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;
}
// 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;
}
private bool DoLineStartsWith(int offset, NSString text)
{
bool match = false;
NSString buffer = m_textView.Value.textStorage().string_();
if (offset + text.length() <= buffer.length())
{
int result = buffer.compare_options_range(text, 0, new NSRange(offset, (int) text.length()));
match = result == Enums.NSOrderedSame;
// Console.WriteLine("'{0}...' == '{1}' = {2}", buffer.ToString().Substring(offset, 12).EscapeAll(), text.ToString(), match);
}
return match;
}
private bool DoMatchesWord(NSString text, int location, int length, Regex word)
{
bool matches = false;
if (location >= 0 && location + length <= text.length())
{
string str;
text.getCharacters_range(new NSRange(location, length), out str);
Match match = word.Match(str);
matches = match.Success && match.Length == str.Length;
}
return matches;
}
private int DoGetLineStartFromSpaceOrTab(NSString text, int index)
{
bool within = false;
if (index < text.length() && (text[index] == ' ' || text[index] == '\t'))
{
while (index > 0 && (text[index] == ' ' || text[index] == '\t'))
--index;
if (index >= 0 && (text[index] == '\n' || text[index] == '\r'))
within = true;
}
return within ? index + 1 : -1;
}
// Returns a new index >= 0 and <= text.length()
// and <= than the original index, unless a negative value was passed in.
// Returns the same index if the previous character is a newline.
private int DoGetLineStart(NSString text, int index)
{
int len = (int)text.length();
if (len == 0) return 0;
if (index > len) index = len - 1;
else if (index < 0) index = 0;
if (index > 0 && text[index-1] == '\n') return index;
while (index > 0 && text[index-1] != '\n') --index;
if (index < 0) index = 0;
return index;
}
private int DoGetLeadingTabCount(NSString text, int i)
{
Contract.Requires(text != null && !text.IsNil());
Contract.Requires(i >= 0);
Contract.Requires(i == 0 || text[i-1] == '\n');
var textLen = text.length();
var j = i;
while (j < textLen && text[j] == '\t') j++;
return j - i;
}
// 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;
}
