1 files changed, 108 insertions, 0 deletions
diff --git a/libs/litehtml/src/num_cvt.cpp b/libs/litehtml/src/num_cvt.cpp
new file mode 100644
index 0000000000..23d594b5c9
--- /dev/null
+++ b/libs/litehtml/src/num_cvt.cpp
@@ -0,0 +1,108 @@
+#include "num_cvt.h"
+#include "utf8_strings.h"
+#include <vector>
+
+static std::vector<char> latin_lower = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z' };
+static std::vector<char> latin_upper = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' };
+static std::vector<std::wstring> greek_lower = { L"α", L"β", L"γ", L"δ", L"ε", L"ζ", L"η", L"θ", L"ι", L"κ", L"λ", L"μ", L"ν", L"ξ", L"ο", L"π", L"ρ", L"σ", L"τ", L"υ", L"φ", L"χ", L"ψ", L"ω" };
+
+static litehtml::string to_mapped_alpha(int num, const std::vector<char>& map)
+{
+	int dividend = num;
+	litehtml::string out;
+	int modulo;
+
+	while (dividend > 0)
+	{
+		modulo = (dividend - 1) % map.size();
+		out = map[modulo] + out;
+		dividend = (int)((dividend - modulo) / map.size());
+	}
+
+	return out;
+}
+
+static litehtml::string to_mapped_alpha(int num, const std::vector<std::wstring>& map)
+{
+	int dividend = num;
+	litehtml::string out;
+	int modulo;
+
+	while (dividend > 0)
+	{
+		modulo = (dividend - 1) % map.size();
+		out = litehtml_from_wchar(map[modulo]).c_str() + out;
+		dividend = (int)((dividend - modulo) / map.size());
+	}
+
+	return out;
+}
+
+litehtml::string litehtml::num_cvt::to_latin_lower(int val)
+{
+	return to_mapped_alpha(val, latin_lower);
+}
+
+litehtml::string litehtml::num_cvt::to_latin_upper(int val)
+{
+	return to_mapped_alpha(val, latin_upper);
+}
+
+litehtml::string litehtml::num_cvt::to_greek_lower(int val)
+{
+	return to_mapped_alpha(val, greek_lower);
+}
+
+litehtml::string litehtml::num_cvt::to_roman_lower(int value)
+{
+	struct romandata_t { int value; const char* numeral; };
+	const struct romandata_t romandata[] =
+	{
+		{ 1000, "m" }, { 900, "cm" },
+		{ 500, "d" }, { 400, "cd" },
+		{ 100, "c" }, { 90, "xc" },
+		{ 50, "l" }, { 40, "xl" },
+		{ 10, "x" }, { 9, "ix" },
+		{ 5, "v" }, { 4, "iv" },
+		{ 1, "i" },
+		{ 0, nullptr } // end marker
+	};
+
+	litehtml::string result;
+	for (const romandata_t* current = romandata; current->value > 0; ++current)
+	{
+		while (value >= current->value)
+		{
+			result += current->numeral;
+			value -= current->value;
+		}
+	}
+	return result;
+}
+
+litehtml::string litehtml::num_cvt::to_roman_upper(int value)
+{
+	struct romandata_t { int value; const char* numeral; };
+	const struct romandata_t romandata[] =
+	{
+		{ 1000, "M" }, { 900, "CM" },
+		{ 500, "D" }, { 400, "CD" },
+		{ 100, "C" }, { 90, "XC" },
+		{ 50, "L" }, { 40, "XL" },
+		{ 10, "X" }, { 9, "IX" },
+		{ 5, "V" }, { 4, "IV" },
+		{ 1, "I" },
+		{ 0, nullptr } // end marker
+	};
+
+	litehtml::string result;
+	for (const romandata_t* current = romandata; current->value > 0; ++current)
+	{
+		while (value >= current->value)
+		{
+			result += current->numeral;
+			value -= current->value;
+		}
+	}
+	return result;
+}