contrib/online_ide/www/js/FileSaver.js

   1 /* FileSaver.js
   2  *  A saveAs() FileSaver implementation.
   3  *  2014-05-27
   4  *
   5  *  By Eli Grey, http://eligrey.com
   6  *  License: X11/MIT
   7  *    See https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md
   8  */
   9
  10 /*global self */
  11 /*jslint bitwise: true, indent: 4, laxbreak: true, laxcomma: true, smarttabs: true, plusplus: true */
  12
  13 /*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/FileSaver.js */
  14
  15 var saveAs = saveAs
  16   // IE 10+ (native saveAs)
  17   || (typeof navigator !== "undefined" &&
  18       navigator.msSaveOrOpenBlob && navigator.msSaveOrOpenBlob.bind(navigator))
  19   // Everyone else
  20   || (function(view) {
  21         "use strict";
  22         // IE <10 is explicitly unsupported
  23         if (typeof navigator !== "undefined" &&
  24             /MSIE [1-9]\./.test(navigator.userAgent)) {
  25                 return;
  26         }
  27         var
  28                   doc = view.document
  29                   // only get URL when necessary in case Blob.js hasn't overridden it yet
  30                 , get_URL = function() {
  31                         return view.URL || view.webkitURL || view;
  32                 }
  33                 , save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a")
  34                 , can_use_save_link = !view.externalHost && "download" in save_link
  35                 , click = function(node) {
  36                         var event = doc.createEvent("MouseEvents");
  37                         event.initMouseEvent(
  38                                 "click", true, false, view, 0, 0, 0, 0, 0
  39                                 , false, false, false, false, 0, null
  40                         );
  41                         node.dispatchEvent(event);
  42                 }
  43                 , webkit_req_fs = view.webkitRequestFileSystem
  44                 , req_fs = view.requestFileSystem || webkit_req_fs || view.mozRequestFileSystem
  45                 , throw_outside = function(ex) {
  46                         (view.setImmediate || view.setTimeout)(function() {
  47                                 throw ex;
  48                         }, 0);
  49                 }
  50                 , force_saveable_type = "application/octet-stream"
  51                 , fs_min_size = 0
  52                 , deletion_queue = []
  53                 , process_deletion_queue = function() {
  54                         var i = deletion_queue.length;
  55                         while (i--) {
  56                                 var file = deletion_queue[i];
  57                                 if (typeof file === "string") { // file is an object URL
  58                                         get_URL().revokeObjectURL(file);
  59                                 } else { // file is a File
  60                                         file.remove();
  61                                 }
  62                         }
  63                         deletion_queue.length = 0; // clear queue
  64                 }
  65                 , dispatch = function(filesaver, event_types, event) {
  66                         event_types = [].concat(event_types);
  67                         var i = event_types.length;
  68                         while (i--) {
  69                                 var listener = filesaver["on" + event_types[i]];
  70                                 if (typeof listener === "function") {
  71                                         try {
  72                                                 listener.call(filesaver, event || filesaver);
  73                                         } catch (ex) {
  74                                                 throw_outside(ex);
  75                                         }
  76                                 }
  77                         }
  78                 }
  79                 , FileSaver = function(blob, name) {
  80                         // First try a.download, then web filesystem, then object URLs
  81                         var
  82                                   filesaver = this
  83                                 , type = blob.type
  84                                 , blob_changed = false
  85                                 , object_url
  86                                 , target_view
  87                                 , get_object_url = function() {
  88                                         var object_url = get_URL().createObjectURL(blob);
  89                                         deletion_queue.push(object_url);
  90                                         return object_url;
  91                                 }
  92                                 , dispatch_all = function() {
  93                                         dispatch(filesaver, "writestart progress write writeend".split(" "));
  94                                 }
  95                                 // on any filesys errors revert to saving with object URLs
  96                                 , fs_error = function() {
  97                                         // don't create more object URLs than needed
  98                                         if (blob_changed || !object_url) {
  99                                                 object_url = get_object_url(blob);
 100                                         }
 101                                         if (target_view) {
 102                                                 target_view.location.href = object_url;
 103                                         } else {
 104                                                 window.open(object_url, "_blank");
 105                                         }
 106                                         filesaver.readyState = filesaver.DONE;
 107                                         dispatch_all();
 108                                 }
 109                                 , abortable = function(func) {
 110                                         return function() {
 111                                                 if (filesaver.readyState !== filesaver.DONE) {
 112                                                         return func.apply(this, arguments);
 113                                                 }
 114                                         };
 115                                 }
 116                                 , create_if_not_found = {create: true, exclusive: false}
 117                                 , slice
 118                         ;
 119                         filesaver.readyState = filesaver.INIT;
 120                         if (!name) {
 121                                 name = "download";
 122                         }
 123                         if (can_use_save_link) {
 124                                 object_url = get_object_url(blob);
 125                                 save_link.href = object_url;
 126                                 save_link.download = name;
 127                                 click(save_link);
 128                                 filesaver.readyState = filesaver.DONE;
 129                                 dispatch_all();
 130                                 return;
 131                         }
 132                         // Object and web filesystem URLs have a problem saving in Google Chrome when
 133                         // viewed in a tab, so I force save with application/octet-stream
 134                         // http://code.google.com/p/chromium/issues/detail?id=91158
 135                         if (view.chrome && type && type !== force_saveable_type) {
 136                                 slice = blob.slice || blob.webkitSlice;
 137                                 blob = slice.call(blob, 0, blob.size, force_saveable_type);
 138                                 blob_changed = true;
 139                         }
 140                         // Since I can't be sure that the guessed media type will trigger a download
 141                         // in WebKit, I append .download to the filename.
