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mithril.js
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mithril.js
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var m = (function app(window, undefined) {
"use strict";
var VERSION = "v0.2.2-rc.1";
function isFunction(object) {
return typeof object === "function";
}
function isObject(object) {
return type.call(object) === "[object Object]";
}
function isString(object) {
return type.call(object) === "[object String]";
}
var isArray = Array.isArray || function (object) {
return type.call(object) === "[object Array]";
};
var type = {}.toString;
var parser = /(?:(^|#|\.)([^#\.\[\]]+))|(\[.+?\])/g, attrParser = /\[(.+?)(?:=("|'|)(.*?)\2)?\]/;
var voidElements = /^(AREA|BASE|BR|COL|COMMAND|EMBED|HR|IMG|INPUT|KEYGEN|LINK|META|PARAM|SOURCE|TRACK|WBR)$/;
var noop = function () {};
// caching commonly used variables
var $document, $location, $requestAnimationFrame, $cancelAnimationFrame;
// self invoking function needed because of the way mocks work
function initialize(window) {
$document = window.document;
$location = window.location;
$cancelAnimationFrame = window.cancelAnimationFrame || window.clearTimeout;
$requestAnimationFrame = window.requestAnimationFrame || window.setTimeout;
}
initialize(window);
m.version = function() {
return VERSION;
};
/**
* @typedef {String} Tag
* A string that looks like -> div.classname#id[param=one][param2=two]
* Which describes a DOM node
*/
/**
*
* @param {Tag} The DOM node tag
* @param {Object=[]} optional key-value pairs to be mapped to DOM attrs
* @param {...mNode=[]} Zero or more Mithril child nodes. Can be an array, or splat (optional)
*
*/
function m(tag, pairs) {
for (var args = [], i = 1; i < arguments.length; i++) {
args[i - 1] = arguments[i];
}
if (isObject(tag)) return parameterize(tag, args);
var hasAttrs = pairs != null && isObject(pairs) && !("tag" in pairs || "view" in pairs || "subtree" in pairs);
var attrs = hasAttrs ? pairs : {};
var classAttrName = "class" in attrs ? "class" : "className";
var cell = {tag: "div", attrs: {}};
var match, classes = [];
if (!isString(tag)) throw new Error("selector in m(selector, attrs, children) should be a string");
while ((match = parser.exec(tag)) != null) {
if (match[1] === "" && match[2]) cell.tag = match[2];
else if (match[1] === "#") cell.attrs.id = match[2];
else if (match[1] === ".") classes.push(match[2]);
else if (match[3][0] === "[") {
var pair = attrParser.exec(match[3]);
cell.attrs[pair[1]] = pair[3] || (pair[2] ? "" :true);
}
}
var children = hasAttrs ? args.slice(1) : args;
if (children.length === 1 && isArray(children[0])) {
cell.children = children[0];
}
else {
cell.children = children;
}
for (var attrName in attrs) {
if (attrs.hasOwnProperty(attrName)) {
if (attrName === classAttrName && attrs[attrName] != null && attrs[attrName] !== "") {
classes.push(attrs[attrName]);
cell.attrs[attrName] = ""; //create key in correct iteration order
}
else cell.attrs[attrName] = attrs[attrName];
}
}
if (classes.length) cell.attrs[classAttrName] = classes.join(" ");
return cell;
}
function forEach(list, f) {
for (var i = 0; i < list.length && !f(list[i], i++);) {}
}
function forKeys(list, f) {
forEach(list, function (attrs, i) {
return (attrs = attrs && attrs.attrs) && attrs.key != null && f(attrs, i);
});
}
// This function was causing deopts in Chrome.
function dataToString(data) {
//data.toString() might throw or return null if data is the return value of Console.log in Firefox (behavior depends on version)
try {
if (data == null || data.toString() == null) return "";
} catch (e) {
return "";
}
return data;
}
// This function was causing deopts in Chrome.
