/// <summary>
/// 4.4.7. At-keyword state
/// </summary>
CssToken AtKeywordStart(Char current)
{
if (current == Specification.MINUS)
{
current = src.Next;
if (current.IsNameStart() || IsValidEscape(current))
{
stringBuffer.Append(Specification.MINUS);
return(AtKeywordRest(current));
}
src.Back(2);
return(CssToken.Delim(Specification.AT));
}
else if (current.IsNameStart())
{
stringBuffer.Append(current);
return(AtKeywordRest(src.Next));
}
else if (IsValidEscape(current))
{
current = src.Next;
stringBuffer.Append(ConsumeEscape(current));
return(AtKeywordRest(src.Next));
}
else
{
src.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>
/// 4.4.4. 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));
}
}
/// <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());
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 '(':
return(CssBracketToken.OpenRound);
case ')':
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);
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)
{
return(CssCommentToken.Open);
}
current = src.Previous;
}
current = src.Previous;
}
return(CssToken.Delim(src.Previous));
case Specification.AT:
return(AtKeywordStart(src.Next));
case '[':
return(CssBracketToken.OpenSquare);
case ']':
return(CssBracketToken.CloseSquare);
case Specification.ACCENT:
current = src.Next;
if (current == Specification.EQ)
{
return(CssMatchToken.Prefix);
}
return(CssToken.Delim(src.Previous));
case '{':
return(CssBracketToken.OpenCurly);
case '}':
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));
}
}
