Re: [gwt-contrib] Fwd: jsinterop woes: Part 1: instanceof function in generics casting

2017-06-25 Thread Vassilis Virvilis 
 I was not remembering correctly and my last comment was off. I am not
using a create() method. So the editorial correction is

 s/and have a create() method instead of ordinal() that generates the
object//g



On Sun, Jun 25, 2017 at 6:23 PM, Vassilis Virvilis 
wrote:

> Hm...
>
> For me this d3 ordinal thing like implementing the () operator in c++. Is
> it a function with members and methods or is it an object with the ability
> to be called as a function?
>
> Anyway if you and Roberto say it is not a bug then it's not a bug.
>
> When I revisit my D3 bindings I will explore your proposals - but AFAIK
> there is no easy solution that resembles the original javascript API.
> Currently I prefer to copy paste among the inheritance pyramid (there are 2
> or 3 subtypes) and have a create() method instead of ordinal() that
> generates the object.
>
> If there is no objection I will post another stumbling block I encountered
> in my jsinterop journey.
>
>
> On Sun, Jun 25, 2017 at 5:35 PM, Thomas Broyer  wrote:
>
>>
>>
>> On Sunday, June 25, 2017 at 1:24:40 PM UTC+2, Vassilis Virvilis wrote:
>>>
>>> Ηι,
>>>
>>> thanks for answering
>>>
>>> d3.ordinal does not exist as you said. However d3.scale.ordinal exists
>>> and that part works great.
>>>
>>
>> But it is not a type, so you cannot use 'instanceof' on it.
>>
>>
>>> in d3 ordinal is both a function ordinal() which returns an ordinal
>>> instance and an object with more methods such as range() which is the crux
>>> of my issue.
>>>
>>> The problem there is that
>>>
>>>- public native  O range(I[] values);   *// this doesn't
>>>work*
>>>- // public native  Ordinal range(I[] values); *// this works*
>>>
>>> I would like to use the first definition because it allows reusing some
>>> code between different scales. Otherwise I have to copy-paste the range()
>>> method multiple times instead of put it in a base class.
>>>
>>
>> In Java, generics are more or less syntactic sugar for using the erased
>> type and casting values. So when using the first one, GWT will, when used
>> with O==Ordinal, generate a cast from Object to Ordinal, which IIUC is
>> what's causing the error, because your JsType is not a type that can be
>> checked (a cast is translated in JS to a type-check using 'instanceof').
>>
>>
>>> The problem is on the exceptions generated by the attempting casting.
>>>
>>> As you said this may not be a bug but not for the reason you mentioned.
>>>
>>> So the question remains: Should I report it as an issue?
>>>
>>
>> I would say no. Your @JsType is wrong. You should either use an interface
>> with @JsType(isNative=true, name="?", namespace=JsPackage.GLOBAL), or if
>> you want to use fields use a class with @JsType(isNative=true,
>> name="Object", namespace=JsPackage.GLOBAL)
>>
>> --
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>> 0610cbb3c2bd%40googlegroups.com
>> 
>> .
>>
>> For more options, visit https://groups.google.com/d/optout.
>>
>
>
>
> --
> Vassilis Virvilis
>



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Re: [gwt-contrib] Fwd: jsinterop woes: Part 1: instanceof function in generics casting

2017-06-25 Thread Vassilis Virvilis 
Hm...

For me this d3 ordinal thing like implementing the () operator in c++. Is
it a function with members and methods or is it an object with the ability
to be called as a function?

Anyway if you and Roberto say it is not a bug then it's not a bug.

When I revisit my D3 bindings I will explore your proposals - but AFAIK
there is no easy solution that resembles the original javascript API.
Currently I prefer to copy paste among the inheritance pyramid (there are 2
or 3 subtypes) and have a create() method instead of ordinal() that
generates the object.

If there is no objection I will post another stumbling block I encountered
in my jsinterop journey.


