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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"
namespace clang {
namespace tidy {
namespace utils {
using tooling::RewriteRule;
TransformerClangTidyCheck::TransformerClangTidyCheck(tooling::RewriteRule R,
StringRef Name,
ClangTidyContext *Context)
: ClangTidyCheck(Name, Context), Rule(std::move(R)) {
for (const auto &Case : Rule.Cases) {
assert(Case.Explanation != nullptr &&
"clang-tidy checks must have an explanation by default;"
" explicitly provide an empty explanation if none is desired");
}
}
void TransformerClangTidyCheck::registerMatchers(
ast_matchers::MatchFinder *Finder) {
Finder->addDynamicMatcher(tooling::detail::buildMatcher(Rule), this);
}
void TransformerClangTidyCheck::check(
const ast_matchers::MatchFinder::MatchResult &Result) {
if (Result.Context->getDiagnostics().hasErrorOccurred())
return;
// Verify the existence and validity of the AST node that roots this rule.
const ast_matchers::BoundNodes::IDToNodeMap &NodesMap = Result.Nodes.getMap();
auto Root = NodesMap.find(RewriteRule::RootID);
assert(Root != NodesMap.end() && "Transformation failed: missing root node.");
SourceLocation RootLoc = Result.SourceManager->getExpansionLoc(
Root->second.getSourceRange().getBegin());
assert(RootLoc.isValid() && "Invalid location for Root node of match.");
RewriteRule::Case Case = tooling::detail::findSelectedCase(Result, Rule);
Expected<SmallVector<tooling::detail::Transformation, 1>> Transformations =
tooling::detail::translateEdits(Result, Case.Edits);
if (!Transformations) {
llvm::errs() << "Rewrite failed: "
<< llvm::toString(Transformations.takeError()) << "\n";
return;
}
// No rewrite applied, but no error encountered either.
if (Transformations->empty())
return;
Expected<std::string> Explanation = Case.Explanation(Result);
if (!Explanation) {
llvm::errs() << "Error in explanation: "
<< llvm::toString(Explanation.takeError()) << "\n";
return;
}
DiagnosticBuilder Diag = diag(RootLoc, *Explanation);
for (const auto &T : *Transformations) {
Diag << FixItHint::CreateReplacement(T.Range, T.Replacement);
}
}
} // namespace utils
} // namespace tidy
} // namespace clang
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