/// <summary>
/// 4.4.3. Single quoted string state
/// </summary>
CssToken StringSQ(Char current)
{
while (true)
{
switch (current)
{
case Specification.SingleQuote:
case Specification.EndOfFile:
return CssStringToken.Plain(FlushBuffer());
case Specification.FormFeed:
case Specification.LineFeed:
RaiseErrorOccurred(ErrorCode.LineBreakUnexpected);
Back();
return (CssStringToken.Plain(FlushBuffer(), true));
case Specification.ReverseSolidus:
current = Next;
if (current.IsLineBreak())
_stringBuffer.AppendLine();
else if (current != Specification.EndOfFile)
_stringBuffer.Append(ConsumeEscape(current));
else
{
RaiseErrorOccurred(ErrorCode.EOF);
Back();
return(CssStringToken.Plain(FlushBuffer(), true));
}
break;
default:
_stringBuffer.Append(current);
break;
}
current = Next;
}
}
/// <summary>
/// 4.4.1. Data state
/// </summary>
CssToken Data(Char current)
{
switch (current)
{
case Specification.LineFeed:
case Specification.CarriageReturn:
case Specification.Tab:
case Specification.Space:
do { current = Next; }
while (current.IsSpaceCharacter());
if (_ignoreWs)
return Data(current);
Back();
return CssSpecialCharacter.Whitespace;
case Specification.DoubleQuote:
return StringDQ(Next);
case Specification.Num:
return HashStart(Next);
case Specification.Dollar:
current = Next;
if (current == Specification.Equality)
return CssMatchToken.Suffix;
return CssToken.Delim(Previous);
case Specification.SingleQuote:
return StringSQ(Next);
case Specification.RoundBracketOpen:
return CssBracketToken.OpenRound;
case Specification.RoundBracketClose:
return CssBracketToken.CloseRound;
case Specification.Asterisk:
current = Next;
if (current == Specification.Equality)
return CssMatchToken.Substring;
return CssToken.Delim(Previous);
case Specification.Plus:
{
var c1 = Next;
if (c1 == Specification.EndOfFile)
{
Back();
}
else
{
var c2 = Next;
Back(2);
if (c1.IsDigit() || (c1 == Specification.Dot && c2.IsDigit()))
return NumberStart(current);
}
return CssToken.Delim(current);
}
case Specification.Comma:
return CssSpecialCharacter.Comma;
case Specification.Dot:
{
var c = Next;
if (c.IsDigit())
return NumberStart(Previous);
return CssToken.Delim(Previous);
}
case Specification.Minus:
{
var c1 = Next;
if (c1 == Specification.EndOfFile)
{
Back();
}
else
{
var c2 = Next;
Back(2);
if (c1.IsDigit() || (c1 == Specification.Dot && c2.IsDigit()))
return NumberStart(current);
else if (c1.IsNameStart())
return IdentStart(current);
else if (c1 == Specification.ReverseSolidus && !c2.IsLineBreak() && c2 != Specification.EndOfFile)
return IdentStart(current);
else if (c1 == Specification.Minus && c2 == Specification.GreaterThan)
{
Advance(2);
if (_ignoreCs)
return Data(Next);
return CssCommentToken.Close;
}
}
return CssToken.Delim(current);
}
case Specification.Solidus:
current = Next;
if (current == Specification.Asterisk)
return Comment(Next);
return CssToken.Delim(Previous);
case Specification.ReverseSolidus:
current = Next;
if (current.IsLineBreak() || current == Specification.EndOfFile)
{
RaiseErrorOccurred(current == Specification.EndOfFile ? ErrorCode.EOF : ErrorCode.LineBreakUnexpected);
return CssToken.Delim(Previous);
}
return IdentStart(Previous);
case Specification.Colon:
return CssSpecialCharacter.Colon;
case Specification.Semicolon:
return CssSpecialCharacter.Semicolon;
