private Dictionary<char, int> DoFindControlChars(NSString str)
{
var chars = new Dictionary<char, int>();
int len = (int) str.length();
NSRange range = new NSRange(0, len);
while (true)
{
NSRange temp = str.rangeOfCharacterFromSet_options_range(
NSCharacterSet.controlCharacterSet(),
Enums.NSLiteralSearch,
range);
if (temp.length == 0)
break;
char ch = str.characterAtIndex((uint) temp.location);
if (ch != '\r' && ch != '\n' && ch != '\t' && ch != Constants.BOM[0])
{
if (chars.ContainsKey(ch))
chars[ch] = chars[ch] + 1;
else
chars[ch] = 1;
}
range = new NSRange(temp.location + 1, len - (temp.location + 1));
}
return chars;
}
// Return the number of space characters at index and before.
private int DoGetSpaceCount(NSString text, int index)
{
int count = 0;
while (index >= 0)
{
char ch = text.characterAtIndex((uint) index);
if (ch != ' ')
break;
++count;
--index;
}
return count;
}
// Note that Dictionary.app will fall back to wikipedia for phrases so we
// want to allow spaces.
public bool canLookupInDictionary(NSString text)
{
if (NSObject.IsNullOrNil(text))
return false;
if (text.length() == 0)
return false;
if (!char.IsLetter(text.characterAtIndex(0)))
return false;
if (text.Any(c => c == '\t' || c == '\r' || c == '\n'))
return false;
return true;
}
// If the line is blank then this will return the number of blank characters.
private int DoGetBlankCount(NSString text, int index)
{
for (int i = index; i < text.length(); ++i)
{
char ch = text.characterAtIndex((uint) i);
if (ch == '\n')
return i - index;
else if (ch != ' ' && ch != '\t')
break;
}
return 0;
}