/// <summary>
/// Parses attributes from the tag using the given
/// <see cref="ITextParser"/> <paramref name="tp"/>. The
/// <see cref="ITextParser"/> position should be set to
/// the first character of the tag following the element name.
/// </summary>
private bool ParseAttributes(ITextParser tp)
{
const char kDoubleQuote = '"';
const char kSingleQuote = '\'';
const string kDoubleQuoteEntity = "";
if (tp.Peek() == '>')
{
tp.MoveAhead();
return(true);
}
var sb = new StringBuilder();
// Copy current input character
void Copy()
{
sb.Append(tp.Peek());
tp.MoveAhead();
}
// Copy input characters until fence character or end of tag
void CopyTo(char fence)
{
while (!tp.EndOfText)
{
var c = tp.Peek();
if (c == fence || c == '>')
{
break;
}
if (c != kDoubleQuote)
{
sb.Append(c);
}
else
{
sb.Append(kDoubleQuoteEntity);
}
tp.MoveAhead();
}
}
// Copy attributes
var startPos = tp.Position;
while (!tp.EndOfText)
{
var c = tp.Peek();
if (c == '>' || c == '<')
{
break;
}
switch (c)
{
case '=':
Copy();
c = tp.Peek();
if (c == kDoubleQuote)
{
// Copy double-quoted value
Copy();
CopyTo(kDoubleQuote);
sb.Append(kDoubleQuote);
tp.MoveAhead();
}
else if (c == kSingleQuote)
{
// Copy single-quoted value, but with double-quotes
sb.Append(kDoubleQuote);
tp.MoveAhead();
CopyTo(kSingleQuote);
sb.Append(kDoubleQuote);
tp.MoveAhead();
}
else
{
// Copy unqouted value adding double-quotes
sb.Append(kDoubleQuote);
CopyTo(' ');
sb.Append(kDoubleQuote);
}
break;
default:
Copy();
break;
}
}
if (tp.Peek() != '>')
{
return(false);
}
if (tp.CharAt(tp.Position - 1) == '/')
{
IsSelfClosingTag = true;
sb.Length = sb.Length - 1;
}
AttributesPart = sb.ToString();
if (AttributesPart.IndexOf('&') != -1)
{
AttributesPart = ResolveEntities(AttributesPart);
}
tp.MoveAhead();
return(true);
}