case Specification.LessThan:
current = Next;
if (current == Specification.ExclamationMark)
{
current = Next;
if (current == Specification.Minus)
{
current = Next;
if (current == Specification.Minus)
{
if (_ignoreCs)
return Data(Next);
return CssCommentToken.Open;
}
current = Previous;
}
current = Previous;
}
return CssToken.Delim(Previous);
case Specification.At:
return AtKeywordStart(Next);
case Specification.SquareBracketOpen:
return CssBracketToken.OpenSquare;
case Specification.SquareBracketClose:
return CssBracketToken.CloseSquare;
case Specification.Accent:
current = Next;
if (current == Specification.Equality)
return CssMatchToken.Prefix;
return CssToken.Delim(Previous);
case Specification.CurlyBracketOpen:
return CssBracketToken.OpenCurly;
case Specification.CurlyBracketClose:
return CssBracketToken.CloseCurly;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
return NumberStart(current);
case 'U':
case 'u':
current = Next;
if (current == Specification.Plus)
{
current = Next;
if (current.IsHex() || current == Specification.QuestionMark)
return UnicodeRange(current);
current = Previous;
}
return IdentStart(Previous);
case Specification.Pipe:
current = Next;
if (current == Specification.Equality)
return CssMatchToken.Dash;
else if (current == Specification.Pipe)
return CssToken.Column;
return CssToken.Delim(Previous);
case Specification.Tilde:
current = Next;
if (current == Specification.Equality)
return CssMatchToken.Include;
return CssToken.Delim(Previous);
case Specification.EndOfFile:
return null;
case Specification.ExclamationMark:
current = Next;
if (current == Specification.Equality)
return CssMatchToken.Not;
return CssToken.Delim(Previous);
default:
if (current.IsNameStart())
return IdentStart(current);
return CssToken.Delim(current);
}
}
/// <summary>
/// Checks if the current position is the beginning of a valid escape sequence.
/// </summary>
/// <returns>The result of the check.</returns>
Boolean IsValidEscape(Char current)
{
if (current != Specification.ReverseSolidus)
return false;
current = Next;
Back();
if (current == Specification.EndOfFile)
return false;
else if (current.IsLineBreak())
return false;
return true;
}
/// <summary>
/// Just goes back one character without checking
/// if the beginning is already reached.
/// </summary>
void BackUnsafe()
{
_source.Index -= 1;
if (_source.Index == 0)
{
_column = 0;
_current = Symbols.Null;
return;
}
_current = _source[_source.Index - 1];
if (_current == Symbols.CarriageReturn)
{
BackUnsafe();
return;
}
if (_current.IsLineBreak())
{
_column = _columns.Count != 0 ? _columns.Pop() : (UInt16)1;
_row--;
}
else
{
_column--;
}
}
/// <summary>
/// 4.4.19. URL-single-quoted state
/// </summary>
CssToken UrlSQ(Char current, CssTokenType type)
{
while (true)
{
if (current.IsLineBreak())
{
RaiseErrorOccurred(ErrorCode.LineBreakUnexpected);
return UrlBad(Next, type);
}
else if (Specification.EndOfFile == current)
{
return CssStringToken.Url(type, FlushBuffer());
}
else if (current == Specification.SingleQuote)
{
return UrlEnd(Next, type);
}
else if (current == Specification.ReverseSolidus)
{
current = Next;
if (current == Specification.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);
current = Next;
}
}
/// <summary>
/// Checks if the current position is the beginning of a valid escape sequence.
