private static OperatorDeclarationSyntax BuildEqualsOperator(SyntaxToken typeName, GeneratedPropertyInfo[] propertySources)
=> OperatorDeclaration(_boolTypeName, Token(SyntaxKind.EqualsEqualsToken))
.AddModifiers(Token(SyntaxKind.PublicKeyword), Token(SyntaxKind.StaticKeyword))
.AddParameterListParameters
(
Parameter(_xToken).WithType(ParseTypeName(typeName.Text)),
Parameter(_yToken).WithType(ParseTypeName(typeName.Text))
)
.WithExpressionBody
(
ArrowExpressionClause
(
BinaryExpression
(
SyntaxKind.LogicalOrExpression,
ReferenceEqualsCall.Equal(IdentifierName(_xToken), IdentifierName(_yToken)),
BinaryExpression
(
SyntaxKind.LogicalAndExpression,
ReferenceEqualsCall.IsNotNull(IdentifierName(_xToken)),
InvocationExpression
(
MemberAccessExpression
(
SyntaxKind.SimpleMemberAccessExpression, IdentifierName(_xToken), IdentifierName(nameof(IEquatable <object> .Equals))
),
ArgumentList().AddArguments(Argument(IdentifierName(_yToken)))
)
)
)
)
)
.WithSemicolonToken(Token(SyntaxKind.SemicolonToken));
private static ExpressionSyntax BuildEqualsBodyExpression(GeneratedPropertyInfo[] properties)
=> properties
.Select(property => BuildFieldEqualityCall(property))
.Aggregate
(
ReferenceEqualsCall.IsNotNull(IdentifierName(_otherArg)),
(old, current) => BinaryExpression(SyntaxKind.LogicalAndExpression, old, current)
);