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import { getHighlighter as getShikiHighlighter } from 'shiki';
import { themes } from './shiki-themes.js';
import { languages } from './shiki-languages.js';
// Caches Promise<Highlighter> for reuse when the same theme and langs are provided
const _resolvedHighlighters = new Map();
/** @type {Promise<any>} */
let _allLanguages;
function stringify(opts) {
// Always sort keys before stringifying to make sure objects match regardless of parameter ordering
return JSON.stringify(opts, Object.keys(opts).sort());
}
/**
* @param {import('shiki').HighlighterOptions} opts
* @returns {Promise<import('shiki').HighlighterOptions>}
*/
export async function resolveHighlighterOptions(opts) {
const resolvedThemes = [];
if (opts.theme && opts.theme in themes) {
resolvedThemes.push(await themes[opts.theme]());
} else if (Object.keys(opts.theme).length) {
resolvedThemes.push(opts.theme);
}
let resolvedLanguages;
if (opts.langs) {
resolvedLanguages = opts.langs;
} else {
if (!_allLanguages) {
_allLanguages = (await Promise.all(Object.values(languages).map((fn) => fn()))).filter(
Boolean
);
}
resolvedLanguages = await _allLanguages;
}
/** @type {import('shiki').HighlighterOptions} */
const highlighterOptions = {
...opts,
themes: resolvedThemes,
langs: resolvedLanguages,
};
// Do not pass through the theme as that will attempt to load it, even if it's included in themes
delete highlighterOptions['theme'];
return highlighterOptions;
}
/**
* @param {import('shiki').HighlighterOptions} opts
* @returns {Promise<import('shiki').Highlighter>}
*/
async function resolveHighlighter(opts) {
const highlighterOptions = await resolveHighlighterOptions(opts);
// Start the async getHighlighter call and cache the Promise
const highlighter = getShikiHighlighter(highlighterOptions).then((hl) => {
hl.setColorReplacements({
'#000001': 'var(--astro-code-color-text)',
'#000002': 'var(--astro-code-color-background)',
'#000004': 'var(--astro-code-token-constant)',
'#000005': 'var(--astro-code-token-string)',
'#000006': 'var(--astro-code-token-comment)',
'#000007': 'var(--astro-code-token-keyword)',
'#000008': 'var(--astro-code-token-parameter)',
'#000009': 'var(--astro-code-token-function)',
'#000010': 'var(--astro-code-token-string-expression)',
'#000011': 'var(--astro-code-token-punctuation)',
'#000012': 'var(--astro-code-token-link)',
});
return hl;
});
return highlighter;
}
/**
* @param {import('shiki').HighlighterOptions} opts
* @returns {Promise<import('shiki').Highlighter>}
*/
export function getHighlighter(opts) {
const key = stringify(opts);
// Highlighter has already been requested, reuse the same instance
if (_resolvedHighlighters.has(key)) {
return _resolvedHighlighters.get(key);
}
const highlighter = resolveHighlighter(opts);
_resolvedHighlighters.set(key, highlighter);
return highlighter;
}
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