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//===---------- TransformerClangTidyCheck.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 "TransformerClangTidyCheck.h"
#include "clang/Lex/Preprocessor.h"
#include "llvm/ADT/STLExtras.h"
namespace clang {
namespace tidy {
namespace utils {
using transformer::RewriteRule;
#ifndef NDEBUG
static bool hasExplanation(const RewriteRule::Case &C) {
return C.Explanation != nullptr;
}
#endif
static void verifyRule(const RewriteRule &Rule) {
assert(llvm::all_of(Rule.Cases, hasExplanation) &&
"clang-tidy checks must have an explanation by default;"
" explicitly provide an empty explanation if none is desired");
}
TransformerClangTidyCheck::TransformerClangTidyCheck(StringRef Name,
ClangTidyContext *Context)
: ClangTidyCheck(Name, Context),
Inserter(
Options.getLocalOrGlobal("IncludeStyle", IncludeSorter::IS_LLVM)) {}
// This constructor cannot dispatch to the simpler one (below), because, in
// order to get meaningful results from `getLangOpts` and `Options`, we need the
// `ClangTidyCheck()` constructor to have been called. If we were to dispatch,
// we would be accessing `getLangOpts` and `Options` before the underlying
// `ClangTidyCheck` instance was properly initialized.
TransformerClangTidyCheck::TransformerClangTidyCheck(
std::function<Optional<RewriteRule>(const LangOptions &,
const OptionsView &)>
MakeRule,
StringRef Name, ClangTidyContext *Context)
: TransformerClangTidyCheck(Name, Context) {
if (Optional<RewriteRule> R = MakeRule(getLangOpts(), Options))
setRule(std::move(*R));
}
TransformerClangTidyCheck::TransformerClangTidyCheck(RewriteRule R,
StringRef Name,
ClangTidyContext *Context)
: TransformerClangTidyCheck(Name, Context) {
setRule(std::move(R));
}
void TransformerClangTidyCheck::setRule(transformer::RewriteRule R) {
verifyRule(R);
Rule = std::move(R);
}
void TransformerClangTidyCheck::registerPPCallbacks(
const SourceManager &SM, Preprocessor *PP, Preprocessor *ModuleExpanderPP) {
Inserter.registerPreprocessor(PP);
}
void TransformerClangTidyCheck::registerMatchers(
ast_matchers::MatchFinder *Finder) {
if (!Rule.Cases.empty())
for (auto &Matcher : transformer::detail::buildMatchers(Rule))
Finder->addDynamicMatcher(Matcher, this);
}
void TransformerClangTidyCheck::check(
const ast_matchers::MatchFinder::MatchResult &Result) {
if (Result.Context->getDiagnostics().hasErrorOccurred())
return;
RewriteRule::Case Case = transformer::detail::findSelectedCase(Result, Rule);
Expected<SmallVector<transformer::Edit, 1>> Edits = Case.Edits(Result);
if (!Edits) {
llvm::errs() << "Rewrite failed: " << llvm::toString(Edits.takeError())
<< "\n";
return;
}
// No rewrite applied, but no error encountered either.
if (Edits->empty())
return;
Expected<std::string> Explanation = Case.Explanation->eval(Result);
if (!Explanation) {
llvm::errs() << "Error in explanation: "
<< llvm::toString(Explanation.takeError()) << "\n";
return;
}
// Associate the diagnostic with the location of the first change.
DiagnosticBuilder Diag = diag((*Edits)[0].Range.getBegin(), *Explanation);
for (const auto &T : *Edits)
switch (T.Kind) {
case transformer::EditKind::Range:
Diag << FixItHint::CreateReplacement(T.Range, T.Replacement);
break;
case transformer::EditKind::AddInclude:
Diag << Inserter.createIncludeInsertion(
Result.SourceManager->getFileID(T.Range.getBegin()), T.Replacement);
break;
}
}
void TransformerClangTidyCheck::storeOptions(
ClangTidyOptions::OptionMap &Opts) {
Options.store(Opts, "IncludeStyle", Inserter.getStyle());
}
} // namespace utils
} // namespace tidy
} // namespace clang
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