first pass at splitting writer logic

src/headerwriter.cpp

@@ -0,0 +1,93 @@
+/* headerwriter.cpp - Copyright (C) 2015-2024 a dinosaur (zlib, see COPYING.txt) */
+
+#include "headerwriter.hpp"
+
+
+template <typename T> static constexpr std::string_view DatType();
+template <> constexpr std::string_view DatType<uint8_t>() { return "unsigned char"; }
+template <> constexpr std::string_view DatType<uint16_t>() { return "unsigned short"; }
+template <> constexpr std::string_view DatType<uint32_t>() { return "unsigned int"; }
+
+void HeaderWriter::WriteSize(int width, int height)
+{
+	stream << std::endl;
+	WriteDefine(name + "Width", width);
+	WriteDefine(name + "Height", height);
+}
+
+void HeaderWriter::WriteCharacterMap(const std::span<uint16_t> charData)
+{
+	stream << std::endl;
+	WriteDefine(name + "TilesLen", charData.size() * 2);
+	WriteSymbol(name + "Tiles", DatType<uint16_t>(), charData.size());
+}
+
+void HeaderWriter::WriteCollision(const std::span<uint8_t> collisionData)
+{
+	stream << std::endl;
+	WriteDefine(name + "CollisionLen", collisionData.size());
+	WriteSymbol(name + "Collision", DatType<uint8_t>(), collisionData.size());
+}
+
+void HeaderWriter::WriteObjects(const std::span<uint32_t> objData)
+{
+	stream << std::endl;
+	WriteDefine(name + "ObjCount", objData.size() / 3);
+	WriteDefine(name + "ObjdatLen", objData.size() * sizeof(int));
+	WriteSymbol(name + "Objdat", DatType<uint32_t>(), objData.size());
+}
+
+
+static std::string GuardName(const std::string_view name)
+{
+	auto upper = std::string(name);
+	for (auto& c: upper)
+		c = static_cast<char>(toupper(c));
+	return "TMX2GBA_" + upper;
+}
+
+
+void HeaderWriter::WriteGuardStart()
+{
+	const std::string guard = GuardName(name);
+	stream << "#ifndef " << guard << std::endl;
+	stream << "#define " << guard << std::endl;
+}
+
+void HeaderWriter::WriteGuardEnd()
+{
+	const std::string guard = GuardName(name);
+	stream << std::endl << "#endif//" << guard << std::endl;
+}
+
+
+HeaderWriter::~HeaderWriter()
+{
+	if (stream.is_open())
+	{
+		WriteGuardEnd();
+		stream.close();
+	}
+}
+
+
+bool HeaderWriter::Open(const std::string_view path, const std::string_view name)
+{
+	this->name = name;
+	stream.open(path);
+	if (!stream.is_open())
+		return false;
+
+	WriteGuardStart();
+	return true;
+}
+
+void HeaderWriter::WriteDefine(const std::string_view name, const std::string_view value)
+{
+	stream << "#define " << name << " " << value << std::endl;
+}
+
+void HeaderWriter::WriteSymbol(const std::string_view name, const std::string_view type, std::size_t count)
+{
+	stream << "extern const " << type << " " << name << "[" << count << "];" << std::endl;
+}