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799 lines
23 KiB
JavaScript
Executable File
799 lines
23 KiB
JavaScript
Executable File
/**********************************************************************
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*
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* This defines the following extensions to Promise:
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*
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* Promise.iter(seq)
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* <promise>.iter()
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* Iterable promise object.
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* Similar to Promise.all(..) but adds basic iterator API.
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*
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* Promise.interactive(handler)
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* Interactive promise object.
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* This adds a basic message passing API to the promise.
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*
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* Promise.cooperative()
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* Cooperative promise object.
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* Exposes the API to resolve/reject the promise object
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* externally.
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*
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* <promise>.as(obj)
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* Promise proxy.
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* Proxies the methods available from obj to promise value.
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*
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*
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*
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*
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**********************************************/ /* c8 ignore next 2 */
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((typeof define)[0]=='u'?function(f){module.exports=f(require)}:define)
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(function(require){ var module={} // make module AMD/node compatible...
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/*********************************************************************/
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var object = require('ig-object')
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//var generator = require('./generator')
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//---------------------------------------------------------------------
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// Iterable promise...
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//
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// Like Promise.all(..) but adds ability to iterate through results
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// via generators .map(..)/.reduce(..) and friends...
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//
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// NOTE: the following can not be implemented here:
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// .splice(..) - can't both modify and return
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// a result...
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// .pop() / .shift() - can't modify the promise, use
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// .first() / .last() instead.
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// [Symbol.iterator]() - needs to be sync and we can't
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// know the number of elements to
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// return promises before the whole
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// iterable promise is resolved.
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// NOTE: we are not using async/await here as we need to control the
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// type of promise returned in cases where we know we are returning
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// an array...
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// NOTE: there is no point in implementing a 1:1 version of this that
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// would not support element expansion/contraction as it would only
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// simplify a couple of methods that are 1:1 (like .map(..) and
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// .some(..)) while methods like .filter(..) will throw everything
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// back to the complex IterablePromise...
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//
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// XXX how do we handle errors/rejections???
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// ...mostly the current state is OK, but need more testing...
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// XXX add support for async generators...
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//
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var iterPromiseProxy =
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module.iterPromiseProxy =
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function(name){
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return function(...args){
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return this.constructor(
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this.then(function(lst){
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return lst[name](...args) })) } }
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var promiseProxy =
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module.promiseProxy =
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function(name){
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return async function(...args){
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return (await this)[name](...args) } }
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var IterablePromise =
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module.IterablePromise =
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object.Constructor('IterablePromise', Promise, {
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get STOP(){
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return Array.STOP },
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}, {
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// packed array...
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//
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// Holds promise state.
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//
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// Format:
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// [
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// <non-array-value>,
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// [ <value> ],
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// <promise>,
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// ...
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// ]
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//
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// This format has several useful features:
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// - concatenating packed lists results in a packed list
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// - adding an iterable promise (as-is) into a packed list results
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// in a packed list
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//
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// NOTE: in general iterable promises are implicitly immutable, so
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// it is not recomended to ever edit this in-place...
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// NOTE: we are not isolating or "protecting" any internals to
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// enable users to responsibly extend the code.
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__packed: null,
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// low-level .__packed handlers/helpers...
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//
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// NOTE: these can be useful for debugging and extending...
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//
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// pack and oprionally transform/handle an array (sync)...
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//
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// NOTE: if 'types/Array' is imported this will support throwing STOP
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// from the handler.
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// Due to the async nature of promises though the way stops are
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// handled may be unpredictable -- the handlers can be run out
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// of order, as the nested promises resolve and thus throwing
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// stop will stop the handlers not yet run and not the next
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// handlers in sequence.
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// XXX EXPEREMENTAL: STOP...
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// XXX add support for async generators...
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// ...an async generator is not "parallel", i.e. intil one
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// returned promise is resolved the generator blocks (will not
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// advance)...
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// ...can we feed out a results one by one???
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__pack: function(list, handler=undefined){
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var that = this
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// handle iterable promise list...
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if(list instanceof IterablePromise){
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return this.__handle(list.__packed, handler) }
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// handle promise list...
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if(list instanceof Promise){
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return list.then(function(list){
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return that.__pack(list, handler) }) }
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// do the work...
