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eantiphonal.js
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eantiphonal.js
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'use strict';
const manifest = browser.runtime.getManifest();
const extensionName = manifest.name;
const homepageUrl = manifest.homepage_url;
// TODO replace local URLs with public ones
const apiEndpoint = 'http://localhost:3000/api/eantifonar/search';
class StatusBar {
constructor(elementId) {
this.elementId = elementId;
this.element = document.createElement('div');
this.element.setAttribute('id', this.elementId);
}
// appends an arbitrary node
append(node) {
this.element.appendChild(node);
}
// adds a string, properly wrapped in nodes
print(str) {
let span = document.createElement('span');
span.appendChild(document.createTextNode(str));
this.append(span);
}
}
/* Instrumentates the process of decorating a page with chants */
class EAntiphonal {
constructor(lang, elementGroups) {
this.lang = lang;
this.elementGroups = elementGroups;
this.debug = true;
this.statusBarId = 'eantifonar-statusbar';
this.statusBar = new StatusBar(this.statusBarId);
this.statusBar.append(this.extensionNameLink());
}
run() {
if (this.statusBarExists()) {
console.log('already initialized, looks like extension was reloaded');
return;
}
document.body.prepend(this.statusBar.element);
let elements = [];
let query = [];
this.elementGroups.forEach((obj) => {
doXPath(obj.xpath).forEach((element) => {
this.decorateChantText(element, obj);
elements.push(element);
let lyrics = (obj.textExtractor ? obj.textExtractor : this.extractChantText)(element);
query.push({lyrics: lyrics, lang: this.lang});
});
});
this.statusBar.print(query.length.toString() + ' chants found');
this.loadChants(query, (responseData) => this.addChantsToElements(elements, responseData));
}
extractChantText(node) {
return node.innerText;
}
// allows decorating a detected chant text (before notation is loaded)
decorateChantText(node, group) {
}
// allows decorating a chant text for which notation is not available (after notation is loaded)
decorateChantTextNotationMissing(node) {
}
setUpChantTextAnchor(node, anchorId) {
node.setAttribute('id', anchorId);
}
statusBarExists() {
return null !== document.getElementById(this.statusBarId);
}
extensionNameLink() {
let span = document.createElement('span');
let link = document.createElement('a');
link.setAttribute('href', homepageUrl);
link.appendChild(document.createTextNode(extensionName));
span.appendChild(link);
return span;
}
loadChants(query, callback) {
let payload = {};
query.forEach((item, i) => payload[i.toString()] = item);
fetch(apiEndpoint, {
method: 'POST',
headers: {'Content-Type': 'application/json'},
body: JSON.stringify(payload)
})
.then((response) => {
if (response.status != 200) {
this.statusBar.print('API request unsuccessful (' + response.status.toString() + ')');
console.log(response);
return {};
}
return response.json();
})
.then(callback)
.catch((error) => {
this.statusBar.print('could not make API request: ' + error);
console.error(error);
});
}
addChantsToElements(elements, responseData) {
let notFound = 0;
let notFoundLinks = document.createElement('span');
elements.forEach((chantText, i) => {
let options = responseData[i.toString()];
if (null === options) {
notFound++;
this.decorateChantTextNotationMissing(chantText);
// add link to the chant to the status bar
let notFoundId = 'not-found-' + i;
this.setUpChantTextAnchor(chantText, notFoundId);
let link = document.createElement('a');
link.setAttribute('href', '#' + notFoundId);
link.appendChild(document.createTextNode('[' + i + ']'));
notFoundLinks.appendChild(document.createTextNode(' '));
notFoundLinks.appendChild(link);
return;
}
// for now we take the first option and ignore the rest
let chantData = options[0];
let img = document.createElement('img');
img.setAttribute('src', chantData.image);
img.setAttribute('alt', chantData.lyrics);
let link = document.createElement('a');
link.setAttribute('href', chantData.browse_url);
link.setAttribute('class', 'eantifonar-image-link');
link.appendChild(img);
let parent = chantText.parentNode;
parent.insertBefore(link, chantText.nextSibling);
});
this.statusBar.print('scores loaded' + (notFound > 0 ? ', ' + notFound + ' chant/s missing' : ''));
if (this.debug) {
this.statusBar.append(notFoundLinks);
}
}
}
// do XPath search, return result as Array
const doXPath = (xpathExpression, contextNode = document) => {
const antiphons = document.evaluate(xpathExpression, contextNode, null, XPathResult.ANY_TYPE, null);
let a = null;
let r = [];
while (a = antiphons.iterateNext()) {
r.push(a);
}
return r;
};