modules/element.js

   1 /**
   2  * (C) Copyright 2007-2008 John J. Foerch
   3  * (C) Copyright 2007-2008 Jeremy Maitin-Shepard
   4  *
   5  * Portions of this file are derived from Vimperator,
   6  * (C) Copyright 2006-2007 Martin Stubenschrott.
   7  *
   8  * Use, modification, and distribution are subject to the terms specified in the
   9  * COPYING file.
  10 **/
  11
  12 require("hints.js");
  13 require("save.js");
  14 require("mime-type-override.js");
  15 require("minibuffer-read-mime-type.js");
  16
  17 var browser_object_classes = {};
  18
  19 /**
  20  * handler is a coroutine called as: handler(buffer, prompt)
  21  */
  22 define_keywords("$doc", "$action", "$label", "$handler", "$xpath_expression");
  23 function define_browser_object_class(name) {
  24     keywords(arguments, $xpath_expression = undefined);
  25     var handler = arguments.$handler;
  26     let xpath_expression = arguments.$xpath_expression;
  27     if (handler === undefined && xpath_expression != undefined) {
  28         handler = function (buf, prompt) {
  29             var result = yield buf.window.minibuffer.read_hinted_element(
  30                 $buffer = buf,
  31                 $prompt = prompt,
  32                 $hint_xpath_expression = xpath_expression);
  33             yield co_return(result);
  34         };
  35     }
  36     var base_obj = browser_object_classes[name];
  37     if (base_obj == null)
  38         base_obj = browser_object_classes[name] = {};
  39     var obj;
  40     if (arguments.$action) {
  41         name = name + "/" + arguments.$action;
  42         obj = browser_object_classes[name];
  43         if (obj == null)
  44             obj = browser_object_classes[name] = {__proto__: base_obj};
  45     } else
  46         obj = base_obj;
  47     if (arguments.$label !== undefined)
  48         obj.label = arguments.$label;
  49     if (arguments.$doc !== undefined)
  50         obj.doc = arguments.$doc;
  51     if (handler !== undefined)
  52         obj.handler = handler;
  53     interactive(
  54         "browser-object-class-"+name,
  55         "A prefix command to specify that the following command operate "+
  56             "on objects of type: "+name+".",
  57         function (ctx) { ctx._browser_object_class = name; },
  58         $prefix = true);
  59 }
  60
  61 define_browser_object_class("images",
  62                             $label = "image",
  63                             $xpath_expression = "//img | //xhtml:img");
  64
  65 define_browser_object_class("frames", $label = "frame", $handler = function (buf, prompt) {
  66     check_buffer(buf, content_buffer);
  67     var doc = buf.document;
  68     if (doc.getElementsByTagName("frame").length == 0 &&
  69         doc.getElementsByTagName("iframe").length == 0)
  70     {
  71         // only one frame (the top-level one), no need to use the hints system
  72         yield co_return(buf.top_frame);
  73     }
  74
  75     var result = yield buf.window.minibuffer.read_hinted_element(
  76         $buffer = buf,
  77         $prompt = prompt,
  78         $hint_xpath_expression = "//iframe | //frame | //xhtml:iframe | //xhtml:frame");
  79     yield co_return(result);
  80 });
  81
  82 define_browser_object_class(
  83     "links", $label = "link",
  84     $xpath_expression =
  85         "//*[@onclick or @onmouseover or @onmousedown or @onmouseup or @oncommand or " +
  86         "@role='link'] | " +
  87         "//input[not(@type='hidden')] | //a | //area | //iframe | //textarea | //button | //select | //label | " +
  88         "//xhtml:*[@onclick or @onmouseover or @onmousedown or @onmouseup or @oncommand] | " +
