public SignatureHelp GetSignatureHelp(Position position, PageInfoStore store)
{
var node = TraceNode(position);
Node lastNode = null;
while (node != null)
{
switch (node)
{
case Template template:
var templateName = MwParserUtility.NormalizeTitle(template.Name);
if (string.IsNullOrEmpty(templateName))
{
return(null);
}
// i.e. redirect target
var redirectSource = store.TryGetTransclusionPageInfo(templateName);
if (redirectSource == null)
{
return(null);
}
var templateInfo = store.ResolveRedirectTarget(redirectSource);
if (templateInfo == null)
{
templateInfo = redirectSource;
redirectSource = null;
}
var help = new SignatureHelp
{
Signatures = new[] { templateInfo.ToSignatureInformation(redirectSource) },
ActiveSignature = 0,
ActiveParameter = -1,
};
if (lastNode is TemplateArgument arg)
{
// Magic Words are always positional, while it can fake "named arguments"
if (templateInfo.Type == PageType.MagicWord)
{
var pos = template.Arguments.IndexOf(arg);
help.ActiveParameter = pos;
}
else
{
var argName = arg.ArgumentName();
help.ActiveParameter = templateInfo.Arguments.IndexOf(p => p.Name == argName);
}
}
return(help);
case WikiLink wikiLink:
return(null);
}
lastNode = node;
node = node.ParentNode;
}
return(null);
}
GetCompletionItems(Position position, PageInfoStore store)
{
var innermostNode = TraceNode(position);
var innermostPlainText = innermostNode as PlainText;
var node = innermostNode;
Node lastNode = null;
// ... when the innermostPlainText is also the first node of all parent nodes
var isSimpleIdentifier = innermostPlainText != null;
var lastNodeIsSimpleIdentifier = isSimpleIdentifier;
// Trace the node from innermost to outermost.
while (node != null)
{
lastNodeIsSimpleIdentifier = isSimpleIdentifier;
isSimpleIdentifier = isSimpleIdentifier &&
(node is PlainText || lastNode.PreviousNode == null);
switch (node)
{
case Template template:
if (lastNodeIsSimpleIdentifier && lastNode == template.Name)
{
var enteredName = MwParserUtility.NormalizeTitle(GetTypedLhsText(innermostPlainText, position));
return(store.GetTransclusionCompletionItems(enteredName), true);
}
return(null, false);
case TemplateArgument argument:
// Do not show auto-completion for obvious argument values.
if (lastNodeIsSimpleIdentifier && (
lastNode == argument.Name || // | abc$ = def
argument.Name == null && lastNode == argument.Value // Anonymous argument, or unfinished argument name
))
{
var template = (Template)argument.ParentNode;
var templateInfo = store.TryGetTransclusionPageInfo(MwParserUtility.NormalizeTitle(template.Name));
return(templateInfo.Arguments
.Select(a => new CompletionItem(a.Name, CompletionItemKind.Property, a.Summary, a.Name + "=")),
false);
}
return(null, false);
case WikiLink wikiLink:
if (lastNodeIsSimpleIdentifier && lastNode == wikiLink.Target)
{
var enteredName = MwParserUtility.NormalizeTitle(GetTypedLhsText(innermostPlainText, position));
return(store.GetWikiLinkCompletionItems(enteredName), true);
}
return(null, false);
}
lastNode = node;
node = node.ParentNode;
}
return(null, false);
}