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jpwhitaker/hn_filter.js

Created August 1, 2016 21:48
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hn_filter.js
function hn_filter(/* terms1, terms2, ..., termsN, removeMisses */) {
var termSets = Array.prototype.slice.call(arguments),
removeMisses = typeof(termSets[termSets.length - 1]) === 'boolean' ? termSets.pop() : false,
haystack = document.querySelectorAll('span.comment');
return Array.prototype.slice.call(haystack).filter(function(post) {
var hit = termSets.reduce(function(result, terms) {
return terms.reduce(function(result, term) {
var index = post.innerHTML.search(new RegExp(term, 'i'));
if (index === -1) return result;
post.innerHTML = [
post.innerHTML.substring(0, index),
'<span style="background-color:#03ffe8;">' + term + '</span>',
post.innerHTML.substring(index + term.length)
].join('');
return true;
}, false) && result;
}, true);
if (!hit && removeMisses) _remove(post);
return hit;
}).length;
function _remove(element) {
var holder = element;
while (holder.parentElement && !holder.id) holder = holder.parentElement;
holder.parentElement.removeChild(holder);
}
}
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