зеркало из https://github.com/mozilla/gecko-dev.git
120 строки
4.2 KiB
JavaScript
120 строки
4.2 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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this.EXPORTED_SYMBOLS = ["XPathGenerator"];
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this.XPathGenerator = {
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// these two hashes should be kept in sync
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namespaceURIs: {
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"xhtml": "http://www.w3.org/1999/xhtml",
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"xul": "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
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},
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namespacePrefixes: {
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"http://www.w3.org/1999/xhtml": "xhtml",
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"http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul": "xul"
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},
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/**
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* Generates an approximate XPath query to an (X)HTML node
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*/
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generate: function sss_xph_generate(aNode) {
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// have we reached the document node already?
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if (!aNode.parentNode)
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return "";
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// Access localName, namespaceURI just once per node since it's expensive.
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let nNamespaceURI = aNode.namespaceURI;
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let nLocalName = aNode.localName;
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let prefix = this.namespacePrefixes[nNamespaceURI] || null;
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let tag = (prefix ? prefix + ":" : "") + this.escapeName(nLocalName);
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// stop once we've found a tag with an ID
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if (aNode.id)
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return "//" + tag + "[@id=" + this.quoteArgument(aNode.id) + "]";
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// count the number of previous sibling nodes of the same tag
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// (and possible also the same name)
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let count = 0;
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let nName = aNode.name || null;
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for (let n = aNode; (n = n.previousSibling); )
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if (n.localName == nLocalName && n.namespaceURI == nNamespaceURI &&
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(!nName || n.name == nName))
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count++;
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// recurse until hitting either the document node or an ID'd node
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return this.generate(aNode.parentNode) + "/" + tag +
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(nName ? "[@name=" + this.quoteArgument(nName) + "]" : "") +
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(count ? "[" + (count + 1) + "]" : "");
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},
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/**
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* Resolves an XPath query generated by XPathGenerator.generate
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*/
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resolve: function sss_xph_resolve(aDocument, aQuery) {
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let xptype = Components.interfaces.nsIDOMXPathResult.FIRST_ORDERED_NODE_TYPE;
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return aDocument.evaluate(aQuery, aDocument, this.resolveNS, xptype, null).singleNodeValue;
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},
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/**
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* Namespace resolver for the above XPath resolver
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*/
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resolveNS: function sss_xph_resolveNS(aPrefix) {
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return XPathGenerator.namespaceURIs[aPrefix] || null;
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},
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/**
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* @returns valid XPath for the given node (usually just the local name itself)
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*/
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escapeName: function sss_xph_escapeName(aName) {
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// we can't just use the node's local name, if it contains
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// special characters (cf. bug 485482)
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return /^\w+$/.test(aName) ? aName :
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"*[local-name()=" + this.quoteArgument(aName) + "]";
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},
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/**
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* @returns a properly quoted string to insert into an XPath query
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*/
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quoteArgument: function sss_xph_quoteArgument(aArg) {
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if (!/'/.test(aArg))
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return "'" + aArg + "'";
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if (!/"/.test(aArg))
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return '"' + aArg + '"';
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return "concat('" + aArg.replace(/'+/g, "',\"$&\",'") + "')";
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},
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/**
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* @returns an XPath query to all savable form field nodes
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*/
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get restorableFormNodes() {
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// for a comprehensive list of all available <INPUT> types see
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// https://dxr.mozilla.org/mozilla-central/search?q=kInputTypeTable&redirect=false
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let ignoreInputs = new Map([
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["type", ["password", "hidden", "button", "image", "submit", "reset"]],
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["autocomplete", ["off"]]
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]);
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// XXXzeniko work-around until lower-case has been implemented (bug 398389)
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let toLowerCase = '"ABCDEFGHIJKLMNOPQRSTUVWXYZ", "abcdefghijklmnopqrstuvwxyz"';
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let ignores = [];
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for (let [attrName, attrValues] of ignoreInputs) {
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for (let attrValue of attrValues)
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ignores.push(`translate(@${attrName}, ${toLowerCase})='${attrValue}'`);
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}
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let ignore = `not(${ignores.join(" or ")})`;
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let formNodesXPath = `//textarea[${ignore}]|//xhtml:textarea[${ignore}]|` +
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`//select[${ignore}]|//xhtml:select[${ignore}]|` +
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`//input[${ignore}]|//xhtml:input[${ignore}]`;
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// Special case for about:config's search field.
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formNodesXPath += '|/xul:window[@id="config"]//xul:textbox[@id="textbox"]';
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delete this.restorableFormNodes;
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return (this.restorableFormNodes = formNodesXPath);
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}
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};
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