function injectTextNode(parentElement, first, index, data) {
try {
insertNode(parentElement, first, index);
first.nodeValue = data;
} catch (e) {} //IE erroneously throws error when appending an empty text node after a null
}
function flatten(list) {
//recursively flatten array
for (var i = 0; i < list.length; i++) {
if (isArray(list[i])) {
list = list.concat.apply([], list);
//check current index again and flatten until there are no more nested arrays at that index
i--;
}
}
return list;
}
function insertNode(parentElement, node, index) {
parentElement.insertBefore(node, parentElement.childNodes[index] || null);
}
var DELETION = 1, INSERTION = 2, MOVE = 3;
function handleKeysDiffer(data, existing, cached, parentElement) {
forKeys(data, function (key, i) {
existing[key = key.key] = existing[key] ? {
action: MOVE,
index: i,
from: existing[key].index,
element: cached.nodes[existing[key].index] || $document.createElement("div")
} : {action: INSERTION, index: i};
});
var actions = [];
for (var prop in existing) actions.push(existing[prop]);
var changes = actions.sort(sortChanges), newCached = new Array(cached.length);
newCached.nodes = cached.nodes.slice();
forEach(changes, function (change) {
var index = change.index;
if (change.action === DELETION) {
clear(cached[index].nodes, cached[index]);
newCached.splice(index, 1);
}
if (change.action === INSERTION) {
var dummy = $document.createElement("div");
dummy.key = data[index].attrs.key;
insertNode(parentElement, dummy, index);
newCached.splice(index, 0, {
attrs: {key: data[index].attrs.key},
nodes: [dummy]
});
newCached.nodes[index] = dummy;
}
if (change.action === MOVE) {
var changeElement = change.element;
var maybeChanged = parentElement.childNodes[index];
if (maybeChanged !== changeElement && changeElement !== null) {
parentElement.insertBefore(changeElement, maybeChanged || null);
}
newCached[index] = cached[change.from];
newCached.nodes[index] = changeElement;
}
});
return newCached;
}
function diffKeys(data, cached, existing, parentElement) {
var keysDiffer = data.length !== cached.length;
if (!keysDiffer) {
forKeys(data, function (attrs, i) {
var cachedCell = cached[i];
return keysDiffer = cachedCell && cachedCell.attrs && cachedCell.attrs.key !== attrs.key;
});
}
return keysDiffer ? handleKeysDiffer(data, existing, cached, parentElement) : cached;
}
function diffArray(data, cached, nodes) {
//diff the array itself
//update the list of DOM nodes by collecting the nodes from each item
forEach(data, function (_, i) {
if (cached[i] != null) nodes.push.apply(nodes, cached[i].nodes);
})
//remove items from the end of the array if the new array is shorter than the old one. if errors ever happen here, the issue is most likely
//a bug in the construction of the `cached` data structure somewhere earlier in the program
forEach(cached.nodes, function (node, i) {
if (node.parentNode != null && nodes.indexOf(node) < 0) clear([node], [cached[i]]);
})
if (data.length < cached.length) cached.length = data.length;
cached.nodes = nodes;
}
function buildArrayKeys(data) {
var guid = 0;
forKeys(data, function () {
forEach(data, function (attrs) {
if ((attrs = attrs && attrs.attrs) && attrs.key == null) attrs.key = "__mithril__" + guid++;
})
return 1;
});
}
function maybeRecreateObject(data, cached, dataAttrKeys) {
//if an element is different enough from the one in cache, recreate it
if (data.tag !== cached.tag ||
dataAttrKeys.sort().join() !== Object.keys(cached.attrs).sort().join() ||
data.attrs.id !== cached.attrs.id ||
data.attrs.key !== cached.attrs.key ||
(m.redraw.strategy() === "all" && (!cached.configContext || cached.configContext.retain !== true)) ||
(m.redraw.strategy() === "diff" && cached.configContext && cached.configContext.retain === false)) {
if (cached.nodes.length) clear(cached.nodes);
if (cached.configContext && isFunction(cached.configContext.onunload)) cached.configContext.onunload();
if (cached.controllers) {
forEach(cached.controllers, function (controller) {
if (controller.unload) controller.onunload({preventDefault: noop});
});
}
}
}
function getObjectNamespace(data, namespace) {
return data.attrs.xmlns ? data.attrs.xmlns :
data.tag === "svg" ? "http://www.w3.org/2000/svg" :
data.tag === "math" ? "http://www.w3.org/1998/Math/MathML" :
namespace;
}
function unloadCachedControllers(cached, views, controllers) {
if (controllers.length) {
cached.views = views;
cached.controllers = controllers;
forEach(controllers, function (controller) {
if (controller.onunload && controller.onunload.$old) controller.onunload = controller.onunload.$old;
if (pendingRequests && controller.onunload) {
var onunload = controller.onunload;
controller.onunload = noop;
controller.onunload.$old = onunload;
}
});
}
}
function scheduleConfigsToBeCalled(configs, data, node, isNew, cached) {
//schedule configs to be called. They are called after `build`
//finishes running
