private void WriteNumericEntity(Token token, TextWriter writer, NumberStyles styles)
{
ushort value;
if(ushort.TryParse(token.Text, styles, CultureInfo.InvariantCulture, out value))
{
writer.Write((char)value);
}
else
{
// Failed to parse, write it as content
WriteAsContext(token, writer);
}
}
private void WriteTextEntity(Token token, TextWriter writer)
{
char c;
if(_entityToCharMap.TryGetValue(token.Text, out c))
{
// We recognize the entity
writer.Write(c);
}
else
{
// Do not recognize, treat it as content
WriteAsContext(token, writer);
}
}
public Token? Next()
{
_text.Clear();
int startIndex = _index;
if(!ParseNext())
return null;
Token token = new Token();
token.Text = _text.ToString();
token.StartIndex = startIndex + 1;
token.EndIndex = _index + 1;
token.Type = _type;
return token;
}
private void WriteToken(Token token, TextWriter writer)
{
switch(token.Type)
{
case TokenType.Content:
WriteContent(token.Text, writer);
break;
case TokenType.TextEntity:
WriteTextEntity(token, writer);
break;
case TokenType.DecimalEntity:
WriteDecimalEntity(token, writer);
break;
case TokenType.HexEntity:
WriteHexEntity(token, writer);
break;
}
}
private void WriteHexEntity(Token token, TextWriter writer)
{
WriteNumericEntity(token, writer, NumberStyles.AllowHexSpecifier);
}
private void WriteDecimalEntity(Token token, TextWriter writer)
{
WriteNumericEntity(token, writer, NumberStyles.Integer);
}
private void WriteAsContext(Token token, TextWriter writer)
{
WriteContent(_html.Substring(token.StartIndex, token.EndIndex - token.StartIndex), writer);
}