public static bool IsNullConstantPattern(this PatternSyntaxWrapper pattern)
{
if (!ConstantPatternSyntaxWrapper.IsInstance(pattern))
{
return(false);
}
var constantPattern = (ConstantPatternSyntaxWrapper)pattern;
return(constantPattern.Expression.IsKind(SyntaxKind.NullLiteralExpression));
}
public void TestIsInstance()
{
Assert.False(PatternSyntaxWrapper.IsInstance(null));
Assert.False(PatternSyntaxWrapper.IsInstance(SyntaxFactory.LiteralExpression(SyntaxKind.NullLiteralExpression)));
var constantPatternSyntax = SyntaxFactory.ConstantPattern(SyntaxFactory.LiteralExpression(SyntaxKind.NullLiteralExpression));
Assert.True(PatternSyntaxWrapper.IsInstance(constantPatternSyntax));
var declarationPatternSyntax = SyntaxFactory.DeclarationPattern(
SyntaxFactory.PredefinedType(SyntaxFactory.Token(SyntaxKind.IntKeyword)),
SyntaxFactory.DiscardDesignation());
Assert.True(PatternSyntaxWrapper.IsInstance(declarationPatternSyntax));
}
public void TestConversionsNull()
{
var syntaxNode = default(SyntaxNode);
var declarationPatternSyntax = (DeclarationPatternSyntaxWrapper)syntaxNode;
PatternSyntaxWrapper patternSyntax = declarationPatternSyntax;
Assert.Null(patternSyntax.SyntaxNode);
declarationPatternSyntax = (DeclarationPatternSyntaxWrapper)patternSyntax;
Assert.Null(declarationPatternSyntax.SyntaxNode);
SyntaxNode syntax = declarationPatternSyntax;
Assert.Null(syntax);
}
public void TestConversions()
{
var syntaxNode = SyntaxFactory.ConstantPattern(SyntaxFactory.LiteralExpression(SyntaxKind.NullLiteralExpression));
var constantPatternSyntax = (ConstantPatternSyntaxWrapper)syntaxNode;
PatternSyntaxWrapper patternSyntax = constantPatternSyntax;
Assert.Same(syntaxNode, patternSyntax.SyntaxNode);
constantPatternSyntax = (ConstantPatternSyntaxWrapper)patternSyntax;
Assert.Same(syntaxNode, constantPatternSyntax.SyntaxNode);
SyntaxNode syntax = constantPatternSyntax;
Assert.Same(syntaxNode, syntax);
}
public void TestConversionsNull()
{
var syntaxNode = default(SyntaxNode);
var constantPatternSyntax = (ConstantPatternSyntaxWrapper)syntaxNode;
PatternSyntaxWrapper patternSyntax = constantPatternSyntax;
Assert.Null(patternSyntax.SyntaxNode);
constantPatternSyntax = (ConstantPatternSyntaxWrapper)patternSyntax;
Assert.Null(constantPatternSyntax.SyntaxNode);
SyntaxNode syntax = constantPatternSyntax;
Assert.Null(syntax);
}
public void TestConversions()
{
var syntaxNode = SyntaxFactory.DeclarationPattern(
SyntaxFactory.PredefinedType(SyntaxFactory.Token(SyntaxKind.IntKeyword)),
SyntaxFactory.DiscardDesignation());
var declarationPatternSyntax = (DeclarationPatternSyntaxWrapper)syntaxNode;
PatternSyntaxWrapper patternSyntax = declarationPatternSyntax;
Assert.Same(syntaxNode, patternSyntax.SyntaxNode);
declarationPatternSyntax = (DeclarationPatternSyntaxWrapper)patternSyntax;
Assert.Same(syntaxNode, declarationPatternSyntax.SyntaxNode);
SyntaxNode syntax = declarationPatternSyntax;
Assert.Same(syntaxNode, syntax);
}
public void TestIsInstance()
{
Assert.False(PatternSyntaxWrapper.IsInstance(null));
Assert.False(PatternSyntaxWrapper.IsInstance(SyntaxFactory.LiteralExpression(SyntaxKind.NullLiteralExpression)));
}
