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841 lines (741 loc) · 19.1 KB
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/**
lithe
@author []
@fileoverview a javascript common loader
@vserion 0.3.5
**/
(function(global, undef) {
var isBrowser = !!(
typeof window !== undef &&
global.navigator &&
global.document
);
if (isBrowser) {
//tools function
var doc = global.document,
Arr = Array.prototype,
Obj = Object,
toString = Obj.prototype.toString,
commentRegExp = /(\/\*([\s\S]*?)\*\/|([^:]|^)\/\/(.*)$)/mg,
jsRequireRegExp = /[^.]\s*require\s*\(\s*["']([^'"\s]+)["']\s*\)/g;
var isString = function(v) {
return toString.call(v) === '[object String]';
};
var isFunction = function(v) {
return toString.call(v) === '[object Function]';
};
var isArray = function(v) {
return toString.call(v) === '[object Array]';
};
var isObject = function(v) {
return v === Obj(v);
};
var forEach = Arr.forEach ? function(arr, fn) {
arr.forEach(fn);
} : function(arr, fn) {
for (var i = 0; i < arr.length; i++) {
fn(arr[i], i, arr);
}
};
var filter = Arr.filter ? function(arr, fn) {
return arr.filter(fn);
} : function(arr, fn) {
var ret = [];
forEach(arr, function(item, i, arr) {
if (fn(item, i, arr)) {
ret.push(item);
}
});
return ret;
};
var map = Arr.map ? function(arr, fn) {
return arr.map(fn);
} : function(arr, fn) {
var ret = [];
forEach(arr, function(item, i, arr) {
ret.push(fn(item, i, arr));
});
return ret;
};
var keys = Obj.keys ? Obj.keys : function(o) {
var ret = [];
for (var p in o) {
if (o.hasOwnProperty(p)) {
ret.push(p);
}
}
return ret;
};
// 改动
var values = function(obj) {
var values = [];
function addValues(item) {
values.push(item);
}
for (var pro in obj) {
if (obj.hasOwnProperty(pro)) {
if (isArray(obj[pro])) {
forEach(obj[pro], addValues);
} else {
addValues(obj[pro]);
}
}
}
return values;
};
var indexOf = Arr.indexOf ? function(arr, selector) {
return arr.indexOf(selector);
} : function(arr, selector) {
for (var i = 0; i < arr.length; i++) {
if (arr[i] === selector) {
return i;
}
}
return -1;
};
var getByTagName = function(tag, ele) {
ele = ele || doc;
return ele ? ele.getElementsByTagName(tag) : ele;
};
var noop = function() {};
var getAttr = function(ele, ns) {
return ele.getAttribute(ns);
};
var extend = function(source, options) {
for (var i in options) {
if (options.hasOwnProperty(i)) {
source[i] = options[i];
}
}
return source;
};
var unique = function unique(arr) {
var o = {};
forEach(arr, function(item) {
o[item] = 1;
});
return keys(o);
};
var attr = function attr(node, ns) {
return node.getAttribute(ns);
};
//处理依赖部分
var getDependencies = function(code) {
var deps = [];
code.replace(commentRegExp, '').replace(jsRequireRegExp, function(match, dep) {
deps.push(dep);
});
return unique(deps);
};
var runModuleContext = function(fn, mod) {
var ret = fn(mod.require, mod.exports, mod);
if (ret !== undef) {
mod.exports = ret;
}
};
var Events = function() {
this.map = {};
};
extend(Events.prototype, {
trigger: function(name, args) {
var self = this,
cbs = this.map[name];
if (cbs) {
forEach(cbs, function(fn) {
fn.apply(this, args);
});
}
},
on: function(name, cb) {
if (this.map[name]) {
this.map[name].push(cb);
} else {
this.map[name] = [cb];
}
}
});
var LEVENTS = new Events();
var getTimeStamp = function(url) {
var query = url.slice(url.lastIndexOf('?') + 1).split('&');
for (var i = 0; i < query.length; i++) {
var item = query[i].split('='),
key = item[0],
val = item[1];
if (key === 'timestamp') {
return val;
}
}
return null;
};
var isAbsolute = function(url) {
return url.indexOf('://') > 0 || url.indexOf('//') === 0;
};
var dirname = function(url) {
var s = url.match(/[^?]*(?=\/.*$)/);
return (s ? s[0] : '.') + '/';
};
var filename = function(url) {
return url.slice(url.lastIndexOf('/') + 1).replace(/\?.*$/, '');
};
var isDir = function(url) {
return !filename(url);
};
var realpath = function(path) {