  89         "//xhtml:input[not(@type='hidden')] | //xhtml:a | //xhtml:area | //xhtml:iframe | //xhtml:textarea | " +
  90         "//xhtml:button | //xhtml:select");
  91
  92 define_browser_object_class("mathml", $label = "MathML element", $xpath_expression = "//m:math");
  93
  94 define_browser_object_class("top", $handler = function (buf, prompt) { yield co_return(buf.top_frame); });
  95
  96 define_browser_object_class("url", $handler = function (buf, prompt) {
  97                                 check_buffer (buf, content_buffer);
  98                                 var result = yield buf.window.minibuffer.read_url ($prompt = prompt);
  99                                 yield co_return (result);
 100                             });
 101
 102 define_variable(
 103     "default_browser_object_classes",
 104     {
 105         follow: "links",
 106         follow_top: "frames",
 107         focus: "frames",
 108         save: "links",
 109         copy: "links",
 110         view_source: "frames",
 111         bookmark: "frames",
 112         save_page: "frames",
 113         save_page_complete: "top",
 114         save_page_as_text: "frames",
 115         default: "links"
 116     },
 117     "Specifies the default object class for each operation.\n" +
 118         "This variable should be an object literal with string-valued properties that specify one of the defined browser object classes.  If a property named after the operation is not present, the \"default\" property is consulted instead.");
 119
 120 interactive_context.prototype.browser_object_class = function (action_name) {
 121     var cls =
 122         this._browser_object_class ||
 123         this.get("default_browser_object_classes")[action_name] ||
 124         this.get("default_browser_object_classes")["default"];
 125     return cls;
 126 };
 127
 128 function lookup_browser_object_class(class_name, action) {
 129     var obj;
 130     if (action != null) {
 131         obj = browser_object_classes[class_name + "/" + action];
 132         if (obj)
 133             return obj;
 134     }
 135     return browser_object_classes[class_name];
 136 }
 137
 138 interactive_context.prototype.read_browser_object = function(action, action_name, target)
 139 {
 140     var object_class_name = this.browser_object_class(action);
 141     var object_class = lookup_browser_object_class(object_class_name, action);
 142
 143     var prompt = action_name;
 144     var label = object_class.label || object_class_name;
 145     if (target != null)
 146         prompt += TARGET_PROMPTS[target];
 147     prompt += " (select " + label + "):";
 148
 149     var result = yield object_class.handler.call(null, this.buffer, prompt);
 150     yield co_return(result);
 151 }
 152
 153
 154 function is_dom_node_or_window(elem) {
 155     if (elem instanceof Ci.nsIDOMNode)
 156         return true;
 157     if (elem instanceof Ci.nsIDOMWindow)
 158         return true;
 159     return false;
 160 }
 161
 162 /**
 163  * This is a simple wrapper function that sets focus to elem, and
 164  * bypasses the automatic focus prevention system, which might
 165  * otherwise prevent this from happening.
 166  */
 167 function browser_set_element_focus(buffer, elem, prevent_scroll) {
 168     if (!is_dom_node_or_window(elem))
 169         return;
 170
 171     buffer.last_user_input_received = Date.now();
 172     if (prevent_scroll)
 173         set_focus_no_scroll(buffer.window, elem);
 174     else
 175         elem.focus();
 176 }
 177
 178 function browser_element_focus(buffer, elem)
 179 {
 180     if (!is_dom_node_or_window(elem))
 181         return;
 182
 183     if (elem instanceof Ci.nsIDOMXULTextBoxElement)  {
 184         // Focus the input field instead
