Added path views for abs and rel paths

2024-07-10 11:52:47 +02:00
parent 51cf1887cd
commit 2195ccfc28
15 changed files with 4637 additions and 957 deletions
@@ -0,0 +1,277 @@
+#pragma once
+
+#include "tl/detail/prologue.h"
+#include <cstddef>
+#include "tl/path_system.h"
+#include "tl/rel_path_view.h"
+#include "tl/detail/path_view_base.h"
+#include "tl/plain_crash.h"
+#include "tl/format.h"
+
+namespace tl
+{
+
+template<typename PathSystems> class rel_path;
+template<typename PathSystems> class rel_path_view;
+template<typename PathSystems> struct path_view_key_less;
+
+//////////////////////////////////////////////////////////////////////////
+
+template<typename PathSystems>
+class rel_path_view : public detail::path_system::path_view_base
+{
+	template<typename T> friend class rel_path_view;
+
+public:
+	using rel_path_view_type = rel_path_view<PathSystems>;
+
+	rel_path_view() noexcept;
+	rel_path_view(tl::span<const string> elements) noexcept;
+
+	rel_path_view(const rel_path_view& other) noexcept;
+
+	// operators
+	rel_path_view& operator=(const rel_path_view& other) noexcept;
+
+	bool operator==(const rel_path_view& other) const noexcept;
+	bool operator!=(const rel_path_view& other) const noexcept;
+	auto operator<=>(const rel_path_view& other) const noexcept;
+
+	void				clear() noexcept;
+
+	template<typename FormatSystem>
+	string				str() const noexcept;
+
+	template<typename FormatSystem>
+	eastl::string		eastl_str() const noexcept;
+
+	template<typename FormatSystem>
+	std::string			std_str() const noexcept;
+
+	rel_path_view<PathSystems>	subpath(size_t idx, int count = 0) const noexcept;
+	rel_path_view		parent() const noexcept;
+	rel_path_view		parent(size_t levels) const noexcept;
+	bool				is_prefix_of(const rel_path_view& path) const noexcept;
+
+	template<typename other_rel_path>
+	other_rel_path		cast_to() const noexcept;
+
+private:
+	friend class rel_path<PathSystems>;
+};
+
+//////////////////////////////////////////////////////////////////////////
+
+}
+
+//////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////
+
+namespace tl
+{
+//////////////////////////////////////////////////////////////////////////
+
+template <typename PathSystems>
+rel_path_view<PathSystems>::rel_path_view() noexcept
+{
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+template <typename PathSystems>
+rel_path_view<PathSystems>::rel_path_view(tl::span<const string> elements) noexcept
+	: path_view_base(elements)
+{
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+template <typename PathSystems>
+rel_path_view<PathSystems>::rel_path_view(const rel_path_view& other) noexcept
+	: path_view_base(other)
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template <typename PathSystems>
+rel_path_view<PathSystems>& rel_path_view<PathSystems>::operator=(const rel_path_view& other) noexcept
+{
+	m_elements = other.m_elements;
+	m_hash = other.m_hash;
+	return *this;
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+template <typename PathSystems>
+bool rel_path_view<PathSystems>::operator==(const rel_path_view& other) const noexcept
+{
+	return (!this->m_hash || !other.m_hash || this->m_hash == other.m_hash) &&
+		this->m_elements == other.m_elements;
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+template <typename PathSystems>
+bool rel_path_view<PathSystems>::operator!=(const rel_path_view& other) const noexcept
+{
+	return !(*this == other);
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+template <typename PathSystems>
+void rel_path_view<PathSystems>::clear() noexcept
+{
+	m_elements = {};
+	m_hash = 0;
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+template<class PathSystems>
+template<typename FormatSystem>
+string rel_path_view<PathSystems>::str() const noexcept
+{
+	if (this->empty())
+		return {};
+
+	return FormatSystem::template format_rel<string>(this->m_elements);
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+template<class PathSystems>
+template<typename FormatSystem>
+eastl::string rel_path_view<PathSystems>::eastl_str() const noexcept
+{
+	if (this->empty())
+		return {};
+
+	return FormatSystem::template format_rel<eastl::string>(this->m_elements);
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+template<class PathSystems>
+template<typename FormatSystem>
+std::string rel_path_view<PathSystems>::std_str() const noexcept
+{
+	if (this->empty())
+		return {};
+
+	return FormatSystem::template format_rel<std::string>(this->m_elements);
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+template <typename PathSystems>
+rel_path_view<PathSystems> rel_path_view<PathSystems>::subpath(size_t idx, int count /* = 0 */) const noexcept
+{
+	if (count == 0)
+		count = (int)this->size() - (int)idx;
+
+	if (count < 0)
+		count = (int)this->size() - (int)idx + count;
+
+	if (count > 0 && idx < this->size())
+		return rel_path_view<PathSystems>(tl::span(this->m_elements.begin() +  idx, this->m_elements.begin() + idx + count));
+
+	return {};
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+template <typename PathSystems>
+rel_path_view<PathSystems> rel_path_view<PathSystems>::parent() const noexcept
+{
+	if (this->empty())
+	{
+		TL_PLAIN_FAIL("Invalid path");
+		return {};
+	}
+
+	rel_path_view p = *this;
+	p.pop_back();
+	return p;
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+template <typename PathSystems>
+rel_path_view<PathSystems> rel_path_view<PathSystems>::parent(size_t levels) const noexcept
+{
+	if (this->empty() || this->size() <= levels)
+	{
+		TL_PLAIN_FAIL("Invalid path");
+		return {};
+	}
+
+	rel_path_view<PathSystems> p = *this;
+	p.shrink(p.size() - levels);
+
+	return p;
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+template<class PathSystems>
+bool rel_path_view<PathSystems>::is_prefix_of(const rel_path_view& path) const noexcept
+{
+	if (this->size() > path.size())
+		return false;
+
+	for (size_t i = 0, _count = this->size(); i < _count; ++i)
+	{
+		if ((*this)[i] != path[i])
+			return false;
+	}
+
+	return true;
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+template <typename PathSystems>
+template<typename other_rel_path>
+other_rel_path rel_path_view<PathSystems>::cast_to() const noexcept
+{
+	return other_rel_path(this->m_elements);
+}
+
+
+}
+
+//////////////////////////////////////////////////////////////////////////
+
+template <typename T>
+struct std::formatter<tl::rel_path_view<tl::path_systems<T>>>
+{
+	constexpr auto parse(format_parse_context& ctx) noexcept { return ctx.begin(); }
+	auto format(const tl::rel_path_view<tl::path_systems<T>>& p, std::format_context& ctx) const
+	{
+		return format_to(ctx.out(), "{}", p.template str<T>());
+	}
+};
+
+template <typename T>
+struct std::hash<tl::rel_path_view<T>>
+{
+	std::size_t operator()(const tl::rel_path_view<T>& p) const
+	{
+		return p.hash();
+	}
+};
+
+
+template <typename T>
+struct eastl::hash<tl::rel_path_view<T>>
+{
+	std::size_t operator()(const tl::rel_path_view<T>& p) const
+	{
+		return p.hash();
+	}
+};
+