mithril
Version:
A framework for building brilliant applications
449 lines (430 loc) • 15.3 kB
JavaScript
new function(window) {
var selectorCache = {}
var type = {}.toString
var parser = /(?:(^|#|\.)([^#\.\[\]]+))|(\[.+?\])/g, attrParser = /\[(.+?)(?:=("|'|)(.+?)\2)?\]/
Mithril = m = function() {
var args = arguments
var hasAttrs = type.call(args[1]) == "[object Object]"
var attrs = hasAttrs ? args[1] : {}
var classAttrName = "class" in attrs ? "class" : "className"
var cell = selectorCache[args[0]]
if (cell === undefined) {
selectorCache[args[0]] = cell = {tag: "div", attrs: {}}
var match, classes = []
while (match = parser.exec(args[0])) {
if (match[1] == "") 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] || true
}
}
if (classes.length > 0) cell.attrs[classAttrName] = classes.join(" ")
}
cell = clone(cell)
cell.attrs = clone(cell.attrs)
cell.children = hasAttrs ? args[2] : args[1]
for (var attrName in attrs) {
if (attrName == classAttrName) cell.attrs[attrName] = (cell.attrs[attrName] || "") + " " + attrs[attrName]
else cell.attrs[attrName] = attrs[attrName]
}
return cell
}
function build(parent, data, cached, shouldReattach, index, namespace) {
if (data === null || data === undefined) {
if (cached) clear(cached.nodes)
return
}
if (data.subtree === "retain") return
var cachedType = type.call(cached), dataType = type.call(data)
if (cachedType != dataType) {
if (cached !== null && cached !== undefined) clear(cached.nodes)
cached = new data.constructor
cached.nodes = []
}
if (dataType == "[object Array]") {
var nodes = [], intact = cached.length === data.length
for (var i = 0; i < data.length; i++) {
var item = build(parent, data[i], cached[i], shouldReattach, i, namespace)
if (item === undefined) continue
if (!item.nodes.intact) intact = false
cached[i] = item
}
if (!intact) {
for (var i = 0; i < data.length; i++) if (cached[i] !== undefined) nodes = nodes.concat(cached[i].nodes)
for (var i = nodes.length, node; node = cached.nodes[i]; i++) if (node.parentNode !== null) node.parentNode.removeChild(node)
for (var i = cached.nodes.length, node; node = nodes[i]; i++) if (node.parentNode === null) parent.appendChild(node)
cached.length = data.length
cached.nodes = nodes
}
}
else if (dataType == "[object Object]") {
if (data.tag != cached.tag || Object.keys(data.attrs).join() != Object.keys(cached.attrs).join()) clear(cached.nodes)
if (typeof data.tag != "string") return
var node, isNew = cached.nodes.length === 0
if (data.tag === "svg") namespace = "http://www.w3.org/2000/svg"
if (isNew) {
node = namespace === undefined ? window.document.createElement(data.tag) : window.document.createElementNS(namespace, data.tag)
cached = {
tag: data.tag,
attrs: setAttributes(node, data.attrs, {}, namespace),
children: build(node, data.children, cached.children, true, undefined, namespace),
nodes: [node]
}
parent.insertBefore(node, parent.childNodes[index])
}
else {
node = cached.nodes[0]
setAttributes(node, data.attrs, cached.attrs, namespace)
cached.children = build(node, data.children, cached.children, false, undefined, namespace)
cached.nodes.intact = true
if (shouldReattach === true) parent.insertBefore(node, parent.childNodes[index])
}
if (type.call(data.attrs["config"]) == "[object Function]") data.attrs["config"](node, !isNew)
}
else {
var node
if (cached.nodes.length === 0) {
if (data.$trusted) {
var lastChild = parent.lastChild
parent.insertAdjacentHTML("beforeend", data)
node = lastChild ? lastChild.nextSibling : parent.firstChild
}
else {
node = window.document.createTextNode(data)
parent.insertBefore(node, parent.childNodes[index])
}
cached = "string number boolean".indexOf(typeof data) > -1 ? new data.constructor(data) : data
cached.nodes = [node]
}
else if (cached.valueOf() !== data.valueOf()) {
if (data.$trusted) {
var current = cached.nodes[0], nodes = [current]
if (current) {
while (current = current.nextSibling) nodes.push(current)
clear(nodes)
var lastChild = parent.lastChild
parent.insertAdjacentHTML("beforeend", data)
node = lastChild ? lastChild.nextSibling : parent.firstChild
}
else parent.innerHTML = data
}
else {
node = cached.nodes[0]
parent.insertBefore(node, parent.childNodes[index])
node.nodeValue = data
}
cached = new data.constructor(data)
cached.nodes = [node]
}
else cached.nodes.intact = true
}
return cached
}
function setAttributes(node, dataAttrs, cachedAttrs, namespace) {
for (var attrName in dataAttrs) {
var dataAttr = dataAttrs[attrName]
var cachedAttr = cachedAttrs[attrName]
if (!(attrName in cachedAttrs) || (cachedAttr !== dataAttr) || node === window.document.activeElement) {
cachedAttrs[attrName] = dataAttr
if (attrName === "config") continue
