72 lines
2.3 KiB
JavaScript
72 lines
2.3 KiB
JavaScript
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import CSL from 'citeproc';
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import { templates } from './styles.js';
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import { locales } from './locales.js';
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const proxied = Symbol.for('proxied');
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const getWrapperProxy = function (original) {
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const proxy = function (state, entry) {
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if (state.sys.wrapBibliographyEntry) {
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const [prefix, postfix] = state.sys.wrapBibliographyEntry(this.system_id);
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entry = [prefix, entry, postfix].join('');
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}
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return original.call(this, state, entry);
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};
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proxy[proxied] = true;
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return proxy;
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};
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for (const format in CSL.Output.Formats) {
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const original = CSL.Output.Formats[format]['@bibliography/entry'];
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if (!original || original[proxied]) {
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continue;
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}
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CSL.Output.Formats[format]['@bibliography/entry'] = getWrapperProxy(original);
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}
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function retrieveLocale(locale) {
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if (locales.has(locale)) {
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return locales.get(locale);
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}
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const unnormalised = locale.replace('-', '_');
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if (locales.has(unnormalised)) {
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return locales.get(unnormalised);
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}
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return {};
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}
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const engines = {};
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const fetchEngine = function (style, locale, styleXml, retrieveItem, retrieveLocale) {
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const engineHash = `${style}|${locale}`;
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let engine;
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if (engines[engineHash] instanceof CSL.Engine) {
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engine = engines[engineHash];
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engine.sys.retrieveItem = retrieveItem;
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engine.sys.wrapBibliographyEntry = undefined;
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engine.updateItems([]);
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} else {
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engine = engines[engineHash] = new CSL.Engine({
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retrieveLocale,
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retrieveItem
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}, styleXml, locale, true);
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}
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return engine;
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};
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const prepareEngine = function (data, style, locale, format) {
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if (!CSL.Output.Formats[format] || !CSL.Output.Formats[format]['@bibliography/entry']) {
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throw new TypeError(`Cannot find format '${format}'`);
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}
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const items = data.reduce((store, entry) => {
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store[entry.id] = entry;
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return store;
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}, {});
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const template = templates.get(templates.has(style) ? style : 'apa');
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locale = locales.has(locale) ? locale : undefined;
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const callback = function (key) {
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if (Object.prototype.hasOwnProperty.call(items, key)) {
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return items[key];
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} else {
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throw new Error(`Cannot find entry with id '${key}'`);
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}
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};
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const engine = fetchEngine(style, locale, template, callback, retrieveLocale);
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engine.setOutputFormat(format);
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return engine;
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};
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export default prepareEngine;
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export { fetchEngine };
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