The Tor Browser: toolkit/modules/sessionstore/XPathGenerator.jsm@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this file,

     3  * You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 "use strict";

     7 this.EXPORTED_SYMBOLS = ["XPathGenerator"];

     9 this.XPathGenerator = {

    10   // these two hashes should be kept in sync

    11   namespaceURIs:     {

    12     "xhtml": "http://www.w3.org/1999/xhtml",

    13     "xul": "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"

    14   },

    15   namespacePrefixes: {

    16     "http://www.w3.org/1999/xhtml": "xhtml",

    17     "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul": "xul"

    18   },

    20   /**

    21    * Generates an approximate XPath query to an (X)HTML node

    22    */

    23   generate: function sss_xph_generate(aNode) {

    24     // have we reached the document node already?

    25     if (!aNode.parentNode)

    26       return "";

    28     // Access localName, namespaceURI just once per node since it's expensive.

    29     let nNamespaceURI = aNode.namespaceURI;

    30     let nLocalName = aNode.localName;

    32     let prefix = this.namespacePrefixes[nNamespaceURI] || null;

    33     let tag = (prefix ? prefix + ":" : "") + this.escapeName(nLocalName);

    35     // stop once we've found a tag with an ID

    36     if (aNode.id)

    37       return "//" + tag + "[@id=" + this.quoteArgument(aNode.id) + "]";

    39     // count the number of previous sibling nodes of the same tag

    40     // (and possible also the same name)

    41     let count = 0;

    42     let nName = aNode.name || null;

    43     for (let n = aNode; (n = n.previousSibling); )

    44       if (n.localName == nLocalName && n.namespaceURI == nNamespaceURI &&

    45           (!nName || n.name == nName))

    46         count++;

    48     // recurse until hitting either the document node or an ID'd node

    49     return this.generate(aNode.parentNode) + "/" + tag +

    50            (nName ? "[@name=" + this.quoteArgument(nName) + "]" : "") +

    51            (count ? "[" + (count + 1) + "]" : "");

    52   },

    54   /**

    55    * Resolves an XPath query generated by XPathGenerator.generate

    56    */

    57   resolve: function sss_xph_resolve(aDocument, aQuery) {

    58     let xptype = Components.interfaces.nsIDOMXPathResult.FIRST_ORDERED_NODE_TYPE;

    59     return aDocument.evaluate(aQuery, aDocument, this.resolveNS, xptype, null).singleNodeValue;

    60   },

    62   /**

    63    * Namespace resolver for the above XPath resolver

    64    */

    65   resolveNS: function sss_xph_resolveNS(aPrefix) {

    66     return XPathGenerator.namespaceURIs[aPrefix] || null;

    67   },

    69   /**

    70    * @returns valid XPath for the given node (usually just the local name itself)

    71    */

    72   escapeName: function sss_xph_escapeName(aName) {

    73     // we can't just use the node's local name, if it contains

    74     // special characters (cf. bug 485482)

    75     return /^\w+$/.test(aName) ? aName :

    76            "*[local-name()=" + this.quoteArgument(aName) + "]";

    77   },

    79   /**

    80    * @returns a properly quoted string to insert into an XPath query

    81    */

    82   quoteArgument: function sss_xph_quoteArgument(aArg) {

    83     return !/'/.test(aArg) ? "'" + aArg + "'" :

    84            !/"/.test(aArg) ? '"' + aArg + '"' :

    85            "concat('" + aArg.replace(/'+/g, "',\"$&\",'") + "')";

    86   },

    88   /**

    89    * @returns an XPath query to all savable form field nodes

    90    */

    91   get restorableFormNodes() {

    92     // for a comprehensive list of all available <INPUT> types see

    93     // http://mxr.mozilla.org/mozilla-central/search?string=kInputTypeTable

    94     let ignoreTypes = ["password", "hidden", "button", "image", "submit", "reset"];

    95     // XXXzeniko work-around until lower-case has been implemented (bug 398389)

    96     let toLowerCase = '"ABCDEFGHIJKLMNOPQRSTUVWXYZ", "abcdefghijklmnopqrstuvwxyz"';

    97     let ignore = "not(translate(@type, " + toLowerCase + ")='" +

    98       ignoreTypes.join("' or translate(@type, " + toLowerCase + ")='") + "')";

    99     let formNodesXPath = "//textarea|//select|//xhtml:textarea|//xhtml:select|" +

   100       "//input[" + ignore + "]|//xhtml:input[" + ignore + "]";

   102     // Special case for about:config's search field.

   103     formNodesXPath += '|/xul:window[@id="config"]//xul:textbox[@id="textbox"]';

   105     delete this.restorableFormNodes;

   106     return (this.restorableFormNodes = formNodesXPath);

   107   }

   108 };

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