Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/clang-tools-extra/include-fixer/find-all-symbols/HeaderMapCollector.cpp

@@ -0,0 +1,45 @@
+//===-- HeaderMapCoolector.h - find all symbols------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "HeaderMapCollector.h"
+#include "llvm/Support/Regex.h"
+
+namespace clang {
+namespace find_all_symbols {
+
+HeaderMapCollector::HeaderMapCollector(
+    const RegexHeaderMap *RegexHeaderMappingTable) {
+  assert(RegexHeaderMappingTable);
+  this->RegexHeaderMappingTable.reserve(RegexHeaderMappingTable->size());
+  for (const auto &Entry : *RegexHeaderMappingTable) {
+    this->RegexHeaderMappingTable.emplace_back(llvm::Regex(Entry.first),
+                                               Entry.second);
+  }
+}
+
+llvm::StringRef
+HeaderMapCollector::getMappedHeader(llvm::StringRef Header) const {
+  auto Iter = HeaderMappingTable.find(Header);
+  if (Iter != HeaderMappingTable.end())
+    return Iter->second;
+  // If there is no complete header name mapping for this header, check the
+  // regex header mapping.
+  for (auto &Entry : RegexHeaderMappingTable) {
+#ifndef NDEBUG
+    std::string Dummy;
+    assert(Entry.first.isValid(Dummy) && "Regex should never be invalid!");
+#endif
+    if (Entry.first.match(Header))
+      return Entry.second;
+  }
+  return Header;
+}
+
+} // namespace find_all_symbols
+} // namespace clang