private string GetAttributeValue(IHtmlAttributeValueToken valueToken)
{
int start = valueToken.Start;
if (valueToken.OpenQuote != '\0')
{
start++;
}
int end = valueToken.End;
if (valueToken.Length > 1 && valueToken.CloseQuote != '\0')
{
end--;
}
if (end > start)
{
return(_cs.GetSubstringAt(start, end - start));
}
return(String.Empty);
}
public AttributeToken(IHtmlToken nameToken, int equalsPosition, IHtmlAttributeValueToken value)
{
NameToken = nameToken;
EqualsSign = equalsPosition;
ValueToken = value;
}
internal AttributeToken GetAttributeState(int tagEnd, bool artifactTag, bool getValueInfo)
{
int eqPos = -1;
bool isScript = false;
IHtmlToken nameToken = null;
AttributeToken attributeToken = null;
_tokenizer.SkipWhitespace();
if (!_cs.IsEndOfStream())
{
nameToken = _tokenizer.GetNameToken(tagEnd, artifactTag);
// Allow whitespace before = per HTML standard
_tokenizer.SkipWhitespace();
if (_cs.CurrentChar != '=' && nameToken != null)
{
// standalone attribute
return(new AttributeToken(nameToken));
}
if (_cs.CurrentChar == '=')
{
eqPos = _cs.Position;
_cs.MoveToNextChar();
}
IHtmlAttributeValueToken value = null;
if (getValueInfo)
{
// Allow whitespace before = per HTML standard
_tokenizer.SkipWhitespace();
// Check if attribute name begins with 'on' which means its value is script like
// onclick="...". Script can legally include < > (like in if(x < y)... so we are
// going to assume that everything between quotes is the script code. Note also
// that script should always be quoted. If quote is missing, we assume that
// attribute has no value. We cannot tell if attribute is script if attribute name
// is an artifact, so we don't support <% %> = "script code".
if (_cs.IsAtString() && nameToken != null && nameToken.Length >= 2)
{
char c1 = _cs[nameToken.Start];
char c2 = _cs[nameToken.Start + 1];
if ((c1 == 'o' || c1 == 'O') && (c2 == 'n' || c2 == 'N'))
{
isScript = true;
}
}
value = GetAttributeValue(isScript, tagEnd);
// In some odd cases we may end up with no name, no equals sign and no value.
// Check if this is the case and if so, advance character stream position
// and try again.
if (nameToken != null || eqPos >= 0 || value != null)
{
attributeToken = new AttributeToken(nameToken, eqPos, value);
}
else
{
// We could not make sense at all - move on.
_cs.MoveToNextChar();
}
}
}
return(attributeToken);
}
public AttributeToken(IHtmlToken nameToken, int equalsPosition, IHtmlAttributeValueToken value) {
NameToken = nameToken;
EqualsSign = equalsPosition;
ValueToken = value;
}
private string GetAttributeValue(IHtmlAttributeValueToken valueToken) {
int start = valueToken.Start;
if (valueToken.OpenQuote != '\0')
start++;
int end = valueToken.End;
if (valueToken.Length > 1 && valueToken.CloseQuote != '\0')
end--;
if (end > start)
return _cs.GetSubstringAt(start, end - start);
return String.Empty;
}