components/application.js

   1 /**
   2  * (C) Copyright 2007 John J. Foerch
   3  * (C) Copyright 2007-2008 Jeremy Maitin-Shepard
   4  *
   5  * Use, modification, and distribution are subject to the terms specified in the
   6  * COPYING file.
   7 **/
   8
   9 const Cc = Components.classes;
  10 const Ci = Components.interfaces;
  11 const Cr = Components.results;
  12 Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
  13
  14 function application () {
  15     Components.utils.import("resource://gre/modules/XPCOMUtils.jsm", this);
  16
  17     this.wrappedJSObject = this;
  18     this.conkeror = this;
  19
  20     this.loaded_modules = [];
  21     this.loading_modules = [];
  22     this.module_after_load_functions = new Object();
  23     this.pending_loads = [];
  24     this.load_paths = [this.module_uri_prefix];
  25
  26     try {
  27         this.require("conkeror.js");
  28     } catch (e) {
  29         this.dumpln("Error initializing.");
  30         this.dump_error(e);
  31     }
  32 }
  33 application.prototype = {
  34     Cc: Cc,
  35     Ci: Ci,
  36     Cr: Cr,
  37     /* Note: resource://app currently doesn't result in xpcnativewrappers=yes */
  38     module_uri_prefix: "chrome://conkeror/content/",
  39     subscript_loader: Cc["@mozilla.org/moz/jssubscript-loader;1"].getService(Ci.mozIJSSubScriptLoader),
  40     preferences: Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefService),
  41     dump_error: function (e) {
  42         if (e instanceof Error) {
  43             this.dumpln(e.name + ": " + e.message);
  44             this.dumpln(e.fileName + ":" + e.lineNumber);
  45             dump(e.stack);
  46         } else if (e instanceof Ci.nsIException) {
  47             this.dumpln(e.name + ": " + e.message);
  48             var stack_frame = e.location;
  49             while (stack_frame) {
  50                 this.dumpln(stack_frame.name + "()@" + stack_frame.filename + ":" + stack_frame.lineNumber);
  51                 stack_frame = stack_frame.caller;
  52             }
  53         } else {
  54             this.dumpln("Error: " + e);
  55         }
  56     },
  57     loaded: function (module) {
  58         return (this.loaded_modules.indexOf(module) != -1);
  59     },
  60     provide: function(module) {
  61         if (this.loaded_modules.indexOf(module) == -1)
  62             this.loaded_modules.push(module);
  63     },
  64     skip_module_load : {},
  65     load_module: function(module_name) {
  66         if (this.loading_modules.indexOf(module_name) != -1)
  67             throw new Error("Circular module dependency detected: "
  68                             + this.loading_modules.join(" -> ") + " -> " + module_name);
  69         this.loading_modules.push(module_name);
  70         try {
  71             let j = 0;
  72             while (true) {
  73                 if (j >= this.load_paths.length)
  74                     throw new Error("Module not found: " + module_name);
  75                 try {
  76                     this.subscript_loader.loadSubScript(this.load_paths[j] + module_name,
  77                                                         this);
  78                     this.provide(module_name);
  79                     let funcs;
  80                     if ((funcs = this.module_after_load_functions[module_name]) != null)
  81                     {
  82                         for (let i = 0; i < funcs.length; ++i)
  83                             funcs[i]();
  84                         delete this.module_after_load_functions[module_name];
  85                     }
  86                 }
  87                 catch (e if e == this.skip_module_load) {}
  88                 catch (e) {
  89                     if (!(e instanceof Error) && !(e instanceof Ci.nsIException) &&
  90                         (String(e) == "ContentLength not available (not a local URL?)" ||
  91                          String(e) == "Error creating channel (invalid URL scheme?)" ||
  92                          String(e) == "Error opening input stream (invalid filename?)")) {
  93                         ++j;
  94                         continue;
  95                     }
  96                     throw e;
  97                 }
  98                 break;
  99             }
 100         }
 101         finally {
 102             this.loading_modules.pop();
 103         }
 104
 105         if (this.loading_modules.length == 0)
 106         {
 107             while (this.pending_loads.length > 0)
 108             {
 109                 this.require(this.pending_loads.pop());
 110             }
 111         }
 112     },
 113     require: function (module) {
 114         if (!this.loaded(module))
 115             this.load_module(module);
 116     },
 117     require_later: function (module) {
 118         if (!this.loaded(module)
 119             && this.pending_loads.indexOf(module) == -1)
 120             this.pending_loads.push(module);
 121     },
 122     call_after_load: function (module, func) {
 123         if (this.loaded(module))
 124             func();
 125         else
 126         {
 127             var funcs;
 128             if (!(funcs = this.module_after_load_functions[module]))
 129                 funcs = this.module_after_load_functions[module] = [];
 130             funcs.push(func);
 131         }
 132     },
 133     dumpln: function (line) {
 134         dump(line + "\n");
 135     },
 136
 137     version: "0.9.1", // preprocessor variable
 138
 139     /* nsISupports */
 140     QueryInterface: XPCOMUtils.generateQI([]),
 141
 142     /* XPCOM registration */
 143     classDescription: "Conkeror global object",
 144     classID: Components.ID("{72a7eea7-a894-47ec-93a9-a7bc172cf1ac}"),
 145     contractID: "@conkeror.mozdev.org/application;1"
 146 };
 147
 148 function NSGetModule (compMgr, fileSpec) {
 149     return XPCOMUtils.generateModule([application]);
 150 }