public bool GetValueExtents(string tagString, int valueStartPosition, ref XmlParserCursor cursor)
{
if (tagString[valueStartPosition] != '"')
{
cursor.Invalidate();
}
else
{
// Skip the opening quote.
cursor.StartPosition = valueStartPosition + 1;
// The attribute value starts with '"'. The returned string will be unquoted.
int valueEndPos = FindExpectedChar(tagString, '"', cursor.StartPosition + 1);
while (valueEndPos != -1)
{
bool isEscaped = false;
int testChar = valueEndPos - 1;
while (testChar >= 0 && tagString[testChar] == '\\')
{
isEscaped = !isEscaped;
testChar--;
}
// If the quote is escaped with '\\', keep on searching for an non-escaped quote.
if (isEscaped)
{
valueEndPos = FindExpectedChar(tagString, '"', valueEndPos + 1);
}
else
{
break;
}
}
if (valueEndPos == -1)
{
cursor.Invalidate();
}
else
{
cursor.EndPosition = valueEndPos;
}
}
return(cursor.IsValid);
}
private bool Invalidate()
{
nameCursor.Invalidate();
valueCursor.Invalidate();
return(false);
}
/// <summary>
/// Invalidates the parser so that it cannot be used until reset. The method
/// returns a constant 'false' value, so that it can be used directly on 'return'
/// statement. For example: return Invalidate().
/// </summary>
/// <returns>Always returns false.</returns>
bool Invalidate()
{
_cursor.Invalidate();
_path.Clear();
return(false);
}