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// NOTE: packing and handling are mixed here because it's faster
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// to do them both on a single list traverse...
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var handle = !!handler
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handler = handler
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?? function(elem){
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return [elem] }
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//* XXX EXPEREMENTAL: STOP...
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var stoppable = false
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var stop = false
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var map = 'map'
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var pack = function(){
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return [list].flat()
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[map](function(elem){
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return elem && elem.then ?
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(stoppable ?
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// stoppable -- need to handle stop async...
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elem
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.then(function(res){
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return !stop ?
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handler(res)
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: [] })
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// NOTE: we are using .catch(..) here
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// instead of directly passing the
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// error handler to be able to catch
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// the STOP from the handler...
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.catch(handleSTOP)
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// non-stoppable...
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: elem.then(handler))
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: elem instanceof Array ?
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handler(elem)
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// NOTE: we keep things that do not need protecting
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// from .flat() as-is...
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: !handle ?
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elem
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: handler(elem) }) }
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// pack (stoppable)...
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if(!!this.constructor.STOP){
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stoppable = true
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map = 'smap'
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var handleSTOP = function(err){
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stop = err
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if(err === that.constructor.STOP
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|| err instanceof that.constructor.STOP){
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return 'value' in err ?
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err.value
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: [] }
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throw err }
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try{
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return pack()
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}catch(err){
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return handleSTOP(err) } }
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// pack (non-stoppable)...
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return pack() },
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/*/
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return [list].flat()
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.map(function(elem){
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return elem && elem.then ?
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//that.__pack(elem, handler)
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elem.then(handler)
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: elem instanceof Array ?
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handler(elem)
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// NOTE: we keep things that do not need protecting
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// from .flat() as-is...
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: !handle ?
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elem
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: handler(elem) }) },
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//*/
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// transform/handle packed array (sync)...
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__handle: function(list, handler=undefined){
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var that = this
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if(typeof(list) == 'function'){
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handler = list
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list = this.__packed }
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if(!handler){
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return list }
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// handle promise list...
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if(list instanceof Promise){
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return list.then(function(list){
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return that.__handle(list, handler) }) }
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// do the work...
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// NOTE: since each section of the packed .__array is the same
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// structure as the input we'll use .__pack(..) to handle
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// them, this also keeps all the handling code in one place.
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//* XXX EXPEREMENTAL: STOP...
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var map = !!this.constructor.STOP ?
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'smap'
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: 'map'
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return list[map](function(elem){
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/*/
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return list.map(function(elem){
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//*/
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return elem instanceof Array ?
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that.__pack(elem, handler)
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: elem instanceof Promise ?
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that.__pack(elem, handler)
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//.then(function(elem){
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.then(function([elem]){
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return elem })
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: [handler(elem)] })
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.flat() },
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// unpack array (async)...
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__unpack: async function(list){
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list = list
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?? this.__packed
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// handle promise list...
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return list instanceof Promise ?
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this.__unpack(await list)
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// do the work...
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: (await Promise.all(list))
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.flat() },
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|
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// iterator methods...
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//
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// These will return a new IterablePromise instance...
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//
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// NOTE: these are different to Array's equivalents in that the handler
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// is called not in the order of the elements but rather in order
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// of promise resolution...
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// NOTE: index of items is unknowable because items can expand and
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// contract depending on handlers (e.g. .filter(..) can remove
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// items)...
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map: function(func){
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return this.constructor(this,
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function(e){
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var res = func(e)
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return res instanceof Promise ?
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res.then(function(e){
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return [e] })
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: [res] }) },
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filter: function(func){
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return this.constructor(this,
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function(e){
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var res = func(e)
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var _filter = function(elem){
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return res ?
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[elem]
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: [] }
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return res instanceof Promise ?
|
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res.then(_filter)
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: _filter(e) }) },
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// NOTE: this does not return an iterable promise as we can't know
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// what the user reduces to...
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// NOTE: the items can be handled out of order because the nested
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// promises can resolve in any order...
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// NOTE: since order of execution can not be guaranteed there is no
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// point in implementing .reduceRight(..) in the same way
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// (see below)...
