Forgot to commit updated utilities...
This commit is contained in:
Simon Kornblith
parent
04730860a6
commit
ed47e0c84c
1 changed files with 632 additions and 83 deletions
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@ -121,6 +121,473 @@ Scholar.Utilities.prototype.cleanTags = function(x) {
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return x.replace(/<[^>]+>/g, "");
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}
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/*
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* END SCHOLAR FOR FIREFOX EXTENSIONS
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*/
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/////////////////////////////////////////////////////////////////
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//
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// Scholar.Utilities.Ingester
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//
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/////////////////////////////////////////////////////////////////
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// Scholar.Utilities.Ingester extends Scholar.Utilities, offering additional
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// classes relating to data extraction specifically from HTML documents.
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Scholar.Utilities.Ingester = function(myWindow, proxiedURL) {
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this.window = myWindow;
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this.proxiedURL = proxiedURL;
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}
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Scholar.Utilities.Ingester.prototype = new Scholar.Utilities();
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// Takes an XPath query and returns the results
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Scholar.Utilities.Ingester.prototype.gatherElementsOnXPath = function(doc, parentNode, xpath, nsResolver) {
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var elmts = [];
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var iterator = doc.evaluate(xpath, parentNode, nsResolver, Components.interfaces.nsIDOMXPathResult.ANY_TYPE,null);
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var elmt = iterator.iterateNext();
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var i = 0;
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while (elmt) {
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elmts[i++] = elmt;
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elmt = iterator.iterateNext();
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}
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return elmts;
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}
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// Loads a single document for a scraper, running succeeded() on success or
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// failed() on failure
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Scholar.Utilities.Ingester.prototype.loadDocument = function(url, browser, succeeded, failed) {
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Scholar.debug("loadDocument called");
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this.processDocuments(browser, null, [ url ], succeeded, function() {}, failed);
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}
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// Downloads and processes documents with processor()
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// browser - a browser object
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// firstDoc - the first document to process with the processor (if null,
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// first document is processed without processor)
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// urls - an array of URLs to load
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// processor - a function to execute to process each document
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// done - a function to execute when all document processing is complete
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// exception - a function to execute if an exception occurs (exceptions are
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// also logged in the Scholar for Firefox log)
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Scholar.Utilities.Ingester.prototype.processDocuments = function(browser, firstDoc, urls, processor, done, exception) {
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var hiddenBrowser = Scholar.Ingester.createHiddenBrowser(this.window);
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var myWindow = this.window;
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var prevUrl, url;
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Scholar.debug("processDocuments called");
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try {
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if (urls.length == 0) {
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if(firstDoc) {
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processor(firstDoc, done);
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} else {
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done();
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}
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return;
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}
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var urlIndex = -1;
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var doLoad = function() {
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urlIndex++;
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if (urlIndex < urls.length) {
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url = urls[urlIndex];
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if(this.proxiedURL) {
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url = Scholar.Ingester.ProxyMonitor.properToProxy(url);
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}
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try {
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Scholar.debug("loading "+url);
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hiddenBrowser.loadURI(url);
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} catch (e) {
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Scholar.debug("Scholar.Utilities.Ingester.processDocuments doLoad: " + e, 2);
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exception(e);
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}
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} else {
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hiddenBrowser.removeEventListener("load", onLoad, true);
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Scholar.Ingester.deleteHiddenBrowser(hiddenBrowser);
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done();
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}
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};
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var onLoad = function() {
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Scholar.debug(hiddenBrowser.contentDocument.location.href+" has been loaded");
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if(hiddenBrowser.contentDocument.location.href != prevUrl) { // Just in case it fires too many times
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prevUrl = hiddenBrowser.contentDocument.location.href;
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try {
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var newHiddenBrowser = new Object();
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newHiddenBrowser.contentDocument = hiddenBrowser.contentDocument;
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newHiddenBrowser.contentWindow = hiddenBrowser.contentWindow;
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processor(newHiddenBrowser);
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} catch (e) {
