuple interpretation in SE-0110.
+void runTupleSplatMigratorPass(EditorAdapter &Editor,
+                               SourceFile *SF,
+                               const MigratorOptions &Opts);
+
+/// Run a pass to prepend 'Swift.' to `type(of:)` expressions if they will
+/// be shadowed in Swift 4, as these are now resolved by normal overload
+/// resolution.
+void runTypeOfMigratorPass(EditorAdapter &Editor,
+                           SourceFile *SF,
+                           const MigratorOptions &Opts);
+
+} // end namespace migrator
+} // end namespace swift
+
+#endif // SWIFT_MIGRATOR_ASTMIGRATORPASS_H