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 SignatureHelpTriggerInfo(SignatureHelpTriggerReason triggerReason, char?triggerCharacter = null)
: this()
{
Contract.ThrowIfTrue(triggerReason == SignatureHelpTriggerReason.TypeCharCommand && triggerCharacter == null);
this.TriggerReason = triggerReason;
this.TriggerCharacter = triggerCharacter;
}
internal SignatureHelpTriggerInfo(SignatureHelpTriggerReason triggerReason, char? triggerCharacter = null)
: this()
{
Contract.ThrowIfTrue(triggerReason == SignatureHelpTriggerReason.TypeCharCommand && triggerCharacter == null);
this.TriggerReason = triggerReason;
this.TriggerCharacter = triggerCharacter;
}
internal void MapsCorrectly(SignatureHelpTriggerReason triggerReason)
{
var actual = FSharpSignatureHelpTriggerReasonHelpers.ConvertFrom(triggerReason);
var expected = GetExpectedTriggerReason(triggerReason);
Assert.Equal(expected, actual);
}
internal static FSharpSignatureHelpTriggerReason GetExpectedTriggerReason(SignatureHelpTriggerReason triggerReason)
{
switch (triggerReason)
{
case SignatureHelpTriggerReason.InvokeSignatureHelpCommand:
{
return(FSharpSignatureHelpTriggerReason.InvokeSignatureHelpCommand);
}
case SignatureHelpTriggerReason.RetriggerCommand:
{
return(FSharpSignatureHelpTriggerReason.RetriggerCommand);
}
case SignatureHelpTriggerReason.TypeCharCommand:
{
return(FSharpSignatureHelpTriggerReason.TypeCharCommand);
}
default:
{
throw ExceptionUtilities.UnexpectedValue(triggerReason);
}
}
}
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);
}
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 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 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;
}
public SignatureHelpTriggerInfo(SignatureHelpTriggerReason triggerReason, char?triggerCharacter = null)
{
if (triggerReason == SignatureHelpTriggerReason.TypeCharCommand && triggerCharacter == null)
{
throw new ArgumentException();
}
TriggerReason = triggerReason;
TriggerCharacter = triggerCharacter;
}
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;
}
internal static bool TryGetSyntax <TSyntax>(
SyntaxNode root,
int position,
ISyntaxFactsService syntaxFacts,
SignatureHelpTriggerReason triggerReason,
Func <SyntaxToken, bool> isTriggerToken,
Func <TSyntax, SyntaxToken, bool> isArgumentListToken,
CancellationToken cancellationToken,
out TSyntax expression
) where TSyntax : SyntaxNode
{
var token = syntaxFacts.FindTokenOnLeftOfPosition(root, position);
if (triggerReason == SignatureHelpTriggerReason.TypeCharCommand)
{
if (
isTriggerToken(token) &&
!syntaxFacts.IsInNonUserCode(root.SyntaxTree, position, cancellationToken)
)
{
expression = token.GetAncestor <TSyntax>();
return(true);
}
}
else if (triggerReason == SignatureHelpTriggerReason.InvokeSignatureHelpCommand)
{
expression = token.Parent
?.GetAncestorsOrThis <TSyntax>()
.SkipWhile(syntax => !isArgumentListToken(syntax, token))
.FirstOrDefault();
return(expression != null);
}
else if (triggerReason == SignatureHelpTriggerReason.RetriggerCommand)
{
if (
!syntaxFacts.IsInNonUserCode(root.SyntaxTree, position, cancellationToken) ||
syntaxFacts.IsEntirelyWithinStringOrCharOrNumericLiteral(
root.SyntaxTree,
position,
cancellationToken
)
)
{
expression = token.Parent
?.AncestorsAndSelf()
.TakeWhile(n => !syntaxFacts.IsAnonymousFunction(n))
.OfType <TSyntax>()
.SkipWhile(syntax => !isArgumentListToken(syntax, token))
.FirstOrDefault();
return(expression != null);
}
}
expression = null;
return(false);
}
internal static bool TryGetSyntax <TSyntax>(
SyntaxNode root,
int position,
ISyntaxFactsService syntaxFacts,
SignatureHelpTriggerReason triggerReason,
Func <SyntaxToken, bool> isTriggerToken,
Func <TSyntax, SyntaxToken, bool> isArgumentListToken,
CancellationToken cancellationToken,
out TSyntax expression)
where TSyntax : SyntaxNode
{
// Bug 1100661 reports an NRE from this method, but no manual repro has been found. To aid in debugging,