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Scholar.debug("Scholar.Utilities.Ingester.processDocuments onLoad: " + e, 2);
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exception(e);
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}
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doLoad();
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}
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};
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var init = function() {
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Scholar.debug("init called");
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hiddenBrowser.addEventListener("load", onLoad, true);
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if (firstDoc) {
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Scholar.debug("processing");
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processor(firstDoc, doLoad);
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} else {
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Scholar.debug("doing load");
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doLoad();
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}
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}
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init();
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} catch (e) {
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Scholar.debug("processDocuments: " + e);
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exception(e);
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}
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}
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// Appears to look for links in a document containing a certain substring (kind
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// of like getItemArray, only with NO REGEXP FUNCTIONALITY)
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Scholar.Utilities.Ingester.prototype.collectURLsWithSubstring = function(doc, substring) {
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var urls = [];
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var addedURLs = [];
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var aElements = doc.evaluate("//a", doc, null, Components.interfaces.nsIDOMXPathResult.ANY_TYPE,null);
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var aElement = aElements.iterateNext();
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while (aElement) {
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var href = aElement.href;
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if (href.indexOf(substring) >= 0 && !(addedURLs[href])) {
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urls.unshift(href);
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addedURLs[href] = true;
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}
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aElement = aElements.iterateNext();
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}
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return urls;
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}
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// For now, we're going to skip the getLLsFromAddresses function (which gets
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// latitude and longitude pairs from a series of addresses, but requires the
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// big mess of Java code that is the Piggy Bank server) and the geoHelper
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// tools (which rely on getLLsFromAddresses) since these are probably not
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// essential components for Scholar and would take a great deal of effort to
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// implement. We can, however, always implement them later.
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/*
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* BEGIN SCHOLAR FOR FIREFOX EXTENSIONS
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*/
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/*
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* Gets a given node (assumes only one value)
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*/
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Scholar.Utilities.Ingester.prototype.getNode = function(doc, contextNode, xpath, nsResolver) {
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return doc.evaluate(xpath, contextNode, nsResolver, Components.interfaces.nsIDOMXPathResult.ANY_TYPE, null).iterateNext();
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}
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/*
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* Gets a given node as a string containing all child nodes
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*/
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Scholar.Utilities.Ingester.prototype.getNodeString = function(doc, contextNode, xpath, nsResolver) {
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var elmts = this.gatherElementsOnXPath(doc, contextNode, xpath, nsResolver);
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var returnVar = "";
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for(var i=0; i<elmts.length; i++) {
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returnVar += elmts[i].nodeValue;
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}
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return returnVar;
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}
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/*
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* Allows a user to select which items to scrape
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*/
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Scholar.Utilities.Ingester.prototype.selectItems = function(itemList) {
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// mozillazine made me do it! honest!
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var io = { dataIn:itemList, dataOut:null }
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var newDialog = this.window.openDialog("chrome://scholar/content/ingester/selectitems.xul",
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"_blank","chrome,modal,centerscreen,resizable=yes", io);
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return io.dataOut;
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}
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/*
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* Grabs items based on URLs
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*/
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Scholar.Utilities.Ingester.prototype.getItemArray = function(doc, inHere, urlRe, rejectRe) {
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var availableItems = new Object(); // Technically, associative arrays are objects
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// Require link to match this
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if(urlRe) {
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var urlRegexp = new RegExp();
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urlRegexp.compile(urlRe, "i");
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}
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// Do not allow text to match this
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if(rejectRe) {
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var rejectRegexp = new RegExp();
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rejectRegexp.compile(rejectRe, "i");
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}
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if(!inHere.length) {
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inHere = new Array(inHere);
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}
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for(var j=0; j<inHere.length; j++) {
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var links = inHere[j].getElementsByTagName("a");