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reduce: function(func, res){
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return this.constructor(this,
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function(e){
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res = func(res, e)
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return [] })
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.then(function(){
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return res }) },
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// XXX .chain(..) -- see generator.chain(..)
|
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flat: function(depth=1){
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return this.constructor(this,
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function(e){
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return (depth > 1
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&& e != null
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&& e.flat) ?
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e.flat(depth-1)
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: depth != 0 ?
|
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e
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: [e] }) },
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reverse: function(){
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var lst = this.__packed
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return this.constructor(
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lst instanceof Promise ?
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lst.then(function(elems){
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return elems instanceof Array ?
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elems.slice()
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.reverse()
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: elems })
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: lst
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.map(function(elems){
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return elems instanceof Array ?
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elems.slice()
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.reverse()
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: elems instanceof Promise ?
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elems.then(function(elems){
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return elems.reverse() })
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: elems })
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.reverse(),
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'raw') },
|
|
|
|
// NOTE: the following methods can create an unresolved promise from
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// a resolved promise...
|
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concat: function(other){
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var that = this
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var cur = this.__pack(this)
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var other = this.__pack(other)
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return this.constructor(
|
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// NOTE: we need to keep things as exposed as possible, this
|
|
// is why we're not blanketing all the cases with
|
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// Promise.all(..)...
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(cur instanceof Promise
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&& other instanceof Promise) ?
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[cur, other]
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: cur instanceof Promise ?
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[cur, ...other]
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: other instanceof Promise ?
|
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[...cur, other]
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: [...cur, ...other],
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'raw') },
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push: function(elem){
|
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return this.concat([elem]) },
|
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unshift: function(elem){
|
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return this.constructor([elem])
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.concat(this) },
|
|
|
|
// proxy methods...
|
|
//
|
|
// These require the whole promise to resolve to trigger.
|
|
//
|
|
// An exception to this would be .at(0)/.first() and .at(-1)/.last()
|
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// that can get the target element if it's accessible.
|
|
//
|
|
// NOTE: methods that are guaranteed to return an array will return
|
|
// an iterable promise (created with iterPromiseProxy(..))...
|
|
//
|
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at: async function(i){
|
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var list = this.__packed
|
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return ((i != 0 && i != -1)
|
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|| list instanceof Promise
|
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// XXX not sure if this is correct...
|
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|| list.at(i) instanceof Promise) ?
|
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(await this).at(i)
|
|
// NOTE: we can only reason about first/last explicit elements,
|
|
// anything else is non-deterministic...
|
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: list.at(i) instanceof Promise ?
|
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[await list.at(i)].flat().at(i)
|
|
: list.at(i) instanceof Array ?
|
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list.at(i).at(i)
|
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: list.at(i) },
|
|
first: function(){
|
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return this.at(0) },
|
|
last: function(){
|
|
return this.at(-1) },
|
|
|
|
// NOTE: unlike .reduce(..) this needs the parent fully resolved
|
|
// to be able to iterate from the end.
|
|
// XXX is it faster to do .reverse().reduce(..) ???
|
|
reduceRight: promiseProxy('reduceRight'),
|
|
|
|
// NOTE: there is no way we can do a sync generator returning
|
|
// promises for values because any promise in .__packed makes
|
|
// the value count/index non-deterministic...
|
|
sort: iterPromiseProxy('sort'),
|
|
slice: iterPromiseProxy('slice'),
|
|
|
|
entries: iterPromiseProxy('entries'),
|
|
keys: iterPromiseProxy('keys'),
|
|
values: iterPromiseProxy('values'),
|
|
|
|
indexOf: promiseProxy('indexOf'),
|
|
lastIndexOf: promiseProxy('lastIndexOf'),
|
|
includes: promiseProxy('includes'),
|
|
|
|
//
|
|
// .find(<func>)
|
|
// .find(<func>, 'value')
|
|
// -> <promise>(<value>)
|
|
//
|
|
// .find(<func>, 'result')
|
|
// -> <promise>(<result>)
|
|
//
|
|
// .find(<func>, 'bool')
|
|
// -> <promise>(<bool>)
|
|
//
|
|
// NOTE: this is slightly different to Array's .find(..) in that it
|
|
// accepts the result value enabling returning both the value
|
|
// itself ('value', default), the test function's result
|
|
// ('result') or true/false ('bool') -- this is added to be
|
|
// able to distinguish between the undefined as a stored value
|
|
// and undefined as a "nothing found" result.
