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import { memoize } from 'lodash';
const parser = new DOMParser();
export default class AssetResolver {
constructor({ renderMarkdown }) {
this.renderMarkdown = renderMarkdown;
}
resolveUrl = memoize(async (canonicalSrc) => {
const html = await this.renderMarkdown(`[link](${canonicalSrc})`);
if (!html) return canonicalSrc;
const { body } = parser.parseFromString(html, 'text/html');
return body.querySelector('a').getAttribute('href');
});
resolveReference = memoize(async (originalText) => {
const text = originalText.replace(/(\+|\+s)$/, '');
const toRender = `${text} ${text}+ ${text}+s`;
const html = await this.renderMarkdown(toRender);
if (!html) return {};
const { body } = parser.parseFromString(html, 'text/html');
const a = body.querySelectorAll('a');
if (!a.length) return {};
return {
href: a[0].getAttribute('href'),
text: a[0].textContent,
expandedText: a[1].textContent,
fullyExpandedText: a[2].textContent,
};
});
renderDiagram = memoize(async (code, language) => {
const backticks = '`'.repeat(4);
const html = await this.renderMarkdown(`${backticks}${language}\n${code}\n${backticks}`);
const { body } = parser.parseFromString(html, 'text/html');
const img = body.querySelector('img');
if (!img) return '';
return img.dataset.src || img.getAttribute('src');
});
}
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