public static string WrapElements(this string html, Func <Fragment, bool> matchElement, Func <string> before, Func <string> after, WrapElementsType wrapType)
{
StringBuilder sb = new StringBuilder(html.Length);
void AppendElement(WithinElementDomElementEvent ev)
{
if (ev.ElementEvent.Fragment != null)
{
sb.Append(html, ev.ElementEvent.Fragment.Trivia.StartPosition, ev.ElementEvent.Fragment.Trivia.Length);
}
}
var events = HtmlLexer.Read(html).WithInElement(matchElement, false);
events.ProcessElements(
outside: AppendElement,
onEnter: (ev) =>
{
switch (wrapType)
{
case WrapElementsType.ReplaceMatchedElements:
sb.Append(before?.Invoke());
break;
case WrapElementsType.AddOuterWrapper:
sb.Append(before?.Invoke());
AppendElement(ev);
break;
case WrapElementsType.AddInnerWrapper:
AppendElement(ev);
sb.Append(before?.Invoke());
break;
}
},
inside: AppendElement,
onExit: (ev) =>
{
switch (wrapType)
{
case WrapElementsType.ReplaceMatchedElements:
sb.Append(after?.Invoke());
break;
case WrapElementsType.AddOuterWrapper:
AppendElement(ev);
sb.Append(after?.Invoke());
break;
case WrapElementsType.AddInnerWrapper:
sb.Append(after?.Invoke());
AppendElement(ev);
break;
}
});
return(sb.ToString());
}
public static IEnumerable <string> ExtractElementsList(this string html, Func <Fragment, bool> matchElement, NodeType nodeType, bool textOnly = false)
{
StringBuilder sb = new StringBuilder();
List <string> output = new List <string>();
void appendElement(WithinElementDomElementEvent ev)
{
if (ev.ElementEvent.Fragment == null)
{
return;
}
if (textOnly && ev.ElementEvent.Fragment.FragmentType != FragmentType.Text)
{
return;
}
sb.Append(html, ev.ElementEvent.Fragment.Trivia.StartPosition, ev.ElementEvent.Fragment.Trivia.Length);
};
void AddToList()
{
output.Add(sb.ToString());
sb.Clear();
}
Action <WithinElementDomElementEvent> doNothing = (ev) => { };
var events = HtmlLexer.Read(html).WithInElement(matchElement, false);
events.ProcessElements(
outside: doNothing,
onEnter: (ev) =>
{
if (nodeType == NodeType.OuterNode)
{
appendElement(ev);
}
},
inside: appendElement,
onExit: (ev) =>
{
if (nodeType == NodeType.OuterNode)
{
appendElement(ev);
}
AddToList();
}
);
return(output);
}
public static string ReplaceElements(this string html, Func <Fragment, bool> matchElement, Func <string> replace, NodeType replaceType)
{
StringBuilder sb = new StringBuilder(html.Length);
void AppendElement(WithinElementDomElementEvent ev)
{
if (ev.ElementEvent.Fragment != null)
{
sb.Append(html, ev.ElementEvent.Fragment.Trivia.StartPosition, ev.ElementEvent.Fragment.Trivia.Length);
}
}
var events = HtmlLexer.Read(html).WithInElement(matchElement, false);
bool replaced = false;
events.ProcessElements(
outside: AppendElement,
onEnter: (ev) =>
{
switch (replaceType)
{
case NodeType.InnerNode:
AppendElement(ev);
break;
}
},
inside: (_) =>
{
if (!replaced)
{
sb.Append(replace?.Invoke());
replaced = true;
}
},
onExit: (ev) =>
{
switch (replaceType)
{
case NodeType.InnerNode:
AppendElement(ev);
break;
}
});
return(sb.ToString());
}
public static IEnumerable <DomElementEvent> Execute(string rawHtml) => Execute(HtmlLexer.Read(rawHtml));