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//===--- Tweak.cpp -----------------------------------------------*- 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 "Tweak.h"
#include "Logger.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/Registry.h"
#include <functional>
#include <memory>
LLVM_INSTANTIATE_REGISTRY(llvm::Registry<clang::clangd::Tweak>)
namespace clang {
namespace clangd {
/// A handy typedef to save some typing.
typedef llvm::Registry<Tweak> TweakRegistry;
namespace {
/// Asserts invariants on TweakRegistry. No-op with assertion disabled.
void validateRegistry() {
#ifndef NDEBUG
llvm::StringSet<> Seen;
for (const auto &E : TweakRegistry::entries()) {
// REGISTER_TWEAK ensures E.getName() is equal to the tweak class name.
// We check that id() matches it.
assert(E.instantiate()->id() == E.getName() &&
"id should be equal to class name");
assert(Seen.try_emplace(E.getName()).second && "duplicate check id");
}
#endif
}
} // namespace
Tweak::Selection::Selection(ParsedAST &AST, unsigned RangeBegin,
unsigned RangeEnd)
: AST(AST), SelectionBegin(RangeBegin), SelectionEnd(RangeEnd),
ASTSelection(AST.getASTContext(), RangeBegin, RangeEnd) {
auto &SM = AST.getSourceManager();
Code = SM.getBufferData(SM.getMainFileID());
Cursor = SM.getComposedLoc(SM.getMainFileID(), RangeBegin);
}
std::vector<std::unique_ptr<Tweak>>
prepareTweaks(const Tweak::Selection &S,
llvm::function_ref<bool(const Tweak &)> Filter) {
validateRegistry();
std::vector<std::unique_ptr<Tweak>> Available;
for (const auto &E : TweakRegistry::entries()) {
std::unique_ptr<Tweak> T = E.instantiate();
if (!Filter(*T) || !T->prepare(S))
continue;
Available.push_back(std::move(T));
}
// Ensure deterministic order of the results.
llvm::sort(Available,
[](const std::unique_ptr<Tweak> &L,
const std::unique_ptr<Tweak> &R) { return L->id() < R->id(); });
return Available;
}
llvm::Expected<std::unique_ptr<Tweak>> prepareTweak(StringRef ID,
const Tweak::Selection &S) {
auto It = llvm::find_if(
TweakRegistry::entries(),
[ID](const TweakRegistry::entry &E) { return E.getName() == ID; });
if (It == TweakRegistry::end())
return llvm::createStringError(llvm::inconvertibleErrorCode(),
"id of the tweak is invalid");
std::unique_ptr<Tweak> T = It->instantiate();
if (!T->prepare(S))
return llvm::createStringError(llvm::inconvertibleErrorCode(),
"failed to prepare() a check");
return std::move(T);
}
} // namespace clangd
} // namespace clang
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