public static QueryFunction GetFunction(string s, string v)
{
switch (s)
{
case "first":
return(new QueryFunction()
{
Type = s
});
case "contains":
{
if (v != null)
{
return new QueryFunction()
{
Type = s, Parameter = v
}
}
;
}
break;
case "eq":
{
int x = 0;
if (int.TryParse(v, out x))
{
return new QueryFunction()
{
Type = s, Parameter = x
}
}
;
;
}
break;
case "not":
{
if (v != null)
{
var q1 = new CSSQuery(v);
return(new QueryFunction()
{
Type = s, Parameter = q1
});
}
}
break;
}
return(null);
}
public static string RemoveTags(this string txt, string query)
{
var builder = new StringBuilder();
var hq = new CSSQuery(query);
var index = 0;
while (txt != null && index < txt.Length)
{
var elementStart = 0;
var e = HTMLParsing.NextElement(builder, ref index, txt, out elementStart);
if (index >= txt.Length)
{
break;
}
if (e == hq.Element || string.IsNullOrEmpty(hq.Element))
{
index = elementStart;
if (HTMLParsing.Validate(builder, ref index, txt, hq))
{
if (hq.Function != null)
{
var item = hq.Function.Post(builder, txt, ref index, e);
if (!string.IsNullOrEmpty(item))
{
txt = txt.Remove(elementStart, index - elementStart);
index = elementStart;
}
index++;
}
else
{
var subIndex = HTMLParsing.FindEndofElement(builder, txt, elementStart, e);
if (subIndex >= 0)
{
txt = txt.Remove(elementStart, subIndex);
index = elementStart;
}
}
}
}
index++;
}
return(txt);
}
//todo - more selector support
//todo - fix attribute parsing
public static IEnumerable <string> QueryHtml(string txt, CSSQuery query, bool firstlevel = false)
{
var builder = new StringBuilder();
var index = 0;
while (txt != null && index < txt.Length)
{
var elementStart = 0;
var e = NextElement(builder, ref index, txt, out elementStart);
if (index >= txt.Length)
{
break;
}
if (e.Equals(query.Element, StringComparison.InvariantCultureIgnoreCase) || string.IsNullOrEmpty(query.Element))
{
if (Validate(builder, ref index, txt, query))
{
index = elementStart;
if (query.Function != null)
{
var item = query.Function.Post(builder, txt, ref index, e);
if (!string.IsNullOrEmpty(item))
{
yield return(item);
}
}
else
{
yield return(ParseElement(builder, txt, ref index, e, firstlevel));
}
//if (firstlevel)
//{
// index = FindEndofElement(builder, txt, index, query.Element);
//}
index++;
}
}
}
}
public static bool Validate(StringBuilder builder, ref int index, string data, CSSQuery query)
{
var attributes = GetAttributes(builder, ref index, data);
var allFound = true;
foreach (var qv in query.Values)
{
allFound = false;
foreach (var ea in attributes)
{
if (qv.Name.Equals(ea.Name, StringComparison.InvariantCultureIgnoreCase))
{
allFound = true;
if (!string.IsNullOrWhiteSpace(qv.Value))
{
allFound = false;
if (!string.IsNullOrWhiteSpace(ea.Value))
{
var id1 = ea.Value.IndexOf(qv.Value, StringComparison.InvariantCulture);
if (id1 >= 0)
{
var ch3 = ea.Value[id1 - 1];
if (ch3 == ' ' || ch3 == '\'' || ch3 == '"')
{
var lastPlace = id1 + qv.Value.Length;
if (lastPlace >= ea.Value.Length)
{
allFound = true;
}
else
{
var c2 = ea.Value[lastPlace];
if (c2 == ' ' || c2 == '\'' || c2 == '"')
{
allFound = true;
}
}
}
}
}
}
}
}
if (!allFound)
{
break;
}
}
return(allFound);
}