if (isFunction(data.attrs.config)) {
var context = cached.configContext = cached.configContext || {};
//bind
configs.push(function() {
return data.attrs.config.call(data, node, !isNew, context, cached);
});
}
}
function buildUpdatedNode(cached, data, editable, hasKeys, namespace, views, configs, controllers) {
var node = cached.nodes[0];
if (hasKeys) setAttributes(node, data.tag, data.attrs, cached.attrs, namespace);
cached.children = build(node, data.tag, undefined, undefined, data.children, cached.children, false, 0, data.attrs.contenteditable ? node : editable, namespace, configs);
cached.nodes.intact = true;
if (controllers.length) {
cached.views = views;
cached.controllers = controllers;
}
return node;
}
function handleNonexistentNodes(data, parentElement, index) {
var nodes;
if (data.$trusted) {
nodes = injectHTML(parentElement, index, data);
}
else {
nodes = [$document.createTextNode(data)];
if (!parentElement.nodeName.match(voidElements)) insertNode(parentElement, nodes[0], index);
}
var cached = typeof data === "string" || typeof data === "number" || typeof data === "boolean" ? new data.constructor(data) : data;
cached.nodes = nodes;
return cached;
}
function reattachNodes(data, cached, parentElement, editable, index, parentTag) {
var nodes = cached.nodes;
if (!editable || editable !== $document.activeElement) {
if (data.$trusted) {
clear(nodes, cached)
nodes = injectHTML(parentElement, index, data)
} else if (parentTag === "textarea") {
// <textarea> uses `value` instead of `nodeValue`.
parentElement.value = data
} else if (editable) {
// contenteditable nodes use `innerHTML` instead of `nodeValue`.
editable.innerHTML = data
} else {
// was a trusted string
if (nodes[0].nodeType === 1 || nodes.length > 1 || (nodes[0].nodeValue.trim && !nodes[0].nodeValue.trim())) {
clear(cached.nodes, cached)
nodes = [$document.createTextNode(data)]
}
injectTextNode(parentElement, nodes[0], index, data);
}
}
cached = new data.constructor(data);
cached.nodes = nodes;
return cached;
}
function handleText(cached, data, index, parentElement, shouldReattach, editable, parentTag) {
//handle text nodes
return cached.nodes.length === 0 ? handleNonexistentNodes(data, parentElement, index) :
cached.valueOf() !== data.valueOf() || shouldReattach === true ?
reattachNodes(data, cached, parentElement, editable, index, parentTag) :
(cached.nodes.intact = true, cached);
}
function getSubArrayCount(item) {
if (item.$trusted) {
//fix offset of next element if item was a trusted string w/ more than one html element
//the first clause in the regexp matches elements
//the second clause (after the pipe) matches text nodes
var match = item.match(/<[^\/]|\>\s*[^<]/g);
if (match != null) return match.length;
}
else if (isArray(item)) {
return item.length;
}
return 1;
}
function buildArray(data, cached, parentElement, index, parentTag, shouldReattach, editable, namespace, configs) {
data = flatten(data);
var nodes = [], intact = cached.length === data.length, subArrayCount = 0;
//keys algorithm: sort elements without recreating them if keys are present
//1) create a map of all existing keys, and mark all for deletion
//2) add new keys to map and mark them for addition
//3) if key exists in new list, change action from deletion to a move
//4) for each key, handle its corresponding action as marked in previous steps
var existing = {}, shouldMaintainIdentities = false;
forKeys(cached, function (attrs, i) {
shouldMaintainIdentities = true;
existing[cached[i].attrs.key] = {action: DELETION, index: i};
});
buildArrayKeys(data);
if (shouldMaintainIdentities) cached = diffKeys(data, cached, existing, parentElement);
//end key algorithm
var cacheCount = 0;
//faster explicitly written
for (var i = 0, len = data.length; i < len; i++) {
//diff each item in the array
var item = build(parentElement, parentTag, cached, index, data[i], cached[cacheCount], shouldReattach, index + subArrayCount || subArrayCount, editable, namespace, configs);
if (item !== undefined) {
intact = intact && item.nodes.intact;
subArrayCount += getSubArrayCount(item);
cached[cacheCount++] = item;
}
}
if (!intact) diffArray(data, cached, nodes);
return cached
}
function makeCache(data, cached, index, parentIndex, parentCache) {
if (cached != null) {
if (type.call(cached) === type.call(data)) return cached;
if (parentCache && parentCache.nodes) {
var offset = index - parentIndex, end = offset + (isArray(data) ? data : cached.nodes).length;
clear(parentCache.nodes.slice(offset, end), parentCache.slice(offset, end));
} else if (cached.nodes) {
clear(cached.nodes, cached);
}
}
cached = new data.constructor();
//if constructor creates a virtual dom element, use a blank object
//as the base cached node instead of copying the virtual el (#277)
if (cached.tag) cached = {};
cached.nodes = [];
return cached;
}
function constructNode(data, namespace) {
return namespace === undefined ?
