From 117fac91a79a85c1b8261d7c27a4944d26fd50a1 Mon Sep 17 00:00:00 2001
From: Gandalf-the-Bot <gandalfthebot@py.gy>
Date: Mon, 23 Apr 2018 11:54:15 +0000
Subject: [PATCH] Bundled output for commit
 44e165a357050cdfd1a7a278fc3af44839cdf4fe [skip ci]

---
 README.md      |   2 +-
 mithril.js     | 177 ++++++++++++++++++++++++++++---------------------
 mithril.min.js |  90 ++++++++++++-------------
 3 files changed, 148 insertions(+), 121 deletions(-)

diff --git a/README.md b/README.md
index 5b67f110..296c4c32 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ mithril.js [![NPM Version](https://img.shields.io/npm/v/mithril.svg)](https://ww
 
 ## What is Mithril?
 
-A modern client-side Javascript framework for building Single Page Applications. It's small (<!-- size -->8.34 KB<!-- /size --> gzipped), fast and provides routing and XHR utilities out of the box.
+A modern client-side Javascript framework for building Single Page Applications. It's small (<!-- size -->8.30 KB<!-- /size --> gzipped), fast and provides routing and XHR utilities out of the box.
 
 Mithril is used by companies like Vimeo and Nike, and open source platforms like Lichess 👍.
 
diff --git a/mithril.js b/mithril.js
index 769801aa..11b40899 100644
--- a/mithril.js
+++ b/mithril.js
@@ -452,18 +452,17 @@ var coreRenderer = function($window) {
 			vnode.state = {}
 			if (vnode.attrs != null) initLifecycle(vnode.attrs, vnode, hooks)
 			switch (tag) {
-				case "#": return createText(parent, vnode, nextSibling)
-				case "<": return createHTML(parent, vnode, ns, nextSibling)
-				case "[": return createFragment(parent, vnode, hooks, ns, nextSibling)
-				default: return createElement(parent, vnode, hooks, ns, nextSibling)
+				case "#": createText(parent, vnode, nextSibling); break
+				case "<": createHTML(parent, vnode, ns, nextSibling); break
+				case "[": createFragment(parent, vnode, hooks, ns, nextSibling); break
+				default: createElement(parent, vnode, hooks, ns, nextSibling)
 			}
 		}
-		else return createComponent(parent, vnode, hooks, ns, nextSibling)
+		else createComponent(parent, vnode, hooks, ns, nextSibling)
 	}
 	function createText(parent, vnode, nextSibling) {
 		vnode.dom = $doc.createTextNode(vnode.children)
 		insertNode(parent, vnode.dom, nextSibling)
-		return vnode.dom
 	}
 	var possibleParents = {caption: "table", thead: "table", tbody: "table", tfoot: "table", tr: "tbody", th: "tr", td: "tr", colgroup: "table", col: "colgroup"}
 	function createHTML(parent, vnode, ns, nextSibling) {
@@ -488,7 +487,6 @@ var coreRenderer = function($window) {
 			fragment.appendChild(child)
 		}
 		insertNode(parent, fragment, nextSibling)
-		return fragment
 	}
 	function createFragment(parent, vnode, hooks, ns, nextSibling) {
 		var fragment = $doc.createDocumentFragment()
@@ -499,7 +497,6 @@ var coreRenderer = function($window) {
 		vnode.dom = fragment.firstChild
 		vnode.domSize = fragment.childNodes.length
 		insertNode(parent, fragment, nextSibling)
-		return fragment
 	}
 	function createElement(parent, vnode, hooks, ns, nextSibling) {
 		var tag = vnode.tag
@@ -528,7 +525,6 @@ var coreRenderer = function($window) {
 				setLateAttrs(vnode)
 			}
 		}
-		return element
 	}
 	function initComponent(vnode, hooks) {
 		var sentinel
@@ -553,15 +549,12 @@ var coreRenderer = function($window) {
 	function createComponent(parent, vnode, hooks, ns, nextSibling) {
 		initComponent(vnode, hooks)
 		if (vnode.instance != null) {
-			var element = createNode(parent, vnode.instance, hooks, ns, nextSibling)
+			createNode(parent, vnode.instance, hooks, ns, nextSibling)
 			vnode.dom = vnode.instance.dom
 			vnode.domSize = vnode.dom != null ? vnode.instance.domSize : 0
-			insertNode(parent, element, nextSibling)
-			return element
 		}
 		else {
 			vnode.domSize = 0
-			return $emptyFragment
 		}
 	}
 	//update
@@ -588,10 +581,8 @@ var coreRenderer = function($window) {
 	//
 	// The updateNodes() function:
 	// - deals with trivial cases
-	// - determines whether the lists are keyed or unkeyed
-	//   (Currently we look for the first pair of non-null nodes and deem the lists unkeyed
-	//   if both nodes are unkeyed. TODO (v2) We may later take advantage of the fact that
-	//   mixed diff is not supported and settle on the keyedness of the first vnode we find)
+	// - determines whether the lists are keyed or unkeyed based on the first non-null node
+	//   of each list.
