} // func GetTargetDynamicCall
private DynamicMetaObject GetTargetDynamicCall(CallSiteBinder binder, Type typeReturn, DynamicMetaObject arg)
{
return(GetTargetDynamicCall(binder, typeReturn,
new Expression[]
{
GetFirstResultExpression(),
LuaEmit.Convert(Lua.GetRuntime(binder), arg.Expression, arg.LimitType, typeof(object), false)
}
));
} // func GetTargetDynamicCall
} // ctor
public override DynamicMetaObject FallbackConvert(DynamicMetaObject target, DynamicMetaObject errorSuggestion)
{
if (!target.HasValue)
{
return(Defer(target));
}
Expression expr = target.Expression;
BindingRestrictions restrictions = null;
if (target.Value == null) // get the default value
{
restrictions = target.Restrictions.Merge(BindingRestrictions.GetInstanceRestriction(target.Expression, null));
if (this.Type == typeof(LuaResult)) // replace null with empty LuaResult
{
expr = Expression.Property(null, Lua.ResultEmptyPropertyInfo);
}
else if (this.Type == typeof(string)) // replace null with empty String
{
expr = Expression.Field(null, Lua.StringEmptyFieldInfo);
}
else
{
expr = Expression.Default(this.Type);
}
}
else // convert the value
{
restrictions = target.Restrictions.Merge(BindingRestrictions.GetTypeRestriction(target.Expression, target.LimitType));
try
{
expr = LuaEmit.Convert(lua, target.Expression, target.LimitType, this.Type, false); // no dynamic allowed
}
catch (LuaEmitException e)
{
if (errorSuggestion != null)
{
return(errorSuggestion);
}
expr = ThrowExpression(e.Message, this.Type);
}
}
return(new DynamicMetaObject(expr, restrictions));
} // func FallbackConvert
} // func RestrictAccess
/// <summary>Most core method, that gets called to sandbox a value.</summary>
/// <param name="expression">Expression, that should be sandboxed.</param>
/// <param name="instance">Optional: Instance, that was called to get the expression.</param>
/// <param name="sMember">Optional: Name of the member that was used to resolve the expression.</param>
/// <returns>Sandboxed expression</returns>
protected internal virtual Expression SandboxCore(Expression expression, Expression instance, string sMember)
{
switch (Sandbox(expression.Type, instance == null ? null : instance.Type, sMember))
{
case LuaSandboxResult.Dynamic:
if (DynamicSandbox == null)
{
return(expression);
}
else
{
return(LuaEmit.Convert(null, Expression.Invoke(Expression.Constant(DynamicSandbox), expression), typeof(object), expression.Type, false));
}
case LuaSandboxResult.Restrict:
return(RestrictAccess());
default:
return(expression);
}
} // func SandboxCore
} // func BinaryOperationExpression
private static Expression ConcatOperationExpression(Lua runtime, Token tStart, Expression[] args)
{
if (Array.Exists(args, c => LuaEmit.IsDynamicType(c.Type))) // we have a dynamic type in the list -> to the concat on runtime
{
return(SafeExpression(() => Expression.Call(Lua.ConcatStringMethodInfo, Expression.NewArrayInit(typeof(object),
from e in args select ConvertObjectExpression(runtime, tStart, e, true))), tStart));
}
else
{
return(SafeExpression(() => Expression.Call(Lua.StringConcatMethodInfo, Expression.NewArrayInit(typeof(string),
from e in args select LuaEmit.Convert(runtime, e, e.Type, typeof(string), true))), tStart));
}
} // func ConcatOperationExpression
} // func ConvertObjectExpression
private static Expression ConvertExpression(Lua runtime, Token tStart, Expression expr, Type toType)
{
return(SafeExpression(() => LuaEmit.Convert(runtime, expr, expr.Type, toType, true), tStart));
} // func ConvertExpression
