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  1.  Home
  2. RPG400-L
  3. July 2017

Re: RPG easier/harder to use than other languages?

Let me try to put this into action:

You have a UI form (any form) that has the following hieracy:

form
.. tab
.... fieldgroup
...... field

This is the basic structure of all forms in a system. In JSON you will code
tre parts - an ID, a widget and som properties to the widget.
In JSON it will look like

{ "formId" : "myform", "xtype" : "form", "databinding" : "myFormData",
"properties" : "aaaa",
"tabs" : [
{ "tabId" : "mytab1", "xtype" : "tab", "properties" : "bbbb",
"fieldgroups" : [
{ "fieldgroupId" : "myfieldgroup1", "xtype" : "fieldgroup",
"properties" : "cccc",
"fields" : [
{ "fieldId" : "myfield1", "xtype" : "date", "properties" :
"ddddd" }
]
}
]
}
]
}

Since JSON is "just" a notation of a javascript object you are able to
build the complete structure in a javascript object and the run a single
JSON.stringify on the
object and then send the "configuration" to the browser that has a main
function that loops through the recieved structure and call corresponding
widgets that renders html according to the xtype.

The xtype is not only for html rendering but is a javascript function so
behind the scene myfield1 becomes a new javascript function based on the
date-widget with methods and eventlisteners that may react to general
events, events on the field such as mouseover or event in the data
(somebody else changes the myfield1.value somewhere)

The corresponding data may look like

myFormData = { fields: [
{ "fieldId" : "myfield1", "value" : "2017-07-05" }
]
}

Did anybody state that OO was dead? ;-)



On Wed, Jul 5, 2017 at 6:13 PM, jacobus erps <jacobus.erps@xxxxxxxxx> wrote:

In a later version, i'll also add support for serialization/deserialization
to/from a binary (BASE64) or textual representation.

On Wed, Jul 5, 2017 at 6:08 PM, Henrik Rützou <hr@xxxxxxxxxxxx> wrote:

Yes, but in javascript it is dynamic and we also have tre different type
of
copys:

Referential copy:

myNewObject = myObject

anything you do in myNewObject will also affect myObject even if
myNewObject is only a part of myObject like
myNewObject = myObject[1]

Shallow copy

myJSON = JSON.stringify(myObject)
myNewObject = JSON.parse(myJSON)

There is no reference between myNewObejct and myObject however any
functions aint copied since JSON don support datatype function.

Deep Copy

myNewObject = new myObject

There is no reference between myNewObject and myObject and myNewObject
will
be a exact copy of myObject.

On Wed, Jul 5, 2017 at 5:53 PM, jacobus erps <jacobus.erps@xxxxxxxxx>
wrote:

Henrik, now you got me...

However, one of the supported types is "pointer".
And now i'm thinking of it (thanks) i need to support not only
"pointer"
but also "procedure pointer".

JavaScript is very flexible and mallable, no contest there.
Functions as first-class citizens, i know.



On Wed, Jul 5, 2017 at 5:49 PM, Henrik Rützou <hr@xxxxxxxxxxxx> wrote:

Until you reach parm5 where you inject a function into the object;-)

myObject[1].parm5 = function(msg) { alert(msg) }

and execute it

myObject[1].parm5("Hello Jacobus")


On Wed, Jul 5, 2017 at 5:20 PM, jacobus erps <jacobus.erps@xxxxxxxxx

wrote:

Henrik,

With the map impl. i'm about to release you can do the same (well
sort
of):

Create the map:

map = rm_m(
rm_a('parm1') : rm_v( rm_i(1) : rm_i(2) : rm_i(3) ) :
rm_a('parm2') : rm_v( rm_i(4) : rm_i(5) : rm_i(6) ) );

This map has as key "parm1" with a list (vector) containing 1, 2,
3;

Now i add 4 to this list

rm_ins( rm__a(map:'parm1') : rm_i(4) : rm_i(4) );

rm_v actually creates a special map, where the keys are implied
(i.e.
they
keys will automatically become 1,2,3 etc).



On Wed, Jul 5, 2017 at 5:01 PM, Henrik Rützou <hr@xxxxxxxxxxxx>
wrote:

When you talk about dynamic array's in rpg you talk about no. of
elements
not as in javascript
where you may define a array within an array or an object
completely
dynamical

myObject = [
{ parm1 : "aaa", parm2 : [1,2,3,4] },
{ parm1 : "bbb", parm2 : [5,6,7,8] }
]

and then add parm3 and parm4 to the obejct in array element 1 in
myObject

myObject[1].parm3 = "tralala"
myObject[1].parm4 = ["a","b","c"]

Try to do that in RPG and remember there is no dcl statements
involved!


On Wed, Jul 5, 2017 at 4:37 PM, John Yeung <
gallium.arsenide@xxxxxxxxx

wrote:

[Cross-posted to RPG400-L and OPENSOURCE]

On Wed, Jul 5, 2017 at 9:39 AM, jacobus erps <
jacobus.erps@xxxxxxxxx

wrote:
What RPG misses is a vibrant eco system.
There are no standard libraries to speak of.
Lack of dynamic datastructures, like maps.

I certainly agree on the lack of standard libraries. I would
characterize RPG's ecosystem this way: Fledgling,
underpublicized,
growing. I agree it's not "vibrant" yet, but that may change.
It's
definitely going in the direction of vibrancy.

There was a recent mini-flurry of Stack Overflow questions by
someone
who has been working on their own dynamic data structures for
RPG.
(You're not that someone, are you?) Their results so far are
here:

<https://github.com/lppedd/RPG>

Dynamic arrays for RPG have been available for many years now
from
at
least Mihael Schmidt and Aaron Bartell, perhaps also others I'm
not
aware of. (As I said, underpublicized.)

I'm currently working on a versatile map implementation for
RPG,
hope
to
release it soon as an open source project.
The map may contain any combination of key/item data types
(integer,
packed
decimal, date, etc), iteration is done through cursors with
setll/setgt/read/readp/reade semantics.
The keys and items in a map maybe other maps too.

The Stack Overflow activity I mentioned above culminated in a
HashMap
implementation. I'm not sure it's as flexible as what you've
described
(allow a map to be a key?), but it ought to work very much like
Java's
HashMap.

I'm not too familiar with Java actually, but I know Python
pretty
well, and its built-in mapping structure (called "dictionary")
doesn't
allow keys to be mutable. Among other things, this prevents you
from
inadvertently mutating one key so that it becomes equal to
another
key.

If you're not LppEdd (Edoardo Luppi), you probably ought to at
least
check out what they've already done. For reference, the most
relevant
Stack Overflow question was this:

<https://stackoverflow.com/questions/44461953/hashmap-implem
entation-rpgle>

John Y.
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--
Regards,
Henrik Rützou

http://powerEXT.com <http://powerext.com/>
--
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--
Regards,
Henrik Rützou

http://powerEXT.com <http://powerext.com/>
--
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(RPG400-L)
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http://powerEXT.com <http://powerext.com/>
--
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