The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/toolkit/modules/sessionstore/XPathGenerator.jsm	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,108 @@
     1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
     1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this file,
     1.6 + * You can obtain one at http://mozilla.org/MPL/2.0/. */
     1.7 +
     1.8 +"use strict";
     1.9 +
    1.10 +this.EXPORTED_SYMBOLS = ["XPathGenerator"];
    1.11 +
    1.12 +this.XPathGenerator = {
    1.13 +  // these two hashes should be kept in sync
    1.14 +  namespaceURIs:     {
    1.15 +    "xhtml": "http://www.w3.org/1999/xhtml",
    1.16 +    "xul": "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
    1.17 +  },
    1.18 +  namespacePrefixes: {
    1.19 +    "http://www.w3.org/1999/xhtml": "xhtml",
    1.20 +    "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul": "xul"
    1.21 +  },
    1.22 +
    1.23 +  /**
    1.24 +   * Generates an approximate XPath query to an (X)HTML node
    1.25 +   */
    1.26 +  generate: function sss_xph_generate(aNode) {
    1.27 +    // have we reached the document node already?
    1.28 +    if (!aNode.parentNode)
    1.29 +      return "";
    1.30 +
    1.31 +    // Access localName, namespaceURI just once per node since it's expensive.
    1.32 +    let nNamespaceURI = aNode.namespaceURI;
    1.33 +    let nLocalName = aNode.localName;
    1.34 +
    1.35 +    let prefix = this.namespacePrefixes[nNamespaceURI] || null;
    1.36 +    let tag = (prefix ? prefix + ":" : "") + this.escapeName(nLocalName);
    1.37 +
    1.38 +    // stop once we've found a tag with an ID
    1.39 +    if (aNode.id)
    1.40 +      return "//" + tag + "[@id=" + this.quoteArgument(aNode.id) + "]";
    1.41 +
    1.42 +    // count the number of previous sibling nodes of the same tag
    1.43 +    // (and possible also the same name)
    1.44 +    let count = 0;
    1.45 +    let nName = aNode.name || null;
    1.46 +    for (let n = aNode; (n = n.previousSibling); )
    1.47 +      if (n.localName == nLocalName && n.namespaceURI == nNamespaceURI &&
    1.48 +          (!nName || n.name == nName))
    1.49 +        count++;
    1.50 +
    1.51 +    // recurse until hitting either the document node or an ID'd node
    1.52 +    return this.generate(aNode.parentNode) + "/" + tag +
    1.53 +           (nName ? "[@name=" + this.quoteArgument(nName) + "]" : "") +
    1.54 +           (count ? "[" + (count + 1) + "]" : "");
    1.55 +  },
    1.56 +
    1.57 +  /**
    1.58 +   * Resolves an XPath query generated by XPathGenerator.generate
    1.59 +   */
    1.60 +  resolve: function sss_xph_resolve(aDocument, aQuery) {
    1.61 +    let xptype = Components.interfaces.nsIDOMXPathResult.FIRST_ORDERED_NODE_TYPE;
    1.62 +    return aDocument.evaluate(aQuery, aDocument, this.resolveNS, xptype, null).singleNodeValue;
    1.63 +  },
    1.64 +
    1.65 +  /**
    1.66 +   * Namespace resolver for the above XPath resolver
    1.67 +   */
    1.68 +  resolveNS: function sss_xph_resolveNS(aPrefix) {
    1.69 +    return XPathGenerator.namespaceURIs[aPrefix] || null;
    1.70 +  },
    1.71 +
    1.72 +  /**
    1.73 +   * @returns valid XPath for the given node (usually just the local name itself)
    1.74 +   */
    1.75 +  escapeName: function sss_xph_escapeName(aName) {
    1.76 +    // we can't just use the node's local name, if it contains
    1.77 +    // special characters (cf. bug 485482)
    1.78 +    return /^\w+$/.test(aName) ? aName :
    1.79 +           "*[local-name()=" + this.quoteArgument(aName) + "]";
    1.80 +  },
    1.81 +
    1.82 +  /**
    1.83 +   * @returns a properly quoted string to insert into an XPath query
    1.84 +   */
    1.85 +  quoteArgument: function sss_xph_quoteArgument(aArg) {
    1.86 +    return !/'/.test(aArg) ? "'" + aArg + "'" :
    1.87 +           !/"/.test(aArg) ? '"' + aArg + '"' :
    1.88 +           "concat('" + aArg.replace(/'+/g, "',\"$&\",'") + "')";
    1.89 +  },
    1.90 +
    1.91 +  /**
    1.92 +   * @returns an XPath query to all savable form field nodes
    1.93 +   */
    1.94 +  get restorableFormNodes() {
    1.95 +    // for a comprehensive list of all available <INPUT> types see
    1.96 +    // http://mxr.mozilla.org/mozilla-central/search?string=kInputTypeTable
    1.97 +    let ignoreTypes = ["password", "hidden", "button", "image", "submit", "reset"];
    1.98 +    // XXXzeniko work-around until lower-case has been implemented (bug 398389)
    1.99 +    let toLowerCase = '"ABCDEFGHIJKLMNOPQRSTUVWXYZ", "abcdefghijklmnopqrstuvwxyz"';
   1.100 +    let ignore = "not(translate(@type, " + toLowerCase + ")='" +
   1.101 +      ignoreTypes.join("' or translate(@type, " + toLowerCase + ")='") + "')";
   1.102 +    let formNodesXPath = "//textarea|//select|//xhtml:textarea|//xhtml:select|" +
   1.103 +      "//input[" + ignore + "]|//xhtml:input[" + ignore + "]";
   1.104 +
   1.105 +    // Special case for about:config's search field.
   1.106 +    formNodesXPath += '|/xul:window[@id="config"]//xul:textbox[@id="textbox"]';
   1.107 +
   1.108 +    delete this.restorableFormNodes;
   1.109 +    return (this.restorableFormNodes = formNodesXPath);
   1.110 +  }
   1.111 +};