On Sun, Jun 25, 2017 at 5:35 PM, Thomas Broyer  wrote:

>
>
> On Sunday, June 25, 2017 at 1:24:40 PM UTC+2, Vassilis Virvilis wrote:
>>
>> Ηι,
>>
>> thanks for answering
>>
>> d3.ordinal does not exist as you said. However d3.scale.ordinal exists
>> and that part works great.
>>
>
> But it is not a type, so you cannot use 'instanceof' on it.
>
>
>> in d3 ordinal is both a function ordinal() which returns an ordinal
>> instance and an object with more methods such as range() which is the crux
>> of my issue.
>>
>> The problem there is that
>>
>>- public native  O range(I[] values);   *// this doesn't
>>work*
>>- // public native  Ordinal range(I[] values); *// this works*
>>
>> I would like to use the first definition because it allows reusing some
>> code between different scales. Otherwise I have to copy-paste the range()
>> method multiple times instead of put it in a base class.
>>
>
> In Java, generics are more or less syntactic sugar for using the erased
> type and casting values. So when using the first one, GWT will, when used
> with O==Ordinal, generate a cast from Object to Ordinal, which IIUC is
> what's causing the error, because your JsType is not a type that can be
> checked (a cast is translated in JS to a type-check using 'instanceof').
>
>
>> The problem is on the exceptions generated by the attempting casting.
>>
>> As you said this may not be a bug but not for the reason you mentioned.
>>
>> So the question remains: Should I report it as an issue?
>>
>
> I would say no. Your @JsType is wrong. You should either use an interface
> with @JsType(isNative=true, name="?", namespace=JsPackage.GLOBAL), or if
> you want to use fields use a class with @JsType(isNative=true,
> name="Object", namespace=JsPackage.GLOBAL)
>
> --
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> 48de-ab04-0610cbb3c2bd%40googlegroups.com
> 
> .
>
> For more options, visit https://groups.google.com/d/optout.
>



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Re: [gwt-contrib] Fwd: jsinterop woes: Part 1: instanceof function in generics casting

2017-06-25 Thread Thomas Broyer 


On Sunday, June 25, 2017 at 1:24:40 PM UTC+2, Vassilis Virvilis wrote:
>
> Ηι,
>
> thanks for answering
>
> d3.ordinal does not exist as you said. However d3.scale.ordinal exists and 
> that part works great.
>

But it is not a type, so you cannot use 'instanceof' on it.
 

> in d3 ordinal is both a function ordinal() which returns an ordinal 
> instance and an object with more methods such as range() which is the crux 
> of my issue.
>
> The problem there is that 
>
>- public native  O range(I[] values);   *// this doesn't 
>work*
>- // public native  Ordinal range(I[] values); *// this works*
>
> I would like to use the first definition because it allows reusing some 
> code between different scales. Otherwise I have to copy-paste the range() 
> method multiple times instead of put it in a base class.
>

In Java, generics are more or less syntactic sugar for using the erased 
type and casting values. So when using the first one, GWT will, when used 
with O==Ordinal, generate a cast from Object to Ordinal, which IIUC is 
what's causing the error, because your JsType is not a type that can be 
checked (a cast is translated in JS to a type-check using 'instanceof').
 

> The problem is on the exceptions generated by the attempting casting.
>
> As you said this may not be a bug but not for the reason you mentioned.
>
> So the question remains: Should I report it as an issue?
>

I would say no. Your @JsType is wrong. You should either use an interface 
with @JsType(isNative=true, name="?", namespace=JsPackage.GLOBAL), or if 
you want to use fields use a class with @JsType(isNative=true, 
name="Object", namespace=JsPackage.GLOBAL) 

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Re: [gwt-contrib] Fwd: jsinterop woes: Part 1: instanceof function in generics casting

2017-06-25 Thread Vassilis Virvilis 
Ηι,

thanks for answering

d3.ordinal does not exist as you said. However d3.scale.ordinal exists and
that part works great.

in d3 ordinal is both a function ordinal() which returns an ordinal
instance and an object with more methods such as range() which is the crux
of my issue.

The problem there is that

   - public native  O range(I[] values);   *// this doesn't work*
   - // public native  Ordinal range(I[] values); *// this works*

I would like to use the first definition because it allows reusing some
code between different scales. Otherwise I have to copy-paste the range()
method multiple times instead of put it in a base class.

The problem is on the exceptions generated by the attempting casting.

As you said this may not be a bug but not for the reason you mentioned.

So the question remains: Should I report it as an issue?

   Vassilis


On Sun, Jun 25, 2017 at 3:24 AM, 'Roberto Lublinerman' via GWT Contributors
 wrote:

