/// <summary>
/// Attempts to parse a bold text span.
/// </summary>
/// <param name="markdown"> The markdown text. </param>
/// <param name="start"> The location to start parsing. </param>
/// <param name="maxEnd"> The location to stop parsing. </param>
/// <returns> A parsed bold text span, or <c>null</c> if this is not a bold text span. </returns>
internal static Helpers.Common.InlineParseResult Parse(string markdown, int start, int maxEnd)
{
if (start >= maxEnd - 1)
{
return(null);
}
// Check the start sequence.
string startSequence = markdown.Substring(start, 2);
if (startSequence != "**")
{
return(null);
}
// Find the end of the span. The end sequence (either '**' or '__') must be the same
// as the start sequence.
var innerStart = start + 2;
int innerEnd = Helpers.Common.IndexOf(markdown, startSequence, innerStart, maxEnd);
if (innerEnd == -1)
{
return(null);
}
// The span must contain at least one character.
if (innerStart == innerEnd)
{
return(null);
}
// The first character inside the span must NOT be a space.
if (Helpers.Common.IsWhiteSpace(markdown[innerStart]))
{
return(null);
}
// The last character inside the span must NOT be a space.
if (Helpers.Common.IsWhiteSpace(markdown[innerEnd - 1]))
{
return(null);
}
// We found something!
var result = new BoldTextInline();
result.Inlines = Helpers.Common.ParseInlineChildren(markdown, innerStart, innerEnd);
return(new Helpers.Common.InlineParseResult(result, start, innerEnd + 2));
}
/// <summary>
/// Attempts to parse a bold text span.
/// </summary>
/// <param name="markdown"> The markdown text. </param>
/// <param name="start"> The location to start parsing. </param>
/// <param name="maxEnd"> The location to stop parsing. </param>
/// <returns> A parsed bold text span, or <c>null</c> if this is not a bold text span. </returns>
internal static Helpers.Common.InlineParseResult Parse(string markdown, int start, int maxEnd)
{
if (start >= maxEnd - 3)
{
return(null);
}
if (markdown == null || markdown.Length < 6)
{
return(null);
}
// Check the start sequence.
string startSequence = markdown.Substring(start, 3);
if (startSequence != "***" && startSequence != "___")
{
return(null);
}
// Find the end of the span. The end sequence (either '***' or '___') must be the same
// as the start sequence.
var innerStart = start + 3;
int innerEnd = Helpers.Common.IndexOf(markdown, startSequence, innerStart, maxEnd);
if (innerEnd == -1)
{
return(null);
}
// The span must contain at least one character.
if (innerStart == innerEnd)
{
return(null);
}
// The first character inside the span must NOT be a space.
if (Helpers.Common.IsWhiteSpace(markdown[innerStart]))
{
return(null);
}
// The last character inside the span must NOT be a space.
if (Helpers.Common.IsWhiteSpace(markdown[innerEnd - 1]))
{
return(null);
}
// We found something!
var bold = new BoldTextInline
{
Inlines = new List <MarkdownInline>
{
new ItalicTextInline
{
Inlines = Helpers.Common.ParseInlineChildren(markdown, innerStart, innerEnd)
}
}
};
return(new Helpers.Common.InlineParseResult(bold, start, innerEnd + 3));
}