Start C++ library

1 files changed, 86 insertions, 0 deletions

diff --git a/cpp/pom.hpp b/cpp/pom.hpp
new file mode 100644
index 0000000..e3c66d4
--- /dev/null
+++ b/cpp/pom.hpp
@@ -0,0 +1,86 @@
+#ifndef POM_HPP_
+#define POM_HPP_
+
+#include <exception>
+#include <cstdint>
+#include <string_view>
+#include <memory>
+#include <optional>
+
+namespace pom {
+
+class Error: public std::exception {
+public:
+	~Error();
+	std::string_view file() const noexcept;
+	uint64_t line() const noexcept;
+	std::string_view message() const noexcept;
+	const Error *next() const noexcept;
+	std::string_view to_string() noexcept;
+	/// You should only call this on the first error in an error list.
+	/// (This can't be enforced with constness because it needs to
+	/// override `std::exception::what`.)
+	virtual const char *what() const noexcept override;
+private:
+	friend class Configuration;
+	friend class Parser;
+	Error() = delete;
+	Error(void *C_error);
+	Error(const void *C_error);
+	void *C;
+	bool m_is_original;
+	std::unique_ptr<const Error> m_next;
+};
+
+class Allocator {
+public:
+	virtual ~Allocator() = 0;
+	virtual void *calloc(size_t, size_t) = 0;
+	virtual void *realloc(void *, size_t) = 0;
+	virtual void free(void *) = 0;
+};
+
+class Settings {
+public:
+	Settings();
+	/// Set allocator.
+	void set_allocator(std::shared_ptr<Allocator> allocator) {
+		m_allocator = allocator;
+	}
+	void set_error_language(std::string_view lang);
+private:
+	void to_C(void *C) const;
+	friend class Configuration;
+	char m_error_lang[16] = {};
+	std::shared_ptr<Allocator> m_allocator;
+	uint32_t version = 1; // future-proofing
+};
+
+class Reader {
+public:
+	virtual size_t read(char *buf, size_t count) = 0;
+};
+
+class Configuration {
+public:
+	Configuration();
+	~Configuration();
+	std::optional<std::string_view> get(std::string_view key) const;
+	std::string_view get_or_default(std::string_view key, std::string_view dflt) const;
+	Configuration section(std::string_view name) const;
+	void merge(const Configuration &other);
+	static Configuration load(std::string_view filename, Reader &source, const Settings *settings = nullptr);
+	static Configuration load(std::string_view filename, std::istream &stream, const Settings *settings = nullptr);
+	static Configuration load(std::string_view path, const Settings *settings = nullptr);
+	static Configuration load(std::string_view filename, std::string_view string, const Settings *settings = nullptr);
+private:
+	explicit Configuration(void *c);
+	void *C;
+};
+
+
+
+
+} // namespace pom
+
+#endif // POM_HPP_