Suggestion for conditional

[jck...@gmail.com]

following the selector@attribute syntax we could have:

"selector?classname" : "dataname".

shorthand for

"selector@class+" : function(){ this.dataname? " classname" : "" }

(ideal world, remove class if present)

"?classname" : "dataname". would behave like " @attribute" : value

"selector?" : "dataname"

shorthand for

"selector@style+" : function(){ this.dataname? " display:none" : "" }

--

"selector@?property" : "dataname"

conditional include property. Like "checked" "disabled" or [data-decoration] attribute. 

"selector??" : "dataname"

conditional skip the element from output

-------

for the two first rule (shorthand part) this could mean something like

selRx = /^(\+)?([^\@\+\?]+)?(\@)?(\?])?([^\+]+)?(\+)?$/,

m = sel.match(selRx);

prepend = !! m[1];

selector = m[2];

isattr = !!m[3]

iscond = !!m[4]

attr = m[5];

append = !! m[6];

if( iscond &&  !isattr){

   if(attr.length){

        cond_data = " "+attr

        attr = "class"

        append = true

   }else{

        cond_data = " display:none"

        attr = "style"

        append = true

   }

}

[Mic (BeeBole)]

Returning an empty string to an attribute, will make it disappear.

Or the filter in a loop will prevent a node to be repeated.

These are two kinds of conditionals already there.

What is missing is a conditional to output a node or not.

The style='display:none' is ok but not clean.

I'm not convinced by an additional notation for conditionals.

If you browse the group, you'll find some existing talks about it.

But if we would start something, I would put the question mark on the right side.

1) 'a@class+' : 'dataname ?'

=> would return the value of dataname if positive(true or !=="") otherwise an empty string.

2) 'a@class+' : 'dataname ? " classname":""'

=> would return " classname" if dataname is positive(true or !=="") otherwise an empty string

But that means a parsing/eval of the ? which is a pain

3) 'a' : 'dataname ?'

=> would add a style=display:none if dataname is negative(false, 0, empty string, etc.)

[jck...@gmail.com]

Ok you can do it rigth hand side.

Then it would require that dataname do not have a ? wich is reasonable.
The problem would be the : that could be valid inside a string

if you decide to go that route, here's a regexp that could help you.

it'll split the three part of a?b:c for you.

it's probably slow, but you can search for "?" then for ":" then try to make sens of string escape sequence.


([^?]+)\?((?:[^:'"]+|"[^"\\]*(?:\\.[^"\\]*)*"|'[^'\\]*(?:\\.[^'\\]*)*')*):([\s\S]*)

hello?world:hello

hello?wor":"ld:hello

hello?wor':'ld:hello

hello?wor"\":"ld:hello

hello?:hello

hello?: