Initial commit

core-library/io/file-stream.cpp

@@ -0,0 +1,69 @@
+#include "file-stream.h"
+
+#include "core-library/io/io-helper.h"
+
+#include <system_error>
+
+core::file_stream::~file_stream()
+{
+	close();
+}
+
+core::file_stream::file_stream(file_stream&& other) noexcept
+: m_file_handle(std::exchange(other.m_file_handle, nullptr))
+{
+}
+
+core::file_stream& core::file_stream::operator=(file_stream&& other)
+{
+	if (this != &other)
+	{
+		core::close_file(m_file_handle);
+		m_file_handle = std::exchange(other.m_file_handle, nullptr);
+	}
+
+	return *this;
+}
+
+core::file_stream core::file_stream::open_for_reading(const std::filesystem::path& file_path)
+{
+	file_stream stream{};
+	stream.m_file_handle = core::open_file(file_path.string().c_str(), "rb");
+
+	return stream;
+}
+
+std::string core::file_stream::file_contents_as_string(const std::filesystem::path& file_path)
+{
+	file_stream stream = open_for_reading(file_path);
+	return stream.read_all_as_string();
+}
+
+std::string core::file_stream::read_all_as_string()
+{
+	if (!m_file_handle)
+		return {};
+
+	core::seek_file_to_end(m_file_handle);
+	const std::size_t file_size = static_cast<std::size_t>(core::get_file_offset(m_file_handle));
+	core::seek_file_to_beginning(m_file_handle);
+
+	if (file_size == 0)
+		return {};
+
+	std::string result(file_size, '\0');
+	core::read_from_file(&result[0], 1, file_size, m_file_handle);
+
+	return result;
+}
+
+void core::file_stream::close()
+{
+	if (m_file_handle)
+	{
+		if (int result = std::fclose(m_file_handle); result != 0)
+			throw std::system_error(std::error_code{result, std::system_category()});
+
+		m_file_handle = nullptr;
+	}
+}

core-library/io/file-stream.h

@@ -0,0 +1,31 @@
+#pragma once
+#include <concepts>
+#include <cstdio>
+#include <filesystem>
+#include <string>
+#include <type_traits>
+
+namespace core {
+
+class file_stream
+{
+public:
+	file_stream(const file_stream&)            = delete;
+	file_stream& operator=(const file_stream&) = delete;
+	file_stream(file_stream&&) noexcept;
+	file_stream& operator=(file_stream&&);
+	~file_stream();
+
+	static file_stream open_for_reading(const std::filesystem::path& file_path);
+	static std::string file_contents_as_string(const std::filesystem::path& file_path);
+
+	std::string read_all_as_string();
+	void        close();
+
+private:
+	file_stream() = default;
+
+	FILE* m_file_handle{};
+};
+
+}

core-library/io/io-helper.cpp

@@ -0,0 +1,72 @@
+#include "io-helper.h"
+
+#include <system_error>
+
+std::FILE* core::open_file(const char* file_path, const char* mode)
+{
+	std::FILE* file = std::fopen(file_path, mode);
+	if (!file)
+		throw std::system_error(errno, std::system_category());
+
+	return file;
+}
+
+void core::seek_file_to_beginning(std::FILE* file, long offset)
+{
+	const int result = std::fseek(file, offset, SEEK_SET);
+	if (result != 0)
+		throw std::system_error(errno, std::system_category());
+}
+
+void core::seek_file_relatively(std::FILE* file, long offset)
+{
+	const int result = std::fseek(file, offset, SEEK_CUR);
+	if (result != 0)
+		throw std::system_error(errno, std::system_category());
+}
+
+void core::seek_file_to_end(std::FILE* file, long offset)
+{
+	const int result = std::fseek(file, offset, SEEK_END);
+	if (result != 0)
+		throw std::system_error(errno, std::system_category());
+}
+
+long core::get_file_offset(std::FILE* file)
+{
+	const long offset = std::ftell(file);
+	if (offset < 0)
+		throw std::system_error(errno, std::system_category());
+
+	return offset;
+}
+
+std::size_t core::read_from_file(void* buffer, std::size_t size, std::size_t count, std::FILE* file)
+{
+	const std::size_t objects_read = std::fread(buffer, size, count, file);
+	if (objects_read < count)
+	{
+		if (std::feof(file))
+			throw std::runtime_error("Failed to read from file: End-of-file reached.");
+		else
+			throw std::runtime_error("Failed to read from file: Unknown error.");
+	}
+
+	return objects_read;
+}
+
+std::size_t core::write_to_file(const void* buffer, std::size_t size, std::size_t count, std::FILE* file)
+{
+	const std::size_t objects_written = std::fwrite(buffer, size, count, file);
+	if (objects_written < count)
+		throw std::runtime_error("Failed to write to file.");
+
+	return objects_written;
+}
+
+void core::close_file(std::FILE* file)
+{
+	int result = std::fclose(file);
+	if (result != 0)
+		throw std::runtime_error("Failed to close file.");
+}

