private static bool AreMarksEqualed(int openedMarkIndex, int closingMarkIndex, string text)
{
var mark = MarkdownTags.GetMarkFromText(openedMarkIndex, text);
return(text.Substring(openedMarkIndex, mark.Length) ==
text.Substring(closingMarkIndex - mark.Length + 1, mark.Length));
}
public void Process()
{
var resultBuilder = new StringBuilder();
var screened = false;
while (currentIndex < text.Length || buffer.Count > 0)
{
switch (GetRenderStatus())
{
case RenderStatus.CheckScreening:
var slashCount = GetSlashesCount();
screened = slashCount % 2 != 0;
resultBuilder.Append(new string('\\', slashCount - slashCount % 2));
currentIndex += slashCount;
break;
case RenderStatus.AppendClosingTag:
AppendFromBuffer(currentIndex, resultBuilder);
break;
case RenderStatus.CheckMarkSymbol:
var tag = TagBuilder.BuildTag(text, currentIndex);
switch (GetTagStatus(tag, screened))
{
case TagStatus.Screened:
screened = false;
buffer[tag.OpenPosition] = tag.Mark;
buffer[tag.ClosePosition - tag.Mark.Length + 1] = tag.Mark;
break;
case TagStatus.Correct:
buffer[tag.OpenPosition] = $"<{tag.TagName}>";
buffer[tag.ClosePosition - tag.Mark.Length + 1] = $"</{tag.TagName}>";
openedTags.Add(tag.TagType);
break;
case TagStatus.Incorrect:
var mark = MarkdownTags.GetMarkFromText(currentIndex, text);
resultBuilder.Append(mark);
currentIndex += mark.Length;
break;
}
break;
case RenderStatus.PlainText:
resultBuilder.Append(text[currentIndex]);
currentIndex++;
break;
}
}
Result = resultBuilder.ToString();
}
private static bool IsTagCorrect(int startIndex, int endIndex, string text)
{
var mark = MarkdownTags.GetMarkFromText(startIndex, text);
var tagContent = GetContent(startIndex, endIndex, text);
return(mark == "#" ||
endIndex < text.Length &&
AreMarksEqualed(startIndex, endIndex, text) &&
!tagContent.Any(char.IsDigit) &&
!string.IsNullOrEmpty(tagContent) &&
!AreMarksInsideDifferentWords(startIndex, endIndex, text));
}
private static string GetContent(int startIndex, int endIndex, string text)
{
var contentBuilder = new StringBuilder();
var mark = MarkdownTags.GetMarkFromText(startIndex, text);
for (var i = startIndex + mark.Length; i <= endIndex - mark.Length; i++)
{
contentBuilder.Append(text[i]);
}
return(contentBuilder.ToString());
}
public static Tag BuildTag(string text, int startIndex)
{
var mark = MarkdownTags.GetMarkFromText(startIndex, text);
if (!MarkdownTags.IsMark(mark))
{
return(Tag.EmptyOn(startIndex));
}
var endPos = FindClosePosition(text, startIndex, mark);
var tagName = MarkdownTags.GetHtmlTagByMark(mark);
return(IsTagCorrect(startIndex, endPos, text)
? Tag.Correct(tagName, startIndex, endPos)
: Tag.Incorrect(tagName, startIndex, endPos));
}
private static int FindClosePosition(string text, int startIndex, string openedMark)
{
var i = startIndex + 1;
var pairMark = MarkdownTags.GetMarkPair(openedMark);
var mark = MarkdownTags.GetMarkFromText(i, text);
while (i < text.Length - openedMark.Length + 1)
{
mark = MarkdownTags.GetMarkFromText(i, text);
if (mark == pairMark && !char.IsWhiteSpace(text[i - 1]))
{
break;
}
i += mark.Length;
}
return(i == text.Length ? i : i + mark.Length - 1);
}
private RenderStatus GetRenderStatus()
{
if (buffer.ContainsKey(currentIndex))
{
return(RenderStatus.AppendClosingTag);
}
if (MarkdownTags.ExpectedToBeMark(currentIndex, text))
{
return(RenderStatus.CheckMarkSymbol);
}
if (currentIndex < text.Length && text[currentIndex] == '\\' &&
MarkdownTags.ExpectedToBeMark(currentIndex + 1, text))
{
return(RenderStatus.CheckScreening);
}
return(RenderStatus.PlainText);
}