/// <summary>
/// The text declaration for external DTDs.
/// </summary>
/// <param name="c">The character.</param>
/// <returns>The token.</returns>
protected DtdToken TextDecl(Char c)
{
if (_external)
{
var token = new DtdDeclToken();
if (c.IsSpaceCharacter())
{
c = SkipSpaces(c);
if (_stream.ContinuesWith(AttributeNames.Version))
{
_stream.Advance(6);
return(TextDeclVersion(_stream.Next, token));
}
else if (_stream.ContinuesWith(AttributeNames.Encoding))
{
_stream.Advance(7);
return(TextDeclEncoding(_stream.Next, token));
}
}
}
throw new DomException(DomError.InvalidNodeType);
}
/// <summary>
/// Gets the encoding specified in the text declaration.
/// </summary>
/// <param name="c">The character.</param>
/// <param name="decl">The current declaration.</param>
/// <returns>The token.</returns>
DtdToken TextDeclEncoding(Char c, DtdDeclToken decl)
{
if (c == Symbols.Equality)
{
var q = _stream.Next;
if (q == Symbols.DoubleQuote || q == Symbols.SingleQuote)
{
StringBuffer.Clear();
c = _stream.Next;
if (c.IsLetter())
{
do
{
StringBuffer.Append(c);
c = _stream.Next;
}while (c.IsAlphanumericAscii() || c == Symbols.Dot || c == Symbols.Underscore || c == Symbols.Minus);
}
if (c == q)
{
decl.Encoding = StringBuffer.ToString();
return(TextDeclAfter(_stream.Next, decl));
}
}
}
throw new DomException(DomError.InvalidNodeType);
}
/// <summary>
/// Gets the version specified in the text declaration.
/// </summary>
/// <param name="c">The character.</param>
/// <param name="decl">The current declaration.</param>
/// <returns>The token.</returns>
DtdToken TextDeclVersion(Char c, DtdDeclToken decl)
{
if (c == Symbols.Equality)
{
var q = _stream.Next;
if (q == Symbols.DoubleQuote || q == Symbols.SingleQuote)
{
StringBuffer.Clear();
c = _stream.Next;
while (c.IsDigit() || c == Symbols.Dot)
{
StringBuffer.Append(c);
c = _stream.Next;
}
if (c == q)
{
decl.Version = StringBuffer.ToString();
return(TextDeclBetween(_stream.Next, decl));
}
}
}
throw new DomException(DomError.InvalidNodeType);
}
/// <summary>
/// Checks if the text declaration ended correctly.
/// </summary>
/// <param name="c">The character.</param>
/// <param name="decl">The current declaration.</param>
/// <returns>The token.</returns>
DtdToken TextDeclEnd(Char c, DtdDeclToken decl)
{
if (c != Symbols.GreaterThan)
{
throw new DomException(DomError.InvalidNodeType);
}
return(decl);
}
/// <summary>
/// After the declaration specified in the text declaration.
/// </summary>
/// <param name="c">The character.</param>
/// <param name="decl">The current declaration.</param>
/// <returns>The token.</returns>
DtdToken TextDeclAfter(Char c, DtdDeclToken decl)
{
while (c.IsSpaceCharacter())
{
c = _stream.Next;
}
if (c != Symbols.QuestionMark)
{
throw new DomException(DomError.InvalidNodeType);
}
return(TextDeclEnd(_stream.Next, decl));
}
/// <summary>
/// Between the version and the encoding in the text declaration.
/// </summary>
/// <param name="c">The character.</param>
/// <param name="decl">The current declaration.</param>
/// <returns>The token.</returns>
DtdToken TextDeclBetween(Char c, DtdDeclToken decl)
{
if (c.IsSpaceCharacter())
{
while (c.IsSpaceCharacter())
{
c = _stream.Next;
}
if (_stream.ContinuesWith(AttributeNames.Encoding))
{
_stream.Advance(7);
return(TextDeclEncoding(_stream.Next, decl));
}
}
throw new DomException(DomError.InvalidNodeType);
}