var multiple_slash_re = /([^:\/])\/\/+/g;
multiple_slash_re.lastIndex = 0;
if (multiple_slash_re.test(path)) {
path = path.replace(multiple_slash_re, '$1\/');
}
if (path.indexOf('.') === -1) {
return path;
}
var original = path.split('/'),
ret = [],
part;
for (var i = 0; i < original.length; i++) {
part = original[i];
if (part === '..') {
if (ret.length === 0) {
throw new Error('The path is invalid: ' + path);
}
ret.pop();
} else if (part !== '.') {
ret.push(part);
}
}
return ret.join('/');
};
var normalize = function(url, t) {
url = realpath(url);
var lastChar = url.charAt(url.length - 1);
if (lastChar === '/') {
return url;
}
if (lastChar === '#') {
url = url.slice(0, -1);
} else if (url.indexOf('?') === -1 && !(/\.(?:js|css)$/).test(url)) {
url += '.js';
}
if (url.indexOf(':80/') > 0) {
url = url.replace(':80/', '/');
}
if (t) {
url = url.replace(/\?.+$/, '');
}
return url;
};
var replaceDir = function(id) {
//只替换一次,且如果路径包含2个dir，也只替换一次,并且只匹配第一个，之后的不匹配
// UI:../ -> UI/test = ../test
// UI:../ -> UI/UI/test = ../UI/test
// UI:../ -> ../a/UI/test = ../a/UI/test [不会替换]
// UI:../ -> a/UI/test = a/UI/test [不会替换]
var locks = {},
k, path, reg, dir, j;
for (k = 0; k < directorys.length; k++) {
if (locks[id]) {
break;
}
dir = directorys[k];
for (j in dir) {
path = dir[j];
reg = new RegExp("^" + j + "\/");
if (reg.test(id) && !locks[id]) {
id = id.replace(reg, path);
locks[id] = true;
break;
}
}
}
return id;
};
var replaceId = function(id) {
var alias = config.alias;
if (alias) {
var newid = alias[id];
return newid ? newid : replaceDir(id);
}
return id;
};
var resolve = function(id, path) {
// 改动,处理public依赖的路径
if (lithe && lithe.publicpath && isPublicDeps(id).isPublicDeps) {
path = lithe.publicpath;
} else {
path = dirname(path || lithe.basepath);
}
if (isAbsolute(id)) {
return id;
}
if (isInitConfig) {
id = replaceId(id);
}
var url = '';
if (id.indexOf('./') === 0 || id.indexOf('../') === 0) {
if (id.indexOf('./') === 0) {
id = id.substring(2);
}
url = path + id;
} else if (id.charAt(0) === '/' && id.charAt(1) !== '/') {
url = path + id.substring(1);
} else {
url = path + '/' + id;
}
return normalize(url);
};
var header = doc.head || getByTagName('head')[0] || doc.documentElement,
scripts = getByTagName('script'),
currentJs = scripts[scripts.length - 1],
currentPath = currentJs.src || attr(currentJs, 'src'),
BASEPATH = attr(currentJs, 'data-path') || currentPath,
CONFIG = attr(currentJs, 'data-config'),
CHARSET = attr(currentJs, 'charset') || 'utf8',
DEBUG = attr(currentJs, 'data-debug') === 'true',
DYNAMICCONFIG = attr(currentJs,'data-config-dynamic') === 'true',
GLOBALTIMESTAMP = getTimeStamp(currentJs.src),
CONFIGSTMAP = null,
mainjs = attr(currentJs, 'data-main'),
fetching = {},
callbacks = {},
fetched = {},
publicDeps = [], // 改动,增加public依赖数组;
jsExt = ".js"; // 改动,js后缀
BASEPATH = (BASEPATH === currentPath) ? dirname(currentPath) : resolve(BASEPATH, dirname(currentPath));
var fetch = function(url, cb) {
LEVENTS.trigger('fetch', [url, cb]);
};
LEVENTS.on('fetch', function(url, cb) {
if (! (/\.css$/).test(url)) {
if (fetched[url]) {
cb();
return;
}
if (fetching[url]) {
callbacks[url].push(cb);
return;
}
fetching[url] = true;
callbacks[url] = [cb];
getscript(url, function() {
fetched[url] = true;
delete fetching[url];
var fns = callbacks[url];
if (fns) {
delete callbacks[url];
forEach(fns, function(fn) {
fn();
});
}
},
CHARSET);
}
});
var loadeds = {};
var getscript = function(urls, cb, charset) {
var url = isArray(urls) ? urls.shift() : urls;
function success() {
if (isArray(urls) && urls.length) {
getscript(urls, cb, charset);
} else {
if (isFunction(cb)) {
cb();
}
}
}
if (loadeds[url]) {
success();
return;
}
if (url) {
var node = createNode('script', charset);
node.onload = node.onerror = node.onreadystatechange = function() {
if (/loaded|complete|undefined/.test(node.readyState)) {