|
|
// NOTE: I do not get how essentially identical methods .some(..)
|
|
// and .find(..) got added to JS's Array...
|
|
// the only benefit is that .some(..) handles undefined values
|
|
// stored in the array better...
|
|
// NOTE: this will return the result as soon as it's available but
|
|
// it will not stop the created but unresolved at the time
|
|
// promises from executing, this is both good and bad:
|
|
// + it will not break other clients waiting for promises
|
|
// to resolve...
|
|
// - if no clients are available this can lead to wasted
|
|
// CPU time...
|
|
find: async function(func, result='value'){
|
|
var that = this
|
|
// NOTE: not using pure await here as this is simpler to actually
|
|
// control the moment the resulting promise resolves without
|
|
// the need for juggling state...
|
|
return new Promise(function(resolve, reject){
|
|
var resolved = false
|
|
that.map(function(elem){
|
|
var res = func(elem)
|
|
if(res){
|
|
resolved = true
|
|
resolve(
|
|
result == 'bool' ?
|
|
true
|
|
: result == 'result' ?
|
|
res
|
|
: elem)
|
|
// XXX EXPEREMENTAL: STOP...
|
|
// NOTE: we do not need to throw STOP here
|
|
// but it can prevent some overhead...
|
|
if(that.constructor.STOP){
|
|
throw that.constructor.STOP } } })
|
|
.then(function(){
|
|
resolved
|
|
|| resolve(
|
|
result == 'bool' ?
|
|
false
|
|
: undefined) }) }) },
|
|
findIndex: promiseProxy('findIndex'),
|
|
|
|
// NOTE: this is just a special-case of .find(..)
|
|
some: async function(func){
|
|
return this.find(func, 'bool') },
|
|
every: promiseProxy('every'),
|
|
|
|
|
|
join: async function(){
|
|
return [...(await this)]
|
|
.join(...arguments) },
|
|
|
|
|
|
// this is defined globally as Promise.prototype.iter(..)
|
|
//
|
|
// for details see: PromiseMixin(..) below...
|
|
//iter: function(handler=undefined){ ... },
|
|
|
|
|
|
// promise api...
|
|
//
|
|
// Overload .then(..), .catch(..) and .finally(..) to return a plain
|
|
// Promise instnace...
|
|
//
|
|
// NOTE: .catch(..) and .finally(..) are implemented through .then(..)
|
|
// so we do not need to overload those...
|
|
// NOTE: this is slightly different from .then(..) in that it can be
|
|
// called without arguments and return a promise wrapper. This can
|
|
// be useful to hide special promise functionality...
|
|
then: function (onfulfilled, onrejected){
|
|
var p = new Promise(
|
|
function(resolve, reject){
|
|
Promise.prototype.then.call(this,
|
|
// NOTE: resolve(..) / reject(..) return undefined so
|
|
// we can't pass them directly here...
|
|
function(res){
|
|
resolve(res)
|
|
return res },
|
|
function(res){
|
|
reject(res)
|
|
return res }) }.bind(this))
|
|
return arguments.length > 0 ?
|
|
p.then(...arguments)
|
|
: p },
|
|
|
|
|
|
// constructor...
|
|
//
|
|
// Promise.iter([ .. ])
|
|
// -> iterable-promise
|
|
//
|
|
// Promise.iter([ .. ], handler)
|
|
// -> iterable-promise
|
|
//
|
|
//
|
|
// handler(e)
|
|
// -> [value, ..]
|
|
// -> []
|
|
// -> <promise>
|
|
//
|
|
//
|
|
// NOTE: element index is unknowable until the full list is expanded
|
|
// as handler(..)'s return value can expand to any number of
|
|
// items...
|
|
// XXX we can make the index a promise, then if the client needs
|
|
// the value they can wait for it...
|
|
// ...this may be quite an overhead...
|
|
//
|
|
//
|
|
// Special cases useful for extending this constructor...
|
|
//
|
|
// Set raw .__packed without any pre-processing...
|
|
// Promise.iter([ .. ], 'raw')
|
|
// -> iterable-promise
|
|
//
|
|
// Create a rejected iterator...
