ilya-biryukov updated this revision to Diff 182317.
ilya-biryukov added a comment.
- Update to reflect changes in parent revision
Repository:
rCTE Clang Tools Extra
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D56611/new/
https://reviews.llvm.org/D56611
Files:
clangd/refactor/tweaks/CMakeLists.txt
clangd/refactor/tweaks/SwapIfBranches.cpp
clangd/refactor/tweaks/SwapIfBranches.h
Index: clangd/refactor/tweaks/SwapIfBranches.h
===================================================================
--- /dev/null
+++ clangd/refactor/tweaks/SwapIfBranches.h
@@ -0,0 +1,41 @@
+//===--- SwapIfBrances.h -----------------------------------------*- C++-*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+// Swaps the 'then' and 'else' branch of the if statement.
+// Before:
+// if (foo) { return 10; } else { continue; }
+// After:
+// if (foo) { continue; } else { return 10; }
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANGD_REFACTOR_TWEAKS_SWAPIFBRANCHES_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_REFACTOR_TWEAKS_SWAPIFBRANCHES_H
+
+#include "refactor/Tweak.h"
+#include "clang/Tooling/Core/Replacement.h"
+#include "llvm/ADT/StringRef.h"
+
+namespace clang {
+namespace clangd {
+
+class SwapIfBranches : public Tweak {
+public:
+ TweakID id() const override { return llvm::StringLiteral("swap-if-branches"); }
+
+ bool prepare(const Selection &Inputs) override;
+ Expected<tooling::Replacements> apply(const Selection &Inputs) override;
+ std::string title() const override;
+
+private:
+ tooling::Replacements Result;
+};
+
+} // namespace clangd
+} // namespace clang
+
+#endif
Index: clangd/refactor/tweaks/SwapIfBranches.cpp
===================================================================
--- /dev/null
+++ clangd/refactor/tweaks/SwapIfBranches.cpp
@@ -0,0 +1,102 @@
+//===--- SwapIfBranches.cpp --------------------------------------*- C++-*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+#include "SwapIfBranches.h"
+#include "ClangdUnit.h"
+#include "Logger.h"
+#include "SourceCode.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/RecursiveASTVisitor.h"
+#include "clang/AST/Stmt.h"
+#include "clang/Basic/LangOptions.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/SourceManager.h"
+#include "clang/Lex/Lexer.h"
+#include "clang/Tooling/Core/Replacement.h"
+#include "llvm/ADT/None.h"
+#include "llvm/ADT/Optional.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Casting.h"
+#include "llvm/Support/Error.h"
+
+namespace clang {
+namespace clangd {
+
+REGISTER_TWEAK(SwapIfBranches);
+
+namespace {
+class FindIfUnderCursor : public RecursiveASTVisitor<FindIfUnderCursor> {
+public:
+ FindIfUnderCursor(ASTContext &Ctx, SourceLocation CursorLoc, IfStmt *&Result)
+ : Ctx(Ctx), CursorLoc(CursorLoc), Result(Result) {}
+
+ bool VisitIfStmt(IfStmt *If) {
+ auto R = toHalfOpenFileRange(Ctx.getSourceManager(), Ctx.getLangOpts(),
+ SourceRange(If->getIfLoc()));
+ if (!R)
+ return true;
+ if (!halfOpenRangeContains(Ctx.getSourceManager(), *R, CursorLoc))
+ return true;
+ Result = If;
+ return false;
+ }
+
+private:
+ ASTContext &Ctx;
+ SourceLocation CursorLoc;
+ IfStmt *&Result;
+};
+} // namespace
+
+bool SwapIfBranches::prepare(const Selection &Inputs) {
+
+ auto &Ctx = Inputs.AST.getASTContext();
+ auto &SrcMgr = Ctx.getSourceManager();
+ IfStmt *If = nullptr;
+ FindIfUnderCursor(Ctx, Inputs.Cursor, If).TraverseAST(Ctx);
+ if (!If)
+ return false;
+
+ // avoid dealing with single-statement brances, they require careful handling
+ // to avoid changing semantics of the code (i.e. dangling else).
+ if (!llvm::dyn_cast_or_null<CompoundStmt>(If->getThen()) ||
+ !llvm::dyn_cast_or_null<CompoundStmt>(If->getElse()))
+ return false;
+
+ auto ThenRng = toHalfOpenFileRange(SrcMgr, Ctx.getLangOpts(),
+ If->getThen()->getSourceRange());
+ if (!ThenRng)
+ return false;
+ auto ElseRng = toHalfOpenFileRange(SrcMgr, Ctx.getLangOpts(),
+ If->getElse()->getSourceRange());
+ if (!ElseRng)
+ return false;
+
+ llvm::StringRef ThenCode = toSourceCode(SrcMgr, *ThenRng);
+ llvm::StringRef ElseCode = toSourceCode(SrcMgr, *ElseRng);
+
+ if (auto Err = Result.add(tooling::Replacement(SrcMgr, ThenRng->getBegin(),
+ ThenCode.size(), ElseCode))) {
+ llvm::consumeError(std::move(Err));
+ return false;
+ }
+ if (auto Err = Result.add(tooling::Replacement(SrcMgr, ElseRng->getBegin(),
+ ElseCode.size(), ThenCode))) {
+ llvm::consumeError(std::move(Err));
+ return false;
+ }
+ return true;
+}
+
+Expected<tooling::Replacements> SwapIfBranches::apply(const Selection &Inputs) {
+ return Result;
+}
+
+std::string SwapIfBranches::title() const { return "Swap if branches"; }
+} // namespace clangd
+} // namespace clang
Index: clangd/refactor/tweaks/CMakeLists.txt
===================================================================
--- clangd/refactor/tweaks/CMakeLists.txt
+++ clangd/refactor/tweaks/CMakeLists.txt
@@ -9,4 +9,5 @@
# clangd/tool/CMakeLists.txt for an example.
add_clang_library(clangDaemonTweaks OBJECT
QualifyName.cpp
+ SwapIfBranches.cpp
)
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