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Re: Brython - Python in the browser

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Date Fri, 21 Dec 2012 23:57:01 -0800 (PST)
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I was over-simplifying - or, to put is less diplomatically, I screwed up - when I answered that the addition returned a string. As Chris pointed out, it made the explanation very confusing. My apologies

The objects handled by + and <= can be :
- strings, integers, floats
- instances of $TagClass instances (more precisely, of classes copied from $TagClass, one for each HTML tag) : they are wrappers around a DOM element. The DOM element itself is the attribute "elt" of the $TagClass instance
- the document, represented by the keyword doc. Its attribute "elt" is the document (top of the DOM tree)
- instances of $AbstractClass, a container with a list of DOM elements. This list is the attribute "children" of the $TagClass instance


Depending of the objects types, a+b returns the following objects :

string + string : string (!)
string + $TagClass : $AbstractTag with children [textNode(a),b.elt]
string + $AbstractTag : $AbstractTag with [textNode(b)]+ b.children

The 2 latter are implemented by the method __radd__ of $TagClass and $AbstractTag, invoqued by the method __add__ of the string class

$TagClass + string : $AbstractTag with [a.elt,textNode(b)]
$TagClass + $TagClass : $AbstractTag with [a.elt,b.elt]
$TagClass + $AbstractTag : $AbstractTag with [a.elt]+b.children
$AbstractTag + string : $AbstractTag with a.children+[textNode(b)]
$AbstractTag + $TagClass : $AbstractTag with a.children + [b.elt]
$AbstractTag + $AbstractTag : $AbstractTag with a.children + b.children

(any type) + doc : unsupported
doc + (any type) : unsupported

The operation x <= y does the following :

string <= (any object) : comparison, if possible

($TagClass | doc) <= string | integer | float : adds textNode(str(y)) to x.elt
($TagClass | doc) <= $TagClass : adds child y.elt to parent x.elt
($TagClass | doc) <= $AbstractTag : adds DOM elements in y.children to x.elt

$AbstractClass <= (any type) : unsupported

- Pierre

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Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-19 10:19 -0800
  Re: Brython - Python in the browser jkn <jkn_gg@nicorp.f9.co.uk> - 2012-12-19 14:59 -0800
  Re: Brython - Python in the browser Terry Reedy <tjreedy@udel.edu> - 2012-12-19 19:07 -0500
    Re: Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-20 01:37 -0800
      Re: Brython - Python in the browser Chris Angelico <rosuav@gmail.com> - 2012-12-20 20:56 +1100
      Re: Brython - Python in the browser Terry Reedy <tjreedy@udel.edu> - 2012-12-20 18:59 -0500
        Re: Brython - Python in the browser Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-12-21 02:05 +0000
          Re: Brython - Python in the browser Chris Angelico <rosuav@gmail.com> - 2012-12-21 16:07 +1100
        Re: Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-21 08:16 -0800
          Re: Brython - Python in the browser Stefan Behnel <stefan_ml@behnel.de> - 2012-12-21 17:52 +0100
          Re: Brython - Python in the browser Ian Kelly <ian.g.kelly@gmail.com> - 2012-12-21 11:31 -0700
            Re: Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-21 12:59 -0800
              Re: Brython - Python in the browser Ian Kelly <ian.g.kelly@gmail.com> - 2012-12-21 14:17 -0700
            Re: Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-21 12:59 -0800
        Re: Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-21 08:16 -0800
      Re: Brython - Python in the browser Rouslan Korneychuk <rouslank@msn.com> - 2012-12-21 03:31 -0500
        Re: Brython - Python in the browser Terry Reedy <tjreedy@udel.edu> - 2012-12-21 04:44 -0500
    Re: Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-20 01:37 -0800
  Re: Brython - Python in the browser Ian Kelly <ian.g.kelly@gmail.com> - 2012-12-19 17:54 -0700
    Re: Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-20 01:42 -0800
      Re: Brython - Python in the browser Stefan Behnel <stefan_ml@behnel.de> - 2012-12-21 12:25 +0100
        Re: Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-21 04:38 -0800
          Re: Brython - Python in the browser Chris Angelico <rosuav@gmail.com> - 2012-12-21 23:57 +1100
            Re: Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-21 07:36 -0800
              Re: Brython - Python in the browser Chris Angelico <rosuav@gmail.com> - 2012-12-22 02:48 +1100
                Re: Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-21 08:36 -0800
                Re: Brython - Python in the browser Chris Angelico <rosuav@gmail.com> - 2012-12-22 09:52 +1100
                Re: Brython - Python in the browser Ian Kelly <ian.g.kelly@gmail.com> - 2012-12-21 16:45 -0700
                Re: Brython - Python in the browser Amirouche Boubekki <amirouche.boubekki@gmail.com> - 2012-12-22 00:50 +0100
                Re: Brython - Python in the browser Ian Kelly <ian.g.kelly@gmail.com> - 2012-12-21 16:51 -0700
                Re: Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-21 23:59 -0800
                Re: Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-21 23:59 -0800
                Re: Brython - Python in the browser Ian Kelly <ian.g.kelly@gmail.com> - 2012-12-21 16:57 -0700
                Re: Brython - Python in the browser Chris Angelico <rosuav@gmail.com> - 2012-12-22 11:08 +1100
                Re: Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-21 23:57 -0800
                Re: Brython - Python in the browser Chris Angelico <rosuav@gmail.com> - 2012-12-22 19:31 +1100
                Re: Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-22 00:54 -0800
                Re: Brython - Python in the browser Chris Angelico <rosuav@gmail.com> - 2012-12-22 20:08 +1100
                Re: Brython - Python in the browser Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-12-22 11:05 +0000
                Re: Brython - Python in the browser Chris Angelico <rosuav@gmail.com> - 2012-12-22 23:11 +1100
                Re: Brython - Python in the browser Dan Sommers <dan@tombstonezero.net> - 2012-12-22 20:31 +0000
                Re: Brython - Python in the browser Ian Kelly <ian.g.kelly@gmail.com> - 2012-12-22 13:53 -0700
                Re: Brython - Python in the browser Chris Angelico <rosuav@gmail.com> - 2012-12-23 08:49 +1100
                Re: Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-22 00:54 -0800
                Re: Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-21 23:57 -0800
                Re: Brython - Python in the browser Chris Angelico <rosuav@gmail.com> - 2012-12-22 11:09 +1100
                Re: Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-21 08:36 -0800
            Re: Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-21 07:36 -0800
          Re: Brython - Python in the browser Duncan Booth <duncan.booth@invalid.invalid> - 2012-12-21 13:14 +0000
            Re: Brython - Python in the browser Stefan Behnel <stefan_ml@behnel.de> - 2012-12-21 14:34 +0100
        Re: Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-21 04:38 -0800
        Re: Brython - Python in the browser Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-12-22 02:31 +0000
    Re: Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-20 01:42 -0800
  Re: Brython - Python in the browser Terry Reedy <tjreedy@udel.edu> - 2012-12-19 21:46 -0500
  Re: Brython - Python in the browser Jamie Paul Griffin <jamie@kode5.net> - 2012-12-20 11:32 +0000
  Re: Brython - Python in the browser Pierre Quentel <pierre.quentel@gmail.com> - 2012-12-22 01:01 -0800

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