 185         elem = elem.wrappedJSObject.inputField;
 186     }
 187
 188     browser_set_element_focus(buffer, elem);
 189     if (elem instanceof Ci.nsIDOMWindow) {
 190         return;
 191     }
 192     // If it is not a window, it must be an HTML element
 193     var x = 0;
 194     var y = 0;
 195     if (elem instanceof Ci.nsIDOMHTMLFrameElement || elem instanceof Ci.nsIDOMHTMLIFrameElement) {
 196         elem.contentWindow.focus();
 197         return;
 198     }
 199     if (elem instanceof Ci.nsIDOMHTMLAreaElement) {
 200         var coords = elem.getAttribute("coords").split(",");
 201         x = Number(coords[0]);
 202         y = Number(coords[1]);
 203     }
 204
 205     var doc = elem.ownerDocument;
 206     var evt = doc.createEvent("MouseEvents");
 207     var doc = elem.ownerDocument;
 208
 209     evt.initMouseEvent("mouseover", true, true, doc.defaultView, 1, x, y, 0, 0, 0, 0, 0, 0, 0, null);
 210     elem.dispatchEvent(evt);
 211 }
 212
 213 function browser_element_follow(buffer, target, elem)
 214 {
 215     browser_set_element_focus(buffer, elem, true /* no scroll */);
 216
 217     var no_click = (is_load_spec(elem) ||
 218                     (elem instanceof Ci.nsIDOMWindow) ||
 219                     (elem instanceof Ci.nsIDOMHTMLFrameElement) ||
 220                     (elem instanceof Ci.nsIDOMHTMLIFrameElement) ||
 221                     (elem instanceof Ci.nsIDOMHTMLLinkElement) ||
 222                     (elem instanceof Ci.nsIDOMHTMLImageElement &&
 223                      !elem.hasAttribute("onmousedown") && !elem.hasAttribute("onclick")));
 224
 225     if (target == FOLLOW_DEFAULT && !no_click) {
 226         var x = 1, y = 1;
 227         if (elem instanceof Ci.nsIDOMHTMLAreaElement) {
 228             var coords = elem.getAttribute("coords").split(",");
 229             if (coords.length >= 2) {
 230                 x = Number(coords[0]) + 1;
 231                 y = Number(coords[1]) + 1;
 232             }
 233         }
 234         browser_follow_link_with_click(buffer, elem, x, y);
 235         return;
 236     }
 237
 238     var spec = element_get_load_spec(elem);
 239     if (spec == null) {
 240         throw interactive_error("Element has no associated URL");
 241         return;
 242     }
 243
 244     if (load_spec_uri_string(spec).match(/^\s*javascript:/)) {
 245         // This URL won't work
 246         throw interactive_error("Can't load javascript URL");
 247     }
 248
 249     if (!(buffer instanceof content_buffer) &&
 250         (target == FOLLOW_CURRENT_FRAME ||
 251          target == FOLLOW_DEFAULT ||
 252          target == FOLLOW_TOP_FRAME ||
 253          target == OPEN_CURRENT_BUFFER))
 254         target = OPEN_NEW_BUFFER;
 255
 256     switch (target) {
 257     case FOLLOW_CURRENT_FRAME:
 258         var current_frame = load_spec_source_frame(spec);
 259         if (current_frame && current_frame != buffer.top_frame) {
 260             var target_obj = get_web_navigation_for_frame(current_frame);
 261             apply_load_spec(target_obj, spec);
 262             break;
 263         }
 264     case FOLLOW_DEFAULT:
 265     case FOLLOW_TOP_FRAME:
 266     case OPEN_CURRENT_BUFFER:
 267         buffer.load(spec);
 268         break;
 269     case OPEN_NEW_WINDOW:
 270     case OPEN_NEW_BUFFER:
 271     case OPEN_NEW_BUFFER_BACKGROUND:
 272         create_buffer(buffer.window,
 273                       buffer_creator(content_buffer,
 274                                      $load = spec,
 275                                      $configuration = buffer.configuration),
 276                       target);
 277     }
 278 }
 279
 280 /**
 281  * Follow a link-like element by generating fake mouse events.
