UnaryStaticAssertCheck.cpp

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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
 
#include "UnaryStaticAssertCheck.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
 
using namespace clang::ast_matchers;
 
namespace clang::tidy::modernize {
 
void UnaryStaticAssertCheck::registerMatchers(MatchFinder *Finder) {
  Finder->addMatcher(staticAssertDecl().bind("static_assert"), this);
}
 
void UnaryStaticAssertCheck::check(const MatchFinder::MatchResult &Result) {
  const auto *MatchedDecl =
      Result.Nodes.getNodeAs<StaticAssertDecl>("static_assert");
  const auto *AssertMessage =
      dyn_cast_if_present<StringLiteral>(MatchedDecl->getMessage());
 
  SourceLocation Loc = MatchedDecl->getLocation();
 
  if (!AssertMessage || AssertMessage->getLength() ||
      AssertMessage->getBeginLoc().isMacroID() || Loc.isMacroID())
    return;
 
  diag(Loc,
       "use unary 'static_assert' when the string literal is an empty string")
      << FixItHint::CreateRemoval(AssertMessage->getSourceRange());
}
 
} // namespace clang::tidy::modernize