public static string AutoBreakLine(string text, int maximumLength, int mergeLinesShorterThan, string language)
{
if (text == null || text.Length < 3)
{
return(text);
}
// do not autobreak dialogs
if (Contains(text, '-') && text.Contains(Environment.NewLine))
{
var noTagLines = HtmlUtil.RemoveHtmlTags(text, true).SplitToLines();
if (noTagLines.Length == 2)
{
var arr0 = noTagLines[0].Trim().TrimEnd('"', '\'').TrimEnd();
if (arr0.StartsWith('-') && noTagLines[1].TrimStart().StartsWith('-') && arr0.Length > 1 && (Contains(".?!)]", arr0[arr0.Length - 1]) || arr0.EndsWith("--", StringComparison.Ordinal) || arr0.EndsWith('–')))
{
return(text);
}
}
}
string s = RemoveLineBreaks(text);
if (HtmlUtil.RemoveHtmlTags(s, true).Length < mergeLinesShorterThan)
{
return(s);
}
var htmlTags = new Dictionary <int, string>();
var sb = new StringBuilder();
int six = 0;
while (six < s.Length)
{
var letter = s[six];
bool tagFound = false;
if (letter == '<')
{
string tagString = s.Substring(six);
tagFound = tagString.StartsWith("<font", StringComparison.OrdinalIgnoreCase) ||
tagString.StartsWith("</font", StringComparison.OrdinalIgnoreCase) ||
tagString.StartsWith("<u", StringComparison.OrdinalIgnoreCase) ||
tagString.StartsWith("</u", StringComparison.OrdinalIgnoreCase) ||
tagString.StartsWith("<b", StringComparison.OrdinalIgnoreCase) ||
tagString.StartsWith("</b", StringComparison.OrdinalIgnoreCase) ||
tagString.StartsWith("<i", StringComparison.OrdinalIgnoreCase) ||
tagString.StartsWith("</i", StringComparison.OrdinalIgnoreCase);
}
int endIndex = -1;
if (tagFound)
{
endIndex = s.IndexOf('>', six + 1);
}
if (tagFound && endIndex > 0)
{
string tag = s.Substring(six, endIndex - six + 1);
s = s.Remove(six, tag.Length);
if (htmlTags.ContainsKey(six))
{
htmlTags[six] = htmlTags[six] + tag;
}
else
{
htmlTags.Add(six, tag);
}
}
else
{
sb.Append(letter);
six++;
}
}
s = sb.ToString();
int splitPos = -1;
int mid = s.Length / 2;
// try to find " - " with uppercase letter after (dialog)
if (s.Contains(" - "))
{
for (int j = 0; j <= (maximumLength / 2) + 5; j++)
{
if (mid + j + 4 < s.Length)
{
if (s[mid + j] == '-' && s[mid + j + 1] == ' ' && s[mid + j - 1] == ' ')
{
string rest = s.Substring(mid + j + 1).TrimStart();
if (rest.Length > 0 && char.IsUpper(rest[0]))
{
splitPos = mid + j;
break;
}
}
}
if (mid - (j + 1) > 4)
{
if (s[mid - j] == '-' && s[mid - j + 1] == ' ' && s[mid - j - 1] == ' ')
{
string rest = s.Substring(mid - j + 1).TrimStart();
if (rest.Length > 0 && char.IsUpper(rest[0]))
{
if (mid - j > 5 && s[mid - j - 1] == ' ')
{
if (Contains("!?.", s[mid - j - 2]))
{
splitPos = mid - j;
break;
}
var first = s.Substring(0, mid - j - 1);
if (first.EndsWith(".\"", StringComparison.Ordinal) || first.EndsWith("!\"", StringComparison.Ordinal) || first.EndsWith("?\"", StringComparison.Ordinal))
{
splitPos = mid - j;
break;
}
}
}
}
}
}
}
if (splitPos == maximumLength + 1 && s[maximumLength] != ' ') // only allow space for last char (as it does not count)
{
splitPos = -1;
}
if (splitPos < 0)
{
const string expectedChars1 = ".!?0123456789";
const string expectedChars2 = ".!?";
for (int j = 0; j < 15; j++)
{
if (mid + j + 1 < s.Length && mid + j > 0)
{
if (Contains(expectedChars2, s[mid + j]) && !IsPartOfNumber(s, mid + j) && CanBreak(s, mid + j + 1, language))
{
splitPos = mid + j + 1;
if (Contains(expectedChars1, s[splitPos]))
{ // do not break double/tripple end lines like "!!!" or "..."