 282  */
 283 function browser_follow_link_with_click(buffer, elem, x, y) {
 284     var doc = elem.ownerDocument;
 285     var view = doc.defaultView;
 286
 287     var evt = doc.createEvent("MouseEvents");
 288     evt.initMouseEvent("mousedown", true, true, view, 1, x, y, 0, 0, /*ctrl*/ 0, /*event.altKey*/0,
 289                        /*event.shiftKey*/ 0, /*event.metaKey*/ 0, 0, null);
 290     elem.dispatchEvent(evt);
 291
 292     evt.initMouseEvent("click", true, true, view, 1, x, y, 0, 0, /*ctrl*/ 0, /*event.altKey*/0,
 293                        /*event.shiftKey*/ 0, /*event.metaKey*/ 0, 0, null);
 294     elem.dispatchEvent(evt);
 295 }
 296
 297 function element_get_load_spec(elem) {
 298
 299     if (is_load_spec(elem))
 300         return elem;
 301
 302     var spec = null;
 303
 304     if (elem instanceof Ci.nsIDOMWindow)
 305         spec = load_spec({document: elem.document});
 306
 307     else if (elem instanceof Ci.nsIDOMHTMLFrameElement ||
 308              elem instanceof Ci.nsIDOMHTMLIFrameElement)
 309         spec = load_spec({document: elem.contentDocument});
 310
 311     else {
 312         var url = null;
 313         var title = null;
 314
 315         if (elem instanceof Ci.nsIDOMHTMLAnchorElement ||
 316             elem instanceof Ci.nsIDOMHTMLAreaElement ||
 317             elem instanceof Ci.nsIDOMHTMLLinkElement) {
 318             if (!elem.hasAttribute("href"))
 319                 return null; // nothing can be done, as no nesting within these elements is allowed
 320             url = elem.href;
 321             title = elem.title || elem.textContent;
 322         }
 323         else if (elem instanceof Ci.nsIDOMHTMLImageElement) {
 324             url = elem.src;
 325             title = elem.title || elem.alt;
 326         }
 327         else {
 328             var node = elem;
 329             while (node && !(node instanceof Ci.nsIDOMHTMLAnchorElement))
 330                 node = node.parentNode;
 331             if (node && !node.hasAttribute("href"))
 332                 node = null;
 333             else
 334                 url = node.href;
 335             if (!node) {
 336                 // Try simple XLink
 337                 node = elem;
 338                 while (node) {
 339                     if (node.nodeType == Ci.nsIDOMNode.ELEMENT_NODE) {
 340                         url = linkNode.getAttributeNS(XLINK_NS, "href");
 341                         break;
 342                     }
 343                     node = node.parentNode;
 344                 }
 345                 if (url)
 346                     url = makeURLAbsolute(node.baseURI, url);
 347                 title = node.title || node.textContent;
 348             }
 349         }
 350         if (url && url.length > 0) {
 351             if (title && title.length == 0)
 352                 title = null;
 353             spec = load_spec({uri: url, source_frame: elem.ownerDocument.defaultView, title: title});
 354         }
 355     }
 356     return spec;
 357 }
 358
 359 interactive("follow", null, function (I) {
 360     var target = I.browse_target("follow");
 361     var element = yield I.read_browser_object("follow", "Follow", target);
 362     browser_element_follow(I.buffer, target, element);
 363 });
 364
 365 interactive("follow-top", null, function (I) {
 366     var target = I.browse_target("follow-top");
 367     var element = yield I.read_browser_object("follow_top", "Follow", target);
 368     browser_element_follow(I.buffer, target, element);
 369 });
 370
 371 interactive("focus", null, function (I) {
 372     var element = yield I.read_browser_object("focus", "Focus");
 373     browser_element_focus(I.buffer, element);
 374 });
 375
 376 function element_get_load_target_label(element) {
 377     if (element instanceof Ci.nsIDOMWindow)
 378         return "page";
 379     if (element instanceof Ci.nsIDOMHTMLFrameElement)
 380         return "frame";
 381     if (element instanceof Ci.nsIDOMHTMLIFrameElement)
 382         return "iframe";
 383     return null;
 384 }
 385
 386 function element_get_operation_label(element, op_name, suffix) {
 387     var target_label = element_get_load_target_label(element);
 388     if (target_label != null)
 389         target_label = " " + target_label;
 390     else
 391         target_label = "";
 392
 393     if (suffix != null)
 394         suffix = " " + suffix;
 395     else
 396         suffix = "";
 397
 398     return op_name + target_label + suffix + ":";
 399 }
 400
 401 interactive("save", null, function (I) {
 402     var element = yield I.read_browser_object("save", "Save");
 403
 404     var spec = element_get_load_spec(element);