core-library/io/io-helper.h

@@ -0,0 +1,16 @@
+#pragma once
+#include <cstdio>
+#include <string_view>
+
+namespace core {
+
+extern std::FILE*  open_file(const char* file_path, const char* mode);
+extern void        seek_file_to_beginning(std::FILE* file, long offset = 0);
+extern void        seek_file_relatively(std::FILE* file, long offset);
+extern void        seek_file_to_end(std::FILE* file, long offset = 0);
+extern long        get_file_offset(std::FILE* file);
+extern std::size_t read_from_file(void* buffer, std::size_t size, std::size_t count, std::FILE* file);
+extern std::size_t write_to_file(const void* buffer, std::size_t size, std::size_t count, std::FILE* file);
+extern void        close_file(std::FILE* file);
+
+}

core-library/premake5.lua

@@ -0,0 +1,17 @@
+project "cpp-core-library"
+do
+  kind "StaticLib"
+  location "%{_MAIN_SCRIPT_DIR}/.build"
+  includedirs {"%{_MAIN_SCRIPT_DIR}"}
+  files {
+    "**.cpp",
+    "**.h",
+  }
+
+  filter "toolset:msc*"
+  do
+    defines {"_CRT_SECURE_NO_WARNINGS"}
+  end
+
+  filter ""
+end

core-library/traits/function-traits.h

@@ -0,0 +1,61 @@
+#pragma once
+#include <concepts>
+
+namespace core {
+
+template<typename T>
+concept callable = requires { &T::operator(); };
+
+template<typename T>
+struct function_traits
+{
+	using return_type         = void;
+	using first_argument_type = void;
+};
+
+template<typename T>
+	requires callable<T>
+struct function_traits<T>
+{
+	using return_type         = typename function_traits<decltype(&T::operator())>::return_type;
+	using first_argument_type = typename function_traits<decltype(&T::operator())>::first_argument_type;
+};
+
+template<typename Ret, typename Arg0, typename... Args>
+struct function_traits<Ret(Arg0, Args...)>
+{
+	using return_type         = typename Ret;
+	using first_argument_type = typename Arg0;
+};
+
+template<typename Ret, typename Arg0, typename... Args>
+struct function_traits<Ret (*)(Arg0, Args...)>
+{
+	using return_type         = typename Ret;
+	using first_argument_type = typename Arg0;
+};
+
+template<typename Ret, typename Class, typename Arg0, typename... Args>
+struct function_traits<Ret (Class::*)(Arg0, Args...)>
+{
+	using return_type         = typename Ret;
+	using first_argument_type = typename Arg0;
+};
+
+template<typename Ret, typename Class, typename Arg0, typename... Args>
+struct function_traits<Ret (Class::*)(Arg0, Args...) const>
+{
+	using return_type         = typename Ret;
+	using first_argument_type = typename Arg0;
+};
+
+template<typename T>
+using return_type_t = typename function_traits<T>::return_type;
+
+template<typename T>
+using first_argument_type_t = typename function_traits<T>::first_argument_type;
+
+template<typename T, typename Arg>
+concept callable_with_converted_argument = requires(T&& callable, Arg&& arg) { callable(typename traits::first_argument_type_t<T>{arg}); };
+
+}

core-library/views/command-line-args-view.h

@@ -0,0 +1,95 @@
+#pragma once
+#include <ranges>
+#include <span>
+#include <string_view>
+
+namespace core {
+
+class command_line_argument
+{
+public:
+	constexpr command_line_argument(char* arg, std::span<char*> modifiers)
+	: m_arg_view{arg}
+	, m_modifiers{modifiers}
+	{
+	}
+
+	template<typename F>
+		requires std::invocable<F>
+	void with(std::string_view arg_to_match_view, F&& function) const
+	{
+		if (arg_to_match_view == m_arg_view)
+			std::invoke(std::forward<F>(function));
+	}
+
+private:
+	std::string_view m_arg_view;
+	std::span<char*> m_modifiers;
+};
+
+class command_line_args_view : public std::ranges::view_interface<command_line_args_view>
+{
+public:
+	constexpr command_line_args_view() = default;
+
+	constexpr command_line_args_view(int argc, char* argv[])
+	: m_argc{--argc}
+	, m_application_path{argv++[0]}
+	, m_argv{argv}
+	{
+	}
+
+	class iterator
+	{
+	public:
+		constexpr iterator(int argc, char** argv, int index)
+		: m_argv{argv}
+		, m_argc{argc}
+		, m_index{index}
+		{
+		}
+
+		constexpr iterator& operator++()
+		{
+			++m_index;
+
+			while (m_index < m_argc)
+			{
+				const std::string_view arg_view{m_argv[m_index]};
+				if (arg_view.starts_with("--"))
+					m_modifier_start_index = m_index++;
+			}
+
+			return *this;
+		}
+
+		constexpr command_line_argument operator*() const
+		{
+			if (m_modifier_start_index != -1)
+				return command_line_argument{m_argv[m_index], std::span<char*>(&m_argv[m_modifier_start_index], &m_argv[m_index])};
+			else
+				return command_line_argument{m_argv[m_index], {}};
+		}
+
+		constexpr bool operator!=(const iterator& other) const { return m_argv != other.m_argv || m_index != other.m_index; }
+
+	private:
+		char** m_argv;
+		int    m_argc;
+		int    m_index;
+		int    m_modifier_start_index{-1};
+	};
+
+	constexpr auto&& appliation_path() const { return m_application_path; }
+
+	constexpr iterator    begin() const { return iterator{m_argc, m_argv, 0}; }
+	constexpr iterator    end() const { return iterator{m_argc, m_argv, m_argc}; }
+	constexpr std::size_t size() const { return static_cast<std::size_t>(m_argc); }
+
+private:
+	int    m_argc{};
+	char*  m_application_path{};
+	char** m_argv{};
+};
+
+}

