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//===--- Transformer.cpp - Transformer library implementation ---*- C++ -*-===//
//
// 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 "clang/Tooling/Transformer/Transformer.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/ASTMatchers/ASTMatchersInternal.h"
#include "clang/Basic/SourceLocation.h"
#include "clang/Tooling/Refactoring/AtomicChange.h"
#include "llvm/Support/Error.h"
#include <map>
#include <utility>
#include <vector>
namespace clang {
namespace tooling {
using ::clang::ast_matchers::MatchFinder;
namespace detail {
void TransformerImpl::onMatch(
const ast_matchers::MatchFinder::MatchResult &Result) {
if (Result.Context->getDiagnostics().hasErrorOccurred())
return;
onMatchImpl(Result);
}
llvm::Expected<llvm::SmallVector<AtomicChange, 1>>
TransformerImpl::convertToAtomicChanges(
const llvm::SmallVectorImpl<transformer::Edit> &Edits,
const MatchFinder::MatchResult &Result) {
// Group the transformations, by file, into AtomicChanges, each anchored by
// the location of the first change in that file.
std::map<FileID, AtomicChange> ChangesByFileID;
for (const auto &T : Edits) {
auto ID = Result.SourceManager->getFileID(T.Range.getBegin());
auto Iter = ChangesByFileID
.emplace(ID, AtomicChange(*Result.SourceManager,
T.Range.getBegin(), T.Metadata))
.first;
auto &AC = Iter->second;
switch (T.Kind) {
case transformer::EditKind::Range:
if (auto Err =
AC.replace(*Result.SourceManager, T.Range, T.Replacement)) {
return std::move(Err);
}
break;
case transformer::EditKind::AddInclude:
AC.addHeader(T.Replacement);
break;
}
}
llvm::SmallVector<AtomicChange, 1> Changes;
Changes.reserve(ChangesByFileID.size());
for (auto &IDChangePair : ChangesByFileID)
Changes.push_back(std::move(IDChangePair.second));
return Changes;
}
} // namespace detail
void Transformer::registerMatchers(MatchFinder *MatchFinder) {
for (auto &Matcher : Impl->buildMatchers())
MatchFinder->addDynamicMatcher(Matcher, this);
}
void Transformer::run(const MatchFinder::MatchResult &Result) {
if (Result.Context->getDiagnostics().hasErrorOccurred())
return;
Impl->onMatch(Result);
}
} // namespace tooling
} // namespace clang
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