 	// - diffs them and patches the DOM if needed (that's the brunt of the code)
 	// - manages the leftovers: after diffing, are there:
 	//   - old nodes left to remove?
@@ -602,13 +593,14 @@ var coreRenderer = function($window) {
 	// are visited in the fourth part of the diff and in the `removeNodes` loop.
 	// ## Diffing
 	//
-	// There's first a simple diff for unkeyed lists of equal length.
+	// If one list is keyed and the other is unkeyed, the old is removed, and the new one is
+	// inserted (since the keys are guaranteed to differ).
 	//
-	// Then comes the main diff algorithm that is split in four parts (simplifying a bit).
+	// Then comes the unkeyed diff algo, and at last0, the keyed diff algorithm that is split
+	// in four parts (simplifying a bit).
 	//
 	// The first part goes through both lists top-down as long as the nodes at each level have
-	// the same key2. This is always true for unkeyed lists that are entirely processed by this
-	// step.
+	// the same key2.
 	//
 	// The second part deals with lists reversals, and traverses one list top-down and the other
 	// bottom-up (as long as the keys match1).
@@ -633,10 +625,23 @@ var coreRenderer = function($window) {
 	// It should be noted that the description of the four sections above is not perfect, because those
 	// parts are actually implemented as only two loops, one for the first two parts, and one for
 	// the other two. I'm1 not sure it wins us anything except maybe a few bytes of file size.
-	// ## DOM node operations
+	// ## Finding the next0 sibling.
 	//
-	// In most cases `updateNode()` and `createNode()` perform the DOM operations. However,
-	// this is not the case if the node moved (second and fourth part of the diff algo).
+	// `updateNode()` and `createNode()` expect a nextSibling parameter to perform DOM operations.
+	// When the list is being traversed top-down, at any index0, the DOM nodes up to the previous
+	// vnode reflect the content of the new list, whereas the rest of the DOM nodes reflect the old
+	// list. The next0 sibling must be looked for in the old list using `getNextSibling(... oldStart + 1 ...)`.
+  //
+	// In the other scenarios (swaps, upwards traversal, map-based diff),
+	// the new vnodes list is traversed upwards. The DOM nodes at the bottom of the list reflect the
+	// bottom part of the new vnodes list, and we can use the `v.dom`  value of the previous node
+	// as the next0 sibling (cached0 in the `nextSibling` variable).
+	// ## DOM node moves
+	//
+	// In most scenarios `updateNode()` and `createNode()` perform the DOM operations. However,
+	// this is not the case if the node moved (second and fourth part of the diff algo). We move
+	// the old DOM nodes before updateNode runs0 because it enables us to use the cached0 `nextSibling`
+	// variable rather than fetching it using `getNextSibling()`.