 142                         // https://bugs.webkit.org/show_bug.cgi?id=65440
 143                         if (webkit_req_fs && name !== "download") {
 144                                 name += ".download";
 145                         }
 146                         if (type === force_saveable_type || webkit_req_fs) {
 147                                 target_view = view;
 148                         }
 149                         if (!req_fs) {
 150                                 fs_error();
 151                                 return;
 152                         }
 153                         fs_min_size += blob.size;
 154                         req_fs(view.TEMPORARY, fs_min_size, abortable(function(fs) {
 155                                 fs.root.getDirectory("saved", create_if_not_found, abortable(function(dir) {
 156                                         var save = function() {
 157                                                 dir.getFile(name, create_if_not_found, abortable(function(file) {
 158                                                         file.createWriter(abortable(function(writer) {
 159                                                                 writer.onwriteend = function(event) {
 160                                                                         target_view.location.href = file.toURL();
 161                                                                         deletion_queue.push(file);
 162                                                                         filesaver.readyState = filesaver.DONE;
 163                                                                         dispatch(filesaver, "writeend", event);
 164                                                                 };
 165                                                                 writer.onerror = function() {
 166                                                                         var error = writer.error;
 167                                                                         if (error.code !== error.ABORT_ERR) {
 168                                                                                 fs_error();
 169                                                                         }
 170                                                                 };
 171                                                                 "writestart progress write abort".split(" ").forEach(function(event) {
 172                                                                         writer["on" + event] = filesaver["on" + event];
 173                                                                 });
 174                                                                 writer.write(blob);
 175                                                                 filesaver.abort = function() {
 176                                                                         writer.abort();
 177                                                                         filesaver.readyState = filesaver.DONE;
 178                                                                 };
 179                                                                 filesaver.readyState = filesaver.WRITING;
 180                                                         }), fs_error);
 181                                                 }), fs_error);
 182                                         };
 183                                         dir.getFile(name, {create: false}, abortable(function(file) {
 184                                                 // delete file if it already exists
 185                                                 file.remove();
 186                                                 save();
 187                                         }), abortable(function(ex) {
 188                                                 if (ex.code === ex.NOT_FOUND_ERR) {
 189                                                         save();
 190                                                 } else {
 191                                                         fs_error();
 192                                                 }
 193                                         }));
 194                                 }), fs_error);
 195                         }), fs_error);
 196                 }
 197                 , FS_proto = FileSaver.prototype
 198                 , saveAs = function(blob, name) {
 199                         return new FileSaver(blob, name);
 200                 }
 201         ;
 202         FS_proto.abort = function() {
 203                 var filesaver = this;
 204                 filesaver.readyState = filesaver.DONE;
 205                 dispatch(filesaver, "abort");
 206         };
 207         FS_proto.readyState = FS_proto.INIT = 0;
 208         FS_proto.WRITING = 1;
 209         FS_proto.DONE = 2;
 210
 211         FS_proto.error =
 212         FS_proto.onwritestart =
 213         FS_proto.onprogress =
 214         FS_proto.onwrite =
 215         FS_proto.onabort =
 216         FS_proto.onerror =
 217         FS_proto.onwriteend =
 218                 null;
 219
 220         view.addEventListener("unload", process_deletion_queue, false);
 221         saveAs.unload = function() {
 222                 process_deletion_queue();
 223                 view.removeEventListener("unload", process_deletion_queue, false);
 224         };
 225         return saveAs;
 226 }(
 227            typeof self !== "undefined" && self
 228         || typeof window !== "undefined" && window
 229         || this.content
 230 ));
 231 // `self` is undefined in Firefox for Android content script context
 232 // while `this` is nsIContentFrameMessageManager
 233 // with an attribute `content` that corresponds to the window
 234
 235 if (typeof module !== "undefined" && module !== null) {
 236   module.exports = saveAs;
 237 } else if ((typeof define !== "undefined" && define !== null) && (define.amd != null)) {
 238   define([], function() {
 239     return saveAs;
 240   });
 241 }