data.attrs.is ? $document.createElement(data.tag, data.attrs.is) : $document.createElement(data.tag) :
data.attrs.is ? $document.createElementNS(namespace, data.tag, data.attrs.is) : $document.createElementNS(namespace, data.tag);
}
function constructAttrs(data, node, namespace, hasKeys) {
return hasKeys ? setAttributes(node, data.tag, data.attrs, {}, namespace) : data.attrs;
}
function constructChildren(data, node, cached, editable, namespace, configs) {
return data.children != null && data.children.length > 0 ?
build(node, data.tag, undefined, undefined, data.children, cached.children, true, 0, data.attrs.contenteditable ? node : editable, namespace, configs) :
data.children;
}
function reconstructCached(data, attrs, children, node, namespace, views, controllers) {
var cached = {tag: data.tag, attrs: attrs, children: children, nodes: [node]};
unloadCachedControllers(cached, views, controllers);
if (cached.children && !cached.children.nodes) cached.children.nodes = [];
//edge case: setting value on <select> doesn't work before children exist, so set it again after children have been created
if (data.tag === "select" && "value" in data.attrs) setAttributes(node, data.tag, {value: data.attrs.value}, {}, namespace);
return cached
}
function getController(views, view, cachedControllers, controller) {
var controllerIndex = m.redraw.strategy() === "diff" && views ? views.indexOf(view) : -1;
return controllerIndex > -1 ? cachedControllers[controllerIndex] :
typeof controller === "function" ? new controller() : {};
}
function updateLists(views, controllers, view, controller) {
if (controller.onunload != null) unloaders.push({controller: controller, handler: controller.onunload});
views.push(view);
controllers.push(controller);
}
function checkView(data, view, cached, cachedControllers, controllers, views) {
var controller = getController(cached.views, view, cachedControllers, data.controller);
//Faster to coerce to number and check for NaN
var key = +(data && data.attrs && data.attrs.key);
data = pendingRequests === 0 || forcing || cachedControllers && cachedControllers.indexOf(controller) > -1 ? data.view(controller) : {tag: "placeholder"};
if (data.subtree === "retain") return cached;
if (key === key) (data.attrs = data.attrs || {}).key = key;
updateLists(views, controllers, view, controller);
return data;
}
function markViews(data, cached, views, controllers) {
var cachedControllers = cached && cached.controllers;
while (data.view != null) data = checkView(data, data.view.$original || data.view, cached, cachedControllers, controllers, views);
return data;
}
function buildObject(data, cached, editable, parentElement, index, shouldReattach, namespace, configs) {
var views = [], controllers = [];
data = markViews(data, cached, views, controllers);
if (!data.tag && controllers.length) throw new Error("Component template must return a virtual element, not an array, string, etc.");
data.attrs = data.attrs || {};
cached.attrs = cached.attrs || {};
var dataAttrKeys = Object.keys(data.attrs);
var hasKeys = dataAttrKeys.length > ("key" in data.attrs ? 1 : 0);
maybeRecreateObject(data, cached, dataAttrKeys);
if (!isString(data.tag)) return;
var isNew = cached.nodes.length === 0;
namespace = getObjectNamespace(data, namespace);
var node;
if (isNew) {
node = constructNode(data, namespace);
//set attributes first, then create children
var attrs = constructAttrs(data, node, namespace, hasKeys)
var children = constructChildren(data, node, cached, editable, namespace, configs);
cached = reconstructCached(data, attrs, children, node, namespace, views, controllers);
}
else {
node = buildUpdatedNode(cached, data, editable, hasKeys, namespace, views, configs, controllers);
}
if (isNew || shouldReattach === true && node != null) insertNode(parentElement, node, index);
//schedule configs to be called. They are called after `build`
//finishes running
scheduleConfigsToBeCalled(configs, data, node, isNew, cached);
return cached
}
function build(parentElement, parentTag, parentCache, parentIndex, data, cached, shouldReattach, index, editable, namespace, configs) {
//`build` is a recursive function that manages creation/diffing/removal
//of DOM elements based on comparison between `data` and `cached`
//the diff algorithm can be summarized as this:
//1 - compare `data` and `cached`
//2 - if they are different, copy `data` to `cached` and update the DOM
// based on what the difference is
//3 - recursively apply this algorithm for every array and for the
// children of every virtual element
//the `cached` data structure is essentially the same as the previous
//redraw's `data` data structure, with a few additions:
//- `cached` always has a property called `nodes`, which is a list of
// DOM elements that correspond to the data represented by the
// respective virtual element
//- in order to support attaching `nodes` as a property of `cached`,
// `cached` is *always* a non-primitive object, i.e. if the data was
// a string, then cached is a String instance. If data was `null` or
// `undefined`, cached is `new String("")`
//- `cached also has a `configContext` property, which is the state
// storage object exposed by config(element, isInitialized, context)
//- when `cached` is an Object, it represents a virtual element; when
// it's an Array, it represents a list of elements; when it's a
// String, Number or Boolean, it represents a text node
//`parentElement` is a DOM element used for W3C DOM API calls
//`parentTag` is only used for handling a corner case for textarea
//values
//`parentCache` is used to remove nodes in some multi-node cases
//`parentIndex` and `index` are used to figure out the offset of nodes.