core-library/views/trim-elements-view.h

@@ -0,0 +1,55 @@
+#pragma once
+#include "core-library/views/trim-view.h"
+
+namespace core {
+
+template<std::ranges::forward_range Range>
+	requires requires(Range&& range) {
+		(void)range.empty();
+		(void)trim_view{(*std::begin(range))};
+	}
+class trim_elements_view : public std::ranges::view_interface<trim_elements_view<Range>>
+{
+public:
+	constexpr trim_elements_view(Range range)
+	: m_range(std::move(range))
+	{
+	}
+
+	class iterator
+	{
+	public:
+		using base_t = std::ranges::iterator_t<Range>;
+
+		constexpr iterator(base_t base, base_t end)
+		: m_base{base}
+		, m_end{end}
+		{
+		}
+
+		constexpr bool operator!=(iterator other) const { return m_base != other.m_base; }
+		constexpr auto operator*() const { return trim_view{*m_base}; }
+
+		constexpr iterator& operator++()
+		{
+			// Skip empty elements
+			while (++m_base != m_end && std::ranges::empty(**this)) {}
+
+			return *this;
+		}
+
+	private:
+		base_t m_base;
+		base_t m_end;
+	};
+
+	constexpr auto begin() { return iterator{std::begin(m_range), std::end(m_range)}; }
+	constexpr auto end() { return iterator{std::end(m_range), std::end(m_range)}; }
+
+private:
+	Range m_range{};
+};
+
+constexpr view_closure<trim_elements_view> trim_elements{};
+
+}

core-library/views/trim-view.h

@@ -0,0 +1,53 @@
+#pragma once
+#include "core-library/views/view-closure.h"
+
+#include <ranges>
+
+namespace core {
+
+template<std::ranges::forward_range Range>
+	requires requires(Range&& range) {
+		*std::begin(range) == ' '; // Comparable with char literals.
+	}
+class trim_view : public std::ranges::view_interface<trim_view<Range>>
+{
+public:
+	constexpr explicit trim_view(Range range)
+	: m_range(std::move(range))
+	{
+	}
+
+	static constexpr bool is_space(auto&& c)
+	{
+		return c == ' ' || c == '\t' || c == '\r' || c == '\n' || c == '\0';
+	}
+
+	constexpr auto begin()
+	{
+		auto it = std::begin(m_range);
+		while (it != std::end(m_range) && is_space(*it))
+			++it;
+
+		return it;
+	}
+
+	constexpr auto end()
+	{
+		auto nonspace_end = std::end(m_range);
+
+		for (auto it = std::begin(m_range); it != std::end(m_range);)
+		{
+			if (!is_space(*it++))
+				nonspace_end = it;
+		}
+
+		return nonspace_end;
+	}
+
+private:
+	Range m_range{};
+};
+
+constexpr view_closure<trim_view> trim{};
+
+}

core-library/views/view-closure.h

@@ -0,0 +1,18 @@
+#pragma once
+#include <ranges>
+
+namespace core {
+
+template<template<typename> typename ViewTemplate>
+class view_closure : public std::ranges::range_adaptor_closure<view_closure<ViewTemplate>>
+{
+public:
+	template<std::ranges::viewable_range Range>
+	constexpr auto operator()(Range&& range) const
+		requires requires { ViewTemplate<std::views::all_t<Range>>{std::forward<Range>(range)}; }
+	{
+		return ViewTemplate<std::views::all_t<Range>>{std::forward<Range>(range)};
+	}
+};
+
+}