/// <summary>
/// Scans through the window and generates a WhiteSpace SyntaxNode/Trivia
/// </summary>
/// <param name="TextWindow"></param>
/// <returns></returns>
public static SyntaxTrivia Scan(SlidingTextWindow TextWindow)
{
// Default to OnlyWhiteSpace true
Boolean bIsOnlySpaces = true;
Boolean bEndOfTrivia = false;
String sCharactersScannedSoFar = String.Empty;
while (!bEndOfTrivia && TextWindow.HasCharactersLeftToProcess())
{
// Peek at a character
char ch = TextWindow.PeekCharacter();
switch (ch)
{
case '\t': // Horizontal tab
case '\v': // Vertical Tab
case '\f': // Form-feed
case '\u001A':
bIsOnlySpaces = false;
goto case ' ';
case ' ':
sCharactersScannedSoFar += TextWindow.PopCharacter();
break;
case '\r': // Carriage Return
case '\n': // Line-feed
// End iteration
bEndOfTrivia = true;
break;
default:
if (ch > 127 && SyntaxUtilities.IsWhiteSpace(ch))
{
goto case '\t';
}
bEndOfTrivia = true;
break;
}
}
// Return the specific instance where possible
if (sCharactersScannedSoFar.Length == 0)
{
return(null);
}
if (bIsOnlySpaces && sCharactersScannedSoFar.Length == 1)
{
return(SyntaxFactory.Space);
}
else
{
return(SyntaxFactory.WhiteSpace(sCharactersScannedSoFar));
}
}
