clang-tools-extra/clang-tidy/boost/UseToStringCheck.cpp

   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::tidy::boost {
  14
  15 namespace {
  16 AST_MATCHER(Type, isStrictlyInteger) {
  17   return Node.isIntegerType() && !Node.isAnyCharacterType() &&
  18          !Node.isBooleanType();
  19 }
  20 } // namespace
  21
  22 void UseToStringCheck::registerMatchers(MatchFinder *Finder) {
  23   Finder->addMatcher(
  24       callExpr(
  25           hasDeclaration(functionDecl(
  26               returns(hasDeclaration(classTemplateSpecializationDecl(
  27                   hasName("std::basic_string"),
  28                   hasTemplateArgument(0,
  29                                       templateArgument().bind("char_type"))))),
  30               hasName("boost::lexical_cast"),
  31               hasParameter(0, hasType(qualType(has(substTemplateTypeParmType(
  32                                   isStrictlyInteger()))))))),
  33           argumentCountIs(1), unless(isInTemplateInstantiation()))
  34           .bind("to_string"),
  35       this);
  36 }
  37
  38 void UseToStringCheck::check(const MatchFinder::MatchResult &Result) {
  39   const auto *Call = Result.Nodes.getNodeAs<CallExpr>("to_string");
  40   auto CharType =
  41       Result.Nodes.getNodeAs<TemplateArgument>("char_type")->getAsType();
  42
  43   StringRef StringType;
  44   if (CharType->isSpecificBuiltinType(BuiltinType::Char_S) ||
  45       CharType->isSpecificBuiltinType(BuiltinType::Char_U))
  46     StringType = "string";
  47   else if (CharType->isSpecificBuiltinType(BuiltinType::WChar_S) ||
  48            CharType->isSpecificBuiltinType(BuiltinType::WChar_U))
  49     StringType = "wstring";
  50   else
  51     return;
  52
  53   auto Loc = Call->getBeginLoc();
  54   auto Diag =
  55       diag(Loc, "use std::to_%0 instead of boost::lexical_cast<std::%0>")
  56       << StringType;
  57
  58   if (Loc.isMacroID())
  59     return;
  60
  61   Diag << FixItHint::CreateReplacement(
  62       CharSourceRange::getCharRange(Call->getBeginLoc(),
  63                                     Call->getArg(0)->getBeginLoc()),
  64       (llvm::Twine("std::to_") + StringType + "(").str());
  65 }
  66
  67 } // namespace clang::tidy::boost