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1 //===--- RefactoringCallbacks.h - Structural query framework ----*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 //  Provides callbacks to make common kinds of refactorings easy.
11 //
12 //  The general idea is to construct a matcher expression that describes a
13 //  subtree match on the AST and then replace the corresponding source code
14 //  either by some specific text or some other AST node.
15 //
16 //  Example:
17 //  int main(int argc, char **argv) {
18 //    ClangTool Tool(argc, argv);
19 //    MatchFinder Finder;
20 //    ReplaceStmtWithText Callback("integer", "42");
21 //    Finder.AddMatcher(id("integer", expression(integerLiteral())), Callback);
22 //    return Tool.run(newFrontendActionFactory(&Finder));
23 //  }
24 //
25 //  This will replace all integer literals with "42".
26 //
27 //===----------------------------------------------------------------------===//
28
29 #ifndef LLVM_CLANG_TOOLING_REFACTORING_CALLBACKS_H
30 #define LLVM_CLANG_TOOLING_REFACTORING_CALLBACKS_H
31
32 #include "clang/ASTMatchers/ASTMatchFinder.h"
33 #include "clang/Tooling/Refactoring.h"
34
35 namespace clang {
36 namespace tooling {
37
38 /// \brief Base class for RefactoringCallbacks.
39 ///
40 /// Collects \c tooling::Replacements while running.
41 class RefactoringCallback : public ast_matchers::MatchFinder::MatchCallback {
42 public:
43   RefactoringCallback();
44   Replacements &getReplacements();
45
46 protected:
47   Replacements Replace;
48 };
49
50 /// \brief Replace the text of the statement bound to \c FromId with the text in
51 /// \c ToText.
52 class ReplaceStmtWithText : public RefactoringCallback {
53 public:
54   ReplaceStmtWithText(StringRef FromId, StringRef ToText);
55   virtual void run(const ast_matchers::MatchFinder::MatchResult &Result);
56
57 private:
58   std::string FromId;
59   std::string ToText;
60 };
61
62 /// \brief Replace the text of the statement bound to \c FromId with the text of
63 /// the statement bound to \c ToId.
64 class ReplaceStmtWithStmt : public RefactoringCallback {
65 public:
66   ReplaceStmtWithStmt(StringRef FromId, StringRef ToId);
67   virtual void run(const ast_matchers::MatchFinder::MatchResult &Result);
68
69 private:
70   std::string FromId;
71   std::string ToId;
72 };
73
74 /// \brief Replace an if-statement bound to \c Id with the outdented text of its
75 /// body, choosing the consequent or the alternative based on whether
76 /// \c PickTrueBranch is true.
77 class ReplaceIfStmtWithItsBody : public RefactoringCallback {
78 public:
79   ReplaceIfStmtWithItsBody(StringRef Id, bool PickTrueBranch);
80   virtual void run(const ast_matchers::MatchFinder::MatchResult &Result);
81
82 private:
83   std::string Id;
84   const bool PickTrueBranch;
85 };
86
87 } // end namespace tooling
88 } // end namespace clang
89
90 #endif // LLVM_CLANG_TOOLING_REFACTORING_CALLBACKS_H