/// <summary>
/// Retrieves quoted attribute value token at the current character stream position
/// </summary>
/// <param name="isScript">True if attribute is a script, like onclick</param>
/// <returns>Attribute value token</returns>
public IHtmlAttributeValueToken GetQuotedAttributeValue(bool isScript, int tagEnd)
{
Debug.Assert(_cs.IsAtString());
int start = _cs.Position;
char openQuote = _cs.CurrentChar;
int stringEnd = _stringClosure.GetStringClosureLocation(tagEnd);
_cs.Position = start;
var valueTokens = new List <IHtmlToken>();
valueTokens.Add(HtmlToken.FromBounds(HtmlTokenType.String, _cs.Position, stringEnd));
char closeQuote = '\0';
if (openQuote != '\0' && stringEnd - 1 != start)
{
closeQuote = _cs[stringEnd - 1];
if (closeQuote != openQuote)
{
closeQuote = '\0';
}
}
_cs.Position = stringEnd;
if (valueTokens.Count < 2)
{
if (isScript)
{
return(new ScriptAttributeValueToken(valueTokens[0], openQuote, closeQuote));
}
else
{
return(AttributeValueToken.Create(valueTokens[0], openQuote, closeQuote));
}
}
else
{
return(new CompositeAttributeValueToken(valueTokens.ToArray(), openQuote, closeQuote, isScript));
}
}
/// <summary>
/// Retrieves unquoted attribute value
/// </summary>
/// <returns>Attribute value token</returns>
public IHtmlAttributeValueToken GetUnquotedAttributeValue(int tagEnd)
{
// Need to handle <a b=c=d /> and figure out that c=d is a valid pair while
// b= is missing a value. One way is to check if 'c' happens to be
// one of the known HTML attributes, but it only works for plain HTML
// and won't work for ASP.NET controls that can define any attributes
// via .NET properties.
// Options (value is unquoted)
// a. Attribute value is either a sequence of characters or a number
// except if it is ID or CLASS.
// b. Attribute name is typically a sequence of characters and does not include digits
// c. Attribute value is not normally followed by =
Debug.Assert(!_cs.IsAtString());
AttributeValueToken token = null;
int start = _cs.Position;
int end = _cs.Position;
ITextRange nextTokenRange;
NextTokenType nextTokenType = NextToken.PeekNextToken(_cs, tagEnd, out nextTokenRange);
switch (nextTokenType)
{
case NextTokenType.None: // attrName={EOF}
case NextTokenType.Tag: // attName=<foo
case NextTokenType.Equals: // attrName==
return(null);
case NextTokenType.Number:
// attrName = 1.0
case NextTokenType.Unknown:
// id=#
case NextTokenType.Identifier:
// attrName = foo12. There are no know attributes of this form.
end = nextTokenRange.End;
break;
case NextTokenType.Letters:
// Legal value. Need to check against attribute names to be sure.
bool isKnownAttribute = AttributeTable.IsKnownAttribute(_cs.GetSubstringAt(nextTokenRange.Start, nextTokenRange.Length));
if (!isKnownAttribute)
{
end = nextTokenRange.End;
}
break;
}
char closeQuote = '\0';
if (end > start)
{
closeQuote = _cs[end - 1];
if (closeQuote != '\'' && closeQuote != '\"')
{
closeQuote = '\0';
}
}
token = AttributeValueToken.Create(HtmlToken.FromBounds(start, end), '\0', closeQuote);
_cs.Position = end;
return(token);
}