static Expression BindAccess(Expression expr, Expression ctx, AccessMask access, Expression rvalue) { if (access.EnsureObject()) { if (expr.Type == typeof(PhpAlias)) { // ((PhpAlias)fld).EnsureObject() expr = Expression.Call(expr, Cache.Operators.PhpAlias_EnsureObject); } else if (expr.Type == typeof(PhpValue)) { // ((PhpValue)fld).EnsureObject() expr = Expression.Call(expr, Cache.Operators.PhpValue_EnsureObject); } else { // getter // TODO: ensure it is not null Debug.Assert(!expr.Type.GetTypeInfo().IsValueType); } } else if (access.EnsureArray()) { if (expr.Type == typeof(PhpAlias)) { // ((PhpAlias)fld).EnsureArray() expr = Expression.Call(expr, Cache.Operators.PhpAlias_EnsureArray); } else if (expr.Type == typeof(PhpValue)) { // ((PhpValue)fld).EnsureArray() expr = Expression.Call(expr, Cache.Operators.PhpValue_EnsureArray); } else if (expr.Type == typeof(PhpArray)) { // (PhpArray)fld // TODO: ensure it is not null } else { // getter } } else if (access.EnsureAlias()) { if (expr.Type == typeof(PhpAlias)) { // (PhpAlias)getter } else if (expr.Type == typeof(PhpValue)) { // ((PhpValue)fld).EnsureAlias() expr = Expression.Call(expr, Cache.Operators.PhpValue_EnsureAlias); } else { // getter // cannot read as reference } } else if (access.WriteAlias()) { // write alias Debug.Assert(rvalue.Type == typeof(PhpAlias)); rvalue = ConvertExpression.Bind(rvalue, typeof(PhpAlias), ctx); if (expr.Type == typeof(PhpAlias)) { // ok } else if (expr.Type == typeof(PhpValue)) { // fld = PhpValue.Create(alias) rvalue = Expression.Call(typeof(PhpValue).GetMethod("Create", Cache.Types.PhpAlias), rvalue); } else { // fld is not aliasable Debug.Assert(false, "Cannot assign aliased value to field of type " + expr.Type.ToString()); rvalue = ConvertExpression.Bind(rvalue, expr.Type, ctx); } expr = Expression.Assign(expr, rvalue); } else if (access.Unset()) { Debug.Assert(rvalue == null); expr = Expression.Assign(expr, ConvertExpression.BindDefault(expr.Type)); } else if (access.Write()) { // write by value if (expr.Type == typeof(PhpAlias)) { // Template: fld.Value = (PhpValue)value expr = Expression.Assign(Expression.PropertyOrField(expr, "Value"), ConvertExpression.Bind(rvalue, typeof(PhpValue), ctx)); } else if (expr.Type == typeof(PhpValue)) { // Template: Operators.SetValue(ref fld, (PhpValue)value) expr = Expression.Call(Cache.Operators.SetValue_PhpValueRef_PhpValue, expr, ConvertExpression.Bind(rvalue, typeof(PhpValue), ctx)); } else { // Template: fld = value // default behaviour by value to value expr = Expression.Assign(expr, ConvertExpression.Bind(rvalue, expr.Type, ctx)); } } else if (access.ReadCopy()) { // dereference & copy if (expr.Type == typeof(PhpValue)) { // Template: value.GetValue().DeepCopy() expr = Expression.Call(Expression.Call(expr, Cache.Operators.PhpValue_GetValue), Cache.Operators.PhpValue_DeepCopy); } else if (expr.Type == typeof(PhpAlias)) { } } // return(expr); }