|
|
// Promise.iter(false)
|
|
// -> iterable-promise
|
|
//
|
|
//
|
|
// NOTE: if 'types/Array' is imported this will support throwing STOP,
|
|
// for more info see notes for .__pack(..)
|
|
// XXX EXPEREMENTAL: STOP...
|
|
__new__: function(_, list, handler){
|
|
// instance...
|
|
var promise
|
|
var obj = Reflect.construct(
|
|
IterablePromise.__proto__,
|
|
[function(resolve, reject){
|
|
// NOTE: this is here for Promise compatibility...
|
|
if(typeof(list) == 'function'){
|
|
return list.call(this, ...arguments) }
|
|
// initial reject...
|
|
if(list === false){
|
|
return reject() }
|
|
promise = {resolve, reject} }],
|
|
IterablePromise)
|
|
|
|
// populate new instance...
|
|
if(promise){
|
|
// handle/pack input data...
|
|
if(handler != 'raw'){
|
|
list = list instanceof IterablePromise ?
|
|
this.__handle(list.__packed, handler)
|
|
: this.__pack(list, handler) }
|
|
Object.defineProperty(obj, '__packed', {
|
|
value: list,
|
|
enumerable: false,
|
|
})
|
|
// handle promise state...
|
|
this.__unpack(list)
|
|
.then(function(list){
|
|
promise.resolve(list) })
|
|
.catch(promise.reject) }
|
|
|
|
return obj },
|
|
})
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------
|
|
// Interactive promise...
|
|
//
|
|
// Adds ability to send messages to the running promise.
|
|
//
|
|
|
|
var InteractivePromise =
|
|
module.InteractivePromise =
|
|
object.Constructor('InteractivePromise', Promise, {
|
|
// XXX do we need a way to remove handlers???
|
|
__message_handlers: null,
|
|
|
|
send: function(...args){
|
|
var that = this
|
|
;(this.__message_handlers || [])
|
|
.forEach(function(h){ h.call(that, ...args) })
|
|
return this },
|
|
|
|
then: IterablePromise.prototype.then,
|
|
|
|
//
|
|
// Promise.interactive(handler)
|
|
// -> interacive-promise
|
|
//
|
|
// handler(resolve, reject, onmessage)
|
|
//
|
|
// onmessage(func)
|
|
//
|
|
//
|
|
__new__: function(_, handler){
|
|
var handlers = []
|
|
|
|
var onmessage = function(func){
|
|
// remove all handlers...
|
|
if(func === false){
|
|
var h = (obj == null ?
|
|
handlers
|
|
: (obj.__message_handlers || []))
|
|
h.splice(0, handlers.length)
|
|
// remove a specific handler...
|
|
} else if(arguments[1] === false){
|
|
var h = (obj == null ?
|
|
handlers
|
|
: (obj.__message_handlers || []))
|
|
h.splice(h.indexOf(func), 1)
|
|
// register a handler...
|
|
} else {
|
|
var h = obj == null ?
|
|
// NOTE: we need to get the handlers from
|
|
// .__message_handlers unless we are not
|
|
// fully defined yet, then use the bootstrap
|
|
// container (handlers)...
|
|
// ...since we can call onmessage(..) while
|
|
// the promise is still defined there is no
|
|
// way to .send(..) until it returns a promise
|
|
// object, this races here are highly unlikely...
|
|
handlers
|
|
: (obj.__message_handlers =
|
|
obj.__message_handlers ?? [])
|
|
handlers.push(func) } }
|
|
|
|
var obj = Reflect.construct(
|
|
InteractivePromise.__proto__,
|
|
!handler ?
|
|
[]
|
|
: [function(resolve, reject){
|
|
return handler(resolve, reject, onmessage) }],
|
|
InteractivePromise)
|
|
Object.defineProperty(obj, '__message_handlers', {
|
|
value: handlers,
|
|
enumerable: false,
|
|
// XXX should this be .configurable???
|
|
configurable: true,
|
|
})
|
|
return obj },
|
|
})
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------
|
|
// Cooperative promise...
|
|
//
|
|
// A promise that can be resolved/rejected externally.
|
|
//
|
|
// NOTE: normally this has no internal resolver logic...
|
|
//
|
|
|
|
var CooperativePromise =
|
|
module.CooperativePromise =
|
|
object.Constructor('CooperativePromise', Promise, {
|
|
__handlers: null,
|
|
|
|
get isSet(){
|
|
return this.__handlers === false },
|
|
|
|
set: function(value, resolve=true){
|
|
// can't set twice...
