TransformerClangTidyCheck.cpp
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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
// 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)
: ClangTidyCheck(Name, Context), Rule(MakeRule(getLangOpts(), Options)),
Inserter(
Options.getLocalOrGlobal("IncludeStyle", IncludeSorter::IS_LLVM)) {
if (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(RewriteRule R,
StringRef Name,
ClangTidyContext *Context)
: ClangTidyCheck(Name, Context), Rule(std::move(R)),
Inserter(
Options.getLocalOrGlobal("IncludeStyle", IncludeSorter::IS_LLVM)) {
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");
}
void TransformerClangTidyCheck::registerPPCallbacks(
const SourceManager &SM, Preprocessor *PP, Preprocessor *ModuleExpanderPP) {
Inserter.registerPreprocessor(PP);
}
void TransformerClangTidyCheck::registerMatchers(
ast_matchers::MatchFinder *Finder) {
if (Rule)
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;
assert(Rule && "check() should not fire if Rule is None");
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: {
StringRef FileName = T.Replacement;
bool IsAngled = FileName.startswith("<") && FileName.endswith(">");
Diag << Inserter.createMainFileIncludeInsertion(
IsAngled ? FileName.substr(1, FileName.size() - 2) : FileName,
IsAngled);
break;
}
}
}
void TransformerClangTidyCheck::storeOptions(
ClangTidyOptions::OptionMap &Opts) {
Options.store(Opts, "IncludeStyle", Inserter.getStyle());
}
} // namespace utils
} // namespace tidy
} // namespace clang