OTBS Sample
ActivePublic
Actions

Authored by jcmcdonald on Mar 27 2020, 1:11 PM.

Tags

Subscribers

None

	/* Convert an integer to a string
	* \param the integer to convert
	* \param the base for the conversion, default base-10
	* \param letter case to use for digits greater than 9
	* \param the notation to use for non-decimal bases.
	* \return the string representing the value.
	*/
	template<typename T>
	std::string stringify_integral (const T& val,
	const IOFormatBase& base = IOFormatBase::dec,
	const IOFormatSign& sign = IOFormatSign::automatic,
	const IOFormatNumCase& num_case = IOFormatNumCase::upper,
	const IOFormatBaseNotation& notation = IOFormatBaseNotation::prefix)
	{
	/* IMPLEMENTATION MEMO: itos() is not portable, and std::to_string()
	does not support multiple bases at this time. Therefore, a custom
	solution is called for. */

	// If the number is zero, skip everything else and return that.
	if (val == 0) {
	return "0";
	}

	unsigned int _base = static_cast<unsigned int> (base);

	/* Create a new string with a reserved length matching the expected
	* length of the string. */
	std::string str = std::string();
	str.reserve (lengthify_integral (val, base, sign));

	bool prefix = false;

	if (notation == IOFormatBaseNotation::prefix &&
	(_base == 2 \|\| _base == 3 \|\| _base == 8 \|\| _base == 12 \|\| _base == 16)) {
	prefix = true;
	} else if (_base != 10 && notation != IOFormatBaseNotation::none) {
	str += DIGIT_CHARS_LOWER[_base % 10];

	if (_base > 10) {
	str += DIGIT_CHARS_LOWER[_base / 10];
	}

	str += '_';

	}

	/* Make a copy of the number for mutating.
	* If it's negative, make it positive. */
	T number = (val >= 0) ? val : -val;

	while (number) {
	size_t digit = number % _base;

	switch (num_case) {
	case IOFormatNumCase::lower:
	str += DIGIT_CHARS_LOWER[digit];
	break;

	case IOFormatNumCase::upper:
	str += DIGIT_CHARS_UPPER[digit];
	break;
	}

	number /= _base;
	}

	if (prefix) {
	switch (_base) {
	case 2:
	str += 'b';
	break;

	case 3:
	str += 't';
	break;

	case 8:
	str += 'o';
	break;

	case 12:
	str += 'z';
	break;

	case 16:
	str += 'x';
	break;
	}

	str += '0';
	}

	if (val < 0) {
	str += "-";
	} else if (sign == IOFormatSign::always) {
	str += "+";
	}

	return reverse (str);
	}

	std::string stringify_char (const char& val,
	const IOFormatCharValue& as = IOFormatCharValue::as_char)
	{
	switch (as) {
	case IOFormatCharValue::as_char:
	return std::string (1, val);

	case IOFormatCharValue::as_int:
	return stringify_integral (val, IOFormatBase::dec);
	}

	return "";
	}

Event Timeline

jcmcdonald created this paste.Mar 27 2020, 1:11 PM

jcmcdonald mentioned this in Unknown Object (Slowvote Poll).

OTBS SampleActivePublicActions

Event Timeline

OTBS Sample
ActivePublic
Actions