From 32e14551a90e85000e41b3f0445d34d58a1431e4 Mon Sep 17 00:00:00 2001
From: Joel Klinghed <the_jk@spawned.biz>
Date: Wed, 10 Sep 2025 22:12:22 +0200
Subject: Add unicode general category lookup

Generate the lookup tables from UnicodeData.txt, do to that,
add gen_ugc, which uses csv, buffers, line, io and other modules
to do the job.
---
 src/csv.hh | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 src/csv.hh

(limited to 'src/csv.hh')

diff --git a/src/csv.hh b/src/csv.hh
new file mode 100644
index 0000000..8c47ceb
--- /dev/null
+++ b/src/csv.hh
@@ -0,0 +1,44 @@
+#ifndef CSV_HH
+#define CSV_HH
+
+#include "io.hh" // IWYU pragma: export
+#include "line.hh"
+
+#include <expected>
+#include <memory>
+#include <span>
+#include <string_view>
+
+namespace csv {
+
+// Note that this reader is very simple, no quotes or escapes.
+// Empty lines are ignored.
+class Reader {
+ public:
+  virtual ~Reader() = default;
+
+  // Returned span is only valid until next call to read.
+  // Returns empty span at end-of-file and only then.
+  [[nodiscard]]
+  virtual std::expected<std::span<std::string_view>, io::ReadError> read() = 0;
+
+  // Starts at zero. Returns next line.
+  // So, before first read it is zero, after first read it is one.
+  [[nodiscard]] virtual uint64_t number() const = 0;
+
+ protected:
+  Reader() = default;
+
+  Reader(Reader const&) = delete;
+  Reader& operator=(Reader const&) = delete;
+};
+
+[[nodiscard]] std::unique_ptr<Reader> open(std::unique_ptr<line::Reader> reader,
+                                           char separator = ',');
+
+[[nodiscard]] std::unique_ptr<Reader> open(std::unique_ptr<io::Reader> reader,
+                                           char separator = ',');
+
+}  // namespace csv
+
+#endif  // CSV_HH
-- 
cgit v1.3