node.onload = node.onerror = node.onreadystatechange = null;
if (node.parentNode && ! DEBUG) {
node.parentNode.removeChild(node);
}
node = undef;
loadeds[url] = true;
success();
}
};
node.async = 'async';
var timestamp;
if(DYNAMICCONFIG){
timestamp = CONFIGSTMAP ? CONFIGSTMAP : new Date().valueOf();
}else{
timestamp = CONFIGSTMAP ? CONFIGSTMAP : GLOBALTIMESTAMP;
}
url = timestamp ? url + '?timestamp=' + timestamp: url;
node.src = url;
insertscript(node);
} else {
throw new Error('getscript url is ' + url);
}
};
var createNode = function(tag, charset) {
var node = doc.createElement(tag);
node.charset = charset ? charset: CHARSET;
return node;
};
var insertscript = function(node) {
var baseElement = getByTagName('base', header)[0];
if (baseElement) {
header.insertBefore(node, baseElement);
} else {
header.appendChild(node);
}
};
var anonymouse = [],
config = {},
STATUS = {
'created': 0,
'save': 1,
'ready': 2,
'compiling': 3,
'compiled': 4
},
circularStack = [],
directorys = [],
isInitConfig;
// 改动
var _verifyDeps = function (deps, dep, ext) {
if (deps.indexOf(dep + ext) !== -1) {
return {
isPublicDeps : true,
dep : dep
};
}else {
return {
isPublicDeps : false,
dep : null
};
}
};
//改动
var isPublicDeps = function(dep) {
if (lithe.config.publicdeps) {
var deps = Object.keys(lithe.config.publicdeps),
isDeps;
dep = lithe.config.alias && lithe.config.alias[dep] ? lithe.config.alias[dep] : dep;
var pDeps = map(deps, function (d) {
if (d.lastIndexOf(jsExt) < 0){
return d + jsExt;
}else {
return d;
}
});
// 如果结尾有js
if ((/\.(?:js)$/).test(dep)) {
isDeps = _verifyDeps(pDeps, dep, "");
}
if (!(/\.(?:js)$/).test(dep)) {
isDeps = _verifyDeps(pDeps, dep, jsExt);
}
return isDeps;
}else {
return {
isPublicDeps : false,
dep : null
};
}
};
//help
var getPureDependencies = function(mod) {
var id = mod.id;
var deps = filter(mod.dependencies, function(dep) {
// 改动,过滤当前模块所有依赖的pubic依赖,并存储到publicDeps数组中
if (lithe && lithe.config && lithe.config.publicdeps) {
var flag = isPublicDeps(dep);
if (flag.isPublicDeps) {
savePublicDeps(flag.dep);
return;
}
}
circularStack.push(id);
var isCircular = isCircularWaiting(lithe.cache[resolve(dep)]);
if (isCircular) {
//the circular is ready
circularStack.push(id);
}
circularStack.pop();
return ! isCircular;
});
// 改动,返回非public依赖
var businessDeps = createUrls(deps);
return businessDeps;
};
// 改动,存储public依赖
var savePublicDeps = function(dep) {
publicDeps.push(dep);
publicDeps = unique(publicDeps);
};
var isCircularWaiting = function(mod) {
if (!mod || mod.status !== STATUS.save){
return false;
}
circularStack.push(mod.id);
var deps = mod.dependencies;
if (deps.length) {
if (isOverlap(deps, circularStack)){
return true;
}
for (var i = 0; i < deps.length; i++) {
if (isCircularWaiting(lithe.cache[resolve(deps[i])])){
return true;
}
}
}
circularStack.pop();
return false;
};
var isOverlap = function(arrA, arrB) {
var arrC = arrA.concat(arrB);
return arrC.length > unique(arrC).length;
};
var createUrls = function(urls) {
if(isString(urls)){
urls = [urls];
}
return map(urls, function(url) {
return resolve(url);
});
};
var fetchMods = function(urls, cb) {
urls = createUrls(urls);
LEVENTS.trigger('start', [urls]);
var loadUris = filter(urls, function(url) {
return url && (!lithe.cache[url] || lithe.cache[url].status < STATUS.ready);
}),
len = loadUris.length;
if (len === 0) {
cb();
return;
}
var queue = len;
var restart = function(mod) {
if((mod || {}).status < STATUS.ready){
mod.status = STATUS.ready;
}
--queue;
if(queue === 0){
cb();
}
};
forEach(loadUris, function(url) {
var mod = lithe.get(url);
function success(style) {
LEVENTS.trigger('fetchsuccess', [mod, style]);
if (mod.status >= STATUS.save) {
var deps = getPureDependencies(mod);
if(deps.length){
fetchMods(deps, function() {
restart(mod);
});
}else{
restart(mod);
}
} else if (style) {
restart(mod);
} else {
restart();
}
}
if(mod.status < STATUS.save){