|
|
if(this.isSet){
|
|
throw new Error('.set(..): can not set twice') }
|
|
// bind to promise...
|
|
if(value && value.then && value.catch){
|
|
value.then(handlers.resolve)
|
|
value.catch(handlers.reject)
|
|
// resolve with value...
|
|
} else {
|
|
resolve ?
|
|
this.__handlers.resolve(value)
|
|
: this.__handlers.reject(value) }
|
|
// cleanup and prevent setting twice...
|
|
this.__handlers = false
|
|
return this },
|
|
|
|
then: IterablePromise.prototype.then,
|
|
|
|
__new__: function(){
|
|
var handlers
|
|
var resolver = arguments[1]
|
|
|
|
var obj = Reflect.construct(
|
|
CooperativePromise.__proto__,
|
|
[function(resolve, reject){
|
|
handlers = {resolve, reject}
|
|
// NOTE: this is here to support builtin .then(..)
|
|
resolver
|
|
&& resolver(resolve, reject) }],
|
|
CooperativePromise)
|
|
|
|
Object.defineProperty(obj, '__handlers', {
|
|
value: handlers,
|
|
enumerable: false,
|
|
writable: true,
|
|
})
|
|
return obj },
|
|
})
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------
|
|
|
|
// XXX EXPEREMENTAL...
|
|
var ProxyPromise =
|
|
module.ProxyPromise =
|
|
object.Constructor('ProxyPromise', Promise, {
|
|
|
|
then: IterablePromise.prototype.then,
|
|
|
|
__new__: function(context, other, nooverride=false){
|
|
var proto = 'prototype' in other ?
|
|
other.prototype
|
|
: other
|
|
var obj = Reflect.construct(
|
|
ProxyPromise.__proto__,
|
|
[function(resolve, reject){
|
|
context.then(resolve)
|
|
context.catch(reject) }],
|
|
ProxyPromise)
|
|
// populate...
|
|
// NOTE: we are not using object.deepKeys(..) here as we need
|
|
// the key origin not to trigger property getters...
|
|
var seen = new Set()
|
|
nooverride = nooverride instanceof Array ?
|
|
new Set(nooverride)
|
|
: nooverride
|
|
while(proto != null){
|
|
Object.entries(Object.getOwnPropertyDescriptors(proto))
|
|
.forEach(function([key, value]){
|
|
// skip overloaded keys...
|
|
if(seen.has(key)){
|
|
return }
|
|
// skip non-functions...
|
|
if(typeof(value.value) != 'function'){
|
|
return }
|
|
// skip non-enumerable except for Object.prototype.run(..)...
|
|
if(!(key == 'run'
|
|
&& Object.prototype.run === value.value)
|
|
&& !value.enumerable){
|
|
return }
|
|
// do not override existing methods...
|
|
if(nooverride === true ?
|
|
key in obj
|
|
: nooverride instanceof Set ?
|
|
nooverride.has(key)
|
|
: nooverride){
|
|
return }
|
|
// proxy...
|
|
obj[key] = promiseProxy(key) })
|
|
proto = proto.__proto__ }
|
|
return obj },
|
|
})
|
|
|
|
|
|
|
|
//---------------------------------------------------------------------
|
|
|
|
var PromiseMixin =
|
|
module.PromiseMixin =
|
|
object.Mixin('PromiseMixin', 'soft', {
|
|
iter: IterablePromise,
|
|
interactive: InteractivePromise,
|
|
cooperative: CooperativePromise,
|
|
})
|
|
|
|
PromiseMixin(Promise)
|
|
|
|
|
|
var PromiseProtoMixin =
|
|
module.PromiseProtoMixin =
|
|
object.Mixin('PromiseProtoMixin', 'soft', {
|
|
as: ProxyPromise,
|
|
iter: function(handler=undefined){
|
|
return IterablePromise(this, handler) },
|
|
})
|
|
|
|
PromiseProtoMixin(Promise.prototype)
|
|
|
|
|
|
|
|
|
|
/**********************************************************************
|
|
* vim:set ts=4 sw=4 nowrap : */ return module })
|