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//===--- MisplacedArrayIndexCheck.cpp - clang-tidy-------------------------===//
//
// 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 "MisplacedArrayIndexCheck.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Lex/Lexer.h"
#include "clang/Tooling/FixIt.h"
using namespace clang::ast_matchers;
namespace clang::tidy::readability {
void MisplacedArrayIndexCheck::registerMatchers(MatchFinder *Finder) {
Finder->addMatcher(
traverse(TK_AsIs, arraySubscriptExpr(hasLHS(hasType(isInteger())),
hasRHS(hasType(isAnyPointer())))
.bind("expr")),
this);
}
void MisplacedArrayIndexCheck::check(const MatchFinder::MatchResult &Result) {
const auto *ArraySubscriptE =
Result.Nodes.getNodeAs<ArraySubscriptExpr>("expr");
auto Diag = diag(ArraySubscriptE->getBeginLoc(), "confusing array subscript "
"expression, usually the "
"index is inside the []");
// Only try to fixit when LHS and RHS can be swapped directly without changing
// the logic.
const Expr *RHSE = ArraySubscriptE->getRHS()->IgnoreParenImpCasts();
if (!isa<StringLiteral>(RHSE) && !isa<DeclRefExpr>(RHSE) &&
!isa<MemberExpr>(RHSE))
return;
const StringRef LText = tooling::fixit::getText(
ArraySubscriptE->getLHS()->getSourceRange(), *Result.Context);
const StringRef RText = tooling::fixit::getText(
ArraySubscriptE->getRHS()->getSourceRange(), *Result.Context);
Diag << FixItHint::CreateReplacement(
ArraySubscriptE->getLHS()->getSourceRange(), RText);
Diag << FixItHint::CreateReplacement(
ArraySubscriptE->getRHS()->getSourceRange(), LText);
}
} // namespace clang::tidy::readability
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