/// </summary>
/// <returns>The result of the check.</returns>
Boolean IsValidEscape(Char current)
{
if (current != Symbols.ReverseSolidus)
return false;
current = GetNext();
Back();
if (current == Symbols.EndOfFile)
return false;
else if (current.IsLineBreak())
return false;
return true;
}
/// <summary>
/// 4.4.1. Data state
/// </summary>
CssToken Data(Char current)
{
_position = GetCurrentPosition();
switch (current)
{
case Symbols.FormFeed:
case Symbols.LineFeed:
case Symbols.CarriageReturn:
case Symbols.Tab:
case Symbols.Space:
return NewWhitespace(current);
case Symbols.DoubleQuote:
return StringDQ();
case Symbols.Num:
return _valueMode ? ColorLiteral() : HashStart();
case Symbols.Dollar:
current = GetNext();
if (current == Symbols.Equality)
return NewSuffix();
return NewDelimiter(GetPrevious());
case Symbols.SingleQuote:
return StringSQ();
case Symbols.RoundBracketOpen:
return NewOpenRound();
case Symbols.RoundBracketClose:
return NewCloseRound();
case Symbols.Asterisk:
current = GetNext();
if (current == Symbols.Equality)
return NewSubstring();
return NewDelimiter(GetPrevious());
case Symbols.Plus:
{
var c1 = GetNext();
if (c1 != Symbols.EndOfFile)
{
var c2 = GetNext();
Back(2);
if (c1.IsDigit() || (c1 == Symbols.Dot && c2.IsDigit()))
return NumberStart(current);
}
else
Back();
return NewDelimiter(current);
}
case Symbols.Comma:
return NewComma();
case Symbols.Dot:
{
var c = GetNext();
if (c.IsDigit())
return NumberStart(GetPrevious());
return NewDelimiter(GetPrevious());
}
case Symbols.Minus:
{
var c1 = GetNext();
if (c1 != Symbols.EndOfFile)
{
var c2 = GetNext();
Back(2);
if (c1.IsDigit() || (c1 == Symbols.Dot && c2.IsDigit()))
return NumberStart(current);
else if (c1.IsNameStart())
return IdentStart(current);
else if (c1 == Symbols.ReverseSolidus && !c2.IsLineBreak() && c2 != Symbols.EndOfFile)
return IdentStart(current);
else if (c1 == Symbols.Minus && c2 == Symbols.GreaterThan)
{
Advance(2);
return NewCloseComment();
}
}
else
Back();
return NewDelimiter(current);
}
case Symbols.Solidus:
current = GetNext();
if (current == Symbols.Asterisk)
return Comment();
return NewDelimiter(GetPrevious());
case Symbols.ReverseSolidus:
current = GetNext();
if (current.IsLineBreak())
{
RaiseErrorOccurred(CssParseError.LineBreakUnexpected);
return NewDelimiter(GetPrevious());
}
else if (current == Symbols.EndOfFile)
{
RaiseErrorOccurred(CssParseError.EOF);
return NewDelimiter(GetPrevious());
}
return IdentStart(GetPrevious());
case Symbols.Colon:
return NewColon();
case Symbols.Semicolon:
return NewSemicolon();
case Symbols.LessThan:
current = GetNext();
if (current == Symbols.ExclamationMark)
{
current = GetNext();
if (current == Symbols.Minus)
{
current = GetNext();
if (current == Symbols.Minus)
return NewOpenComment();
current = GetPrevious();
}
current = GetPrevious();
}
return NewDelimiter(GetPrevious());
case Symbols.At:
return AtKeywordStart();
case Symbols.SquareBracketOpen:
return NewOpenSquare();
case Symbols.SquareBracketClose:
return NewCloseSquare();
case Symbols.Accent:
current = GetNext();
if (current == Symbols.Equality)
return NewPrefix();
return NewDelimiter(GetPrevious());
case Symbols.CurlyBracketOpen:
return NewOpenCurly();
case Symbols.CurlyBracketClose:
return NewCloseCurly();
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
return NumberStart(current);
case 'U':
case 'u':
current = GetNext();
if (current == Symbols.Plus)
{
current = GetNext();
if (current.IsHex() || current == Symbols.QuestionMark)
return UnicodeRange(current);
current = GetPrevious();
}
return IdentStart(GetPrevious());
case Symbols.Pipe:
current = GetNext();
if (current == Symbols.Equality)
return NewDash();
else if (current == Symbols.Pipe)
return NewColumn();
return NewDelimiter(GetPrevious());
case Symbols.Tilde:
current = GetNext();
if (current == Symbols.Equality)
return NewInclude();
return NewDelimiter(GetPrevious());
case Symbols.EndOfFile:
return NewEof();
case Symbols.ExclamationMark:
current = GetNext();
if (current == Symbols.Equality)
return NewNot();
return NewDelimiter(GetPrevious());
default:
if (current.IsNameStart())
return IdentStart(current);
return NewDelimiter(current);
}
}
/// <summary>
/// 4.4.3. Single quoted string state
/// </summary>
CssToken StringSQ(Char current)
{
while (true)
{
switch (current)
{
case Specification.SQ:
case Specification.EOF:
return CssStringToken.Plain(FlushBuffer());
case Specification.FF:
case Specification.LF:
RaiseErrorOccurred(ErrorCode.LineBreakUnexpected);
_src.Back();
return (CssStringToken.Plain(FlushBuffer(), true));
case Specification.RSOLIDUS:
current = _src.Next;
if (current.IsLineBreak())
_stringBuffer.AppendLine();
else if (current != Specification.EOF)
_stringBuffer.Append(ConsumeEscape(current));
else
{
RaiseErrorOccurred(ErrorCode.EOF);
_src.Back();
return(CssStringToken.Plain(FlushBuffer(), true));
}
break;
default:
_stringBuffer.Append(current);
break;
}
current = _src.Next;
}
}
/// <summary>
/// Just goes back one character without checking
/// if the beginning is already reached.
/// </summary>
void BackUnsafe()
{
_reader.Index -= 1;
if (_reader.Index == 0)
{
_column = 0;
_current = Specification.Null;
return;
}
_current = _reader[_reader.Index - 1];
if (_current.IsLineBreak())
{
_column = _collengths.Count != 0 ? _collengths.Pop() : 1;
_row--;
}
else
_column--;
}
/// <summary>
/// Checks if the current position is the beginning of a valid escape sequence.
/// </summary>
/// <returns>The result of the check.</returns>
Boolean IsValidEscape(Char current)
{
if (current != Specification.RSOLIDUS)
return false;
current = _src.Next;
_src.Back();
if (current == Specification.EOF)
return false;
else if (current.IsLineBreak())
return false;
return true;
}
/// <summary>
/// 4.4.1. Data state
/// </summary>
CssToken Data(Char current)
{
switch (current)
{
case Specification.LF:
case Specification.CR:
case Specification.TAB:
case Specification.SPACE:
do { current = _src.Next; }
while (current.IsSpaceCharacter());
if (_ignoreWs)
return Data(current);
_src.Back();
return CssSpecialCharacter.Whitespace;
case Specification.DQ:
return StringDQ(_src.Next);
case Specification.NUM:
return HashStart(_src.Next);
case Specification.DOLLAR:
current = _src.Next;
if (current == Specification.EQ)
return CssMatchToken.Suffix;
return CssToken.Delim(_src.Previous);
case Specification.SQ:
return StringSQ(_src.Next);
case Specification.RBO:
return CssBracketToken.OpenRound;
case Specification.RBC:
return CssBracketToken.CloseRound;
case Specification.ASTERISK:
current = _src.Next;
if (current == Specification.EQ)
return CssMatchToken.Substring;
return CssToken.Delim(_src.Previous);
case Specification.PLUS:
{
var c1 = _src.Next;
if (c1 == Specification.EOF)
{
_src.Back();
}
else
{
var c2 = _src.Next;
_src.Back(2);
if (c1.IsDigit() || (c1 == Specification.DOT && c2.IsDigit()))
return NumberStart(current);
}
return CssToken.Delim(current);
}
case Specification.COMMA:
return CssSpecialCharacter.Comma;
case Specification.DOT:
{
var c = _src.Next;
if (c.IsDigit())
return NumberStart(_src.Previous);
return CssToken.Delim(_src.Previous);
}
case Specification.MINUS:
{
var c1 = _src.Next;
if (c1 == Specification.EOF)
{
_src.Back();
}
else
{
var c2 = _src.Next;
_src.Back(2);
if (c1.IsDigit() || (c1 == Specification.DOT && c2.IsDigit()))
return NumberStart(current);
else if (c1.IsNameStart())
return IdentStart(current);
else if (c1 == Specification.RSOLIDUS && !c2.IsLineBreak() && c2 != Specification.EOF)
return IdentStart(current);
else if (c1 == Specification.MINUS && c2 == Specification.GT)
{
_src.Advance(2);
if (_ignoreCs)
return Data(_src.Next);
return CssCommentToken.Close;
}
}
return CssToken.Delim(current);
}
case Specification.SOLIDUS:
current = _src.Next;
if (current == Specification.ASTERISK)
return Comment(_src.Next);
return CssToken.Delim(_src.Previous);
case Specification.RSOLIDUS:
current = _src.Next;
if (current.IsLineBreak() || current == Specification.EOF)
{
RaiseErrorOccurred(current == Specification.EOF ? ErrorCode.EOF : ErrorCode.LineBreakUnexpected);