else if (typeof dataAttr == "function" && attrName.indexOf("on") == 0) {
node[attrName] = autoredraw(dataAttr, node)
}
else if (attrName === "style") {
for (var rule in dataAttr) {
if (cachedAttr === undefined || cachedAttr[rule] !== dataAttr[rule]) node.style[rule] = dataAttr[rule]
}
}
else if (namespace !== undefined) {
if (attrName === "href") node.setAttributeNS("http://www.w3.org/1999/xlink", "href", dataAttr)
else if (attrName === "className") node.setAttribute("class", dataAttr)
else node.setAttribute(attrName, dataAttr)
}
else if (attrName in node) node[attrName] = dataAttr
else node.setAttribute(attrName, dataAttr)
}
}
return cachedAttrs
}
function clear(nodes) {
for (var i = 0; i < nodes.length; i++) nodes[i].parentNode.removeChild(nodes[i])
nodes.length = 0
}
function clone(object) {
var result = {}
for (var prop in object) result[prop] = object[prop]
return result
}
function autoredraw(callback, object) {
return function(e) {
m.startComputation()
var output = callback.call(object, e)
m.endComputation()
return output
}
}
var html
var documentNode = {
insertAdjacentHTML: function(_, data) {
window.document.write(data)
window.document.close()
},
appendChild: function(node) {
if (html === undefined) html = window.document.createElement("html")
if (node.nodeName == "HTML") html = node
else html.appendChild(node)
if (window.document.documentElement !== html) {
window.document.replaceChild(html, window.document.documentElement)
}
}
}
var nodeCache = [], cellCache = {}
m.render = function(root, cell) {
var index = nodeCache.indexOf(root)
var id = index < 0 ? nodeCache.push(root) - 1 : index
var node = root == window.document || root == window.document.documentElement ? documentNode : root
cellCache[id] = build(node, cell, cellCache[id], false)
}
m.trust = function(value) {
value = new String(value)
value.$trusted = true
return value
}
var currentRoot, currentModule = {view: function() {}}, currentController = {}, now = 0, lastRedraw = 0, lastRedrawId = 0
m.module = function(root, module) {
m.startComputation()
currentRoot = root
currentModule = module
currentController = new module.controller
m.endComputation()
}
m.redraw = function() {
m.render(currentRoot, currentModule.view(currentController))
lastRedraw = now
}
function redraw() {
now = window.performance && window.performance.now ? window.performance.now() : new window.Date().getTime()
if (now - lastRedraw > 16) m.redraw()
else {
var cancel = window.cancelAnimationFrame || window.clearTimeout
var defer = window.requestAnimationFrame || window.setTimeout
cancel(lastRedrawId)
lastRedrawId = defer(m.redraw, 0)
}
}
var pendingRequests = 0, computePostRedrawHook = null
m.startComputation = function() {pendingRequests++}
m.endComputation = function() {
pendingRequests = Math.max(pendingRequests - 1, 0)
if (pendingRequests == 0) {
redraw()
if (computePostRedrawHook) {
computePostRedrawHook()
computePostRedrawHook = null
}
}
}
m.withAttr = function(prop, withAttrCallback) {
return function(e) {withAttrCallback(prop in e.currentTarget ? e.currentTarget[prop] : e.currentTarget.getAttribute(prop))}
}
//routing
var modes = {pathname: "", hash: "#", search: "?"}
var redirect = function() {}, routeParams = {}
m.route = function() {
if (arguments.length == 3) {
var root = arguments[0], defaultRoute = arguments[1], router = arguments[2]
redirect = function(source) {
var path = source.slice(modes[m.route.mode].length)
if (!routeByValue(root, router, path)) {
m.route(defaultRoute, true)
}
}
var listener = m.route.mode == "hash" ? "onhashchange" : "onpopstate"
window[listener] = function() {
redirect(window.location[m.route.mode])
}
computePostRedrawHook = scrollToHash
window[listener]()
}
else if (arguments[0].addEventListener) {
var element = arguments[0]
var isInitialized = arguments[1]
if (!isInitialized) {
element.removeEventListener("click", routeUnobtrusive)
element.addEventListener("click", routeUnobtrusive)
}
}
else if (typeof arguments[0] == "string") {
var route = arguments[0]
var shouldReplaceHistoryEntry = arguments[1] === true
if (window.history.pushState) {
computePostRedrawHook = function() {
window.history[shouldReplaceHistoryEntry ? "replaceState" : "pushState"](null, window.document.title, modes[m.route.mode] + route)
scrollToHash()
}
redirect(modes[m.route.mode] + route)
}
else window.location[m.route.mode] = route
}
}
m.route.param = function(key) {return routeParams[key]}
m.route.mode = "search"
function routeByValue(root, router, path) {
routeParams = {}
for (var route in router) {
if (route == path) return !void m.module(root, router[route])
var matcher = new RegExp("^" + route.replace(/:[^\/]+/g, "([^\\/]+)") + "$")
