X-Git-Url: https://pwan.org/git/?p=tech-radar.git;a=blobdiff_plain;f=examples%2Fd3-queue.js;fp=examples%2Fd3-queue.js;h=ad12b6db7191f54787035471f55817149013f8f7;hp=0000000000000000000000000000000000000000;hb=f44fe53f633b819c969a3894e9dc9c77ef343434;hpb=a4111b43d131f4eac44415d99fbdef6aad0b4d3a

diff --git a/examples/d3-queue.js b/examples/d3-queue.js
new file mode 100644
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--- /dev/null
+++ b/examples/d3-queue.js
@@ -0,0 +1,130 @@
+// https://d3js.org/d3-queue/ Version 3.0.5. Copyright 2017 Mike Bostock.
+(function (global, factory) {
+	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
+	typeof define === 'function' && define.amd ? define(['exports'], factory) :
+	(factory((global.d3 = global.d3 || {})));
+}(this, (function (exports) { 'use strict';
+
+var slice = [].slice;
+
+var noabort = {};
+
+function Queue(size) {
+  if (!(size >= 1)) throw new Error;
+  this._size = size;
+  this._call =
+  this._error = null;
+  this._tasks = [];
+  this._data = [];
+  this._waiting =
+  this._active =
+  this._ended =
+  this._start = 0; // inside a synchronous task callback?
+}
+
+Queue.prototype = queue.prototype = {
+  constructor: Queue,
+  defer: function(callback) {
+    if (typeof callback !== "function" || this._call) throw new Error;
+    if (this._error != null) return this;
+    var t = slice.call(arguments, 1);
+    t.push(callback);
+    ++this._waiting, this._tasks.push(t);
+    poke(this);
+    return this;
+  },
+  abort: function() {
+    if (this._error == null) abort(this, new Error("abort"));
+    return this;
+  },
+  await: function(callback) {
+    if (typeof callback !== "function" || this._call) throw new Error;
+    this._call = function(error, results) { callback.apply(null, [error].concat(results)); };
+    maybeNotify(this);
+    return this;
+  },
+  awaitAll: function(callback) {
+    if (typeof callback !== "function" || this._call) throw new Error;
+    this._call = callback;
+    maybeNotify(this);
+    return this;
+  }
+};
+
+function poke(q) {
+  if (!q._start) {
+    try { start(q); } // let the current task complete
+    catch (e) {
+      if (q._tasks[q._ended + q._active - 1]) abort(q, e); // task errored synchronously
+      else if (!q._data) throw e; // await callback errored synchronously
+    }
+  }
+}
+
+function start(q) {
+  while (q._start = q._waiting && q._active < q._size) {
+    var i = q._ended + q._active,
+        t = q._tasks[i],
+        j = t.length - 1,
+        c = t[j];
+    t[j] = end(q, i);
+    --q._waiting, ++q._active;
+    t = c.apply(null, t);
+    if (!q._tasks[i]) continue; // task finished synchronously
+    q._tasks[i] = t || noabort;
+  }
+}
+
+function end(q, i) {
+  return function(e, r) {
+    if (!q._tasks[i]) return; // ignore multiple callbacks
+    --q._active, ++q._ended;
+    q._tasks[i] = null;
+    if (q._error != null) return; // ignore secondary errors
+    if (e != null) {
+      abort(q, e);
+    } else {
+      q._data[i] = r;
+      if (q._waiting) poke(q);
+      else maybeNotify(q);
+    }
+  };
+}
+
+function abort(q, e) {
+  var i = q._tasks.length, t;
+  q._error = e; // ignore active callbacks
+  q._data = undefined; // allow gc
+  q._waiting = NaN; // prevent starting
+
+  while (--i >= 0) {
+    if (t = q._tasks[i]) {
+      q._tasks[i] = null;
+      if (t.abort) {
+        try { t.abort(); }
+        catch (e) { /* ignore */ }
+      }
+    }
+  }
+
+  q._active = NaN; // allow notification
+  maybeNotify(q);
+}
+
+function maybeNotify(q) {
+  if (!q._active && q._call) {
+    var d = q._data;
+    q._data = undefined; // allow gc
+    q._call(q._error, d);
+  }
+}
+
+function queue(concurrency) {
+  return new Queue(arguments.length ? +concurrency : Infinity);
+}
+
+exports.queue = queue;
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+})));