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| author | ruki <waruqi@gmail.com> | 2018-11-08 00:38:48 +0800 |
|---|---|---|
| committer | ruki <waruqi@gmail.com> | 2018-11-07 21:53:09 +0800 |
| commit | 26105034da4fcce7ac883c899d781f016559310d (patch) | |
| tree | c459a5dc4e3aa0972d9919033ece511ce76dd129 /node_modules/when/lib/decorators/iterate.js | |
| parent | 2c77f00f1a7ecb6c8192f9c16d3b2001b254a107 (diff) | |
| download | xmake-docs-26105034da4fcce7ac883c899d781f016559310d.tar.gz xmake-docs-26105034da4fcce7ac883c899d781f016559310d.zip | |
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Diffstat (limited to 'node_modules/when/lib/decorators/iterate.js')
| -rw-r--r-- | node_modules/when/lib/decorators/iterate.js | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/node_modules/when/lib/decorators/iterate.js b/node_modules/when/lib/decorators/iterate.js new file mode 100644 index 00000000..3ea70b3c --- /dev/null +++ b/node_modules/when/lib/decorators/iterate.js @@ -0,0 +1,65 @@ +/** @license MIT License (c) copyright 2010-2014 original author or authors */ +/** @author Brian Cavalier */ +/** @author John Hann */ + +(function(define) { 'use strict'; +define(function() { + + return function generate(Promise) { + + var resolve = Promise.resolve; + + Promise.iterate = iterate; + Promise.unfold = unfold; + + return Promise; + + /** + * @deprecated Use github.com/cujojs/most streams and most.iterate + * Generate a (potentially infinite) stream of promised values: + * x, f(x), f(f(x)), etc. until condition(x) returns true + * @param {function} f function to generate a new x from the previous x + * @param {function} condition function that, given the current x, returns + * truthy when the iterate should stop + * @param {function} handler function to handle the value produced by f + * @param {*|Promise} x starting value, may be a promise + * @return {Promise} the result of the last call to f before + * condition returns true + */ + function iterate(f, condition, handler, x) { + return unfold(function(x) { + return [x, f(x)]; + }, condition, handler, x); + } + + /** + * @deprecated Use github.com/cujojs/most streams and most.unfold + * Generate a (potentially infinite) stream of promised values + * by applying handler(generator(seed)) iteratively until + * condition(seed) returns true. + * @param {function} unspool function that generates a [value, newSeed] + * given a seed. + * @param {function} condition function that, given the current seed, returns + * truthy when the unfold should stop + * @param {function} handler function to handle the value produced by unspool + * @param x {*|Promise} starting value, may be a promise + * @return {Promise} the result of the last value produced by unspool before + * condition returns true + */ + function unfold(unspool, condition, handler, x) { + return resolve(x).then(function(seed) { + return resolve(condition(seed)).then(function(done) { + return done ? seed : resolve(unspool(seed)).spread(next); + }); + }); + + function next(item, newSeed) { + return resolve(handler(item)).then(function() { + return unfold(unspool, condition, handler, newSeed); + }); + } + } + }; + +}); +}(typeof define === 'function' && define.amd ? define : function(factory) { module.exports = factory(); })); |