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for(var i=0; i<links.length; i++) {
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if(!urlRe || urlRegexp.test(links[i].href)) {
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var text = this.getNodeString(doc, links[i], './/text()', null);
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if(text) {
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text = this.cleanString(text);
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if(!rejectRe || !rejectRegexp.test(text)) {
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if(availableItems[links[i].href]) {
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if(text != availableItems[links[i].href]) {
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availableItems[links[i].href] += " "+text;
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}
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} else {
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availableItems[links[i].href] = text;
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}
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}
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}
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}
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}
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}
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return availableItems;
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}
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// These functions are for use by importMARCRecord. They're private, because,
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// while they are useful, it's also nice if as many of our scrapers as possible
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// are PiggyBank compatible, and if our scrapers used functions, that would
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// break compatibility
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Scholar.Utilities.Ingester.prototype._MARCCleanString = function(author) {
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author = author.replace(/^[\s\.\,\/\[\]\:]+/, '');
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author = author.replace(/[\s\.\,\/\[\]\:]+$/, '');
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return author.replace(/ +/, ' ');
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}
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Scholar.Utilities.Ingester.prototype._MARCCleanNumber = function(author) {
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author = author.replace(/^[\s\.\,\/\[\]\:]+/, '');
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author = author.replace(/[\s\.\,\/\[\]\:]+$/, '');
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var regexp = /^[^ ]*/;
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var m = regexp.exec(author);
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if(m) {
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return m[0];
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}
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}
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Scholar.Utilities.Ingester.prototype._MARCPullYear = function(text) {
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var pullRe = /[0-9]+/;
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var m = pullRe.exec(text);
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if(m) {
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return m[0];
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}
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}
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Scholar.Utilities.Ingester.prototype._MARCAssociateField = function(record, uri, model, fieldNo, rdfUri, execMe, prefix, part) {
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if(!part) {
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part = 'a';
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}
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var field = record.get_field_subfields(fieldNo);
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Scholar.debug('Found '+field.length+' matches for '+fieldNo+part);
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if(field) {
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for(i in field) {
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var value;
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for(var j=0; j<part.length; j++) {
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var myPart = part.substr(j, 1);
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if(field[i][myPart]) {
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if(value) {
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value += " "+field[i][myPart];
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} else {
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value = field[i][myPart];
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}
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}
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}
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if(value) {
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if(execMe) {
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value = execMe(value);
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}
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if(prefix) {
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value = prefix + value;
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}
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model.addStatement(uri, rdfUri, value);
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}
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}
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}
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return model;
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}
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// This is an extension to PiggyBank's architecture. It's here so that we don't
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// need an enormous library for each scraper that wants to use MARC records
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Scholar.Utilities.Ingester.prototype.importMARCRecord = function(record, uri, model) {
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var prefixDC = 'http://purl.org/dc/elements/1.1/';
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var prefixDCMI = 'http://purl.org/dc/dcmitype/';
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var prefixDummy = 'http://chnm.gmu.edu/firefox-scholar/';
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var prefixRDF = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#';
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// Extract ISBNs
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model = this._MARCAssociateField(record, uri, model, '020', prefixDC + 'identifier', this._MARCCleanNumber, 'ISBN ');
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// Extract ISSNs
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model = this._MARCAssociateField(record, uri, model, '022', prefixDC + 'identifier', this._MARCCleanNumber, 'ISSN ');
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// Extract creators
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model = this._MARCAssociateField(record, uri, model, '100', prefixDC + 'creator', this.cleanAuthor);
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model = this._MARCAssociateField(record, uri, model, '110', prefixDummy + 'corporateCreator', this._MARCCleanString);
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model = this._MARCAssociateField(record, uri, model, '111', prefixDummy + 'corporateCreator', this._MARCCleanString);
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model = this._MARCAssociateField(record, uri, model, '700', prefixDC + 'contributor', this.cleanAuthor);
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model = this._MARCAssociateField(record, uri, model, '710', prefixDummy + 'corporateContributor', this._MARCCleanString);
