83 lines
2.5 KiB
JavaScript
83 lines
2.5 KiB
JavaScript
let lastNotification = "";
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function surroundText(haystack, wordList, padding) {
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let surroundingText = "";
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wordList.forEach(word => {
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if (word.idx < 0)
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return;
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const start = Math.max(0, word.idx - padding);
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const end = word.idx + word.length + padding;
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if (start > 0)
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surroundingText += "...";
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surroundingText += haystack.slice(start, end).trim();
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if (end < haystack.length)
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surroundingText += "...";
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surroundingText += "<br>";
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});
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return surroundingText.trim();
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}
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function simpleMatch(captions, words) {
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const wordList = words.map(word => ({
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idx: captions.toLowerCase().indexOf(word.toLowerCase()),
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length: word.length
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})).filter(i => i.idx >= 0);
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const surroundingText = surroundText(captions, wordList, 10);
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return [ wordList.length, surroundingText ];
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}
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function advancedMatch(captions, regex, flags) {
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const reg = RegExp(regex, flags);
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let wordList = [];
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if (reg.global) {
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wordList = [...captions.matchAll(reg)].map(i => ({ idx: i.index, length: i[0].length }));
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} else {
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const match = captions.match(reg);
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if (match.length)
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wordList = [ {idx: match.index, length: match[0].length} ];
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}
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const surroundingText = surroundText(captions, wordList, 10);
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return [ Boolean(wordList.length), surroundingText ];
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}
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function captionUpdate() {
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const captions = [...document.querySelector(".a4cQT").children].map(i => i.innerText).reduce((i, j) => i + "\n" + j);
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browser.storage.local.get(["advanced", "flags", "regex", "words"])
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.then(storage => {
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let surroundingText = "";
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let matched = false;
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if (storage.advanced) {
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[ matched, surroundingText ] = advancedMatch(captions, storage.regex, storage.flags);
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} else {
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[ matched, surroundingText ] = simpleMatch(captions, storage.words);
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}
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/* The lastNotification prevents repetitive notifications because
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* of constant updates.
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*/
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if (matched && surroundingText !== lastNotification) {
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browser.runtime.sendMessage({
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type: "match",
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match: surroundingText
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});
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lastNotification = surroundingText;
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}
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})
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}
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/* The script gets injected when the "Ask to join" page. However, captions
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* element isn't shown until you actually join the meeting, so a 0.5s loop lets
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* us add a listener whenever it shows up.
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*/
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function setupListener() {
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const captionElement = document.querySelector(".a4cQT");
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if (captionElement === null) {
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setTimeout(setupListener, 500);
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return;
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}
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const config = { subtree: true, childList: true };
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const observer = new MutationObserver(captionUpdate);
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observer.observe(captionElement, config);
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}
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setupListener();
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