//They're artifacts from before arrays started being flattened and are
//likely refactorable
//`data` and `cached` are, respectively, the new and old nodes being
//diffed
//`shouldReattach` is a flag indicating whether a parent node was
//recreated (if so, and if this node is reused, then this node must
//reattach itself to the new parent)
//`editable` is a flag that indicates whether an ancestor is
//contenteditable
//`namespace` indicates the closest HTML namespace as it cascades down
//from an ancestor
//`configs` is a list of config functions to run after the topmost
//`build` call finishes running
//there's logic that relies on the assumption that null and undefined
//data are equivalent to empty strings
//- this prevents lifecycle surprises from procedural helpers that mix
// implicit and explicit return statements (e.g.
// function foo() {if (cond) return m("div")}
//- it simplifies diffing code
data = dataToString(data);
if (data.subtree === "retain") return cached;
cached = makeCache(data, cached, index, parentIndex, parentCache);
return isArray(data) ? buildArray(data, cached, parentElement, index, parentTag, shouldReattach, editable, namespace, configs) :
data != null && isObject(data) ? buildObject(data, cached, editable, parentElement, index, shouldReattach, namespace, configs) :
!isFunction(data) ? handleText(cached, data, index, parentElement, shouldReattach, editable, parentTag) :
cached;
}
function sortChanges(a, b) { return a.action - b.action || a.index - b.index; }
function setAttributes(node, tag, dataAttrs, cachedAttrs, namespace) {
for (var attrName in dataAttrs) {
var dataAttr = dataAttrs[attrName];
var cachedAttr = cachedAttrs[attrName];
if (!(attrName in cachedAttrs) || (cachedAttr !== dataAttr)) {
cachedAttrs[attrName] = dataAttr;
try {
//`config` isn't a real attributes, so ignore it
if (attrName === "config" || attrName === "key") continue;
//hook event handlers to the auto-redrawing system
else if (isFunction(dataAttr) && attrName.slice(0, 2) === "on") {
node[attrName] = autoredraw(dataAttr, node);
}
//handle `style: {...}`
else if (attrName === "style" && dataAttr != null && isObject(dataAttr)) {
for (var rule in dataAttr) {
if (cachedAttr == null || cachedAttr[rule] !== dataAttr[rule]) node.style[rule] = dataAttr[rule];
}
for (var rule in cachedAttr) {
if (!(rule in dataAttr)) node.style[rule] = "";
}
}
//handle SVG
else if (namespace != null) {
if (attrName === "href") node.setAttributeNS("http://www.w3.org/1999/xlink", "href", dataAttr);
else node.setAttribute(attrName === "className" ? "class" : attrName, dataAttr);
}
//handle cases that are properties (but ignore cases where we should use setAttribute instead)
//- list and form are typically used as strings, but are DOM element references in js
//- when using CSS selectors (e.g. `m("[style='']")`), style is used as a string, but it's an object in js
else if (attrName in node && attrName !== "list" && attrName !== "style" && attrName !== "form" && attrName !== "type" && attrName !== "width" && attrName !== "height") {
//#348 don't set the value if not needed otherwise cursor placement breaks in Chrome
if (tag !== "input" || node[attrName] !== dataAttr) node[attrName] = dataAttr;
}
else node.setAttribute(attrName, dataAttr);
}
catch (e) {
//swallow IE's invalid argument errors to mimic HTML's fallback-to-doing-nothing-on-invalid-attributes behavior
if (e.message.indexOf("Invalid argument") < 0) throw e;
}
}
//#348 dataAttr may not be a string, so use loose comparison (double equal) instead of strict (triple equal)
else if (attrName === "value" && tag === "input" && node.value != dataAttr) {
node.value = dataAttr;
}
}
return cachedAttrs;
}
function clear(nodes, cached) {
for (var i = nodes.length - 1; i > -1; i--) {
if (nodes[i] && nodes[i].parentNode) {
try { nodes[i].parentNode.removeChild(nodes[i]); }
catch (e) {} //ignore if this fails due to order of events (see http://stackoverflow.com/questions/21926083/failed-to-execute-removechild-on-node)
cached = [].concat(cached);
if (cached[i]) unload(cached[i]);
}
}