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model = this._MARCAssociateField(record, uri, model, '711', prefixDummy + 'corporateContributor', this._MARCCleanString);
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if(!model.data[uri] || (!model.data[uri][prefixDC + 'creator'] && !model.data[uri][prefixDC + 'contributor'] && !model.data[uri][prefixDummy + 'corporateCreator'] && !model.data[uri][prefixDummy + 'corporateContributor'])) {
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// some LOC entries have no listed author, but have the author in the person subject field as the first entry
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var field = record.get_field_subfields('600');
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if(field[0]) {
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model.addStatement(uri, prefixDC + 'creator', this.cleanAuthor(field[0]['a']));
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}
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}
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// Extract title
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model = this._MARCAssociateField(record, uri, model, '245', prefixDC + 'title', this._MARCCleanString, '', 'ab');
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// Extract edition
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model = this._MARCAssociateField(record, uri, model, '250', prefixDC + 'hasVersion', this._MARCCleanString);
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// Extract place info
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model = this._MARCAssociateField(record, uri, model, '260', prefixDummy + 'place', this._MARCCleanString, '', 'a');
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// Extract publisher info
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model = this._MARCAssociateField(record, uri, model, '260', prefixDC + 'publisher', this._MARCCleanString, '', 'b');
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// Extract year
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model = this._MARCAssociateField(record, uri, model, '260', prefixDC + 'year', this._MARCPullYear, '', 'c');
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// Extract series
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model = this._MARCAssociateField(record, uri, model, '440', prefixDummy + 'series', this._MARCCleanString);
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// Extract call number
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model = this._MARCAssociateField(record, uri, model, '050', prefixDC + 'identifier', this._MARCCleanString, 'LCC ', 'ab');
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model = this._MARCAssociateField(record, uri, model, '060', prefixDC + 'identifier', this._MARCCleanString, 'NLM ', 'ab');
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model = this._MARCAssociateField(record, uri, model, '070', prefixDC + 'identifier', this._MARCCleanString, 'NAL ', 'ab');
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model = this._MARCAssociateField(record, uri, model, '080', prefixDC + 'identifier', this._MARCCleanString, 'UDC ', 'ab');
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model = this._MARCAssociateField(record, uri, model, '082', prefixDC + 'identifier', this._MARCCleanString, 'DDC ', 'a');
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model = this._MARCAssociateField(record, uri, model, '084', prefixDC + 'identifier', this._MARCCleanString, 'CN ', 'ab');
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// Set type
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model = model.addStatement(uri, prefixRDF + 'type', prefixDummy + "book", true);
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}
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/*
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* END SCHOLAR FOR FIREFOX EXTENSIONS
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*/
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// These are front ends for XMLHttpRequest. XMLHttpRequest can't actually be
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// accessed outside the sandbox, and even if it could, it wouldn't let scripts
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// access across domains, so everything's replicated here.
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// Scholar for Firefox Utilities
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// Utilities based on code taken from Piggy Bank 2.1.1 (BSD-licensed)
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// This code is licensed according to the GPL
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/////////////////////////////////////////////////////////////////
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//
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// Scholar.Utilities
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//
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/////////////////////////////////////////////////////////////////
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// Scholar.Utilities class, a set of methods to assist in data
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// extraction. Some of the code here was stolen directly from the Piggy Bank
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// project.
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Scholar.Utilities = function () {}
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// Adapter for Piggy Bank function to print debug messages; log level is
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// fixed at 4 (could change this)
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Scholar.Utilities.prototype.debugPrint = function(msg) {
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Scholar.debug(msg, 4);
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}
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// Appears to trim a string, chopping of newlines/spacing
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Scholar.Utilities.prototype.trimString = function(s) {
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var i = 0;
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var spaceChars = " \n\r\t" + String.fromCharCode(160) /* */;
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while (i < s.length) {
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var c = s.charAt(i);
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if (spaceChars.indexOf(c) < 0) {
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break;
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}
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i++;
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}
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s = s.substring(i);
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i = s.length;
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while (i > 0) {
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var c = s.charAt(i - 1);
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if (spaceChars.indexOf(c) < 0) {
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break;
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}
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i--;
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}
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return s.substring(0, i);
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}
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/*
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* BEGIN SCHOLAR FOR FIREFOX EXTENSIONS
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* Functions below this point are extensions to the utilities provided by
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* Piggy Bank. When used in external code, the repository will need to add
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* a function definition when exporting in Piggy Bank format.