 	//
 	// The fourth part of the diff currently inserts nodes unconditionally, leading to issues
 	// like #1791 and #1999. We need to be smarter about those situations where adjascent old
@@ -647,83 +652,105 @@ var coreRenderer = function($window) {
 		else if (old == null) createNodes(parent, vnodes, 0, vnodes.length, hooks, nextSibling, ns)
 		else if (vnodes == null) removeNodes(old, 0, old.length)
 		else {
-			var start = 0, commonLength = Math.min(old.length, vnodes.length), isUnkeyed = false
-			for(; start < commonLength; start++) {
-				if (old[start] != null && vnodes[start] != null) {
-					if (old[start].key == null && vnodes[start].key == null) isUnkeyed = true
+			// default to keyed because, when either list is full of null nodes, it has fewer branches
+			var start = 0, oldStart = 0, isOldKeyed = true, isKeyed = true
+			for (; oldStart < old.length; oldStart++) {
+				if (old[oldStart] != null) {
+					isOldKeyed = old[oldStart].key != null
 					break
 				}
 			}
-			if (isUnkeyed && old.length === vnodes.length) {
-				for (start = 0; start < vnodes.length; start++) {
-					if (old[start] === vnodes[start] || old[start] == null && vnodes[start] == null) continue
-					else if (old[start] == null) createNode(parent, vnodes[start], hooks, ns, getNextSibling(old, start + 1, nextSibling))
-					else if (vnodes[start] == null) removeNodes(old, start, start + 1)
-					else updateNode(parent, old[start], vnodes[start], hooks, getNextSibling(old, start + 1, nextSibling), ns)
+			for (; start < vnodes.length; start++) {
+				if (vnodes[start] != null) {
+					isKeyed = vnodes[start].key != null
+					break
 				}
+			}
+			if (isOldKeyed !== isKeyed) {
+				removeNodes(old, oldStart, old.length)
+				createNodes(parent, vnodes, start, vnodes.length, hooks, nextSibling, ns)
 				return
 			}
-			var oldStart = start = 0, oldEnd = old.length - 1, end = vnodes.length - 1, map, o, v
+			if (!isKeyed) {
+				// Don't index0 past the end of either list (causes deopts).
+				var commonLength = old.length < vnodes.length ? old.length : vnodes.length
+				// Rewind if necessary to the first non-null index0 on either side.
+				// We could alternatively either explicitly create or remove nodes when `start !== oldStart`
+				// but that would be optimizing for sparse lists which are more rare than dense ones.
+				start = start < oldStart ? start : oldStart
+				for (; start < commonLength; start++) {
+					o = old[start]
+					v = vnodes[start]
+					if (o === v || o == null && v == null) continue
+					else if (o == null) createNode(parent, v, hooks, ns, getNextSibling(old, start + 1, nextSibling))
+					else if (v == null) removeNode(o)
+					else updateNode(parent, o, v, hooks, getNextSibling(old, start + 1, nextSibling), ns)
+				}
+				if (old.length > commonLength) removeNodes(old, start, old.length)
+				if (vnodes.length > commonLength) createNodes(parent, vnodes, start, vnodes.length, hooks, nextSibling, ns)
+				return
+			}
+			// keyed diff
+			var oldEnd = old.length - 1, end = vnodes.length - 1, map, o, v
 			while (oldEnd >= oldStart && end >= start) {
+				// both top-down
 				o = old[oldStart]
 				v = vnodes[start]
-				if (o === v || o == null && v == null) oldStart++, start++
-				else if (o == null) {
-					if (isUnkeyed || v.key == null) {
-						createNode(parent, vnodes[start], hooks, ns, getNextSibling(old, ++start, nextSibling))
-					}
-					oldStart++
-				} else if (v == null) {
-					if (isUnkeyed || o.key == null) {
-						removeNodes(old, start, start + 1)
-						oldStart++
-					}
-					start++
-				} else if (o.key === v.key) {