 405     if (spec == null)
 406         throw interactive_error("Element has no associated URI");
 407
 408     var panel;
 409     panel = create_info_panel(I.window, "download-panel",
 410                               [["downloading",
 411                                 element_get_operation_label(element, "Saving"),
 412                                 load_spec_uri_string(spec)],
 413                                ["mime-type", "Mime type:", load_spec_mime_type(spec)]]);
 414
 415     try {
 416         var file = yield I.minibuffer.read_file_check_overwrite(
 417             $prompt = "Save as:",
 418             $initial_value = suggest_save_path_from_file_name(suggest_file_name(spec), I.buffer),
 419             $history = "save");
 420
 421     } finally {
 422         panel.destroy();
 423     }
 424
 425     save_uri(spec, file,
 426              $buffer = I.buffer,
 427              $use_cache = false);
 428 });
 429
 430 function browser_element_copy(buffer, elem)
 431 {
 432     var spec = element_get_load_spec(elem);
 433     var text = null;
 434     if (spec)
 435         text = load_spec_uri_string(spec);
 436     else  {
 437         if (!(elem instanceof Ci.nsIDOMNode))
 438             throw interactive_error("Element has no associated text to copy.");
 439         switch (elem.localName) {
 440         case "INPUT":
 441         case "TEXTAREA":
 442             text = elem.value;
 443             break;
 444         case "SELECT":
 445             if (elem.selectedIndex >= 0)
 446                 text = elem.item(elem.selectedIndex).text;
 447             break;
 448         default:
 449             text = elem.textContent;
 450             break;
 451         }
 452     }
 453     browser_set_element_focus(buffer, elem);
 454     writeToClipboard (text);
 455     buffer.window.minibuffer.message ("Copied: " + text);
 456 }
 457
 458
 459 interactive("copy", null, function (I) {
 460     var element = yield I.read_browser_object("copy", "Copy");
 461     browser_element_copy(I.buffer, element);
 462 });
 463
 464 var view_source_use_external_editor = false, view_source_function = null;
 465 function browser_element_view_source(buffer, target, elem)
 466 {
 467     if (view_source_use_external_editor || view_source_function)
 468     {
 469         var spec = element_get_load_spec(elem);
 470         if (spec == null) {
 471             throw interactive_error("Element has no associated URL");
 472             return;
 473         }
 474
 475         let [file, temp] = yield download_as_temporary(spec,
 476                                                        $buffer = buffer,
 477                                                        $action = "View source");
 478         if (view_source_use_external_editor)
 479             yield open_file_with_external_editor(file, $temporary = temp);
 480         else
 481             yield view_source_function(file, $temporary = temp);
 482         return;
 483     }
 484
 485     var win = null;
 486     var window = buffer.window;
 487     if (elem.localName) {
 488         switch (elem.localName.toLowerCase()) {
 489         case "frame": case "iframe":
 490             win = elem.contentWindow;
 491             break;
 492         case "math":
 493             view_mathml_source (window, charset, elem);
 494             return;
 495         default:
 496             throw new Error("Invalid browser element");
 497         }
 498     } else
 499         win = elem;
 500     win.focus();
 501
 502     var url_s = win.location.href;
 503     if (url_s.substring (0,12) != "view-source:") {
 504         try {
 505             open_in_browser(buffer, target, "view-source:" + url_s);
 506         } catch(e) { dump_error(e); }
 507     } else {
 508         window.minibuffer.message ("Already viewing source");
 509     }
 510 }
 511
 512 interactive("view-source", null, function (I) {
 513     var target = I.browse_target("follow");
 514     var element = yield I.read_browser_object("view_source", "View source", target);
 515     yield browser_element_view_source(I.buffer, target, element);
 516 });
 517
 518 interactive("shell-command-on-url", null, function (I) {
 519     var cwd = I.cwd;
 520     var element = yield I.read_browser_object("shell_command_url", "URL shell command");
 521     var spec = element_get_load_spec(element);
 522     if (spec == null)
 523         throw interactive_error("Unable to obtain URI from element");
 524
 525     var uri = load_spec_uri_string(spec);
 526
 527     var panel;
 528     panel = create_info_panel(I.window, "download-panel",
 529                               [["downloading",
