1 //===--- UseToStringCheck.cpp - clang-tidy---------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include "UseToStringCheck.h"
10
11 using namespace clang::ast_matchers;
12
13 namespace clang {
14 namespace tidy {
15 namespace boost {
16
17 namespace {
AST_MATCHER(Type,isStrictlyInteger)18 AST_MATCHER(Type, isStrictlyInteger) {
19 return Node.isIntegerType() && !Node.isAnyCharacterType() &&
20 !Node.isBooleanType();
21 }
22 } // namespace
23
registerMatchers(MatchFinder * Finder)24 void UseToStringCheck::registerMatchers(MatchFinder *Finder) {
25 Finder->addMatcher(
26 callExpr(
27 hasDeclaration(functionDecl(
28 returns(hasDeclaration(classTemplateSpecializationDecl(
29 hasName("std::basic_string"),
30 hasTemplateArgument(0,
31 templateArgument().bind("char_type"))))),
32 hasName("boost::lexical_cast"),
33 hasParameter(0, hasType(qualType(has(substTemplateTypeParmType(
34 isStrictlyInteger()))))))),
35 argumentCountIs(1), unless(isInTemplateInstantiation()))
36 .bind("to_string"),
37 this);
38 }
39
check(const MatchFinder::MatchResult & Result)40 void UseToStringCheck::check(const MatchFinder::MatchResult &Result) {
41 const auto *Call = Result.Nodes.getNodeAs<CallExpr>("to_string");
42 auto CharType =
43 Result.Nodes.getNodeAs<TemplateArgument>("char_type")->getAsType();
44
45 StringRef StringType;
46 if (CharType->isSpecificBuiltinType(BuiltinType::Char_S) ||
47 CharType->isSpecificBuiltinType(BuiltinType::Char_U))
48 StringType = "string";
49 else if (CharType->isSpecificBuiltinType(BuiltinType::WChar_S) ||
50 CharType->isSpecificBuiltinType(BuiltinType::WChar_U))
51 StringType = "wstring";
52 else
53 return;
54
55 auto Loc = Call->getBeginLoc();
56 auto Diag =
57 diag(Loc, "use std::to_%0 instead of boost::lexical_cast<std::%0>")
58 << StringType;
59
60 if (Loc.isMacroID())
61 return;
62
63 Diag << FixItHint::CreateReplacement(
64 CharSourceRange::getCharRange(Call->getBeginLoc(),
65 Call->getArg(0)->getBeginLoc()),
66 (llvm::Twine("std::to_") + StringType + "(").str());
67 }
68
69 } // namespace boost
70 } // namespace tidy
71 } // namespace clang
72