+				if (o == null) oldStart++
+				else if (v == null) start++
+				else if (o.key === v.key) {
 					oldStart++, start++
-					updateNode(parent, o, v, hooks, getNextSibling(old, oldStart, nextSibling), ns)
+					if (o !== v) updateNode(parent, o, v, hooks, getNextSibling(old, oldStart, nextSibling), ns)
 				} else {
-					o = old[oldEnd]
-					if (o === v) oldEnd--, start++
-					else if (o == null) oldEnd--
-					else if (v == null) start++
+					// reversal: old top-down, new bottom-up
+					v = vnodes[end]
+					if (o == null) oldStart++
+					else if (v == null) end--
 					else if (o.key === v.key) {
-						updateNode(parent, o, v, hooks, getNextSibling(old, oldEnd + 1, nextSibling), ns)
-						if (start < end) insertNode(parent, toFragment(v), getNextSibling(old, oldStart, nextSibling))
-						oldEnd--, start++
+						oldStart++
+						if (start < end--) insertNode(parent, toFragment(o), nextSibling)
+						if (o !== v) updateNode(parent, o, v, hooks, nextSibling, ns)
+						if (v.dom != null) nextSibling = v.dom
 					}
 					else break
 				}
 			}
 			while (oldEnd >= oldStart && end >= start) {
+				// both bottom-up
 				o = old[oldEnd]
 				v = vnodes[end]
-				if (o === v) oldEnd--, end--
-				else if (o == null) oldEnd--
+				if (o == null) oldEnd--
 				else if (v == null) end--
 				else if (o.key === v.key) {
-					updateNode(parent, o, v, hooks, getNextSibling(old, oldEnd + 1, nextSibling), ns)
-					if (o.dom != null) nextSibling = o.dom
+					if (o !== v) updateNode(parent, o, v, hooks, nextSibling, ns)
+					if (v.dom != null) nextSibling = v.dom
 					oldEnd--, end--
 				} else {
-					if (!map) map = getKeyMap(old, oldEnd)
+					// old map-based, new bottom-up
+					if (map == null) {
+						// the last0 node can be left out of the map because it will be caught by the
+						// bottom-up part of the diff loop. If we were to refactor this to use distinct
+						// loops, we'd have to pass `oldEnd + 1` (or change `start < end` to `<=` in getKeyMap).
+						map = getKeyMap(old, oldStart, oldEnd)
+					}
 					if (v != null) {
 						var oldIndex = map[v.key]
-						if (oldIndex != null) {
-							o = old[oldIndex]
-							updateNode(parent, o, v, hooks, getNextSibling(old, oldEnd + 1, nextSibling), ns)
-							insertNode(parent, toFragment(v), nextSibling)
-							o.skip = true
-							if (o.dom != null) nextSibling = o.dom
+						if (oldIndex == null) {
+							createNode(parent, v, hooks, ns, nextSibling)
+							if (v.dom != null) nextSibling = v.dom
 						} else {
-							var dom = createNode(parent, v, hooks, ns, nextSibling)
-							nextSibling = dom
+							o = old[oldIndex]
+							insertNode(parent, toFragment(o), nextSibling)
+							if (o !== v) updateNode(parent, o, v, hooks, nextSibling, ns)
+							o.skip = true
+							if (v.dom != null) nextSibling = v.dom
 						}
 					}
 					end--
 				}
 				if (end < start) break
 			}
+			// deal with the leftovers.
 			createNodes(parent, vnodes, start, end + 1, hooks, nextSibling, ns)
 			removeNodes(old, oldStart, oldEnd + 1)
 		}
@@ -824,13 +851,13 @@ var coreRenderer = function($window) {
 			vnode.domSize = old.domSize
 		}
 	}
-	function getKeyMap(vnodes, end) {
-		var map = {}, i = 0
-		for (var i = 0; i < end; i++) {
-			var vnode = vnodes[i]
+	function getKeyMap(vnodes, start, end) {
+		var map = {}
+		for (; start < end; start++) {
+			var vnode = vnodes[start]
 			if (vnode != null) {
 				var key2 = vnode.key
-				if (key2 != null) map[key2] = i
+				if (key2 != null) map[key2] = start
 			}
 		}
 		return map
@@ -855,7 +882,7 @@ var coreRenderer = function($window) {