// any NRE thrown from here will generate a dump via FatalError.Report() below. try/catch was added 1/2/2015
// and is expected to be removed by 4/1/2015. --brettfo
try
{
var token = syntaxFacts.FindTokenOnLeftOfPosition(root, position);
if (triggerReason == SignatureHelpTriggerReason.TypeCharCommand)
{
if (isTriggerToken(token))
{
expression = token.GetAncestor <TSyntax>();
return(true);
}
}
else if (triggerReason == SignatureHelpTriggerReason.InvokeSignatureHelpCommand)
{
expression = token.Parent.GetAncestorsOrThis <TSyntax>().SkipWhile(syntax => !isArgumentListToken(syntax, token)).FirstOrDefault();
return(expression != null);
}
else if (triggerReason == SignatureHelpTriggerReason.RetriggerCommand)
{
if (!syntaxFacts.IsInNonUserCode(root.SyntaxTree, position, cancellationToken) ||
syntaxFacts.IsEntirelyWithinStringOrCharLiteral(root.SyntaxTree, position, cancellationToken))
{
expression = token.Parent.AncestorsAndSelf()
.TakeWhile(n => !syntaxFacts.IsAnonymousFunction(n))
.OfType <TSyntax>()
.SkipWhile(syntax => !isArgumentListToken(syntax, token))
.FirstOrDefault();
return(expression != null);
}
}
expression = null;
return(false);
}
catch (NullReferenceException e) when(FatalError.Report(e))
{
throw ExceptionUtilities.Unreachable;
}
}
static SIGHLP.SignatureHelpTriggerReason ToSignatureHelpTriggerReason(SignatureHelpTriggerReason triggerReason)
{
switch (triggerReason)
{
case SignatureHelpTriggerReason.InvokeSignatureHelpCommand: return(SIGHLP.SignatureHelpTriggerReason.InvokeSignatureHelpCommand);
case SignatureHelpTriggerReason.TypeCharCommand: return(SIGHLP.SignatureHelpTriggerReason.TypeCharCommand);
case SignatureHelpTriggerReason.RetriggerCommand: return(SIGHLP.SignatureHelpTriggerReason.RetriggerCommand);
default: throw new ArgumentOutOfRangeException(nameof(triggerReason));
}
}
protected override bool TryGetGenericIdentifier(
SyntaxNode root,
int position,
ISyntaxFactsService syntaxFacts,
SignatureHelpTriggerReason triggerReason,
CancellationToken cancellationToken,
out SyntaxToken genericIdentifier,
out SyntaxToken lessThanToken
) =>
root.SyntaxTree.IsInPartiallyWrittenGeneric(
position,
cancellationToken,
out genericIdentifier,
out lessThanToken
);
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(SyntaxToken);
lessThanToken = default(SyntaxToken);
return false;
}
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 ElementBindingExpressionSyntax elementBindingExpression
)
)
{
// Find the first conditional access expression that starts left of our open bracket
var conditionalAccess = elementBindingExpression.FirstAncestorOrSelf <
ConditionalAccessExpressionSyntax,
ElementBindingExpressionSyntax
>(
(c, elementBindingExpression) =>
c.SpanStart < elementBindingExpression.SpanStart,
elementBindingExpression
) !;
identifier = conditionalAccess.Expression;
openBrace = elementBindingExpression.ArgumentList.OpenBracketToken;
return(true);
}
identifier = null;
openBrace = default;
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 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
));
}
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 static bool TryGetElementAccessExpression(
SyntaxNode root,
int position,
ISyntaxFactsService syntaxFacts,
SignatureHelpTriggerReason triggerReason,
CancellationToken cancellationToken,
[NotNullWhen(true)] out ExpressionSyntax?identifier,
out SyntaxToken openBrace
)
{
return(CompleteElementAccessExpression.TryGetSyntax(
root,
position,
syntaxFacts,
triggerReason,
cancellationToken,
out identifier,
out openBrace
) ||
IncompleteElementAccessExpression.TryGetSyntax(
root,
position,
syntaxFacts,
triggerReason,
cancellationToken,
out identifier,
out openBrace
) ||
ConditionalAccessExpression.TryGetSyntax(
root,
position,
syntaxFacts,
triggerReason,
cancellationToken,
out identifier,
out openBrace
));
}
private static bool TryGetElementAccessExpression(SyntaxNode root, int position, ISyntaxFactsService syntaxFacts, SignatureHelpTriggerReason triggerReason, CancellationToken cancellationToken, out ExpressionSyntax identifier, out SyntaxToken openBrace)
