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import {
createContext,
FC,
ReactNode,
useCallback,
useContext,
useEffect,
useState,
} from 'react';
import { useAttributes, useLocalStorage, useQuerySelectorAll } from '../hooks';
export type PrismTheme = 'dark' | 'light' | 'system';
export type ResolvedPrismTheme = Exclude<PrismTheme, 'system'>;
export type UsePrismThemeProps = {
themes: PrismTheme[];
theme?: PrismTheme;
setTheme: (theme: PrismTheme) => void;
resolvedTheme?: ResolvedPrismTheme;
codeBlocks?: NodeListOf<HTMLPreElement>;
};
export type PrismThemeProviderProps = {
attribute?: string;
children: ReactNode;
storageKey?: string;
themes?: PrismTheme[];
};
export const PrismThemeContext = createContext<UsePrismThemeProps>({
themes: ['dark', 'light', 'system'],
setTheme: (_) => {
// This is intentional.
},
});
export const usePrismTheme = () => useContext(PrismThemeContext);
/**
* Check if user prefers dark color scheme.
*
* @returns {boolean|undefined} True if `prefers-color-scheme` is set to `dark`.
*/
const prefersDarkScheme = (): boolean | undefined => {
if (typeof window === 'undefined') return;
return (
window.matchMedia &&
window.matchMedia('(prefers-color-scheme: dark)').matches
);
};
/**
* Check if a given string is a Prism theme name.
*
* @param {string} theme - A string.
* @returns {boolean} True if the given string match a Prism theme name.
*/
const isValidTheme = (theme: string): boolean => {
return theme === 'dark' || theme === 'light' || theme === 'system';
};
export const PrismThemeProvider: FC<PrismThemeProviderProps> = ({
attribute = 'data-prismjs-color-scheme-current',
storageKey = 'prismjs-color-scheme',
themes = ['dark', 'light', 'system'],
children,
}) => {
/**
* Retrieve the theme to use depending on `prefers-color-scheme`.
*/
const getThemeFromSystem = useCallback(() => {
return prefersDarkScheme() ? 'dark' : 'light';
}, []);
const { value: prismTheme, setValue: setPrismTheme } =
useLocalStorage<PrismTheme>(storageKey, 'system');
useEffect(() => {
if (!isValidTheme(prismTheme)) setPrismTheme('system');
}, [prismTheme, setPrismTheme]);
const [resolvedTheme, setResolvedTheme] = useState<ResolvedPrismTheme>();
useEffect(() => {
if (prismTheme === 'dark' || prismTheme === 'light') {
setResolvedTheme(prismTheme);
} else {
setResolvedTheme(getThemeFromSystem());
}
}, [prismTheme, getThemeFromSystem]);
const updateResolvedTheme = useCallback(() => {
setResolvedTheme(getThemeFromSystem());
}, [getThemeFromSystem]);
useEffect(() => {
window
.matchMedia('(prefers-color-scheme: dark)')
.addEventListener('change', updateResolvedTheme);
return () =>
window
.matchMedia('(prefers-color-scheme: dark)')
.removeEventListener('change', updateResolvedTheme);
}, [updateResolvedTheme]);
const preTags = useQuerySelectorAll<'pre'>('pre');
useAttributes({ elements: preTags, attribute, value: prismTheme });
/**
* Listen for changes on pre attributes and update theme.
*/
const listenAttributeChange = useCallback(
(pre: HTMLPreElement) => {
var observer = new MutationObserver(function (mutations) {
mutations.forEach((record) => {
var mutatedPre = record.target as HTMLPreElement;
var newTheme = mutatedPre.getAttribute(attribute) as PrismTheme;
setPrismTheme(newTheme);
});
});
observer.observe(pre, {
attributes: true,
attributeFilter: [attribute],
});
},
[attribute, setPrismTheme]
);
useEffect(() => {
if (!preTags) return;
preTags.forEach(listenAttributeChange);
}, [preTags, listenAttributeChange]);
return (
<PrismThemeContext.Provider
value={{
themes,
theme: prismTheme,
setTheme: setPrismTheme,
codeBlocks: preTags,
resolvedTheme,
}}
>
{children}
</PrismThemeContext.Provider>
);
};
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