 530                                 element_get_operation_label(element, "Running on", "URI"),
 531                                 load_spec_uri_string(spec)],
 532                                ["mime-type", "Mime type:", load_spec_mime_type(spec)]]);
 533
 534     try {
 535         var cmd = yield I.minibuffer.read_shell_command(
 536             $cwd = cwd,
 537             $initial_value = load_spec_default_shell_command(spec));
 538     } finally {
 539         panel.destroy();
 540     }
 541
 542     shell_command_with_argument_blind(cmd, uri, $cwd = cwd);
 543 });
 544
 545 function browser_element_shell_command(buffer, elem, command) {
 546     var spec = element_get_load_spec(elem);
 547     if (spec == null) {
 548         throw interactive_error("Element has no associated URL");
 549         return;
 550     }
 551     yield download_as_temporary(spec,
 552                                 $buffer = buffer,
 553                                 $shell_command = command,
 554                                 $shell_command_cwd = buffer.cwd);
 555 }
 556
 557 interactive("shell-command-on-file", null, function (I) {
 558     var cwd = I.cwd;
 559     var element = yield I.read_browser_object("shell_command", "Shell command");
 560
 561     var spec = element_get_load_spec(element);
 562     if (spec == null)
 563         throw interactive_error("Unable to obtain URI from element");
 564
 565     var uri = load_spec_uri_string(spec);
 566
 567     var panel;
 568     panel = create_info_panel(I.window, "download-panel",
 569                               [["downloading",
 570                                 element_get_operation_label(element, "Running on"),
 571                                 load_spec_uri_string(spec)],
 572                                ["mime-type", "Mime type:", load_spec_mime_type(spec)]]);
 573
 574     try {
 575
 576         var cmd = yield I.minibuffer.read_shell_command(
 577             $cwd = cwd,
 578             $initial_value = load_spec_default_shell_command(spec));
 579     } finally {
 580         panel.destroy();
 581     }
 582
 583     /* FIXME: specify cwd as well */
 584     yield browser_element_shell_command(I.buffer, element, cmd);
 585 });
 586
 587 interactive("bookmark", null, function (I) {
 588     var element = yield I.read_browser_object("bookmark", "Bookmark");
 589     var spec = element_get_load_spec(element);
 590     if (!spec)
 591         throw interactive_error("Element has no associated URI");
 592     var uri_string = load_spec_uri_string(spec);
 593     var panel;
 594     panel = create_info_panel(I.window, "bookmark-panel",
 595                               [["bookmarking",
 596                                 element_get_operation_label(element, "Bookmarking"),
 597                                 uri_string]]);
 598     try {
 599         var title = yield I.minibuffer.read($prompt = "Bookmark with title:", $initial_value = load_spec_title(spec) || "");
 600     } finally {
 601         panel.destroy();
 602     }
 603     add_bookmark(uri_string, title);
 604     I.minibuffer.message("Added bookmark: " + uri_string + " - " + title);
 605 });
 606
 607 interactive("save-page", null, function (I) {
 608     check_buffer(I.buffer, content_buffer);
 609     var element = yield I.read_browser_object("save_page", "Save page");
 610     var spec = element_get_load_spec(element);
 611     if (!spec || !load_spec_document(spec))
 612         throw interactive_error("Element is not associated with a document.");
 613     var suggested_path = suggest_save_path_from_file_name(suggest_file_name(spec), I.buffer);
 614
 615     var panel;
 616     panel = create_info_panel(I.window, "download-panel",
 617                               [["downloading",
 618                                 element_get_operation_label(element, "Saving"),
 619                                 load_spec_uri_string(spec)],
 620                                ["mime-type", "Mime type:", load_spec_mime_type(spec)]]);
 621
 622     try {
 623         var file = yield I.minibuffer.read_file_check_overwrite(
 624             $prompt = "Save page as:",
 625             $history = "save",
 626             $initial_value = suggested_path);
 627     } finally {
 628         panel.destroy();
 629     }
 630
 631     save_uri(spec, file, $buffer = I.buffer);
 632 });
 633
 634 interactive("save-page-as-text", null, function (I) {
 635     check_buffer(I.buffer, content_buffer);
 636     var element = yield I.read_browser_object("save_page_as_text", "Save page as text");
 637     var spec = element_get_load_spec(element);
 638     var doc;
 639     if (!spec || !(doc = load_spec_document(spec)))