> The declaration
>
>   package somepackage;
>
>   @JsNative(isTrue, name = "ordinal")
>   class Ordinal {
>   
>   }
>
> effectively says that there is a native type "somepackage.ordinal", which
> d3.ordinal is not.
>
> You can model it as a native interface for example where there is not such
> expectation.
>
> So as I understand your report this is not a bug but just an error in
> modellin
>
> On Sat, Jun 24, 2017 at 7:58 AM, Vassilis Virvilis 
> wrote:
>
>> Originally posted in gwt-users.
>>
>> Two questions:
>>
>>1. Do you want me to report it as a bug somewhere? and where that
>>would be?
>>2. I have two more. Do you want me to post them here or this is not
>>the right place to post at all?
>>
>>
>>
>> -- Forwarded message --
>> From: Vassilis Virvilis 
>> Date: Fri, Feb 24, 2017 at 2:26 PM
>> Subject: jsinterop woes: Part 1: instanceof function in generics casting
>> To: google-web-tool...@googlegroups.com
>>
>>
>> Hi,
>>
>> again I don't know if this is a bug but it hurts my style
>>
>> D3 defines d3.scale.ordinal as both a function and an object.
>> $wnd.d3.scale.ordinal returns function() in the browser's console though
>>
>>
>>@JsType(isNative = true, name = "ordinal")
>>>   public static class Ordinal {
>>>/** @todo TODO: this crashes. Why? */
>>>public native  O range(I[] values);   // this
>>> doesn't work
>>>//public native  Ordinal range(I[] values); // this works
>>>   }
>>>
>>
>> I want the generic type because then I can put it in a base class and
>> share some code.
>>
>> I am using it like this
>>
>>> D3.Scale.Ordinal color = D3.Scale.ordinal().range(new String[]
>>> {"#98abc5", "#8a89a6"});
>>>
>>
>> Here is the javascript exception:
>>
>> Error: java.lang.ClassCastException
>>> at java_lang_ClassCastException_ClassCastException__V.java_lang
>>> _Throwable_createError__Ljava_lang_String_2Ljava_lang_Object_2 [as
>>> package_private$java_lang$createError__Ljava_lang_String_2Ljava_lang_Object_2]
>>> (dashboard-0.js:7245)
>>> at java_lang_ClassCastException_ClassCastException__V.java_lang
>>> _Throwable_initializeBackingError__V [as 
>>> private$java_lang_Throwable$initializeBackingError__V]
>>> (dashboard-0.js:7300)
>>> at 
>>> java_lang_ClassCastException_ClassCastException__V.java_lang_Throwable_Throwable__V
>>> (dashboard-0.js:7133)
>>> at 
>>> java_lang_ClassCastException_ClassCastException__V.java_lang_Exception_Exception__V
>>> (dashboard-0.js:7381)
>>> at java_lang_ClassCastException_ClassCastException__V.java_lang
>>> _RuntimeException_RuntimeException__V (dashboard-0.js:29724)
>>> at java_lang_ClassCastException_ClassCastException__V
>>> (dashboard-0.js:57274)
>>> at javaemul_internal_InternalPreconditions_checkCriticalType__ZV
>>> (dashboard-0.js:72135)
>>> at javaemul_internal_InternalPreconditions_checkType__ZV
>>> (dashboard-0.js:72342)
>>> at com_google_gwt_lang_Cast_castToNative__Ljava_lang_Object_2Lc
>>> om_google_gwt_core_client_JavaScriptObject_2Ljava_lang_Object_2
>>> (dashboard-0.js:707)
>>>
>>
>> In
>>
>>> function com_google_gwt_lang_Cast_castToNative__Ljava_lang_Object_2Lc
>>> om_google_gwt_core_client_JavaScriptObject_2Ljava_lang_Object_2(src_0,
>>> jsType){
>>>   com_google_gwt_lang_Cast_$clinit__V();
>>>   javaemul_internal_InternalPreconditions_checkType__ZV(com_go
>>> ogle_gwt_lang_Cast_jsEquals__Ljava_lang_Object_2Ljava_lang_Object_2Z(src_0,
>>> null) || com_google_gwt_lang_Cast_jsinstanceOf__Ljava_lang_Object_2Lc
>>> om_google_gwt_core_client_JavaScriptObject_2Z(src_0, jsType));
>>>   return src_0;
>>> }
>>>
>>
>> Arguments:
>>
>>- src_0:
>>   - passed:
>>   - evaluated: function scale(x)
>>- jsType:
>>   - passed: $wnd.scale.ordinal
>>   - evaluated: function anonymous()
>>
>> The reason it fails is that
>>
>>> function com_google_gwt_lang_Cast_jsinstanceOf__Ljava_lang_Object_2Lc

Re: [gwt-contrib] Fwd: jsinterop woes: Part 1: instanceof function in generics casting

2017-06-24 Thread 'Roberto Lublinerman' via GWT Contributors 
The declaration

  package somepackage;

  @JsNative(isTrue, name = "ordinal")
  class Ordinal {
  
  }

effectively says that there is a native type "somepackage.ordinal", which
d3.ordinal is not.