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*/
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/*
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* Converts a JavaScript date object to an ISO-style date
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*/
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Scholar.Utilities.prototype.dateToISO = function(jsDate) {
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var date = "";
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var year = jsDate.getFullYear().toString();
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var month = (jsDate.getMonth()+1).toString();
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var day = jsDate.getDate().toString();
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for(var i = year.length; i<4; i++) {
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date += "0";
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}
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date += year+"-";
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if(month.length == 1) {
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date += "0";
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}
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date += month+"-";
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if(day.length == 1) {
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date += "0";
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}
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date += day;
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return date;
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}
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/*
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* Cleans extraneous punctuation off an author name
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*/
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Scholar.Utilities.prototype.cleanAuthor = function(author) {
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author = author.replace(/^[\s\.\,\/\[\]\:]+/, '');
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author = author.replace(/[\s\,\/\[\]\:\.]+$/, '');
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author = author.replace(/ +/, ' ');
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// Add period for initials
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if(author.substring(author.length-2, author.length-1) == " ") {
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author += ".";
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}
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var splitNames = author.split(', ');
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if(splitNames.length > 1) {
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author = splitNames[1]+' '+splitNames[0];
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}
|
||||
return author;
|
||||
}
|
||||
|
||||
/*
|
||||
* Cleans whitespace off a string and replaces multiple spaces with one
|
||||
*/
|
||||
Scholar.Utilities.prototype.cleanString = function(s) {
|
||||
s = s.replace(/[ \xA0]+/g, " ");
|
||||
return this.trimString(s);
|
||||
}
|
||||
|
||||
/*
|
||||
* Cleans any non-word non-parenthesis characters off the ends of a string
|
||||
*/
|
||||
Scholar.Utilities.prototype.superCleanString = function(x) {
|
||||
var x = x.replace(/^[^\w(]+/, "");
|
||||
return x.replace(/[^\w)]+$/, "");
|
||||
}
|
||||
|
||||
/*
|
||||
* Eliminates HTML tags, replacing <br>s with /ns
|
||||
*/
|
||||
Scholar.Utilities.prototype.cleanTags = function(x) {
|
||||
x = x.replace(/<br[^>]*>/gi, "\n");
|
||||
return x.replace(/<[^>]+>/g, "");
|
||||
}
|
||||
|
||||
// These functions are for use by importMARCRecord. They're private, because,
|
||||
// while they are useful, it's also nice if as many of our scrapers as possible
|
||||
// are PiggyBank compatible, and if our scrapers used functions, that would
|
||||
|
|
@ -461,104 +928,186 @@ Scholar.Utilities.Ingester.prototype.getItemArray = function(doc, inHere, urlRe,
|
|||
* END SCHOLAR FOR FIREFOX EXTENSIONS
|
||||
*/
|
||||
|
||||
// Ingester adapters for Scholar.Utilities.HTTP to handle proxies
|
||||
|
||||
Scholar.Utilities.Ingester.HTTPUtilities = function(proxiedURL) {
|
||||
this.proxiedURL = proxiedURL
|
||||
}
|
||||
|
||||
Scholar.Utilities.Ingester.HTTPUtilities.prototype.doGet = function(url, onStatus, onDone) {
|
||||
if(this.proxiedURL) {
|
||||
url = Scholar.Ingester.ProxyMonitor.properToProxy(url);
|
||||
}
|
||||
Scholar.Utilities.HTTP.doGet(url, onStatus, function(xmlhttp) { onDone(xmlhttp.responseText, xmlhttp) })
|
||||
}
|
||||
|
||||
Scholar.Utilities.Ingester.HTTPUtilities.prototype.doPost = function(url, body, onStatus, onDone) {
|
||||
if(this.proxiedURL) {
|
||||
url = Scholar.Ingester.ProxyMonitor.properToProxy(url);
|
||||
}
|
||||
Scholar.Utilities.HTTP.doPost(url, body, onStatus, function(xmlhttp) { onDone(xmlhttp.responseText, xmlhttp) })
|
||||
}
|
||||
|
||||
Scholar.Utilities.Ingester.HTTPUtilities.prototype.doOptions = function(url, onStatus, onDone) {
|
||||
if(this.proxiedURL) {
|
||||
url = Scholar.Ingester.ProxyMonitor.properToProxy(url);
|
||||
}
|
||||
Scholar.Utilities.HTTP.doOptions(url, onStatus, function(xmlhttp) { onDone(xmlhttp.responseText, xmlhttp) })
|
||||
}
|
||||
|
||||
// These are front ends for XMLHttpRequest. XMLHttpRequest can't actually be
|
||||
// accessed outside the sandbox, and even if it could, it wouldn't let scripts
|
||||
// access across domains, so everything's replicated here.
