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.walk2(..) mostly done...

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Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>
This commit is contained in:
Alex A. Naanou 2019-08-23 06:24:17 +03:00
parent ac89db2c83
commit 2fc4cffa85
1 changed files with 57 additions and 13 deletions
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70
ui (gen4)/lib/widget/browse2.js
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@ -1926,16 +1926,46 @@ var BaseBrowserPrototype = {
// func(elem, i, path, next(..), stop())
// -> res???
//
//
// NOTE: when options.reverse is set to true, func(..) for a parent
// item is still called BEFORE it is called for the children but
// its return value is placed after, i.e. the func(..) call order
// is different to the result order.
//
//
// options format:
// {
// reverse: <bool>,
//
// ...
// }
//
//
// XXX add sections support...
walk2: function(func, options){
var that = this
var [func, options={}, context={}] = [...arguments]
// options...
var handleReverse = function(lst){
return options.reverse ?
lst.slice().reverse()
: lst }
// stopping mechanics...
var res
var Stop = new Error('walk2(..): Stop walk.')
var stop = function(res){ throw stop }
var Stop = context.stop ?
null
: new Error('walk2(..): Stop.')
var stop = context.stop =
context.stop
|| function(r){
res = r
throw Stop }
try {
var map
return this.items
return handleReverse(this.items)
.map(map = function(elem){
// XXX
var i = 0
@ -1950,24 +1980,38 @@ var BaseBrowserPrototype = {
children = elems == null ?
[]
: elems }
// handle item...
// XXX should func(..) be called before .children is handled
// in reverse mode???
var item =
[(elem instanceof Array || elem instanceof BaseBrowser) ?
// skip inlined block items...
[]
// XXX revise return value semantics...
// should false be treated the same as null and undefined???
: func.call(that, elem, i, path, next, stop) || []]
.flat()
return [
// item...
// XXX should we call func(..) on inlined sections???
// i.e. when elem instanceof Array || elem instanceof BaseBrowser ???
// ...should this be an option???
...[(elem instanceof Array || elem instanceof BaseBrowser) ?
[]
// XXX should that be root call context or the local call context???
: func.call(that, elem, i, path, next, stop) || []].flat(),
...!options.reverse ?
item
: [],
// children...
...children instanceof Array ?
children
handleReverse(children)
.map(map)
.flat()
: children instanceof BaseBrowser ?
// XXX add support for other handlers (???)
children
.walk2(func, options)
: [] ] })
.walk2(func, options, context)
: [],
// item (in reverse)...
...options.reverse ?
item
: [], ] })
.flat()
// handle Stop and errors...