/// <summary>
/// 4.4.13. Number-rest state
/// </summary>
CssToken NumberRest(Char current)
{
while (true)
{
if (current.IsDigit())
_stringBuffer.Append(current);
else if (current.IsNameStart())
{
var number = FlushBuffer();
_stringBuffer.Append(current);
return Dimension(Next, number);
}
else if (IsValidEscape(current))
{
current = Next;
var number = FlushBuffer();
_stringBuffer.Append(ConsumeEscape(current));
return Dimension(Next, number);
}
else
break;
current = Next;
}
switch (current)
{
case Specification.Dot:
current = Next;
if (current.IsDigit())
{
_stringBuffer.Append(Specification.Dot).Append(current);
return NumberFraction(Next);
}
Back();
return CssToken.Number(FlushBuffer());
case '%':
return CssUnitToken.Percentage(FlushBuffer());
case 'e':
case 'E':
return NumberExponential(current);
case Specification.Minus:
return NumberDash(current);
default:
Back();
return CssToken.Number(FlushBuffer());
}
}
/// <summary>
/// 4.4.9. Ident state
/// </summary>
CssToken IdentStart(Char current)
{
if (current == Specification.Minus)
{
current = Next;
if (current.IsNameStart() || IsValidEscape(current))
{
_stringBuffer.Append(Specification.Minus);
return IdentRest(current);
}
Back();
return CssToken.Delim(Specification.Minus);
}
else if (current.IsNameStart())
{
_stringBuffer.Append(current);
return IdentRest(Next);
}
else if (current == Specification.ReverseSolidus)
{
if (IsValidEscape(current))
{
current = Next;
_stringBuffer.Append(ConsumeEscape(current));
return IdentRest(Next);
}
}
return Data(current);
}
/// <summary>
/// Substate of several Number states.
/// </summary>
CssToken NumberDash(Char current)
{
current = Next;
if (current.IsNameStart())
{
var number = FlushBuffer();
_stringBuffer.Append(Specification.Minus).Append(current);
return Dimension(Next, number);
}
else if (IsValidEscape(current))
{
current = Next;
var number = FlushBuffer();
_stringBuffer.Append(Specification.Minus).Append(ConsumeEscape(current));
return Dimension(Next, number);
}
else
{
Back(2);
return CssToken.Number(FlushBuffer());
}
}
/// <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>
/// 4.4.4. Hash state
/// </summary>
CssToken HashStart(Char current)
{
if (current.IsNameStart())
{
_stringBuffer.Append(current);
return HashRest(Next);
}
else if (IsValidEscape(current))
{
current = Next;
_stringBuffer.Append(ConsumeEscape(current));
return HashRest(Next);
}
else if (current == Specification.ReverseSolidus)
{
RaiseErrorOccurred(ErrorCode.InvalidCharacter);
Back();
return CssToken.Delim(Specification.Num);
}
else
{
Back();
return CssToken.Delim(Specification.Num);
}
}
/// <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>
/// 4.4.7. At-keyword state
/// </summary>
CssToken AtKeywordStart(Char current)
{
if (current == Specification.Minus)
{
current = Next;
if (current.IsNameStart() || IsValidEscape(current))
{
_stringBuffer.Append(Specification.Minus);
return AtKeywordRest(current);
}
Back(2);
return CssToken.Delim(Specification.At);
}
else if (current.IsNameStart())
{
_stringBuffer.Append(current);
return AtKeywordRest(Next);
}
else if (IsValidEscape(current))
{
current = Next;
_stringBuffer.Append(ConsumeEscape(current));
return AtKeywordRest(Next);
}
else
{
Back();
return CssToken.Delim(Specification.At);
}
}
/// <summary>
/// 4.4.9. Ident state
/// </summary>
CssToken IdentStart(Char current)
{
if (current == Specification.MINUS)
{
current = _src.Next;
if (current.IsNameStart() || IsValidEscape(current))
{
_stringBuffer.Append(Specification.MINUS);
return IdentRest(current);
}
_src.Back();
return CssToken.Delim(Specification.MINUS);
}
else if (current.IsNameStart())
{
_stringBuffer.Append(current);
return IdentRest(_src.Next);
}
else if (current == Specification.RSOLIDUS)
{
if (IsValidEscape(current))
{
current = _src.Next;
_stringBuffer.Append(ConsumeEscape(current));
return IdentRest(_src.Next);
}
}
return Data(current);
}
/// <summary>
/// 4.4.9. Ident state
/// </summary>
CssToken IdentStart(Char current)
{
if (current == Symbols.Minus)
{
current = GetNext();
if (current.IsNameStart() || IsValidEscape(current))
{
_stringBuffer.Append(Symbols.Minus);
return IdentRest(current);
}
Back();
return NewDelimiter(Symbols.Minus);
}
else if (current.IsNameStart())
{
_stringBuffer.Append(current);
return IdentRest(GetNext());
}
else if (current == Symbols.ReverseSolidus)
{
if (IsValidEscape(current))
{
current = GetNext();
_stringBuffer.Append(ConsumeEscape(current));
return IdentRest(GetNext());
}
}
return Data(current);
}
/// <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>
/// 4.4.4. Hash state
/// </summary>
CssToken HashStart(Char current)
{
if (current.IsNameStart())
{
_stringBuffer.Append(current);
