/// <summary>
/// Advances by one character.
/// </summary>
public void Advance()
{
if (_texts.Count != 0)
{
_pos.Push(_pos.Pop() + 1);
if (_pos.Peek() == _texts.Peek().Length)
{
_pos.Pop();
_texts.Pop();
_params.Pop();
}
}
else
{
_base.Advance();
}
}
/// <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 (Specification.IsSpaceCharacter(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 '(':
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 (Specification.IsDigit(c1) || (c1 == Specification.FS && Specification.IsDigit(c2)))
{
return(NumberStart(current));
}
}
return(CssToken.Delim(current));
}
case Specification.COMMA:
return(CssSpecialCharacter.Comma);
case Specification.FS:
{
var c = src.Next;
if (Specification.IsDigit(c))
{
return(NumberStart(src.Previous));
}
return(CssToken.Delim(src.Previous));
}
case Specification.DASH:
{
var c1 = src.Next;
if (c1 == Specification.EOF)
{
src.Back();
}
else
{
var c2 = src.Next;
src.Back(2);
if (Specification.IsDigit(c1) || (c1 == Specification.FS && Specification.IsDigit(c2)))
{
return(NumberStart(current));
}
else if (Specification.IsNameStart(c1))
{
return(IdentStart(current));
}
else if (c1 == Specification.RSOLIDUS && !Specification.IsLineBreak(c2) && c2 != Specification.EOF)
{
return(IdentStart(current));
}
else if (c1 == Specification.DASH && 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 (Specification.IsLineBreak(current) || current == Specification.EOF)
{
RaiseErrorOccurred(current == Specification.EOF ? ErrorCode.EOF : ErrorCode.LineBreakUnexpected);
return(CssToken.Delim(src.Previous));
}
return(IdentStart(src.Previous));
case Specification.COL:
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.DASH)
{
current = src.Next;
if (current == Specification.DASH)
{
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.CA:
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 (Specification.IsHex(current) || 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 (Specification.IsNameStart(current))
{
return(IdentStart(current));
}
return(CssToken.Delim(current));
}
}