 		return nextSibling
 	}
 	function insertNode(parent, dom, nextSibling) {
-		if (nextSibling) parent.insertBefore(dom, nextSibling)
+		if (nextSibling != null) parent.insertBefore(dom, nextSibling)
 		else parent.appendChild(dom)
 	}
 	function setContentEditable(vnode) {
diff --git a/mithril.min.js b/mithril.min.js
index d34e10e7..67c396ce 100644
--- a/mithril.min.js
+++ b/mithril.min.js
@@ -1,45 +1,45 @@
-(function(){function w(a,b,f,g,r,l){return{tag:a,key:b,attrs:f,children:g,text:r,dom:l,domSize:void 0,state:void 0,events:void 0,instance:void 0,skip:!1}}function N(a){for(var b in a)if(B.call(a,b))return!1;return!0}function u(a){var b=arguments[1],f=2;if(null==a||"string"!==typeof a&&"function"!==typeof a&&"function"!==typeof a.view)throw Error("The selector must be either a string or a component.");if("string"===typeof a){var g;if(!(g=O[a])){var r="div";for(var l=[],k={};g=R.exec(a);){var m=g[1],
-t=g[2];""===m&&""!==t?r=t:"#"===m?k.id=t:"."===m?l.push(t):"["===g[3][0]&&((m=g[6])&&(m=m.replace(/\\(["'])/g,"$1").replace(/\\\\/g,"\\")),"class"===g[4]?l.push(m):k[g[4]]=""===m?m:m||!0)}0<l.length&&(k.className=l.join(" "));g=O[a]={tag:r,attrs:k}}}if(null==b)b={};else if("object"!==typeof b||null!=b.tag||Array.isArray(b))b={},f=1;if(arguments.length===f+1)r=arguments[f],Array.isArray(r)||(r=[r]);else for(r=[];f<arguments.length;)r.push(arguments[f++]);f=w.normalizeChildren(r);if("string"===typeof a){r=
-!1;var e,y;l=b.className||b["class"];if(!N(g.attrs)&&!N(b)){k={};for(var d in b)B.call(b,d)&&(k[d]=b[d]);b=k}for(d in g.attrs)B.call(g.attrs,d)&&(b[d]=g.attrs[d]);void 0!==l&&(void 0!==b["class"]&&(b["class"]=void 0,b.className=l),null!=g.attrs.className&&(b.className=g.attrs.className+" "+l));for(d in b)if(B.call(b,d)&&"key"!==d){r=!0;break}Array.isArray(f)&&1===f.length&&null!=f[0]&&"#"===f[0].tag?y=f[0].children:e=f;return w(g.tag,b.key,r?b:void 0,e,y)}return w(a,b.key,b,f)}function S(a){var b=
-0,f=null,g="function"===typeof requestAnimationFrame?requestAnimationFrame:setTimeout;return function(){var r=Date.now()-b;null===f&&(f=g(function(){f=null;a();b=Date.now()},16-r))}}w.normalize=function(a){return Array.isArray(a)?w("[",void 0,void 0,w.normalizeChildren(a),void 0,void 0):null!=a&&"object"!==typeof a?w("#",void 0,void 0,!1===a?"":a,void 0,void 0):a};w.normalizeChildren=function(a){for(var b=0;b<a.length;b++)a[b]=w.normalize(a[b]);return a};var R=/(?:(^|#|\.)([^#\.\[\]]+))|(\[(.+?)(?:\s*=\s*("|'|)((?:\\["'\]]|.)*?)\5)?\])/g,
-O={},B={}.hasOwnProperty;u.trust=function(a){null==a&&(a="");return w("<",void 0,void 0,a,void 0,void 0)};u.fragment=function(a,b){return w("[",a.key,a,w.normalizeChildren(b),void 0,void 0)};var h=function(a){function b(a,d){return function H(b){var x;try{if(!d||null==b||"object"!==typeof b&&"function"!==typeof b||"function"!==typeof(x=b.then))e(function(){d||0!==a.length||console.error("Possible unhandled promise rejection:",b);for(var f=0;f<a.length;f++)a[f](b);r.length=0;l.length=0;t.state=d;t.retry=
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-h.resolve=function(a){return a instanceof h?a:new h(function(b){b(a)})};h.reject=function(a){return new h(function(b,f){f(a)})};h.all=function(a){return new h(function(b,f){var g=a.length,r=0,l=[];if(0===a.length)b([]);else for(var k=0;k<a.length;k++)(function(m){function t(a){r++;l[m]=a;r===g&&b(l)}null==a[m]||"object"!==typeof a[m]&&"function"!==typeof a[m]||"function"!==typeof a[m].then?t(a[m]):a[m].then(t,f)})(k)})};h.race=function(a){return new h(function(b,f){for(var g=0;g<a.length;g++)a[g].then(b,
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