1 //===--- RefactoringCallbacks.cpp - Structural query framework ------------===//
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 //
11 //===----------------------------------------------------------------------===//
12 #include "clang/Lex/Lexer.h"
13 #include "clang/Tooling/RefactoringCallbacks.h"
14 
15 namespace clang {
16 namespace tooling {
17 
18 RefactoringCallback::RefactoringCallback() {}
19 tooling::Replacements &RefactoringCallback::getReplacements() {
20   return Replace;
21 }
22 
23 static Replacement replaceStmtWithText(SourceManager &Sources,
24                                        const Stmt &From,
25                                        StringRef Text) {
26   return tooling::Replacement(Sources, CharSourceRange::getTokenRange(
27       From.getSourceRange()), Text);
28 }
29 static Replacement replaceStmtWithStmt(SourceManager &Sources,
30                                        const Stmt &From,
31                                        const Stmt &To) {
32   return replaceStmtWithText(Sources, From, Lexer::getSourceText(
33       CharSourceRange::getTokenRange(To.getSourceRange()),
34       Sources, LangOptions()));
35 }
36 
37 ReplaceStmtWithText::ReplaceStmtWithText(StringRef FromId, StringRef ToText)
38     : FromId(FromId), ToText(ToText) {}
39 
40 void ReplaceStmtWithText::run(
41     const ast_matchers::MatchFinder::MatchResult &Result) {
42   if (const Stmt *FromMatch = Result.Nodes.getStmtAs<Stmt>(FromId)) {
43     auto Err = Replace.add(tooling::Replacement(
44         *Result.SourceManager,
45         CharSourceRange::getTokenRange(FromMatch->getSourceRange()), ToText));
46     // FIXME: better error handling. For now, just print error message in the
47     // release version.
48     if (Err)
49       llvm::errs() << llvm::toString(std::move(Err)) << "\n";
50     assert(!Err);
51   }
52 }
53 
54 ReplaceStmtWithStmt::ReplaceStmtWithStmt(StringRef FromId, StringRef ToId)
55     : FromId(FromId), ToId(ToId) {}
56 
57 void ReplaceStmtWithStmt::run(
58     const ast_matchers::MatchFinder::MatchResult &Result) {
59   const Stmt *FromMatch = Result.Nodes.getStmtAs<Stmt>(FromId);
60   const Stmt *ToMatch = Result.Nodes.getStmtAs<Stmt>(ToId);
61   if (FromMatch && ToMatch) {
62     auto Err = Replace.add(
63         replaceStmtWithStmt(*Result.SourceManager, *FromMatch, *ToMatch));
64     // FIXME: better error handling. For now, just print error message in the
65     // release version.
66     if (Err)
67       llvm::errs() << llvm::toString(std::move(Err)) << "\n";
68     assert(!Err);
69   }
70 }
71 
72 ReplaceIfStmtWithItsBody::ReplaceIfStmtWithItsBody(StringRef Id,
73                                                    bool PickTrueBranch)
74     : Id(Id), PickTrueBranch(PickTrueBranch) {}
75 
76 void ReplaceIfStmtWithItsBody::run(
77     const ast_matchers::MatchFinder::MatchResult &Result) {
78   if (const IfStmt *Node = Result.Nodes.getStmtAs<IfStmt>(Id)) {
79     const Stmt *Body = PickTrueBranch ? Node->getThen() : Node->getElse();
80     if (Body) {
81       auto Err =
82           Replace.add(replaceStmtWithStmt(*Result.SourceManager, *Node, *Body));
83       // FIXME: better error handling. For now, just print error message in the
84       // release version.
85       if (Err)
86         llvm::errs() << llvm::toString(std::move(Err)) << "\n";
87       assert(!Err);
88     } else if (!PickTrueBranch) {
89       // If we want to use the 'else'-branch, but it doesn't exist, delete
90       // the whole 'if'.
91       auto Err =
92           Replace.add(replaceStmtWithText(*Result.SourceManager, *Node, ""));
93       // FIXME: better error handling. For now, just print error message in the
94       // release version.
95       if (Err)
96         llvm::errs() << llvm::toString(std::move(Err)) << "\n";
97       assert(!Err);
98     }
99   }
100 }
101 
102 } // end namespace tooling
103 } // end namespace clang
104