twitst4tz

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browser.js (5418B)


      1 // shim for using process in browser
      2 var process = module.exports = {};
      3 
      4 // cached from whatever global is present so that test runners that stub it
      5 // don't break things.  But we need to wrap it in a try catch in case it is
      6 // wrapped in strict mode code which doesn't define any globals.  It's inside a
      7 // function because try/catches deoptimize in certain engines.
      8 
      9 var cachedSetTimeout;
     10 var cachedClearTimeout;
     11 
     12 function defaultSetTimout() {
     13     throw new Error('setTimeout has not been defined');
     14 }
     15 function defaultClearTimeout () {
     16     throw new Error('clearTimeout has not been defined');
     17 }
     18 (function () {
     19     try {
     20         if (typeof setTimeout === 'function') {
     21             cachedSetTimeout = setTimeout;
     22         } else {
     23             cachedSetTimeout = defaultSetTimout;
     24         }
     25     } catch (e) {
     26         cachedSetTimeout = defaultSetTimout;
     27     }
     28     try {
     29         if (typeof clearTimeout === 'function') {
     30             cachedClearTimeout = clearTimeout;
     31         } else {
     32             cachedClearTimeout = defaultClearTimeout;
     33         }
     34     } catch (e) {
     35         cachedClearTimeout = defaultClearTimeout;
     36     }
     37 } ())
     38 function runTimeout(fun) {
     39     if (cachedSetTimeout === setTimeout) {
     40         //normal enviroments in sane situations
     41         return setTimeout(fun, 0);
     42     }
     43     // if setTimeout wasn't available but was latter defined
     44     if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
     45         cachedSetTimeout = setTimeout;
     46         return setTimeout(fun, 0);
     47     }
     48     try {
     49         // when when somebody has screwed with setTimeout but no I.E. maddness
     50         return cachedSetTimeout(fun, 0);
     51     } catch(e){
     52         try {
     53             // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
     54             return cachedSetTimeout.call(null, fun, 0);
     55         } catch(e){
     56             // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
     57             return cachedSetTimeout.call(this, fun, 0);
     58         }
     59     }
     60 
     61 
     62 }
     63 function runClearTimeout(marker) {
     64     if (cachedClearTimeout === clearTimeout) {
     65         //normal enviroments in sane situations
     66         return clearTimeout(marker);
     67     }
     68     // if clearTimeout wasn't available but was latter defined
     69     if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
     70         cachedClearTimeout = clearTimeout;
     71         return clearTimeout(marker);
     72     }
     73     try {
     74         // when when somebody has screwed with setTimeout but no I.E. maddness
     75         return cachedClearTimeout(marker);
     76     } catch (e){
     77         try {
     78             // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
     79             return cachedClearTimeout.call(null, marker);
     80         } catch (e){
     81             // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
     82             // Some versions of I.E. have different rules for clearTimeout vs setTimeout
     83             return cachedClearTimeout.call(this, marker);
     84         }
     85     }
     86 
     87 
     88 
     89 }
     90 var queue = [];
     91 var draining = false;
     92 var currentQueue;
     93 var queueIndex = -1;
     94 
     95 function cleanUpNextTick() {
     96     if (!draining || !currentQueue) {
     97         return;
     98     }
     99     draining = false;
    100     if (currentQueue.length) {
    101         queue = currentQueue.concat(queue);
    102     } else {
    103         queueIndex = -1;
    104     }
    105     if (queue.length) {
    106         drainQueue();
    107     }
    108 }
    109 
    110 function drainQueue() {
    111     if (draining) {
    112         return;
    113     }
    114     var timeout = runTimeout(cleanUpNextTick);
    115     draining = true;
    116 
    117     var len = queue.length;
    118     while(len) {
    119         currentQueue = queue;
    120         queue = [];
    121         while (++queueIndex < len) {
    122             if (currentQueue) {
    123                 currentQueue[queueIndex].run();
    124             }
    125         }
    126         queueIndex = -1;
    127         len = queue.length;
    128     }
    129     currentQueue = null;
    130     draining = false;
    131     runClearTimeout(timeout);
    132 }
    133 
    134 process.nextTick = function (fun) {
    135     var args = new Array(arguments.length - 1);
    136     if (arguments.length > 1) {
    137         for (var i = 1; i < arguments.length; i++) {
    138             args[i - 1] = arguments[i];
    139         }
    140     }
    141     queue.push(new Item(fun, args));
    142     if (queue.length === 1 && !draining) {
    143         runTimeout(drainQueue);
    144     }
    145 };
    146 
    147 // v8 likes predictible objects
    148 function Item(fun, array) {
    149     this.fun = fun;
    150     this.array = array;
    151 }
    152 Item.prototype.run = function () {
    153     this.fun.apply(null, this.array);
    154 };
    155 process.title = 'browser';
    156 process.browser = true;
    157 process.env = {};
    158 process.argv = [];
    159 process.version = ''; // empty string to avoid regexp issues
    160 process.versions = {};
    161 
    162 function noop() {}
    163 
    164 process.on = noop;
    165 process.addListener = noop;
    166 process.once = noop;
    167 process.off = noop;
    168 process.removeListener = noop;
    169 process.removeAllListeners = noop;
    170 process.emit = noop;
    171 process.prependListener = noop;
    172 process.prependOnceListener = noop;
    173 
    174 process.listeners = function (name) { return [] }
    175 
    176 process.binding = function (name) {
    177     throw new Error('process.binding is not supported');
    178 };
    179 
    180 process.cwd = function () { return '/' };
    181 process.chdir = function (dir) {
    182     throw new Error('process.chdir is not supported');
    183 };
    184 process.umask = function() { return 0; };