|
||||
Scholar.Utilities.HTTP = function(contentWindow, proxiedURL) {
|
||||
this.window = contentWindow;
|
||||
this.proxiedURL = proxiedURL;
|
||||
}
|
||||
|
||||
Scholar.Utilities.HTTP.prototype.doGet = function(url, onStatus, onDone) {
|
||||
if(this.proxiedURL) {
|
||||
url = Scholar.Ingester.ProxyMonitor.properToProxy(url);
|
||||
Scholar.Utilities.HTTP = new function() {
|
||||
this.doGet = doGet;
|
||||
this.doPost = doPost;
|
||||
this.doOptions = doOptions;
|
||||
this.browserIsOffline = browserIsOffline;
|
||||
|
||||
/**
|
||||
* Send an HTTP GET request via XMLHTTPRequest
|
||||
*
|
||||
* Returns false if browser is offline
|
||||
**/
|
||||
function doGet(url, onStatus, onDone) {
|
||||
if (this.browserIsOffline()){
|
||||
return false;
|
||||
}
|
||||
|
||||
var xmlhttp = Components.classes["@mozilla.org/xmlextras/xmlhttprequest;1"]
|
||||
.createInstance();
|
||||
|
||||
var test = xmlhttp.open('GET', url, true);
|
||||
|
||||
xmlhttp.onreadystatechange = function(){
|
||||
_stateChange(xmlhttp, onStatus, onDone);
|
||||
};
|
||||
|
||||
xmlhttp.send(null);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
var xmlhttp = new this.window.XMLHttpRequest();
|
||||
|
||||
xmlhttp.open('GET', url, true);
|
||||
xmlhttp.overrideMimeType("text/plain");
|
||||
|
||||
var me = this;
|
||||
xmlhttp.onreadystatechange = function() {
|
||||
me.stateChange(xmlhttp, onStatus, onDone);
|
||||
};
|
||||
xmlhttp.send(null);
|
||||
}
|
||||
|
||||
Scholar.Utilities.HTTP.prototype.doPost = function(url, body, onStatus, onDone) {
|
||||
if(this.proxiedURL) {
|
||||
url = Scholar.Ingester.ProxyMonitor.properToProxy(url);
|
||||
/**
|
||||
* Send an HTTP POST request via XMLHTTPRequest
|
||||
*
|
||||
* Returns false if browser is offline
|
||||
**/
|
||||
function doPost(url, body, onStatus, onDone) {
|
||||
if (this.browserIsOffline()){
|
||||
return false;
|
||||
}
|
||||
if(this.proxiedURL) {
|
||||
url = Scholar.Ingester.ProxyMonitor.properToProxy(url);
|
||||
}
|
||||
|
||||
var xmlhttp = Components.classes["@mozilla.org/xmlextras/xmlhttprequest;1"]
|
||||
.createInstance();
|
||||
|
||||
xmlhttp.open('POST', url, true);
|
||||
|
||||
var me = this;
|
||||
xmlhttp.onreadystatechange = function(){
|
||||
_stateChange(xmlhttp, onStatus, onDone);
|
||||
};
|
||||
|
||||
xmlhttp.send(body);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
var xmlhttp = new this.window.XMLHttpRequest();
|
||||
|
||||
xmlhttp.open('POST', url, true);
|
||||
xmlhttp.overrideMimeType("text/plain");
|
||||
|
||||
var me = this;
|
||||
xmlhttp.onreadystatechange = function() {
|
||||
me.stateChange(xmlhttp, onStatus, onDone);
|
||||
};
|
||||
xmlhttp.send(body);
|
||||
}
|
||||
|
||||
Scholar.Utilities.HTTP.prototype.doOptions = function(url, body, onStatus, onDone) {
|
||||
if(this.proxiedURL) {
|
||||
url = Scholar.Ingester.ProxyMonitor.properToProxy(url);
|
||||
/**
|
||||
* Send an HTTP OPTIONS request via XMLHTTPRequest
|
||||
*
|
||||
* Returns false if browser is offline
|
||||
**/
|
||||
function doOptions(url, body, onStatus, onDone) {
|
||||
if (this.browserIsOffline()){
|
||||
return false;
|
||||
}
