Ejemplo n.º 1
0
        private static IList<SyntaxNode> CreateGetHashCodeMethodStatements(
            SyntaxGenerator factory,
            Compilation compilation,
            INamedTypeSymbol containingType,
            IList<ISymbol> members,
            CancellationToken cancellationToken)
        {
            const string HashCodeName = "hashCode";

            // -1521134295
            var permuteValue = factory.NegateExpression(
                factory.LiteralExpression(1521134295));

            var statements = new List<SyntaxNode>();

            var hashCodeNameExpression = factory.IdentifierName(HashCodeName);

            var firstHashValue = ComputeHashValue(factory, compilation, members[0]);
            if (members.Count == 1)
            {
#if false
                return this.S1.GetHashCode();
#endif
                statements.Add(factory.ReturnStatement(firstHashValue));
            }
            else
            {
#if false
                var hashCode = this.S1.GetHashCode();
#endif
                statements.Add(factory.LocalDeclarationStatement(HashCodeName, firstHashValue));

                for (var i = 1; i < members.Count; i++)
                {
#if false
                    hashCode = hashCode * 0xA5555529 + value
#endif
                    statements.Add(factory.ExpressionStatement(
                        factory.AssignmentStatement(hashCodeNameExpression,
                            factory.AddExpression(
                                factory.MultiplyExpression(hashCodeNameExpression, permuteValue),
                                ComputeHashValue(factory, compilation, members[i])))));
                }

#if false
                return hashCode;
#endif
                statements.Add(factory.ReturnStatement(hashCodeNameExpression));
            }

            return statements;
        }