/// <summary>
/// 4.4.17. URL state
/// </summary>
CssToken UrlStart(Char current)
{
while (current.IsSpaceCharacter())
{
current = src.Next;
}
switch (current)
{
case Specification.EOF:
RaiseErrorOccurred(ErrorCode.EOF);
return(CssStringToken.Url(String.Empty, true));
case Specification.DQ:
return(UrlDQ(src.Next));
case Specification.SQ:
return(UrlSQ(src.Next));
case ')':
return(CssStringToken.Url(String.Empty, false));
default:
return(UrlUQ(current));
}
}
/// <summary>
/// 4.4.20. URL-end state
/// </summary>
CssToken UrlEnd(Char current)
{
while (true)
{
if (current == ')')
{
return(CssStringToken.Url(FlushBuffer()));
}
else if (!current.IsSpaceCharacter())
{
RaiseErrorOccurred(ErrorCode.InvalidCharacter);
return(UrlBad(current));
}
current = src.Next;
}
}
/// <summary>
/// 4.4.19. URL-single-quoted state
/// </summary>
CssToken UrlSQ(Char current)
{
while (true)
{
if (current.IsLineBreak())
{
RaiseErrorOccurred(ErrorCode.LineBreakUnexpected);
return(UrlBad(src.Next));
}
else if (Specification.EOF == current)
{
return(CssStringToken.Url(FlushBuffer()));
}
else if (current == Specification.SQ)
{
return(UrlEnd(src.Next));
}
else if (current == Specification.RSOLIDUS)
{
current = src.Next;
if (current == Specification.EOF)
{
src.Back(2);
RaiseErrorOccurred(ErrorCode.EOF);
return(CssStringToken.Url(FlushBuffer(), true));
}
else if (current.IsLineBreak())
{
stringBuffer.AppendLine();
}
else
{
stringBuffer.Append(ConsumeEscape(current));
}
}
else
{
stringBuffer.Append(current);
}
current = src.Next;
}
}
/// <summary>
/// 4.4.22. Bad URL state
/// </summary>
CssToken UrlBad(Char current)
{
while (true)
{
if (current == Specification.EOF)
{
RaiseErrorOccurred(ErrorCode.EOF);
return(CssStringToken.Url(FlushBuffer(), true));
}
else if (current == ')')
{
return(CssStringToken.Url(FlushBuffer(), true));
}
else if (IsValidEscape(current))
{
current = src.Next;
stringBuffer.Append(ConsumeEscape(current));
}
current = src.Next;
}
}
/// <summary>
/// 4.4.21. URL-unquoted state
/// </summary>
CssToken UrlUQ(Char current)
{
while (true)
{
if (current.IsSpaceCharacter())
{
return(UrlEnd(src.Next));
}
else if (current == ')' || current == Specification.EOF)
{
return(CssStringToken.Url(FlushBuffer()));
}
else if (current == Specification.DQ || current == Specification.SQ || current == '(' || current.IsNonPrintable())
{
RaiseErrorOccurred(ErrorCode.InvalidCharacter);
return(UrlBad(src.Next));
}
else if (current == Specification.RSOLIDUS)
{
if (IsValidEscape(current))
{
current = src.Next;
stringBuffer.Append(ConsumeEscape(current));
}
else
{
RaiseErrorOccurred(ErrorCode.InvalidCharacter);
return(UrlBad(src.Next));
}
}
else
{
stringBuffer.Append(current);
}
current = src.Next;
}
}