//release memory if nodes is an array. This check should fail if nodes is a NodeList (see loop above)
if (nodes.length) nodes.length = 0;
}
function unload(cached) {
if (cached.configContext && isFunction(cached.configContext.onunload)) {
cached.configContext.onunload();
cached.configContext.onunload = null;
}
if (cached.controllers) {
forEach(cached.controllers, function (controller) {
if (isFunction(controller.onunload)) controller.onunload({preventDefault: noop});
});
}
if (cached.children) {
if (isArray(cached.children)) forEach(cached.children, unload);
else if (cached.children.tag) unload(cached.children);
}
}
function injectHTML(parentElement, index, data) {
var nextSibling = parentElement.childNodes[index];
if (nextSibling) {
var isElement = nextSibling.nodeType !== 1;
var placeholder = $document.createElement("span");
if (isElement) {
parentElement.insertBefore(placeholder, nextSibling || null);
placeholder.insertAdjacentHTML("beforebegin", data);
parentElement.removeChild(placeholder);
}
else nextSibling.insertAdjacentHTML("beforebegin", data);
}
else {
if (window.Range && window.Range.prototype.createContextualFragment) {
parentElement.appendChild($document.createRange().createContextualFragment(data));
}
else parentElement.insertAdjacentHTML("beforeend", data);
}
var nodes = [];
while (parentElement.childNodes[index] !== nextSibling) {
nodes.push(parentElement.childNodes[index]);
index++;
}
return nodes;
}
function autoredraw(callback, object) {
return function(e) {
e = e || event;
m.redraw.strategy("diff");
m.startComputation();
try { return callback.call(object, e); }
finally {
endFirstComputation();
}
};
}
var html;
var documentNode = {
appendChild: function(node) {
if (html === undefined) html = $document.createElement("html");
if ($document.documentElement && $document.documentElement !== node) {
$document.replaceChild(node, $document.documentElement);
}
else $document.appendChild(node);
this.childNodes = $document.childNodes;
},
insertBefore: function(node) {
this.appendChild(node);
},
childNodes: []
};
var nodeCache = [], cellCache = {};
m.render = function(root, cell, forceRecreation) {
var configs = [];
if (!root) throw new Error("Ensure the DOM element being passed to m.route/m.mount/m.render is not undefined.");
var id = getCellCacheKey(root);
var isDocumentRoot = root === $document;
var node = isDocumentRoot || root === $document.documentElement ? documentNode : root;
if (isDocumentRoot && cell.tag !== "html") cell = {tag: "html", attrs: {}, children: cell};
if (cellCache[id] === undefined) clear(node.childNodes);
if (forceRecreation === true) reset(root);
cellCache[id] = build(node, null, undefined, undefined, cell, cellCache[id], false, 0, null, undefined, configs);
forEach(configs, function (config) { config(); });
};
function getCellCacheKey(element) {
var index = nodeCache.indexOf(element);
return index < 0 ? nodeCache.push(element) - 1 : index;
}
m.trust = function(value) {
value = new String(value);
value.$trusted = true;
return value;
};
function gettersetter(store) {
var prop = function() {
if (arguments.length) store = arguments[0];
return store;
};
prop.toJSON = function() {
return store;
};
return prop;
}
m.prop = function (store) {
//note: using non-strict equality check here because we're checking if store is null OR undefined
if ((store != null && isObject(store) || isFunction(store)) && isFunction(store.then)) {
return propify(store);
}
return gettersetter(store);
};
var roots = [], components = [], controllers = [], lastRedrawId = null, lastRedrawCallTime = 0, computePreRedrawHook = null, computePostRedrawHook = null, topComponent, unloaders = [];
var FRAME_BUDGET = 16; //60 frames per second = 1 call per 16 ms
function parameterize(component, args) {
var controller = function() {
return (component.controller || noop).apply(this, args) || this;
};
if (component.controller) controller.prototype = component.controller.prototype;
var view = function(ctrl) {
var currentArgs = arguments.length > 1 ? args.concat([].slice.call(arguments, 1)) : args;
