DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (5350524bb654)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

var Cc = Components.classes;
var Ci = Components.interfaces;
var Cu = Components.utils;

this.EXPORTED_SYMBOLS = [ "ContentLinkHandler" ];

Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/Services.jsm");
Cu.import("resource://gre/modules/NetUtil.jsm");

XPCOMUtils.defineLazyModuleGetter(this, "Feeds",
  "resource:///modules/Feeds.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "BrowserUtils",
  "resource://gre/modules/BrowserUtils.jsm");

const SIZES_TELEMETRY_ENUM = {
  NO_SIZES: 0,
  ANY: 1,
  DIMENSION: 2,
  INVALID: 3,
};

this.ContentLinkHandler = {
  init: function(chromeGlobal) {
    chromeGlobal.addEventListener("DOMLinkAdded", (event) => {
      this.onLinkEvent(event, chromeGlobal);
    }, false);
    chromeGlobal.addEventListener("DOMLinkChanged", (event) => {
      this.onLinkEvent(event, chromeGlobal);
    }, false);
  },

  onLinkEvent: function(event, chromeGlobal) {
    var link = event.originalTarget;
    var rel = link.rel && link.rel.toLowerCase();
    if (!link || !link.ownerDocument || !rel || !link.href)
      return;

    // Ignore sub-frames (bugs 305472, 479408).
    let window = link.ownerGlobal;
    if (window != window.top)
      return;

    var feedAdded = false;
    var iconAdded = false;
    var searchAdded = false;
    var rels = {};
    for (let relString of rel.split(/\s+/))
      rels[relString] = true;

    for (let relVal in rels) {
      switch (relVal) {
        case "feed":
        case "alternate":
          if (!feedAdded && event.type == "DOMLinkAdded") {
            if (!rels.feed && rels.alternate && rels.stylesheet)
              break;

            if (Feeds.isValidFeed(link, link.ownerDocument.nodePrincipal, "feed" in rels)) {
              chromeGlobal.sendAsyncMessage("Link:AddFeed",
                                            {type: link.type,
                                             href: link.href,
                                             title: link.title});
              feedAdded = true;
            }
          }
          break;
        case "icon":
          if (iconAdded || !Services.prefs.getBoolPref("browser.chrome.site_icons"))
            break;

          var uri = this.getLinkIconURI(link);
          if (!uri)
            break;

          // Telemetry probes for measuring the sizes attribute
          // usage and available dimensions.
          let sizeHistogramTypes = Services.telemetry.
                                   getHistogramById("LINK_ICON_SIZES_ATTR_USAGE");
          let sizeHistogramDimension = Services.telemetry.
                                       getHistogramById("LINK_ICON_SIZES_ATTR_DIMENSION");
          let sizesType;
          if (link.sizes.length) {
            for (let size of link.sizes) {
              if (size.toLowerCase() == "any") {
                sizesType = SIZES_TELEMETRY_ENUM.ANY;
                break;
              } else {
                let re = /^([1-9][0-9]*)x[1-9][0-9]*$/i;
                let values = re.exec(size);
                if (values && values.length > 1) {
                  sizesType = SIZES_TELEMETRY_ENUM.DIMENSION;
                  sizeHistogramDimension.add(parseInt(values[1]));
                } else {
                  sizesType = SIZES_TELEMETRY_ENUM.INVALID;
                  break;
                }
              }
            }
          } else {
            sizesType = SIZES_TELEMETRY_ENUM.NO_SIZES;
          }
          sizeHistogramTypes.add(sizesType);

          chromeGlobal.sendAsyncMessage(
            "Link:SetIcon",
            {url: uri.spec, loadingPrincipal: link.ownerDocument.nodePrincipal});
          iconAdded = true;
          break;
        case "search":
          if (!searchAdded && event.type == "DOMLinkAdded") {
            var type = link.type && link.type.toLowerCase();
            type = type.replace(/^\s+|\s*(?:;.*)?$/g, "");

            let re = /^(?:https?|ftp):/i;
            if (type == "application/opensearchdescription+xml" && link.title &&
                re.test(link.href))
            {
              let engine = { title: link.title, href: link.href };
              chromeGlobal.sendAsyncMessage("Link:AddSearch",
                                            {engine: engine,
                                             url: link.ownerDocument.documentURI});
              searchAdded = true;
            }
          }
          break;
      }
    }
  },

  getLinkIconURI: function(aLink) {
    let targetDoc = aLink.ownerDocument;
    var uri = BrowserUtils.makeURI(aLink.href, targetDoc.characterSet);
    try {
      uri.userPass = "";
    } catch (e) {
      // some URIs are immutable
    }
    return uri;
  },
};