return CssToken.Delim(_src.Previous);
}
return IdentStart(_src.Previous);
case Specification.COLON:
return CssSpecialCharacter.Colon;
case Specification.SC:
return CssSpecialCharacter.Semicolon;
case Specification.LT:
current = _src.Next;
if (current == Specification.EM)
{
current = _src.Next;
if (current == Specification.MINUS)
{
current = _src.Next;
if (current == Specification.MINUS)
{
if (_ignoreCs)
return Data(_src.Next);
return CssCommentToken.Open;
}
current = _src.Previous;
}
current = _src.Previous;
}
return CssToken.Delim(_src.Previous);
case Specification.AT:
return AtKeywordStart(_src.Next);
case Specification.SBO:
return CssBracketToken.OpenSquare;
case Specification.SBC:
return CssBracketToken.CloseSquare;
case Specification.ACCENT:
current = _src.Next;
if (current == Specification.EQ)
return CssMatchToken.Prefix;
return CssToken.Delim(_src.Previous);
case Specification.CBO:
return CssBracketToken.OpenCurly;
case Specification.CBC:
return CssBracketToken.CloseCurly;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
return NumberStart(current);
case 'U':
case 'u':
current = _src.Next;
if (current == Specification.PLUS)
{
current = _src.Next;
if (current.IsHex() || current == Specification.QM)
return UnicodeRange(current);
current = _src.Previous;
}
return IdentStart(_src.Previous);
case Specification.PIPE:
current = _src.Next;
if (current == Specification.EQ)
return CssMatchToken.Dash;
else if (current == Specification.PIPE)
return CssToken.Column;
return CssToken.Delim(_src.Previous);
case Specification.TILDE:
current = _src.Next;
if (current == Specification.EQ)
return CssMatchToken.Include;
return CssToken.Delim(_src.Previous);
case Specification.EOF:
return null;
case Specification.EM:
current = _src.Next;
if (current == Specification.EQ)
return CssMatchToken.Not;
return CssToken.Delim(_src.Previous);
default:
if (current.IsNameStart())
return IdentStart(current);
return CssToken.Delim(current);
}
}
/// <summary>
/// 4.4.19. URL-single-quoted state
/// </summary>
CssToken UrlSQ(Char current, CssTokenType type)
{
while (true)
{
if (current.IsLineBreak())
{
RaiseErrorOccurred(ErrorCode.LineBreakUnexpected);
return UrlBad(_src.Next, type);
}
else if (Specification.EOF == current)
{
return CssStringToken.Url(type, FlushBuffer());
}
else if (current == Specification.SQ)
{
return UrlEnd(_src.Next, type);
}
else if (current == Specification.RSOLIDUS)
{
current = _src.Next;
if (current == Specification.EOF)
{
_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;
}
}
void BackUnsafe()
{
_insertion--;
if (_insertion == 0)
{
_column = 0;
_current = Specification.NULL;
return;
}
_current = _buffer[_insertion - 1];
if (_current.IsLineBreak())
{
_column = _collengths.Count != 0 ? _collengths.Pop() : 1;
_row--;
}
else
_column--;
}
Boolean IsValidEscape(Char current)
{
if (current == Symbols.ReverseSolidus)
{
current = GetNext();
Back();
return current != Symbols.EndOfFile && !current.IsLineBreak();
}
return false;
}