{
return CompleteElementAccessExpression.TryGetSyntax(root, position, syntaxFacts, triggerReason, cancellationToken, out identifier, out openBrace) ||
IncompleteElementAccessExpression.TryGetSyntax(root, position, syntaxFacts, triggerReason, cancellationToken, out identifier, out openBrace);
}
internal static bool TryGetSyntax(SyntaxNode root, int position, ISyntaxFactsService syntaxFacts, SignatureHelpTriggerReason triggerReason, CancellationToken cancellationToken, out ExpressionSyntax identifier, out SyntaxToken openBrace)
{
ArrayTypeSyntax arrayTypeSyntax;
if (CommonSignatureHelpUtilities.TryGetSyntax(root, position, syntaxFacts, triggerReason, IsTriggerToken, IsArgumentListToken, cancellationToken, out arrayTypeSyntax))
{
identifier = arrayTypeSyntax.ElementType;
openBrace = arrayTypeSyntax.RankSpecifiers.First().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)
{
ElementAccessExpressionSyntax elementAccessExpression;
if (CommonSignatureHelpUtilities.TryGetSyntax(root, position, syntaxFacts, triggerReason, IsTriggerToken, IsArgumentListToken, cancellationToken, out elementAccessExpression))
{
identifier = elementAccessExpression.Expression;
openBrace = elementAccessExpression.ArgumentList.OpenBracketToken;
return true;
}
identifier = null;
openBrace = default(SyntaxToken);
return false;
}
public SignatureHelpTriggerInfo(SignatureHelpTriggerReason triggerReason, char? triggerCharacter = null) {
if (triggerReason == SignatureHelpTriggerReason.TypeCharCommand && triggerCharacter == null)
throw new ArgumentException();
TriggerReason = triggerReason;
TriggerCharacter = triggerCharacter;
}
private bool TryGetParenthesizedExpression(SignatureHelpTriggerReason triggerReason, SyntaxNode root, int position,
ISyntaxFactsService syntaxFacts, CancellationToken cancellationToken, 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, out TupleExpressionSyntax tupleExpression)
{
return CommonSignatureHelpUtilities.TryGetSyntax(root, position, syntaxFacts, triggerReason, IsTupleExpressionTriggerToken,
IsTupleArgumentListToken, cancellationToken, out tupleExpression);
}
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);
}
static SIGHLP.SignatureHelpTriggerReason ToSignatureHelpTriggerReason(SignatureHelpTriggerReason triggerReason) {
switch (triggerReason) {
case SignatureHelpTriggerReason.InvokeSignatureHelpCommand: return SIGHLP.SignatureHelpTriggerReason.InvokeSignatureHelpCommand;
case SignatureHelpTriggerReason.TypeCharCommand: return SIGHLP.SignatureHelpTriggerReason.TypeCharCommand;
case SignatureHelpTriggerReason.RetriggerCommand: return SIGHLP.SignatureHelpTriggerReason.RetriggerCommand;
default: throw new ArgumentOutOfRangeException(nameof(triggerReason));
}
}
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;
}
public SignatureHelpTriggerInfo(SignatureHelpTriggerReason triggerReason, char?triggerCharacter = null)
{
Inner = new Microsoft.CodeAnalysis.Editor.SignatureHelpTriggerInfo(
(Microsoft.CodeAnalysis.Editor.SignatureHelpTriggerReason)triggerReason, triggerCharacter);
}
public SignatureHelpTriggerInfo(SignatureHelpTriggerReason triggerReason, char?triggerCharacter = null)
{
TriggerReason = triggerReason;
TriggerCharacter = triggerCharacter;
}
public SignatureHelpTriggerInfo(SignatureHelpTriggerReason triggerReason, char? triggerCharacter = null)
{
Inner = new Microsoft.CodeAnalysis.Editor.SignatureHelpTriggerInfo(
(Microsoft.CodeAnalysis.Editor.SignatureHelpTriggerReason)triggerReason, triggerCharacter);
}
protected override bool TryGetGenericIdentifier(SyntaxNode root, int position, ISyntaxFactsService syntaxFacts, SignatureHelpTriggerReason triggerReason, CancellationToken cancellationToken, out SyntaxToken genericIdentifier, out SyntaxToken lessThanToken)
{
return root.SyntaxTree.IsInPartiallyWrittenGeneric(position, cancellationToken, out genericIdentifier, out lessThanToken);
}