You can model it as a native interface for example where there is not such
expectation.

So as I understand your report this is not a bug but just an error in
modellin

On Sat, Jun 24, 2017 at 7:58 AM, Vassilis Virvilis 
wrote:

> Originally posted in gwt-users.
>
> Two questions:
>
>1. Do you want me to report it as a bug somewhere? and where that
>would be?
>2. I have two more. Do you want me to post them here or this is not
>the right place to post at all?
>
>
>
> -- Forwarded message --
> From: Vassilis Virvilis 
> Date: Fri, Feb 24, 2017 at 2:26 PM
> Subject: jsinterop woes: Part 1: instanceof function in generics casting
> To: google-web-tool...@googlegroups.com
>
>
> Hi,
>
> again I don't know if this is a bug but it hurts my style
>
> D3 defines d3.scale.ordinal as both a function and an object.
> $wnd.d3.scale.ordinal returns function() in the browser's console though
>
>
>@JsType(isNative = true, name = "ordinal")
>>   public static class Ordinal {
>>/** @todo TODO: this crashes. Why? */
>>public native  O range(I[] values);   // this
>> doesn't work
>>//public native  Ordinal range(I[] values); // this works
>>   }
>>
>
> I want the generic type because then I can put it in a base class and
> share some code.
>
> I am using it like this
>
>> D3.Scale.Ordinal color = D3.Scale.ordinal().range(new String[]
>> {"#98abc5", "#8a89a6"});
>>
>
> Here is the javascript exception:
>
> Error: java.lang.ClassCastException
>> at java_lang_ClassCastException_ClassCastException__V.java_lang
>> _Throwable_createError__Ljava_lang_String_2Ljava_lang_Object_2 [as
>> package_private$java_lang$createError__Ljava_lang_String_2Ljava_lang_Object_2]
>> (dashboard-0.js:7245)
>> at java_lang_ClassCastException_ClassCastException__V.java_lang
>> _Throwable_initializeBackingError__V [as 
>> private$java_lang_Throwable$initializeBackingError__V]
>> (dashboard-0.js:7300)
>> at 
>> java_lang_ClassCastException_ClassCastException__V.java_lang_Throwable_Throwable__V
>> (dashboard-0.js:7133)
>> at 
>> java_lang_ClassCastException_ClassCastException__V.java_lang_Exception_Exception__V
>> (dashboard-0.js:7381)
>> at java_lang_ClassCastException_ClassCastException__V.java_lang
>> _RuntimeException_RuntimeException__V (dashboard-0.js:29724)
>> at java_lang_ClassCastException_ClassCastException__V
>> (dashboard-0.js:57274)
>> at javaemul_internal_InternalPreconditions_checkCriticalType__ZV
>> (dashboard-0.js:72135)
>> at javaemul_internal_InternalPreconditions_checkType__ZV
>> (dashboard-0.js:72342)
>> at com_google_gwt_lang_Cast_castToNative__Ljava_lang_Object_2Lc
>> om_google_gwt_core_client_JavaScriptObject_2Ljava_lang_Object_2
>> (dashboard-0.js:707)
>>
>
> In
>
>> function com_google_gwt_lang_Cast_castToNative__Ljava_lang_Object_2Lc
>> om_google_gwt_core_client_JavaScriptObject_2Ljava_lang_Object_2(src_0,
>> jsType){
>>   com_google_gwt_lang_Cast_$clinit__V();
>>   javaemul_internal_InternalPreconditions_checkType__ZV(com_go
>> ogle_gwt_lang_Cast_jsEquals__Ljava_lang_Object_2Ljava_lang_Object_2Z(src_0,
>> null) || com_google_gwt_lang_Cast_jsinstanceOf__Ljava_lang_Object_2Lc
>> om_google_gwt_core_client_JavaScriptObject_2Z(src_0, jsType));
>>   return src_0;
>> }
>>
>
> Arguments:
>
>- src_0:
>   - passed:
>   - evaluated: function scale(x)
>- jsType:
>   - passed: $wnd.scale.ordinal
>   - evaluated: function anonymous()
>
> The reason it fails is that
>
>> function com_google_gwt_lang_Cast_jsinstanceOf__Ljava_lang_Object_2Lc
>> om_google_gwt_core_client_JavaScriptObject_2Z(obj, jsType){
>>   com_google_gwt_lang_Cast_$clinit__V();
>>   return obj && (jsType && obj instanceof jsType);
>> }
>>
>
> obj is src_0 != null and jsType = function anonymous() != null but (obj
> instanceof jsType) === false
>
> Any idea about that?
>
> --
> Vassilis Virvilis
>
>
>
> --
> Vassilis Virvilis
>
> --
> You received this message because you are subscribed to the Google Groups
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> cgTbKTPzFktR7nxoCx2Sr9yutZHtxiw%40mail.gmail.com
> 
> .
> For more options, visit https://groups.google.com/d/optout.
>

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[gwt-contrib] Fwd: jsinterop woes: Part 1: instanceof function in generics casting

2017-06-24 Thread Vassilis Virvilis 
Originally posted in gwt-users.