return component.view.apply(component, currentArgs ? [ctrl].concat(currentArgs) : [ctrl]);
};
view.$original = component.view;
var output = {controller: controller, view: view};
if (args[0] && args[0].key != null) output.attrs = {key: args[0].key};
return output;
}
m.component = function(component) {
for (var args = [], i = 1; i < arguments.length; i++) args.push(arguments[i]);
return parameterize(component, args);
};
m.mount = m.module = function(root, component) {
if (!root) throw new Error("Please ensure the DOM element exists before rendering a template into it.");
var index = roots.indexOf(root);
if (index < 0) index = roots.length;
var isPrevented = false;
var event = {preventDefault: function() {
isPrevented = true;
computePreRedrawHook = computePostRedrawHook = null;
}};
forEach(unloaders, function (unloader) {
unloader.handler.call(unloader.controller, event);
unloader.controller.onunload = null;
});
if (isPrevented) {
forEach(unloaders, function (unloader) {
unloader.controller.onunload = unloader.handler;
});
}
else unloaders = [];
if (controllers[index] && isFunction(controllers[index].onunload)) {
controllers[index].onunload(event);
}
var isNullComponent = component === null;
if (!isPrevented) {
m.redraw.strategy("all");
m.startComputation();
roots[index] = root;
var currentComponent = component ? (topComponent = component) : (topComponent = component = {controller: noop});
var controller = new (component.controller || noop)();
//controllers may call m.mount recursively (via m.route redirects, for example)
//this conditional ensures only the last recursive m.mount call is applied
if (currentComponent === topComponent) {
controllers[index] = controller;
components[index] = component;
}
endFirstComputation();
if (isNullComponent) {
removeRootElement(root, index);
}
return controllers[index];
}
if (isNullComponent) {
removeRootElement(root, index);
}
};
function removeRootElement(root, index) {
roots.splice(index, 1);
controllers.splice(index, 1);
components.splice(index, 1);
reset(root);
nodeCache.splice(getCellCacheKey(root), 1);
}
var redrawing = false, forcing = false;
m.redraw = function(force) {
if (redrawing) return;
redrawing = true;
if (force) forcing = true;
try {
//lastRedrawId is a positive number if a second redraw is requested before the next animation frame
//lastRedrawID is null if it's the first redraw and not an event handler
if (lastRedrawId && !force) {
//when setTimeout: only reschedule redraw if time between now and previous redraw is bigger than a frame, otherwise keep currently scheduled timeout
//when rAF: always reschedule redraw
if ($requestAnimationFrame === window.requestAnimationFrame || new Date - lastRedrawCallTime > FRAME_BUDGET) {
if (lastRedrawId > 0) $cancelAnimationFrame(lastRedrawId);
lastRedrawId = $requestAnimationFrame(redraw, FRAME_BUDGET);
}
}
else {
redraw();
lastRedrawId = $requestAnimationFrame(function() { lastRedrawId = null; }, FRAME_BUDGET);
}
}
finally {
redrawing = forcing = false;
}
};
m.redraw.strategy = m.prop();
function redraw() {
if (computePreRedrawHook) {
computePreRedrawHook();
computePreRedrawHook = null;
}
forEach(roots, function (root, i) {
var component = components[i];
if (controllers[i]) {
var args = [controllers[i]];
m.render(root, component.view ? component.view(controllers[i], args) : "");
}
});
//after rendering within a routed context, we need to scroll back to the top, and fetch the document title for history.pushState
if (computePostRedrawHook) {
computePostRedrawHook();
computePostRedrawHook = null;
}
lastRedrawId = null;
lastRedrawCallTime = new Date;
m.redraw.strategy("diff");
}
var pendingRequests = 0;
m.startComputation = function() { pendingRequests++; };
m.endComputation = function() {
if (pendingRequests > 1) pendingRequests--;
else {
pendingRequests = 0;
m.redraw();
}
}
function endFirstComputation() {
if (m.redraw.strategy() === "none") {
pendingRequests--;
m.redraw.strategy("diff");
}
else m.endComputation();
}
m.withAttr = function(prop, withAttrCallback, callbackThis) {
return function(e) {
e = e || event;
