DurationSubtractionCheck.cpp
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//===--- DurationSubtractionCheck.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 "DurationSubtractionCheck.h"
#include "DurationRewriter.h"
#include "clang/AST/ASTContext.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Tooling/FixIt.h"
using namespace clang::ast_matchers;
namespace clang {
namespace tidy {
namespace abseil {
void DurationSubtractionCheck::registerMatchers(MatchFinder *Finder) {
Finder->addMatcher(
binaryOperator(
hasOperatorName("-"),
hasLHS(callExpr(callee(functionDecl(DurationConversionFunction())
.bind("function_decl")),
hasArgument(0, expr().bind("lhs_arg")))))
.bind("binop"),
this);
}
void DurationSubtractionCheck::check(const MatchFinder::MatchResult &Result) {
const auto *Binop = Result.Nodes.getNodeAs<BinaryOperator>("binop");
const auto *FuncDecl = Result.Nodes.getNodeAs<FunctionDecl>("function_decl");
// Don't try to replace things inside of macro definitions.
if (Binop->getExprLoc().isMacroID() || Binop->getExprLoc().isInvalid())
return;
llvm::Optional<DurationScale> Scale =
getScaleForDurationInverse(FuncDecl->getName());
if (!Scale)
return;
std::string RhsReplacement =
rewriteExprFromNumberToDuration(Result, *Scale, Binop->getRHS());
const Expr *LhsArg = Result.Nodes.getNodeAs<Expr>("lhs_arg");
diag(Binop->getBeginLoc(), "perform subtraction in the duration domain")
<< FixItHint::CreateReplacement(
Binop->getSourceRange(),
(llvm::Twine("absl::") + FuncDecl->getName() + "(" +
tooling::fixit::getText(*LhsArg, *Result.Context) + " - " +
RhsReplacement + ")")
.str());
}
} // namespace abseil
} // namespace tidy
} // namespace clang