|
||||
if(this.proxiedURL) {
|
||||
url = Scholar.Ingester.ProxyMonitor.properToProxy(url);
|
||||
}
|
||||
|
||||
var xmlhttp = Components.classes["@mozilla.org/xmlextras/xmlhttprequest;1"]
|
||||
.createInstance();
|
||||
|
||||
xmlhttp.open('OPTIONS', url, true);
|
||||
|
||||
var me = this;
|
||||
xmlhttp.onreadystatechange = function(){
|
||||
_stateChange(xmlhttp, onStatus, onDone);
|
||||
};
|
||||
|
||||
xmlhttp.send(body);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
var xmlhttp = new this.window.XMLHttpRequest();
|
||||
|
||||
xmlhttp.open('OPTIONS', url, true);
|
||||
xmlhttp.overrideMimeType("text/plain");
|
||||
|
||||
var me = this;
|
||||
xmlhttp.onreadystatechange = function() {
|
||||
me.stateChange(xmlhttp, onStatus, onDone);
|
||||
};
|
||||
xmlhttp.send(body);
|
||||
}
|
||||
|
||||
Scholar.Utilities.HTTP.prototype.stateChange = function(xmlhttp, onStatus, onDone) {
|
||||
switch (xmlhttp.readyState) {
|
||||
|
||||
// Request not yet made
|
||||
case 1:
|
||||
break;
|
||||
|
||||
// Contact established with server but nothing downloaded yet
|
||||
case 2:
|
||||
try {
|
||||
function browserIsOffline() {
|
||||
return Components.classes["@mozilla.org/network/io-service;1"]
|
||||
.getService(Components.interfaces.nsIIOService).offline;
|
||||
}
|
||||
|
||||
|
||||
function _stateChange(xmlhttp, onStatus, onDone){
|
||||
if(!onDone) {
|
||||
onStatus = null;
|
||||
onDone = onStatus;
|
||||
}
|
||||
switch (xmlhttp.readyState){
|
||||
// Request not yet made
|
||||
case 1:
|
||||
break;
|
||||
|
||||
// Contact established with server but nothing downloaded yet
|
||||
case 2:
|
||||
// Accessing status will throw an exception if no network connection
|
||||
try {
|
||||
xmlhttp.status;
|
||||
}
|
||||
catch (e){
|
||||
Scholar.debug('No network connection');
|
||||
xmlhttp.noNetwork = true;
|
||||
return false;
|
||||
}
|
||||
|
||||
// Check for HTTP status 200
|
||||
if (xmlhttp.status != 200) {
|
||||
if (onStatus) {
|
||||
onStatus(
|
||||
xmlhttp.status,
|
||||
xmlhttp.statusText,
|
||||
xmlhttp
|
||||
);
|
||||
xmlhttp.abort();
|
||||
if (xmlhttp.status != 200){
|
||||
Scholar.debug('XMLHTTPRequest received HTTP response code '
|
||||
+ xmlhttp.status);
|
||||
if(onStatus) {
|
||||
try {
|
||||
onStatus(
|
||||
xmlhttp.status,
|
||||
xmlhttp.statusText,
|
||||
xmlhttp
|
||||
);
|
||||
} catch (e) {
|
||||
Scholar.debug(e, 2);
|
||||
}
|
||||
}
|
||||
}
|
||||
} catch (e) {
|
||||
Scholar.debug(e, 2);
|
||||
}
|
||||
break;
|
||||
|
||||
// Called multiple while downloading in progress
|
||||
case 3:
|
||||
break;
|
||||
|
||||
// Download complete
|
||||
case 4:
|
||||
try {
|
||||
if (onDone) {
|
||||
onDone(xmlhttp.responseText, xmlhttp);
|
||||
break;
|
||||
|
||||
// Called multiple while downloading in progress
|
||||
case 3:
|
||||
break;
|
||||
|
||||
// Download complete
|
||||
case 4:
|
||||
try {
|
||||
if (onDone){
|
||||
onDone(xmlhttp);
|
||||
}
|
||||
}
|
||||
} catch (e) {
|
||||
Scholar.debug(e, 2);
|
||||
}
|
||||
break;
|
||||
catch (e){
|
||||
Scholar.debug(e, 2);
|
||||
}
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in a new issue