private void TextBox_StyleNeeded(object sender, ScintillaNET.StyleNeededEventArgs e)
{
ScintillaNET.Scintilla scintilla = ((ScintillaNET.Scintilla)sender);
var startPos = scintilla.GetEndStyled();
var endPos = e.Position;
scintilla.StartStyling(100);
scintilla.SetStyling(100, 1);
scintilla.SetStyling(100, 2);
}
public override void Highlight(ScintillaNET.Scintilla sci, int start, int end, AppSettings s)
{
bool startsWithNL = sci.GetCharAt(start) == '\n' || (start + 1 < sci.TextLength && sci.GetCharAt(start) == '\r' && sci.GetCharAt(start + 1) == '\n');
bool endsWithNL = sci.GetCharAt(end) == '\n' || (end - 1 >= 0 && sci.GetCharAt(end - 1) == '\n');
// move back to start of line
if (!startsWithNL)
{
for (int i = 0; i < MAX_BACKTRACE && start > 0; i++, start--)
{
if (start > 0 && sci.GetCharAt(start - 1) == '\n')
{
break;
}
}
}
// move forward to end of line
if (!endsWithNL)
{
for (int i = 0; i < MAX_FORWARDTRACE && end < sci.TextLength; i++, end++)
{
if (end >= sci.TextLength || sci.GetCharAt(end) == '\n')
{
break;
}
}
}
var text = sci.GetTextRange(start, end - start);
if (s.LinkMode != LinkHighlightMode.Disabled)
{
LinkHighlight(sci, start, text);
}
else
{
sci.StartStyling(start);
sci.SetStyling(end - start, STYLE_DEFAULT);
}
}
private void HighlightLine(ScintillaNET.Scintilla sci, string text, AppSettings s)
{
if (text.TrimStart().StartsWith("#") && text.TrimStart().TrimStart('#').StartsWith(" "))
{
sci.SetStyling(text.Length, STYLE_MD_HEADER);
return;
}
if (text.StartsWith(" "))
{
sci.SetStyling(text.Length, STYLE_MD_CODE);
return;
}
var position = 0;
var mode = ParserMode.None;
bool isLineStart = true;
for (int i = 0; i < text.Length; i++)
{
var enumNumLen = 0;
var isDoubleStar = (i + 2 < text.Length) && text[i] == '*' && text[i + 1] == '*';
var isSingleStar = !isDoubleStar && (i + 1 < text.Length) && text[i] == '*';
var isBacktick = text[i] == '`';
var isOpenBrace = text[i] == '[';
var isEnumStar = isLineStart && (i + 1 < text.Length) && text[i] == '*' && (text[i + 1] == ' ' || text[i + 1] == '\t');
var isEnumDash = isLineStart && (i + 1 < text.Length) && text[i] == '-' && (text[i + 1] == ' ' || text[i + 1] == '\t');
var isEnumPlus = isLineStart && (i + 1 < text.Length) && text[i] == '+' && (text[i + 1] == ' ' || text[i + 1] == '\t');
var isEnumNumber = isLineStart && ParseMarkdownEnumNumber(text.Substring(i), out enumNumLen);
if (text[i] != ' ' && text[i] != '\t')
{
isLineStart = false;
}
if (mode == ParserMode.None)
{
if (isDoubleStar)
{
sci.SetStyling(i - position, STYLE_MD_DEFAULT);
position += (i - position);
mode = ParserMode.Bold;
continue;
}
else if (isSingleStar)
{
sci.SetStyling(i - position, STYLE_MD_DEFAULT);
position += (i - position);
mode = ParserMode.Italic;
continue;
}
else if (isBacktick)
{
sci.SetStyling(i - position, STYLE_MD_DEFAULT);
position += (i - position);
mode = ParserMode.CodeTick;
continue;
}
else if (isOpenBrace)
{
var found = ParseMarkdownLink(text.Substring(i), s.LinkMode, out var len1, out var len2, out var len3);
if (found)
{
sci.SetStyling(i - position, STYLE_MD_DEFAULT);
position += (i - position);
sci.SetStyling(len1, STYLE_MD_URL);
if (len2 > 0)
{
sci.SetStyling(len2, STYLE_MD_CLICKURL);
}
sci.SetStyling(len3, STYLE_MD_URL);
position += len1 + len2 + len3;
i = position;
continue;
}
}
else if (isEnumStar || isEnumDash || isEnumPlus)
{
sci.SetStyling(i - position, STYLE_MD_DEFAULT);
position += (i - position);
sci.SetStyling(2, STYLE_MD_LIST);
position += 2;
i = position - 1;
mode = ParserMode.None;
continue;
}
else if (isEnumNumber)
{
sci.SetStyling(i - position, STYLE_MD_DEFAULT);
position += (i - position);
sci.SetStyling(enumNumLen, STYLE_MD_LIST);
position += enumNumLen;
i = position - 1;
continue;
}
}
else if (mode == ParserMode.Bold)
{
if (isDoubleStar)
{
i++;
sci.SetStyling(i - position + 1, STYLE_MD_BOLD);
position += (i - position + 1);
mode = ParserMode.None;
continue;
}
}
else if (mode == ParserMode.Italic)
{
if (isSingleStar)
{
sci.SetStyling(i - position + 1, STYLE_MD_ITALIC);
position += (i - position + 1);
mode = ParserMode.None;
continue;
}
}
else if (mode == ParserMode.CodeTick)
{
if (isBacktick)
{
sci.SetStyling(i - position + 1, STYLE_MD_CODE);
position += (i - position + 1);
mode = ParserMode.None;
continue;
}
}
}
sci.SetStyling(text.Length - position, STYLE_MD_DEFAULT);
}
private void HighlightFencedLine(ScintillaNET.Scintilla sci, string text)
{
sci.SetStyling(text.Length, STYLE_MD_CODE);
}