Add initial string_view implementation

CMakeLists.txt

@@ -3,8 +3,8 @@ cmake_minimum_required(VERSION 3.5)
 project(mtl LANGUAGES CXX C ASM)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
-set(TARGET_SRC_FILES src/memcpy.s src/string.cpp src/fixed.s)
+set(TARGET_SRC_FILES src/memcpy.s src/string.cpp src/string_view.cpp src/fixed.s)
-set(TARGET_PUB_INCLUDE_FILES include/mtl/utility.hpp include/mtl/string.hpp include/mtl/fsm.hpp)
+set(TARGET_PUB_INCLUDE_FILES include/mtl/utility.hpp include/mtl/string.hpp include/mtl/string_view.hpp include/mtl/fsm.hpp)
 
 add_library(${PROJECT_NAME} STATIC ${TARGET_SRC_FILES} ${TARGET_PUB_INCLUDE_FILES})
 

include/mtl/string_view.hpp

@@ -0,0 +1,117 @@
+#pragma once
+
+#include <cstddef>
+#include <cstring>
+#include <string> // std::char_traits
+#include <iterator>
+
+namespace mtl {
+
+class istring;
+
+constexpr size_t strlen(const char* str) {
+	return *str != '\0' ? strlen(str + 1) + 1 : 0;
+}
+
+class string_view {
+	const char* m_str;
+	size_t m_size;
+
+	friend class istring;
+
+public:
+	typedef const char* iterator;
+	typedef std::reverse_iterator<iterator> reverse_iterator;
+
+	static constexpr size_t npos = -1;
+
+	constexpr string_view(const char* str) : m_str(str), m_size(mtl::strlen(str)) {}
+	constexpr string_view(const char* str, size_t size) : m_str(str), m_size(size) {}
+	string_view(const istring& str);
+	string_view(const istring& str, size_t size);
+
+	constexpr const char& at(size_t i) const { return m_str[i]; }
+	constexpr const char& operator[](size_t i) const { return m_str[i]; }
+
+	constexpr const char& front() const { return m_str[0]; }
+	constexpr const char& back() const { return m_str[m_size - 1]; }
+
+	constexpr const char* data() const { return m_str; }
+	constexpr const char* c_str() const { return m_str; }
+
+	iterator begin() const { return m_str; }
+	iterator cbegin() const { return m_str; }
+
+	iterator end() const { return m_str + m_size; }
+	iterator cend() const { return m_str + m_size; }
+
+	reverse_iterator rbegin() const { return reverse_iterator(m_str + m_size); }
+	reverse_iterator crbegin() const { return reverse_iterator(m_str + m_size); }
+
+	reverse_iterator rend() const { return reverse_iterator(m_str); }
+	reverse_iterator crend() const { return reverse_iterator(m_str); }
+
+	constexpr bool empty() const { return m_size == 0; }
+
+	constexpr size_t size() const { return m_size; }
+	constexpr size_t length() const { return m_size; }
+
+	size_t copy(char* dest, size_t count, size_t pos = 0) const;
+
+	// Search
+	
+	size_t find(const istring& str, size_t pos = 0) const;
+	size_t find(const string_view& str, size_t pos = 0) const;
+	size_t find(char ch, size_t pos = 0) const;
+
+	size_t rfind(const istring& str, size_t pos = npos) const;
+	size_t rfind(const string_view&, size_t pos = npos) const;
+	size_t rfind(char ch, size_t pos = npos) const;
+
+	size_t find_first_of(const istring& str, size_t pos = 0) const;
+	size_t find_first_of(const string_view& str, size_t pos = 0) const;
+	size_t find_first_of(char ch, size_t pos = 0) const;
+
+	size_t find_first_not_of(const istring& str, size_t pos = 0) const;
+	size_t find_first_not_of(const string_view& str, size_t pos = 0) const;
+	size_t find_first_not_of(char ch, size_t pos = 0) const;
+
+	size_t find_last_of(const istring& str, size_t pos = npos) const;
+	size_t find_last_of(const string_view& str, size_t pos = npos) const;
+	size_t find_last_of(char ch, size_t pos = npos) const;
+
+	size_t find_last_not_of(const istring& str, size_t pos = npos) const;
+	size_t find_last_not_of(const string_view& str, size_t pos = npos) const;
+	size_t find_last_not_of(char ch, size_t pos = npos) const;
+
+	// Comparison
+	
+	int32_t compare(const istring& str) const;
+	int32_t compare(size_t pos, size_t count, const istring& str) const;
+	int32_t compare(size_t pos1, size_t count1, istring& str, size_t pos2, size_t count2 = npos) const;
+	int32_t compare(const string_view& str) const;
+	int32_t compare(size_t pos, size_t count, const string_view& str) const;
+	int32_t compare(size_t pos1, size_t count1, const string_view& str, size_t pos2, size_t count2 = npos) const;
+
+	friend bool operator==(const istring& lhs, const istring& rhs);
+	friend bool operator!=(const istring& lhs, const istring& rhs);
+	friend bool operator<(const istring& lhs, const istring& rhs);
+	friend bool operator<=(const istring& lhs, const istring& rhs);
+	friend bool operator>(const istring& lhs, const istring& rhs);
+	friend bool operator>=(const istring& lhs, const istring& rhs);
+
+	friend bool operator==(const istring& lhs, const string_view& rhs);
+	friend bool operator==(const string_view& lhs, const istring& rhs);
+	friend bool operator!=(const istring& lhs, const string_view& rhs);
+	friend bool operator!=(const string_view& lhs, const istring& rhs);
+	friend bool operator<(const istring& lhs, const string_view& rhs);
+	friend bool operator<(const string_view& lhs, const istring& rhs);
+	friend bool operator<=(const istring& lhs, const string_view& rhs);
+	friend bool operator<=(const string_view& lhs, const istring& rhs);
+	friend bool operator>(const istring& lhs, const string_view& rhs);
+	friend bool operator>(const string_view& lhs, const istring& rhs);
+	friend bool operator>=(const istring& lhs, const string_view& rhs);
+	friend bool operator>=(const string_view& lhs, const istring& rhs);
+};
+
+} // namespace mtl

src/string_view.cpp

@@ -0,0 +1,12 @@
+#include "mtl/string_view.hpp"
+
+#include "mtl/string.hpp"
+
+namespace mtl {
+
+string_view::string_view(const istring& str)
+	: m_str(str.c_str()), m_size(str.size()) {}
+string_view::string_view(const istring& str, size_t size)
+	: m_str(str.c_str()), m_size(size) {}
+
+} // namespace mtl