[willow]: initial frontend work, unit tests (#8)dev/stefan

1 files changed, 41 insertions, 0 deletions

diff --git a/willow/tools/willowc/lib/sourcemanager.cpp b/willow/tools/willowc/lib/sourcemanager.cpp
new file mode 100644
index 0000000..e2a8e72
--- /dev/null
+++ b/willow/tools/willowc/lib/sourcemanager.cpp
@@ -0,0 +1,41 @@
+#include <filesystem>
+
+#include <fstream>
+#include <sourcemanager.hpp>
+
+namespace willowc {
+
+std::optional<FileID> SourceManager::addFile(std::string_view _path) {
+  std::error_code ec;
+
+  std::filesystem::path uncanonical_path{_path};
+  auto path = std::filesystem::weakly_canonical(uncanonical_path, ec);
+  if (ec) {
+    return false;
+  }
+  std::string display_path = path.make_preferred();
+
+  if (!std::filesystem::exists(path, ec) || ec)
+    return std::nullopt;
+
+  if (!std::filesystem::is_regular_file(path, ec) || ec)
+    return std::nullopt;
+
+  std::size_t filesize = std::filesystem::file_size(path, ec);
+  if (ec)
+    return std::nullopt;
+
+  std::ifstream f{display_path, std::ios::binary};
+  if (!f)
+    return std::nullopt;
+
+  auto buf = std::make_unique<char[]>(filesize);
+  f.read(buf.get(), filesize);
+
+  const FileID id = file_table.size();
+  file_table.push_back(File{std::move(display_path), std::move(buf)});
+
+  return id;
+}
+
+} // namespace willowc