public override DynamicMetaObject Bind(DynamicMetaObject target, DynamicMetaObject[] args)
{
var restrictions = BindingRestrictions.Empty;
PhpTypeInfo phptype;
Expression target_expr;
//
var ctx = args[0];
var fldName = ResolveName(args, ref restrictions);
//
if (target.LimitType == typeof(PhpTypeInfo)) // static field
{
target_expr = null;
phptype = (PhpTypeInfo)target.Value;
//
restrictions = restrictions.Merge(BindingRestrictions.GetInstanceRestriction(target.Expression, phptype));
}
else
{
// instance field
object target_value;
BinderHelpers.TargetAsObject(target, out target_expr, out target_value, ref restrictions);
if (target_value == null)
{
var defaultexpr = ConvertExpression.BindDefault(_returnType);
if (!_access.Quiet())
{
// PhpException.VariableMisusedAsObject(target, _access.ReadRef)
var throwcall = Expression.Call(typeof(PhpException), "VariableMisusedAsObject", Array.Empty <Type>(),
ConvertExpression.BindToValue(target.Expression), Expression.Constant(_access.EnsureAlias()));
defaultexpr = Expression.Block(throwcall, defaultexpr);
}
return(new DynamicMetaObject(defaultexpr, restrictions));
}
var runtime_type = target_value.GetType();
//
if (target_expr.Type != runtime_type)
{
restrictions = restrictions.Merge(BindingRestrictions.GetTypeRestriction(target_expr, runtime_type));
target_expr = Expression.Convert(target_expr, runtime_type);
}
phptype = runtime_type.GetPhpTypeInfo();
}
Debug.Assert(IsClassConst == (target_expr == null));
//
var getter = IsClassConst
? BinderHelpers.BindClassConstant(phptype, _classContext, fldName, ctx.Expression)
: BinderHelpers.BindField(phptype, _classContext, target_expr, fldName, ctx.Expression, _access, null);
if (getter != null)
{
//
return(new DynamicMetaObject(ConvertExpression.Bind(getter, _returnType, ctx.Expression), restrictions));
}
// field not found
throw new NotImplementedException();
}
