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//===--- HeaderSourceSwitch.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 "HeaderSourceSwitch.h"
namespace clang {
namespace clangd {
llvm::Optional<Path> getCorrespondingHeaderOrSource(
const Path &OriginalFile,
llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS) {
llvm::StringRef SourceExtensions[] = {".cpp", ".c", ".cc", ".cxx",
".c++", ".m", ".mm"};
llvm::StringRef HeaderExtensions[] = {".h", ".hh", ".hpp", ".hxx", ".inc"};
llvm::StringRef PathExt = llvm::sys::path::extension(OriginalFile);
// Lookup in a list of known extensions.
auto SourceIter =
llvm::find_if(SourceExtensions, [&PathExt](PathRef SourceExt) {
return SourceExt.equals_lower(PathExt);
});
bool IsSource = SourceIter != std::end(SourceExtensions);
auto HeaderIter =
llvm::find_if(HeaderExtensions, [&PathExt](PathRef HeaderExt) {
return HeaderExt.equals_lower(PathExt);
});
bool IsHeader = HeaderIter != std::end(HeaderExtensions);
// We can only switch between the known extensions.
if (!IsSource && !IsHeader)
return None;
// Array to lookup extensions for the switch. An opposite of where original
// extension was found.
llvm::ArrayRef<llvm::StringRef> NewExts;
if (IsSource)
NewExts = HeaderExtensions;
else
NewExts = SourceExtensions;
// Storage for the new path.
llvm::SmallString<128> NewPath = llvm::StringRef(OriginalFile);
// Loop through switched extension candidates.
for (llvm::StringRef NewExt : NewExts) {
llvm::sys::path::replace_extension(NewPath, NewExt);
if (VFS->exists(NewPath))
return NewPath.str().str(); // First str() to convert from SmallString to
// StringRef, second to convert from StringRef
// to std::string
// Also check NewExt in upper-case, just in case.
llvm::sys::path::replace_extension(NewPath, NewExt.upper());
if (VFS->exists(NewPath))
return NewPath.str().str();
}
return None;
}
} // namespace clangd
} // namespace clang
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