internal static bool TryGetSyntax(
SyntaxNode root,
int position,
ISyntaxFactsService syntaxFacts,
SignatureHelpTriggerReason triggerReason,
CancellationToken cancellationToken,
[NotNullWhen(true)] out ExpressionSyntax?identifier,
out SyntaxToken openBrace
)
{
if (
CommonSignatureHelpUtilities.TryGetSyntax(
root,
position,
syntaxFacts,
triggerReason,
IsTriggerToken,
IsArgumentListToken,
cancellationToken,
out ArrayTypeSyntax arrayTypeSyntax
)
)
{
identifier = arrayTypeSyntax.ElementType;
openBrace = arrayTypeSyntax.RankSpecifiers.First().OpenBracketToken;
return(true);
}
identifier = null;
openBrace = default;
return(false);
}
private bool TryGetConstructorInitializer(
SyntaxNode root,
int position,
ISyntaxFactsService syntaxFacts,
SignatureHelpTriggerReason triggerReason,
CancellationToken cancellationToken,
out ConstructorInitializerSyntax expression
)
{
if (
!CommonSignatureHelpUtilities.TryGetSyntax(
root,
position,
syntaxFacts,
triggerReason,
IsTriggerToken,
IsArgumentListToken,
cancellationToken,
out expression
)
)
{
return(false);
}
return(expression.ArgumentList != null);
}
internal static bool TryGetSyntax(
SyntaxNode root,
int position,
ISyntaxFactsService syntaxFacts,
SignatureHelpTriggerReason triggerReason,
CancellationToken cancellationToken,
[NotNullWhen(true)] out ExpressionSyntax?identifier,
out SyntaxToken openBrace
)
{
if (
CommonSignatureHelpUtilities.TryGetSyntax(
root,
position,
syntaxFacts,
triggerReason,
IsTriggerToken,
IsArgumentListToken,
cancellationToken,
out ElementAccessExpressionSyntax elementAccessExpression
)
)
{
identifier = elementAccessExpression.Expression;
openBrace = elementAccessExpression.ArgumentList.OpenBracketToken;
return(true);
}
identifier = null;
openBrace = default;
return(false);
}
private bool TryGetAttributeExpression(
SyntaxNode root,
int position,
ISyntaxFactsService syntaxFacts,
SignatureHelpTriggerReason triggerReason,
CancellationToken cancellationToken,
out AttributeSyntax attribute
)
{
if (
!CommonSignatureHelpUtilities.TryGetSyntax(
root,
position,
syntaxFacts,
triggerReason,
IsTriggerToken,
IsArgumentListToken,
cancellationToken,
out attribute
)
)
{
return(false);
}
return(attribute.ArgumentList != null);
}
protected virtual bool TryGetGenericIdentifier(
SyntaxNode root,
int position,
ISyntaxFactsService syntaxFacts,
SignatureHelpTriggerReason triggerReason,
CancellationToken cancellationToken,
out SyntaxToken genericIdentifier,
out SyntaxToken lessThanToken
)
{
if (
CommonSignatureHelpUtilities.TryGetSyntax(
root,
position,
syntaxFacts,
triggerReason,
IsTriggerToken,
IsArgumentListToken,
cancellationToken,
out GenericNameSyntax name
)
)
{
genericIdentifier = name.Identifier;
lessThanToken = name.TypeArgumentList.LessThanToken;
return(true);
}
genericIdentifier = default;
lessThanToken = default;
return(false);
}
private bool TryGetInvocationExpression(SyntaxNode root, int position, ISyntaxFactsService syntaxFacts, SignatureHelpTriggerReason triggerReason, CancellationToken cancellationToken, out InvocationExpressionSyntax expression)
{
if (!CommonSignatureHelpUtilities.TryGetSyntax(root, position, syntaxFacts, triggerReason, IsTriggerToken, IsArgumentListToken, cancellationToken, out expression))
{
return false;
}
return expression.ArgumentList != null;
}
internal static bool TryGetSyntax(SyntaxNode root, int position, ISyntaxFactsService syntaxFacts, SignatureHelpTriggerReason triggerReason, CancellationToken cancellationToken, out ExpressionSyntax identifier, out SyntaxToken openBrace)
{
ElementBindingExpressionSyntax elementBindingExpression;
if (CommonSignatureHelpUtilities.TryGetSyntax(root, position, syntaxFacts, triggerReason, IsTriggerToken, IsArgumentListToken, cancellationToken, out elementBindingExpression))
{
identifier = ((ConditionalAccessExpressionSyntax)elementBindingExpression.Parent).Expression;
openBrace = elementBindingExpression.ArgumentList.OpenBracketToken;
return(true);
}
identifier = null;
openBrace = default(SyntaxToken);
return(false);
}
internal static bool TryGetSyntax(SyntaxNode root, int position, ISyntaxFactsService syntaxFacts, SignatureHelpTriggerReason triggerReason, CancellationToken cancellationToken, out ExpressionSyntax identifier, out SyntaxToken openBrace)
{
if (CommonSignatureHelpUtilities.TryGetSyntax(root, position, syntaxFacts, triggerReason, IsTriggerToken, IsArgumentListToken, cancellationToken, out ElementBindingExpressionSyntax elementBindingExpression))
{
// Find the first conditional access expression that starts left of our open bracket
var conditionalAccess = elementBindingExpression.FirstAncestorOrSelf <ConditionalAccessExpressionSyntax>(
c => c.SpanStart < elementBindingExpression.SpanStart);
identifier = conditionalAccess.Expression;
openBrace = elementBindingExpression.ArgumentList.OpenBracketToken;
return(true);
}
identifier = null;
openBrace = default(SyntaxToken);
return(false);
}
private bool TryGetInitializerExpression(
SyntaxNode root,
int position,
ISyntaxFactsService syntaxFacts,
SignatureHelpTriggerReason triggerReason,
CancellationToken cancellationToken,
out InitializerExpressionSyntax expression
) =>
CommonSignatureHelpUtilities.TryGetSyntax(
root,
position,
syntaxFacts,
triggerReason,
IsTriggerToken,
IsInitializerExpressionToken,
cancellationToken,
out expression
) &&
expression != null;
private bool TryGetParenthesizedExpression(
SignatureHelpTriggerReason triggerReason,
SyntaxNode root,
int position,
ISyntaxFactsService syntaxFacts,
CancellationToken cancellationToken,
[NotNullWhen(true)] out ParenthesizedExpressionSyntax?parenthesizedExpression
)
{
return(CommonSignatureHelpUtilities.TryGetSyntax(
root,
position,
syntaxFacts,
triggerReason,
IsParenthesizedExpressionTriggerToken,
IsParenthesizedExpressionToken,
cancellationToken,
out parenthesizedExpression
));
}
private bool TryGetTupleExpression(
SignatureHelpTriggerReason triggerReason,
SyntaxNode root,
int position,
ISyntaxFactsService syntaxFacts,
CancellationToken cancellationToken,
[NotNullWhen(true)] out TupleExpressionSyntax?tupleExpression
)
{
return(CommonSignatureHelpUtilities.TryGetSyntax(
root,
position,
syntaxFacts,
triggerReason,
IsTupleExpressionTriggerToken,
IsTupleArgumentListToken,
cancellationToken,
out tupleExpression
));
}