var currentTarget = e.currentTarget || this;
var _this = callbackThis || this;
withAttrCallback.call(_this, prop in currentTarget ? currentTarget[prop] : currentTarget.getAttribute(prop));
};
};
//routing
var modes = {pathname: "", hash: "#", search: "?"};
var redirect = noop, routeParams, currentRoute, isDefaultRoute = false;
m.route = function(root, arg1, arg2, vdom) {
//m.route()
if (arguments.length === 0) return currentRoute;
//m.route(el, defaultRoute, routes)
else if (arguments.length === 3 && isString(arg1)) {
redirect = function(source) {
var path = currentRoute = normalizeRoute(source);
if (!routeByValue(root, arg2, path)) {
if (isDefaultRoute) throw new Error("Ensure the default route matches one of the routes defined in m.route");
isDefaultRoute = true;
m.route(arg1, true);
isDefaultRoute = false;
}
};
var listener = m.route.mode === "hash" ? "onhashchange" : "onpopstate";
window[listener] = function() {
var path = $location[m.route.mode];
if (m.route.mode === "pathname") path += $location.search;
if (currentRoute !== normalizeRoute(path)) redirect(path);
};
computePreRedrawHook = setScroll;
window[listener]();
}
//config: m.route
else if (root.addEventListener || root.attachEvent) {
root.href = (m.route.mode !== 'pathname' ? $location.pathname : '') + modes[m.route.mode] + vdom.attrs.href;
if (root.addEventListener) {
root.removeEventListener("click", routeUnobtrusive);
root.addEventListener("click", routeUnobtrusive);
}
else {
root.detachEvent("onclick", routeUnobtrusive);
root.attachEvent("onclick", routeUnobtrusive);
}
}
//m.route(route, params, shouldReplaceHistoryEntry)
else if (isString(root)) {
var oldRoute = currentRoute;
currentRoute = root;
var args = arg1 || {};
var queryIndex = currentRoute.indexOf("?");
var params = queryIndex > -1 ? parseQueryString(currentRoute.slice(queryIndex + 1)) : {};
for (var i in args) params[i] = args[i];
var querystring = buildQueryString(params);
var currentPath = queryIndex > -1 ? currentRoute.slice(0, queryIndex) : currentRoute;
if (querystring) currentRoute = currentPath + (currentPath.indexOf("?") === -1 ? "?" : "&") + querystring;
var shouldReplaceHistoryEntry = (arguments.length === 3 ? arg2 : arg1) === true || oldRoute === root;
if (window.history.pushState) {
computePreRedrawHook = setScroll;
computePostRedrawHook = function() {
window.history[shouldReplaceHistoryEntry ? "replaceState" : "pushState"](null, $document.title, modes[m.route.mode] + currentRoute);
};
redirect(modes[m.route.mode] + currentRoute);
}
else {
$location[m.route.mode] = currentRoute;
redirect(modes[m.route.mode] + currentRoute);
}
}
};
m.route.param = function(key) {
if (!routeParams) throw new Error("You must call m.route(element, defaultRoute, routes) before calling m.route.param()");
if( !key ){
return routeParams;
}
return routeParams[key];
};
m.route.mode = "search";
function normalizeRoute(route) {
return route.slice(modes[m.route.mode].length);
}
function routeByValue(root, router, path) {
routeParams = {};
var queryStart = path.indexOf("?");
if (queryStart !== -1) {
routeParams = parseQueryString(path.substr(queryStart + 1, path.length));
path = path.substr(0, queryStart);
}
// Get all routes and check if there's
// an exact match for the current path
var keys = Object.keys(router);
var index = keys.indexOf(path);
if(index !== -1){
m.mount(root, router[keys [index]]);
return true;
}
for (var route in router) {
if (route === path) {
m.mount(root, router[route]);
return true;
}
var matcher = new RegExp("^" + route.replace(/:[^\/]+?\.{3}/g, "(.*?)").replace(/:[^\/]+/g, "([^\\/]+)") + "\/?$");
if (matcher.test(path)) {
path.replace(matcher, function() {
var keys = route.match(/:[^\/]+/g) || [];
var values = [].slice.call(arguments, 1, -2);
forEach(keys, function (key, i) {
routeParams[key.replace(/:|\./g, "")] = decodeURIComponent(values[i]);
})
m.mount(root, router[route]);
});
return true;
}
}
}
function routeUnobtrusive(e) {
e = e || event;
if (e.ctrlKey || e.metaKey || e.which === 2) return;
if (e.preventDefault) e.preventDefault();
else e.returnValue = false;