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98 lines
2.6 KiB
JavaScript
98 lines
2.6 KiB
JavaScript
5 years ago
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/*
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* HTMLParser - This implementation of parser assumes we are parsing HTML in browser
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* and user DOM methods available in browser for parsing HTML.
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*
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* @author Himanshu Gilani
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*
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*/
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var HTMLParser = function(node, handler, opts) {
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opts = opts || {};
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var nodesToIgnore = opts['nodesToIgnore'] || [];
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var parseHiddenNodes = opts['parseHiddenNodes'] || 'false';
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var c = node.childNodes;
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for ( var i = 0; i < c.length; i++) {
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try {
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var ignore = false;
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for(var k=0; k< nodesToIgnore.length; k++) {
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if(c[i].nodeName.toLowerCase() == nodesToIgnore[k]) {
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ignore= true;
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break;
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}
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}
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//NOTE hidden node testing is expensive in FF.
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if (ignore || (!parseHiddenNodes && isHiddenNode(c[i])) ){
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continue;
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}
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if (c[i].nodeName.toLowerCase() != "#text" && c[i].nodeName.toLowerCase() != "#comment") {
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var attrs = [];
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if (c[i].hasAttributes()) {
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var attributes = c[i].attributes;
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for ( var a = 0; a < attributes.length; a++) {
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var attribute = attributes.item(a);
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attrs.push({
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name : attribute.nodeName,
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value : attribute.nodeValue,
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});
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}
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}
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if (handler.start) {
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if (c[i].hasChildNodes()) {
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handler.start(c[i].nodeName, attrs, false);
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if (c[i].nodeName.toLowerCase() == "pre" || c[i].nodeName.toLowerCase() == "code") {
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handler.chars(c[i].innerHTML);
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} else if (c[i].nodeName.toLowerCase() == "iframe" || c[i].nodeName.toLowerCase() == "frame") {
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if (c[i].contentDocument && c[i].contentDocument.documentElement) {
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return HTMLParser(c[i].contentDocument.documentElement, handler, opts);
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}
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} else if (c[i].hasChildNodes()) {
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HTMLParser(c[i], handler, opts);
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}
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if (handler.end) {
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handler.end(c[i].nodeName);
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}
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} else {
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handler.start(c[i].nodeName, attrs, true);
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}
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}
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} else if (c[i].nodeName.toLowerCase() == "#text") {
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if (handler.chars) {
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handler.chars(c[i].nodeValue);
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}
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} else if (c[i].nodeName.toLowerCase() == "#comment") {
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if (handler.comment) {
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handler.comment(c[i].nodeValue);
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}
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}
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} catch (e) {
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//properly log error
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console.log("error while parsing node: " + c[i].nodeName.toLowerCase());
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}
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}
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};
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function isHiddenNode(node) {
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if(node.nodeName.toLowerCase() == "title"){
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return false;
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}
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if (window.getComputedStyle) {
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try {
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var style = window.getComputedStyle(node, null);
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if (style.getPropertyValue && style.getPropertyValue('display') == 'none') {
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return true;
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}
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} catch (e) {
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// consume and ignore. node styles are not accessible
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}
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return false;
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}
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}
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