 640         throw interactive_error("Element is not associated with a document.");
 641     var suggested_path = suggest_save_path_from_file_name(suggest_file_name(spec, "txt"), I.buffer);
 642
 643     var panel;
 644     panel = create_info_panel(I.window, "download-panel",
 645                               [["downloading",
 646                                 element_get_operation_label(element, "Saving", "as text"),
 647                                 load_spec_uri_string(spec)],
 648                                ["mime-type", "Mime type:", load_spec_mime_type(spec)]]);
 649
 650     try {
 651         var file = yield I.minibuffer.read_file_check_overwrite(
 652             $prompt = "Save page as text:",
 653             $history = "save",
 654             $initial_value = suggested_path);
 655     } finally {
 656         panel.destroy();
 657     }
 658
 659     save_document_as_text(doc, file, $buffer = I.buffer);
 660 });
 661
 662 interactive("save-page-complete", null, function (I) {
 663     check_buffer(I.buffer, content_buffer);
 664     var element = yield I.read_browser_object("save_page_complete", "Save page complete");
 665     var spec = element_get_load_spec(element);
 666     var doc;
 667     if (!spec || !(doc = load_spec_document(spec)))
 668         throw interactive_error("Element is not associated with a document.");
 669     var suggested_path = suggest_save_path_from_file_name(suggest_file_name(spec), I.buffer);
 670
 671     var panel;
 672     panel = create_info_panel(I.window, "download-panel",
 673                               [["downloading",
 674                                 element_get_operation_label(element, "Saving complete"),
 675                                 load_spec_uri_string(spec)],
 676                                ["mime-type", "Mime type:", load_spec_mime_type(spec)]]);
 677
 678     try {
 679         var file = yield I.minibuffer.read_file_check_overwrite(
 680             $prompt = "Save page complete:",
 681             $history = "save",
 682             $initial_value = suggested_path);
 683         // FIXME: use proper read function
 684         var dir = yield I.minibuffer.read_file(
 685             $prompt = "Data Directory:",
 686             $history = "save",
 687             $initial_value = file.path + ".support");
 688     } finally {
 689         panel.destroy();
 690     }
 691
 692     save_document_complete(doc, file, dir, $buffer = I.buffer);
 693 });
 694
 695 default_browse_targets["view-as-mime-type"] = [FOLLOW_CURRENT_FRAME, OPEN_CURRENT_BUFFER,
 696                                                OPEN_NEW_BUFFER, OPEN_NEW_WINDOW];
 697 interactive("view-as-mime-type",
 698             "Display a browser object in the browser using the specified MIME type.",
 699             function (I) {
 700                 var element = yield I.read_browser_object("view_as_mime_type", "View in browser as mime type");
 701                 var spec = element_get_load_spec(element);
 702
 703                 var target = I.browse_target("view-as-mime-type");
 704
 705                 if (!spec)
 706                     throw interactive_error("Element is not associated with a URI");
 707
 708                 if (!can_override_mime_type_for_uri(load_spec_uri(spec)))
 709                     throw interactive_error("Overriding the MIME type is not currently supported for non-HTTP URLs.");
 710
 711                 var panel;
 712
 713                 var mime_type = load_spec_mime_type(spec);
 714                 panel = create_info_panel(I.window, "download-panel",
 715                                           [["downloading",
 716                                             element_get_operation_label(element, "View in browser"),
 717                                             load_spec_uri_string(spec)],
 718                                            ["mime-type", "Mime type:", load_spec_mime_type(spec)]]);
 719
 720
 721                 try {
 722                     let suggested_type = mime_type;
 723                     if (gecko_viewable_mime_type_list.indexOf(suggested_type) == -1)
 724                         suggested_type = "text/plain";
 725                     mime_type = yield I.minibuffer.read_gecko_viewable_mime_type(
 726                         $prompt = "View internally as",
 727                         $initial_value = suggested_type,
 728                         $select);
 729                     override_mime_type_for_next_load(load_spec_uri(spec), mime_type);
 730                     browser_element_follow(I.buffer, target, spec);
 731                 } finally {
 732                     panel.destroy();
 733                 }
 734             });