////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Method: Block Comment.
/// </summary>
/// <param name="c"> The char c.</param>
/// <returns>
/// The SourcePreview.TokenType value.
/// </returns>
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
private TokenType BlockComment(char c)
{
while (c != '\0')
{
switch (c)
{
case '\n':
if (Scanner.Token.Length > 0)
{
return(TokenType.Comment);
}
return(Scanner.ScanEol());
case '\r':
c = Scanner.MoveNext();
break;
default:
if (Scanner.Accept(Scanner.Language.BlockComment[1], false))
{
_inBlockComment = false;
return(TokenType.Comment);
}
c = Scanner.AppendMoveNext(c);
break;
}
}
return(TokenType.Comment);
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Method: Classify Character and see what kind of token it is. Override to add functionality.
/// </summary>
/// <param name="c"> The char c.</param>
/// <returns>
/// The SourcePreview.TokenType value.
/// </returns>
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
public override TokenType ClassifyCharacter(char c)
{
if (ScanEolAndWhitespace(c, out var classifyCharacter))
{
return(classifyCharacter);
}
if (_inBlockComment)
{
return(BlockComment(c));
}
var lang = Scanner.Language;
if (lang != null)
{
if (!string.IsNullOrEmpty(lang.LineComment) && Scanner.Accept(lang.LineComment, false))
{
Scanner.EndOfLine();
return(TokenType.Comment);
}
if (lang.BlockComment != null && !string.IsNullOrEmpty(lang.BlockComment[0]) && Scanner.Accept(Scanner.Language.BlockComment[0], false))
{
_inBlockComment = true;
return(BlockComment(Scanner.CurrentChar));
}
}
return(base.ClassifyCharacter(c));
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Method: Scan Comment. Either entering a comment or in a comment after Eol
/// </summary>
/// <returns>
/// The Scan.TokenType value.
/// </returns>
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
private TokenType ScanComment(char c)
{
while (c != '\0' && c != '\n')
{
if (Scanner.Accept("-->", false))
{
_state = State.None;
break;
}
c = Scanner.AppendMoveNext(c);
}
return(TokenType.Comment);
}
private void SkipWhitespace()
{
var whitespaceScan = currentScanner.NextToken(TokenTransitions.Captures.Whitespace);
if (whitespaceScan.Count == 1)
{
currentScanner.Accept(whitespaceScan[0]);
}
}