The Tor Browser / file comparison
comparison: toolkit/modules/sessionstore/XPathGenerator.jsm
toolkit/modules/sessionstore/XPathGenerator.jsm
- changeset 0
- 6474c204b198
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| -1:000000000000 | 0:7e5736822b7b |
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| 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/. */ | |
| 4 | |
| 5 "use strict"; | |
| 6 | |
| 7 this.EXPORTED_SYMBOLS = ["XPathGenerator"]; | |
| 8 | |
| 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 }, | |
| 19 | |
| 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 ""; | |
| 27 | |
| 28 // Access localName, namespaceURI just once per node since it's expensive. | |
| 29 let nNamespaceURI = aNode.namespaceURI; | |
| 30 let nLocalName = aNode.localName; | |
| 31 | |
| 32 let prefix = this.namespacePrefixes[nNamespaceURI] || null; | |
| 33 let tag = (prefix ? prefix + ":" : "") + this.escapeName(nLocalName); | |
| 34 | |
| 35 // stop once we've found a tag with an ID | |
| 36 if (aNode.id) | |
| 37 return "//" + tag + "[@id=" + this.quoteArgument(aNode.id) + "]"; | |
| 38 | |
| 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++; | |
| 47 | |
| 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 }, | |
| 53 | |
| 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 }, | |
| 61 | |
| 62 /** | |
| 63 * Namespace resolver for the above XPath resolver | |
| 64 */ | |
| 65 resolveNS: function sss_xph_resolveNS(aPrefix) { | |
| 66 return XPathGenerator.namespaceURIs[aPrefix] || null; | |
| 67 }, | |
| 68 | |
| 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+$/.test(aName) ? aName : | |
| 76 "*[local-name()=" + this.quoteArgument(aName) + "]"; | |
| 77 }, | |
| 78 | |
| 79 /** | |
| 80 * @returns a properly quoted string to insert into an XPath query | |
| 81 */ | |
| 82 quoteArgument: function sss_xph_quoteArgument(aArg) { | |
| 83 return !/'/.test(aArg) ? "'" + aArg + "'" : | |
| 84 !/"/.test(aArg) ? '"' + aArg + '"' : | |
| 85 "concat('" + aArg.replace(/'+/g, "',\"$&\",'") + "')"; | |
| 86 }, | |
| 87 | |
| 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 + "]"; | |
| 101 | |
| 102 // Special case for about:config's search field. | |
| 103 formNodesXPath += '|/xul:window[@id="config"]//xul:textbox[@id="textbox"]'; | |
| 104 | |
| 105 delete this.restorableFormNodes; | |
| 106 return (this.restorableFormNodes = formNodesXPath); | |
| 107 } | |
| 108 }; |
