/// <summary>
/// 4.4.17. URL state
/// </summary>
CssToken UrlStart(Char current, CssTokenType type)
{
while (current.IsSpaceCharacter())
{
current = _src.Next;
}
switch (current)
{
case Specification.EndOfFile:
RaiseErrorOccurred(ErrorCode.EOF);
return(CssStringToken.Url(type, String.Empty, true));
case Specification.DoubleQuote:
return(UrlDQ(_src.Next, type));
case Specification.SingleQuote:
return(UrlSQ(_src.Next, type));
case ')':
return(CssStringToken.Url(type, String.Empty, false));
default:
return(UrlUQ(current, type));
}
}
/// <summary>
/// 4.4.20. URL-end state
/// </summary>
CssToken UrlEnd(Char current, CssTokenType type)
{
while (true)
{
if (current == Specification.RoundBracketClose)
{
return(CssStringToken.Url(type, FlushBuffer()));
}
else if (!current.IsSpaceCharacter())
{
RaiseErrorOccurred(ErrorCode.InvalidCharacter);
return(UrlBad(current, type));
}
current = _src.Next;
}
}
/// <summary>
/// 4.4.20. URL-end state
/// </summary>
CssToken UrlEnd(CssTokenType type)
{
while (true)
{
var current = GetNext();
if (current == Symbols.RoundBracketClose)
{
return(CssStringToken.Url(type, FlushBuffer()));
}
else if (!current.IsSpaceCharacter())
{
RaiseErrorOccurred(ErrorCode.InvalidCharacter);
Back();
return(UrlBad(type));
}
}
}
/// <summary>
/// 4.4.18. URL-double-quoted state
/// </summary>
CssToken UrlDQ(CssTokenType type)
{
while (true)
{
var current = GetNext();
if (current.IsLineBreak())
{
RaiseErrorOccurred(ErrorCode.LineBreakUnexpected);
return(UrlBad(type));
}
else if (Symbols.EndOfFile == current)
{
return(CssStringToken.Url(type, FlushBuffer()));
}
else if (current == Symbols.DoubleQuote)
{
return(UrlEnd(type));
}
else if (current == Symbols.ReverseSolidus)
{
current = GetNext();
if (current == Symbols.EndOfFile)
{
Back(2);
RaiseErrorOccurred(ErrorCode.EOF);
return(CssStringToken.Url(type, FlushBuffer(), true));
}
else if (current.IsLineBreak())
{
_stringBuffer.AppendLine();
}
else
{
_stringBuffer.Append(ConsumeEscape(current));
}
}
else
{
_stringBuffer.Append(current);
}
}
}
/// <summary>
/// 4.4.18. URL-double-quoted state
/// </summary>
CssToken UrlDQ(Char current, CssTokenType type)
{
while (true)
{
if (current.IsLineBreak())
{
RaiseErrorOccurred(ErrorCode.LineBreakUnexpected);
return(UrlBad(_src.Next, type));
}
else if (Specification.EndOfFile == current)
{
return(CssStringToken.Url(type, FlushBuffer()));
}
else if (current == Specification.DoubleQuote)
{
return(UrlEnd(_src.Next, type));
}
else if (current == Specification.ReverseSolidus)
{
current = _src.Next;
if (current == Specification.EndOfFile)
{
_src.Back(2);
RaiseErrorOccurred(ErrorCode.EOF);
return(CssStringToken.Url(type, 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(CssTokenType type)
{
while (true)
{
var current = GetNext();
if (current == Symbols.EndOfFile)
{
RaiseErrorOccurred(ErrorCode.EOF);
return(CssStringToken.Url(type, FlushBuffer(), true));
}
else if (current == Symbols.RoundBracketClose)
{
return(CssStringToken.Url(type, FlushBuffer(), true));
}
else if (IsValidEscape(current))
{
current = GetNext();
_stringBuffer.Append(ConsumeEscape(current));
}
}
}
/// <summary>
/// 4.4.22. Bad URL state
/// </summary>
CssToken UrlBad(Char current, CssTokenType type)
{
while (true)
{
if (current == Specification.EndOfFile)
{
RaiseErrorOccurred(ErrorCode.EOF);
return(CssStringToken.Url(type, FlushBuffer(), true));
}
else if (current == Specification.RoundBracketClose)
{
return(CssStringToken.Url(type, 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, CssTokenType type)
{
while (true)
{
if (current.IsSpaceCharacter())
{
return(UrlEnd(type));
}
else if (current == Symbols.RoundBracketClose || current == Symbols.EndOfFile)
{
return(CssStringToken.Url(type, FlushBuffer()));
}
else if (current == Symbols.DoubleQuote || current == Symbols.SingleQuote || current == Symbols.RoundBracketOpen || current.IsNonPrintable())
{
RaiseErrorOccurred(ErrorCode.InvalidCharacter);
return(UrlBad(type));
}
else if (current == Symbols.ReverseSolidus)
{
if (IsValidEscape(current))
{
current = GetNext();
_stringBuffer.Append(ConsumeEscape(current));
}
else
{
RaiseErrorOccurred(ErrorCode.InvalidCharacter);
return(UrlBad(type));
}
}
else
{
_stringBuffer.Append(current);
}
current = GetNext();
}
}
/// <summary>
/// 4.4.17. URL state
/// </summary>
CssToken UrlStart(CssTokenType type)
{
var current = SkipSpaces();
switch (current)
{
case Symbols.EndOfFile:
RaiseErrorOccurred(ErrorCode.EOF);
return(CssStringToken.Url(type, String.Empty, true));
case Symbols.DoubleQuote:
return(UrlDQ(type));
case Symbols.SingleQuote:
return(UrlSQ(type));
case ')':
return(CssStringToken.Url(type, String.Empty, false));
default:
return(UrlUQ(current, type));
}
}