Two questions:

   1. Do you want me to report it as a bug somewhere? and where that would
   be?
   2. I have two more. Do you want me to post them here or this is not the
   right place to post at all?



-- Forwarded message --
From: Vassilis Virvilis 
Date: Fri, Feb 24, 2017 at 2:26 PM
Subject: jsinterop woes: Part 1: instanceof function in generics casting
To: google-web-tool...@googlegroups.com


Hi,

again I don't know if this is a bug but it hurts my style

D3 defines d3.scale.ordinal as both a function and an object.
$wnd.d3.scale.ordinal returns function() in the browser's console though


   @JsType(isNative = true, name = "ordinal")
>   public static class Ordinal {
>/** @todo TODO: this crashes. Why? */
>public native  O range(I[] values);   // this doesn't
> work
>//public native  Ordinal range(I[] values); // this works
>   }
>

I want the generic type because then I can put it in a base class and share
some code.

I am using it like this

> D3.Scale.Ordinal color = D3.Scale.ordinal().range(new String[] {"#98abc5",
> "#8a89a6"});
>

Here is the javascript exception:

Error: java.lang.ClassCastException
> at java_lang_ClassCastException_ClassCastException__V.java_lang
> _Throwable_createError__Ljava_lang_String_2Ljava_lang_Object_2 [as
> package_private$java_lang$createError__Ljava_lang_String_2Ljava_lang_Object_2]
> (dashboard-0.js:7245)
> at java_lang_ClassCastException_ClassCastException__V.java_lang
> _Throwable_initializeBackingError__V [as 
> private$java_lang_Throwable$initializeBackingError__V]
> (dashboard-0.js:7300)
> at 
> java_lang_ClassCastException_ClassCastException__V.java_lang_Throwable_Throwable__V
> (dashboard-0.js:7133)
> at 
> java_lang_ClassCastException_ClassCastException__V.java_lang_Exception_Exception__V
> (dashboard-0.js:7381)
> at java_lang_ClassCastException_ClassCastException__V.java_lang
> _RuntimeException_RuntimeException__V (dashboard-0.js:29724)
> at java_lang_ClassCastException_ClassCastException__V
> (dashboard-0.js:57274)
> at javaemul_internal_InternalPreconditions_checkCriticalType__ZV
> (dashboard-0.js:72135)
> at javaemul_internal_InternalPreconditions_checkType__ZV
> (dashboard-0.js:72342)
> at com_google_gwt_lang_Cast_castToNative__Ljava_lang_Object_2Lc
> om_google_gwt_core_client_JavaScriptObject_2Ljava_lang_Object_2
> (dashboard-0.js:707)
>

In

> function com_google_gwt_lang_Cast_castToNative__Ljava_lang_Object_2Lc
> om_google_gwt_core_client_JavaScriptObject_2Ljava_lang_Object_2(src_0,
> jsType){
>   com_google_gwt_lang_Cast_$clinit__V();
>   javaemul_internal_InternalPreconditions_checkType__ZV(com_go
> ogle_gwt_lang_Cast_jsEquals__Ljava_lang_Object_2Ljava_lang_Object_2Z(src_0,
> null) || com_google_gwt_lang_Cast_jsinstanceOf__Ljava_lang_Object_2Lc
> om_google_gwt_core_client_JavaScriptObject_2Z(src_0, jsType));
>   return src_0;
> }
>

Arguments:

   - src_0:
  - passed:
  - evaluated: function scale(x)
   - jsType:
  - passed: $wnd.scale.ordinal
  - evaluated: function anonymous()

The reason it fails is that

> function com_google_gwt_lang_Cast_jsinstanceOf__Ljava_lang_Object_2Lc
> om_google_gwt_core_client_JavaScriptObject_2Z(obj, jsType){
>   com_google_gwt_lang_Cast_$clinit__V();
>   return obj && (jsType && obj instanceof jsType);
> }
>

obj is src_0 != null and jsType = function anonymous() != null but (obj
instanceof jsType) === false

Any idea about that?

-- 
Vassilis Virvilis



-- 
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