static string Read(StringBuffer reader, Func <char, bool> criteria)
{
var buffer = new StringBuilder();
while (!reader.Eof)
{
var current = reader.Peek();
if (!criteria(current))
{
break;
}
buffer.Append(reader.Read());
}
return(buffer.ToString());
}
public bool MoveNext()
{
if (_reader.Eof)
{
return(false);
}
var current = _reader.Peek();
if (current == '[')
{
var position = _reader.Position;
_reader.Read();
if (_reader.Eof)
{
throw new InvalidOperationException($"Encountered malformed markup tag at position {_reader.Position}.");
}
current = _reader.Peek();
if (current == '[')
{
_reader.Read();
Current = new MarkupToken(MarkupTokenKind.Text, "[", position);
return(true);
}
if (current == '/')
{
_reader.Read();
if (_reader.Eof)
{
throw new InvalidOperationException($"Encountered malformed markup tag at position {_reader.Position}.");
}
current = _reader.Peek();
if (current != ']')
{
throw new InvalidOperationException($"Encountered malformed markup tag at position {_reader.Position}.");
}
_reader.Read();
Current = new MarkupToken(MarkupTokenKind.Close, string.Empty, position);
return(true);
}
var builder = new StringBuilder();
while (!_reader.Eof)
{
current = _reader.Peek();
if (current == ']')
{
break;
}
builder.Append(_reader.Read());
}
if (_reader.Eof)
{
throw new InvalidOperationException($"Encountered malformed markup tag at position {_reader.Position}.");
}
_reader.Read();
Current = new MarkupToken(MarkupTokenKind.Open, builder.ToString(), position);
return(true);
}
else
{
var position = _reader.Position;
var builder = new StringBuilder();
var encounteredClosing = false;
while (!_reader.Eof)
{
current = _reader.Peek();
if (current == '[')
{
break;
}
else if (current == ']')
{
if (encounteredClosing)
{
_reader.Read();
encounteredClosing = false;
continue;
}
encounteredClosing = true;
}
else
{
if (encounteredClosing)
{
throw new InvalidOperationException(
$"Encountered unescaped ']' token at position {_reader.Position}");
}
}
builder.Append(_reader.Read());
}
if (encounteredClosing)
{
throw new InvalidOperationException($"Encountered unescaped ']' token at position {_reader.Position}");
}
Current = new MarkupToken(MarkupTokenKind.Text, builder.ToString(), position);
return(true);
}
}
