get rid of nasty stdlib

1 files changed, 81 insertions, 0 deletions

diff --git a/lib/nes/common/containers/string-view.cc b/lib/nes/common/containers/string-view.cc
new file mode 100644
index 0000000..8265d09
--- /dev/null
+++ b/lib/nes/common/containers/string-view.cc
@@ -0,0 +1,81 @@
+#include "nes/common/containers/string-view.hh"
+#include "nes/common/debug.hh"
+
+namespace nes
+{
+	namespace
+	{
+		auto compute_length(char const* c_string) -> u32
+		{
+			auto res = u32{ 0 };
+			while (*c_string)
+			{
+				res += 1;
+				c_string++;
+			}
+			return res;
+		}
+	} // namespace
+
+	string_view::string_view(span<char const> const data)
+		: data_{ data }
+	{
+	}
+
+	string_view::string_view(char const* data, u32 length)
+		: data_{ data, length }
+	{
+	}
+
+	string_view::string_view(char const* c_string)
+		: string_view{ c_string, compute_length(c_string) }
+	{
+	}
+
+	auto string_view::get_first() const -> char
+	{
+		NES_ASSERT(!is_empty() && "unable to get character of empty string");
+		return data_[0];
+	}
+
+	auto string_view::get_last() const -> char
+	{
+		NES_ASSERT(!is_empty() && "unable to get character of empty string");
+		return data_[data_.get_length() - 1];
+	}
+
+	auto string_view::contains(char const needle) const -> bool
+	{
+		for (const auto c : *this)
+		{
+			if (c == needle) { return true; }
+		}
+		return false;
+	}
+
+	auto string_view::substring(u32 const first) const -> string_view
+	{
+		return string_view{ data_.subspan(first) };
+	}
+
+	auto string_view::substring(u32 const first, u32 const length) const -> string_view
+	{
+		return string_view{ data_.subspan(first, length) };
+	}
+
+	auto operator==(string_view const lhs, string_view const rhs) -> bool
+	{
+		if (lhs.get_length() != rhs.get_length()) { return false; }
+
+		for (auto i = u32{ 0 }; i < lhs.get_length(); ++i)
+		{
+			if (lhs[i] != rhs[i]) { return false; }
+		}
+
+		return true;
+	}
+	auto operator!=(string_view const lhs, string_view const rhs) -> bool
+	{
+		return !(lhs == rhs);
+	}
+} // namespace nes
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