return HashRest(_src.Next);
}
else if (IsValidEscape(current))
{
current = _src.Next;
_stringBuffer.Append(ConsumeEscape(current));
return HashRest(_src.Next);
}
else if (current == Specification.RSOLIDUS)
{
RaiseErrorOccurred(ErrorCode.InvalidCharacter);
_src.Back();
return CssToken.Delim(Specification.NUM);
}
else
{
_src.Back();
return CssToken.Delim(Specification.NUM);
}
}
ElementDeclarationEntry TypeDeclarationChildren(Char c)
{
var entries = new List<ElementDeclarationEntry>();
var connection = Specification.NULL;
while (true)
{
if (entries.Count > 0)
{
if (c != Specification.PIPE && c != Specification.COMMA)
throw new ArgumentException("Invalid content specification in element type declaration.");
if (entries.Count == 1)
connection = c;
else if (connection != c)
throw new ArgumentException("Invalid content specification in element type declaration.");
c = _src.Next;
}
while (c.IsSpaceCharacter())
c = _src.Next;
if (c.IsNameStart())
{
var name = TypeDeclarationName(c);
entries.Add(name);
}
else if (c == Specification.RBO)
entries.Add(TypeDeclarationChildren(_src.Next));
else
throw new ArgumentException("Invalid content specification in element type declaration.");
c = _src.Current;
while (c.IsSpaceCharacter())
c = _src.Next;
if (c == Specification.RBC)
break;
}
c = _src.Next;
if (entries.Count == 1)
return entries[0];
else if (entries.Count == 0)
throw new ArgumentException("Invalid content specification in element type declaration.");
else if (connection == Specification.COMMA)
{
var sequence = new ElementSequenceDeclarationEntry();
sequence.Sequence.AddRange(entries);
sequence.Quantifier = TypeDeclarationQuantifier(c);
return sequence;
}
var choice = new ElementChoiceDeclarationEntry();
choice.Choice.AddRange(entries);
choice.Quantifier = TypeDeclarationQuantifier(c);
return choice;
}
/// <summary>
/// More http://www.w3.org/TR/REC-xml/#attdecls.
/// </summary>
/// <param name="c">The next input character.</param>
DtdAttributeToken AttributeDeclaration(Char c)
{
var decl = new DtdAttributeToken();
var canContinue = false;
if (c.IsSpaceCharacter())
canContinue = DeclarationNameBefore(_src.Next, decl);
else if (c == Specification.EOF)
throw new ArgumentException("The document ended unexpectedly.");
else
{
RaiseErrorOccurred(ErrorCode.UndefinedMarkupDeclaration);
canContinue = DeclarationNameBefore(c, decl);
}
c = _src.Current;
if (canContinue)
{
while (true)
{
while (c.IsSpaceCharacter())
c = _src.Next;
if (c.IsNameStart())
{
_stringBuffer.Clear();
decl.Attributes.Add(AttributeDeclarationName(c));
c = _src.Current;
continue;
}
break;
}
}
return AttributeDeclarationAfter(c, decl);
}
DtdToken EntityDeclarationAfter(Char c, DtdEntityToken decl)
{
while (c.IsSpaceCharacter())
c = _src.Next;
if (c == Specification.EOF)
throw new ArgumentException("The document ended unexpectedly.");
else if (c == Specification.GT)
return decl;
else if (decl.IsExtern && String.IsNullOrEmpty(decl.ExternNotation))
{
if (_src.ContinuesWith("NDATA"))
{
_src.Advance(4);
c = _src.Next;
while (c.IsSpaceCharacter())
c = _src.Next;
if (c.IsNameStart())
{
_stringBuffer.Clear();
do
{
_stringBuffer.Append(c);
c = _src.Next;
}
while (c.IsName());
decl.ExternNotation = _stringBuffer.ToString();
return EntityDeclarationAfter(c, decl);
}
}
}
throw new ArgumentException("Declaration invalid.");
}
ElementMixedDeclarationEntry TypeDeclarationMixed(Char c)
{
var entry = new ElementMixedDeclarationEntry();
while (true)
{
while (c.IsSpaceCharacter())
c = _src.Next;
if (c == Specification.RBC)
{
c = _src.Next;
if (c == Specification.ASTERISK)
{
entry.Quantifier = ElementDeclarationEntry.ElementQuantifier.ZeroOrMore;
_src.Advance();
return entry;
}
if (entry.Names.Count > 0)
RaiseErrorOccurred(ErrorCode.QuantifierMissing);
break;
}
else if (c == Specification.PIPE)
{
c = _src.Next;
while (c.IsSpaceCharacter())
c = _src.Next;
_stringBuffer.Clear();
if (c.IsNameStart())
{
_stringBuffer.Append(c);
while ((c = _src.Next).IsName())
_stringBuffer.Append(c);
entry.Names.Add(_stringBuffer.ToString());
}
else
throw new ArgumentException("Invalid content specification in element type declaration.");
}
}
return entry;
}
XmlEntityToken CharacterReference(Char c)
{
_stringBuffer.Clear();
if (c == Specification.NUM)
{
c = _src.Next;
while (c.IsHex())
{
_stringBuffer.Append(c);
c = _src.Next;
}
if (_stringBuffer.Length > 0 && c == Specification.SC)
return new XmlEntityToken { Value = _stringBuffer.ToString(), IsNumeric = true };
}
else if (c.IsNameStart())
{
do
{
_stringBuffer.Append(c);
c = _src.Next;
}
while (c.IsName());
if (c == Specification.SC)
return new XmlEntityToken { Value = _stringBuffer.ToString() };
}
throw new ArgumentException("Invalid entity reference.");
}