private IList <HTMLElement> FindAll(string html, string tag, HTMLAttributes attributes, bool allElements)
{
var elm = InternalFindAll(html, tag, attributes, 0);
var list = new List <HTMLElement>();
if (elm.Item1 == -1)
{
return(list);
}
if (!allElements)
{
list.Add(elm.Item2);
return(list);
}
do
{
list.Add(elm.Item2);
elm = InternalFindAll(html, tag, attributes, elm.Item1);
} while (elm.Item1 != -1);
return(list);
}
private (int, HTMLElement) InternalFindAll(string html, string tag, HTMLAttributes attributes, int position)
{
var initPos = GetInitPosition(html, tag, attributes, position);
if (initPos.Item1 == -1)
{
return(-1, null);
}
while (initPos.Item1 > -1 && initPos.Item2 == 0)
{
initPos = GetInitPosition(html, tag, attributes, initPos.Item1);
}
if (initPos.Item1 == -1)
{
return(-1, null);
}
var endPos = GetEndPosition(html, tag, initPos.Item2);
return(endPos, new HTMLElement
{
TagName = tag,
Attributes = initPos.Item3,
Content = html.Substring(initPos.Item2, endPos - initPos.Item2)
});
}
public bool ExistsAllValues(HTMLAttributes parameters)
{
if (parameters == null)
{
return(false);
}
if (!ExistsAllKeys(parameters))
{
return(false);
}
var finded = true;
foreach (var keyValuePair in parameters)
{
var valueExpected = parameters[keyValuePair.Key].Split(" ");
finded &= this[keyValuePair.Key].Split(" ").Intersect(valueExpected).Count()
== valueExpected.Length;
if (!finded)
{
break;
}
}
return(finded);
}
public bool ExistsAllKeys(HTMLAttributes parameters)
{
if (parameters == null)
{
return(false);
}
return(Keys.Intersect(parameters.Keys).Count() == parameters.Keys.Count);
}
private static HTMLAttributes GetAttributes(string html)
{
var matchs = Regex.Matches(html, GetRegexAttribute(), RegexOptions.IgnoreCase);
if (matchs.Count == 0)
{
return(null);
}
var attrs = new HTMLAttributes();
foreach (Match match in matchs)
{
attrs.Add(match.Groups[MATCH_GROUP_NAME].Value,
match.Groups[MATCH_GROUP_VALUE].Value);
}
return(attrs);
}
private (int, int, HTMLAttributes) GetInitPosition(string html, string tag, HTMLAttributes attributes, int initPosition)
{
var initTag = $"<{tag}";
var initPos = html.IndexOf(initTag, initPosition);
if (initPos == -1)
{
return(-1, 0, null);
}
var termPos = html.IndexOf(">", initPos) + 1;
var tagFull = html.Substring(initPos, termPos - initPos);
var tagAttributes = GetAttributes(tagFull);
if (tagAttributes.HasAttributeInTag(attributes))
{
return(initPos, termPos, tagAttributes);
}
return(termPos, 0, null);
}
public IList <HTMLElement> FindAll(string html, string tag, HTMLAttributes attributes) => FindAll(html, tag, attributes, true);
public HTMLElement Find(string html, string tag, HTMLAttributes attributes) => FindAll(html, tag, attributes, false).FirstOrDefault();