fetch(url, success);
}else{
success();
}
});
};
var saveAnonymouse = function() {
forEach(anonymouse, function(meta) {
var anonymousemod = lithe.get(meta.id);
anonymousemod._save(meta);
});
anonymouse = [];
};
var realUse = function(urls, cb) {
fetchMods(urls, function() {
urls = createUrls(urls);
// 改动,加载public依赖
loadPublicDeps(function(){
var args = map(urls, function(url) {
return url ? lithe.get(url)._compile() : null;
});
if (isFunction(cb)) {
cb.apply(null, args);
}
LEVENTS.trigger('end');
});
});
};
// 改动,加载public依赖jsFile
var loadPublicDeps = function(cb) {
if (lithe.publicpath && publicDeps.length) {
var pDeps = [],
fDeps = [];
// 汇总public依赖的依赖包
forEach(publicDeps, function (deps) {
values(lithe.config.publicdeps[deps]).forEach(function(rdeps) {
if (keys(lithe.config.publicdeps).indexOf(rdeps) !== -1) {
publicDeps.push(rdeps);
}
});
});
// 如果依赖没有js后缀,就加上js后缀然后汇总
// 汇总结果有js后缀的和没有js后缀的,用户在config配置的时候有可能有js后缀,也有可能
// 不写js后缀
forEach(unique(publicDeps), function(deps){
if (deps.lastIndexOf(jsExt) < 0){
pDeps.push(deps);
pDeps.push(deps + jsExt);
}else {
pDeps.push(deps);
}
});
// 获取public依赖的真实路径
forEach(pDeps, function(deps){
if (lithe.config.publicdeps[deps]) {
fDeps.push(keys(lithe.config.publicdeps[deps])[0]);
}
});
var pm = unique(fDeps).join(",");
var nginxPublic = lithe.publicpath + "??" + pm;
forEach(publicDeps,function(mod){
lithe.get(createUrls(mod)[0]);
});
getscript(nginxPublic, cb);
}else{
cb();
}
};
var setConfig = function(cg) {
config = cg;
directorys = [];
var alias = config.alias,
i, alia, dir;
if (alias) {
for (i in alias) {
alia = alias[i];
if (isDir(alia)) {
dir = {};
dir[i] = alia;
directorys.push(dir);
}
}
}
isInitConfig = true;
if (config.basepath){
lithe.basepath = config.basepath;
}
// 改动,publicpath
if (config.publicpath) {
lithe.publicpath = config.publicpath;
}
lithe.config = config;
CONFIGSTMAP = config.timestamp;
};
var Module = function(url) {
this.id = url;
this.status = 0;
this.dependencies = [];
this.exports = null;
this.parent = [];
this.factory = noop;
};
extend(Module.prototype, {
_compile: function() {
var mod = this;
if (mod.status === STATUS.compiled){
return mod.exports;
}
if (mod.status < STATUS.save){
return null;
}
mod.status = STATUS.compiling;
function require(id) {
id = normalize(resolve(id), true);
var child = lithe.cache[id];
if (!child){
return null;
}
if (child.status === STATUS.compiling){
return child.exports;
}
child.parent = mod;
return child._compile();
}
require.cache = lithe.cache;
mod.require = require;
mod.exports = {};
var fun = mod.factory;
if (isFunction(fun)){
runModuleContext(fun, mod);
}
mod.status = STATUS.compiled;
lithe.events.trigger('compiled', [mod]);
return mod.exports;
},
_save: function(meta) {
if (this.status < STATUS.save) {
this.id = meta.id;
this.name = meta.name;
this.dependencies = meta.deps;
this.factory = meta.factory;
this.status = STATUS.save;
}
}
});
var lithe = extend({
basepath: BASEPATH,
events: LEVENTS,
cache: {},
get: function(url) {
url = normalize(url, true);
if(lithe.cache[url]){
return lithe.cache[url];
}else{
lithe.cache[url] = new Module(url);
return lithe.cache[url];
}
},
define: function(id, factory) {
var deps = getDependencies(factory.toString());
var meta = {
id: resolve(id),
name: id,
deps: deps,
factory: factory
};
anonymouse.push(meta);
saveAnonymouse();
},
use: function(urls, cb) {
if(!CONFIG || isInitConfig){
realUse(urls, cb);
}else{
realUse(CONFIG, function(cg) {
setConfig(cg);
realUse(urls, cb);
});
}
},
load:getscript,
setConfig:setConfig
});
if (CONFIG){
CONFIG = createUrls(CONFIG);
}
global.lithe = lithe;
global.define = lithe.define;
if (mainjs) {
setTimeout(function() {
global.lithe.use(mainjs);
});
}
} else {
exports.tool = require('./lib/lithe-tool.js');
exports.hfs = require('./lib/lithe-hfs.js');
}
})(this);
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