splitPos++;
if (Contains(expectedChars1, s[mid + j + 1]))
{
splitPos++;
}
}
break;
}
if (Contains(expectedChars2, s[mid - j]) && !IsPartOfNumber(s, mid - j) && CanBreak(s, mid - j, language))
{
splitPos = mid - j;
splitPos++;
break;
}
}
}
}
if (splitPos > maximumLength) // too long first line
{
if (splitPos != maximumLength + 1 || s[maximumLength] != ' ') // allow for maxlength+1 char to be space (does not count)
{
splitPos = -1;
}
}
else if (splitPos >= 0 && s.Length - splitPos > maximumLength) // too long second line
{
splitPos = -1;
}
if (splitPos < 0)
{
const string expectedChars1 = ".!?, ";
const string expectedChars2 = " .!?";
const string expectedChars3 = ".!?";
for (int j = 0; j < 25; j++)
{
if (mid + j + 1 < s.Length && mid + j > 0)
{
if (Contains(expectedChars1, s[mid + j]) && !IsPartOfNumber(s, mid + j) && s.Length > mid + j + 2 && CanBreak(s, mid + j, language))
{
splitPos = mid + j;
if (Contains(expectedChars2, s[mid + j + 1]))
{
splitPos++;
if (Contains(expectedChars2, s[mid + j + 2]))
{
splitPos++;
}
}
break;
}
if (Contains(expectedChars1, s[mid - j]) && !IsPartOfNumber(s, mid - j) && s.Length > mid + j + 2 && CanBreak(s, mid - j, language))
{
splitPos = mid - j;
if (Contains(expectedChars3, s[splitPos]))
{
splitPos--;
}
if (Contains(expectedChars3, s[splitPos]))
{
splitPos--;
}
if (Contains(expectedChars3, s[splitPos]))
{
splitPos--;
}
break;
}
}
}
}
if (splitPos < 0)
{
splitPos = mid;
s = s.Insert(mid - 1, Environment.NewLine);
s = ReInsertHtmlTags(s, htmlTags);
htmlTags = new Dictionary <int, string>();
s = s.Replace(Environment.NewLine, "-");
}
if (splitPos < s.Length - 2)
{
s = s.Substring(0, splitPos) + Environment.NewLine + s.Substring(splitPos);
}
s = ReInsertHtmlTags(s, htmlTags);
var idx = s.IndexOf(Environment.NewLine + "</", StringComparison.Ordinal);
if (idx > 2)
{
var endIdx = s.IndexOf('>', idx + 2);
if (endIdx > idx)
{
var tag = s.Substring(idx + Environment.NewLine.Length, endIdx - (idx + Environment.NewLine.Length) + 1);
s = s.Insert(idx, tag);
s = s.Remove(idx + tag.Length + Environment.NewLine.Length, tag.Length);
}
}
s = s.Replace(" " + Environment.NewLine, Environment.NewLine);
s = s.Replace(Environment.NewLine + " ", Environment.NewLine);
return(s.TrimEnd());
}
public static int CountWords(this string source)
{
return(HtmlUtil.RemoveHtmlTags(source, true).Split(new[] { ' ', '\n', '\r' }, StringSplitOptions.RemoveEmptyEntries).Length);
}