Function IsValidChar

src/string.cpp:373–384

* Only allow certain keys. You can define the filter to be used. This makes * sure no invalid keys can get into an editbox, like BELL. * @param key character to be checked * @param afilter the filter to use * @return true or false depending if the character is printable/valid or not */

 * @return true or false depending if the character is printable/valid or not
 */
bool IsValidChar(char32_t key, CharSetFilter afilter)
{
	switch (afilter) {
		case CS_ALPHANUMERAL:   return IsPrintable(key);
		case CS_NUMERAL:        return (key >= '0' && key <= '9');
		case CS_NUMERAL_SPACE:  return (key >= '0' && key <= '9') || key == ' ';
		case CS_NUMERAL_SIGNED: return (key >= '0' && key <= '9') || key == '-';
		case CS_ALPHA:          return IsPrintable(key) && !(key >= '0' && key <= '9');
		case CS_HEXADECIMAL:    return (key >= '0' && key <= '9') || (key >= 'a' && key <= 'f') || (key >= 'A' && key <= 'F');
		default: NOT_REACHED();
	}
}

/**
 * Test if a unicode character is considered garbage to be skipped.