if (matcher.test(path)) {
return !void path.replace(matcher, function() {
var keys = route.match(/:[^\/]+/g)
var values = [].slice.call(arguments, 1, -2)
for (var i = 0; i < keys.length; i++) routeParams[keys[i].slice(1)] = values[i]
m.module(root, router[route])
})
}
}
}
function routeUnobtrusive(e) {
e.preventDefault()
m.route(e.currentTarget.getAttribute("href"))
}
function scrollToHash() {
if (m.route.mode != "hash" && window.location.hash) window.location.hash = window.location.hash
}
//model
m.prop = function(store) {
return function() {
if (arguments.length) store = arguments[0]
return store
}
}
m.deferred = function() {
var resolvers = [], rejecters = []
var object = {
resolve: function(value) {
for (var i = 0; i < resolvers.length; i++) resolvers[i](value)
},
reject: function(value) {
for (var i = 0; i < rejecters.length; i++) rejecters[i](value)
},
promise: m.prop()
}
object.promise.resolvers = resolvers
object.promise.then = function(success, error) {
var next = m.deferred()
if (!success) success = identity
if (!error) error = identity
function push(list, method, callback) {
list.push(function(value) {
try {
var result = callback(value)
if (result && typeof result.then == "function") result.then(next[method], error)
else next[method](result !== undefined ? result : value)
}
catch (e) {
if (e instanceof Error && e.constructor !== Error) throw e
else next.reject(e)
}
})
}
push(resolvers, "resolve", success)
push(rejecters, "reject", error)
return next.promise
}
return object
}
m.sync = function(args) {
var method = "resolve"
function synchronizer(resolved) {
return function(value) {
results.push(value)
if (!resolved) method = "reject"
if (results.length == args.length) {
deferred.promise(results)
deferred[method](results)
}
return value
}
}
var deferred = m.deferred()
var results = []
for (var i = 0; i < args.length; i++) {
args[i].then(synchronizer(true), synchronizer(false))
}
return deferred.promise
}
function identity(value) {return value}
function ajax(options) {
var xhr = window.XDomainRequest ? new window.XDomainRequest : new window.XMLHttpRequest
xhr.open(options.method, options.url, true, options.user, options.password)
xhr.onload = typeof options.onload == "function" ? options.onload : function() {}
xhr.onerror = typeof options.onerror == "function" ? options.onerror : function() {}
if (typeof options.config == "function") options.config(xhr, options)
xhr.send(options.data)
return xhr
}
function querystring(object, prefix) {
var str = []
for(var prop in object) {
var key = prefix ? prefix + "[" + prop + "]" : prop, value = object[prop]
str.push(typeof value == "object" ? querystring(value, key) : encodeURIComponent(key) + "=" + encodeURIComponent(value))
}
return str.join("&")
}
function bindData(xhrOptions, data, serialize) {
if (data && Object.keys(data).length > 0) {
if (xhrOptions.method == "GET") {
xhrOptions.url = xhrOptions.url + (xhrOptions.url.indexOf("?") < 0 ? "?" : "&") + querystring(data)
}
else xhrOptions.data = serialize(data)
}
return xhrOptions
}
function parameterizeUrl(url, data) {
var tokens = url.match(/:[a-z]\w+/gi)
if (tokens && data) {
for (var i = 0; i < tokens.length; i++) {
var key = tokens[i].slice(1)
url = url.replace(tokens[i], data[key])
delete data[key]
}
}
return url
}
m.request = function(xhrOptions) {
m.startComputation()
var deferred = m.deferred()
var serialize = xhrOptions.serialize || JSON.stringify
var deserialize = xhrOptions.deserialize || JSON.parse
xhrOptions.url = parameterizeUrl(xhrOptions.url, xhrOptions.data)
xhrOptions = bindData(xhrOptions, xhrOptions.data, serialize)
xhrOptions.onload = xhrOptions.onerror = function(e) {
var unwrap = (e.type == "load" ? xhrOptions.unwrapSuccess : xhrOptions.unwrapError) || identity
var response = unwrap(deserialize(e.target.responseText))
if (response instanceof Array && xhrOptions.type) {
for (var i = 0; i < response.length; i++) response[i] = new xhrOptions.type(response[i])
}
else if (xhrOptions.type) response = new xhrOptions.type(response)
deferred.promise(response)
deferred[e.type == "load" ? "resolve" : "reject"](response)
m.endComputation()
}
ajax(xhrOptions)
deferred.promise.then = propBinder(deferred.promise)
return deferred.promise
}
function propBinder(promise) {
var bind = promise.then
return function(success, error) {
var next = bind(function(value) {return next(success(value))}, function(value) {return next(error(value))})
next.then = propBinder(next)
return next
}
}
if (typeof module != "undefined" && module !== null) module.exports = m
if (typeof define == "function" && define.amd) define(function() {return m})
//testing API
m.deps = function(mock) {return window = mock}
}(this)