From 16379362c02a2472f00fac49cad62788547c9519 Mon Sep 17 00:00:00 2001
From: Dominick Allen <djallen@librehumanitas.org>
Date: Wed, 1 Jan 2025 17:41:17 -0600
Subject: Add CSV parsing, printing, fix buffered file reading.

---
 source/fud_csv.cpp | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 source/fud_csv.cpp

(limited to 'source/fud_csv.cpp')

diff --git a/source/fud_csv.cpp b/source/fud_csv.cpp
new file mode 100644
index 0000000..031fcbc
--- /dev/null
+++ b/source/fud_csv.cpp
@@ -0,0 +1,92 @@
+/*
+ * libfud
+ * Copyright 2025 Dominick Allen
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "fud_csv.hpp"
+
+namespace fud {
+
+FudStatus Csv::parseCsvFromFilename(
+    Csv& csv,
+    Option<TextBuffer&&> bufferOption,
+    StringView filename,
+    OpenFlags flags,
+    Option<int> dirFdOption)
+{
+    auto fileResult{RegularFile::open(filename, FileAccessMode::Read, flags, dirFdOption)};
+
+    if (fileResult.isError()) {
+        return fileResult.takeError();
+    }
+
+    if (bufferOption.hasValue()) {
+        auto bufferedFile{BufferedRegularFile::make(fileResult.takeOkay(), std::move(bufferOption.value()))};
+        return parseCsvFromBufferedFile(csv, bufferedFile);
+    }
+
+    auto unbufferedFile{fileResult.takeOkay()};
+    return parseCsvFromUnbufferedFile(csv, std::move(unbufferedFile));
+}
+
+enum class CsvTextState : uint8_t
+{
+    UnquotedField,
+    QuotedField,
+    Separator,
+    Newline,
+};
+
+FudStatus Csv::parseCsvFromBufferedFile(Csv& csv, BufferedRegularFile& file)
+{
+    auto lineEnding{newlineText(csv.newlineDelimiter)};
+    static_cast<void>(lineEnding);
+    DrainResult readResult{};
+    while (true) {
+        utf8 letter{};
+        auto drainResult = file.read(reinterpret_cast<std::byte*>(&letter), sizeof(letter), NullOpt);
+        readResult.status = drainResult.status;
+        readResult.bytesDrained += drainResult.bytesDrained;
+        // if (status
+        // REMOVE
+        break;
+    }
+
+    size_t rawSize = 0;
+
+    while (true) {
+        rawSize++;
+        // REMOVE
+        break;
+    }
+
+    auto reserveStatus = csv.buffer.reserve(rawSize);
+    if (reserveStatus != FudStatus::Success) {
+        return reserveStatus;
+    }
+
+    return FudStatus::NotImplemented;
+}
+
+FudStatus Csv::parseCsvFromUnbufferedFile(Csv& csv, RegularFile&& file)
+{
+    static_cast<void>(csv);
+    constexpr size_t BufferSize = 256;
+    SimpleStackAllocator<BufferSize> stackAllocator{};
+    auto bufferedFile{BufferedRegularFile::make(std::move(file), TextBuffer{stackAllocator})};
+    return parseCsvFromBufferedFile(csv, bufferedFile);
+}
+
+} // namespace fud
-- 
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