private static CompletionItemRules MakeRule(bool importDirective, bool preselect, bool tupleLiteral)
{
// '<' should not filter the completion list, even though it's in generic items like IList<>
var generalBaseline = CompletionItemRules.Default.
WithFilterCharacterRule(CharacterSetModificationRule.Create(CharacterSetModificationKind.Remove, '<')).
WithCommitCharacterRule(CharacterSetModificationRule.Create(CharacterSetModificationKind.Add, '<'));
var importDirectiveBaseline = CompletionItemRules.Create(commitCharacterRules:
ImmutableArray.Create(CharacterSetModificationRule.Create(CharacterSetModificationKind.Replace, '.', ';')));
var rule = importDirective ? importDirectiveBaseline : generalBaseline;
if (preselect)
{
rule = rule.WithSelectionBehavior(CompletionItemSelectionBehavior.HardSelection);
}
if (tupleLiteral)
{
rule = rule
.WithCommitCharacterRule(CharacterSetModificationRule.Create(CharacterSetModificationKind.Remove, ':'));
}
return(rule);
}
const string InsertionTextKey = "InsertionText/914D9212-A782-45C9-970F-405B732E10B5"; // hopefully unique id
public CompletionItem CreateCompletionItem(string insertionText, string descriptionText, string[] tags) =>
CompletionItem.Create(descriptionText,
properties: ImmutableDictionary <string, string> .Empty.Add(InsertionTextKey, insertionText), // add custom insertion text property to be used in GetChangeAsync
tags: ImmutableArray.Create(tags),
rules: CompletionItemRules.Create(
// allow usage of open paren while writing the identifier
filterCharacterRules: ImmutableArray <CharacterSetModificationRule> .Empty.Add(CharacterSetModificationRule.Create(CharacterSetModificationKind.Add, '(')),
commitCharacterRules: ImmutableArray <CharacterSetModificationRule> .Empty.Add(CharacterSetModificationRule.Create(CharacterSetModificationKind.Remove, '('))
));