private Block BadUrl(char current)
{
while (true)
{
if (current == Specification.EndOfFile)
{
ErrorHandler(ParserError.EndOfFile, ErrorMessages.InvalidUrlEnd);
return(StringBlock.Url(FlushBuffer(), true));
}
if (current == Specification.ParenClose)
{
return(StringBlock.Url(FlushBuffer(), true));
}
if (IsValidEscape(current))
{
current = _stylesheetReader.Next;
_buffer.Append(ConsumeEscape(current));
}
current = _stylesheetReader.Next;
}
}
private Block UrlStart(char current)
{
while (current.IsSpaceCharacter())
{
current = _stylesheetReader.Next;
}
switch (current)
{
case Specification.EndOfFile:
ErrorHandler(ParserError.EndOfFile, ErrorMessages.InvalidUrlEnd);
return(StringBlock.Url(string.Empty, true));
case Specification.DoubleQuote:
return(DoubleQuotedUrl(_stylesheetReader.Next));
case Specification.SingleQuote:
return(SingleQuoteUrl(_stylesheetReader.Next));
case ')':
return(StringBlock.Url(string.Empty));
default:
return(UnquotedUrl(current));
}
}
private Block SingleQuoteUrl(char current)
{
while (true)
{
if (current.IsLineBreak())
{
ErrorHandler(ParserError.UnexpectedLineBreak, ErrorMessages.SingleQuotedString);
return(BadUrl(_stylesheetReader.Next));
}
if (Specification.EndOfFile == current)
{
return(StringBlock.Url(FlushBuffer()));
}
if (current == Specification.SingleQuote)
{
return(UrlEnd(_stylesheetReader.Next));
}
if (current == Specification.ReverseSolidus)
{
current = _stylesheetReader.Next;
if (current == Specification.EndOfFile)
{
_stylesheetReader.Back(2);
ErrorHandler(ParserError.EndOfFile, ErrorMessages.SingleQuotedString);
return(StringBlock.Url(FlushBuffer(), true));
}
if (current.IsLineBreak())
{
_buffer.AppendLine();
}
else
{
_buffer.Append(ConsumeEscape(current));
}
}
else
{
_buffer.Append(current);
}
current = _stylesheetReader.Next;
}
}
private Block UrlEnd(char current)
{
while (true)
{
if (current == Specification.ParenClose)
{
return(StringBlock.Url(FlushBuffer()));
}
if (!current.IsSpaceCharacter())
{
ErrorHandler(ParserError.InvalidCharacter, ErrorMessages.InvalidUrlCharacter);
return(BadUrl(current));
}
current = _stylesheetReader.Next;
}
}
private Block UnquotedUrl(char current)
{
while (true)
{
if (current.IsSpaceCharacter())
{
return(UrlEnd(_stylesheetReader.Next));
}
if (current == Specification.ParenClose || current == Specification.EndOfFile)
{
return(StringBlock.Url(FlushBuffer()));
}
if (current == Specification.DoubleQuote || current == Specification.SingleQuote ||
current == Specification.ParenOpen || current.IsNonPrintable())
{
ErrorHandler(ParserError.InvalidCharacter, ErrorMessages.InvalidUrlQuote);
return(BadUrl(_stylesheetReader.Next));
}
if (current == Specification.ReverseSolidus)
{
if (IsValidEscape(current))
{
current = _stylesheetReader.Next;
_buffer.Append(ConsumeEscape(current));
}
else
{
ErrorHandler(ParserError.InvalidCharacter, ErrorMessages.InvalidUrlCharacter);
return(BadUrl(_stylesheetReader.Next));
}
}
else
{
_buffer.Append(current);
}
current = _stylesheetReader.Next;
}
}