54 lines
1.8 KiB
TypeScript
54 lines
1.8 KiB
TypeScript
// Copyright: Ankitects Pty Ltd and contributors
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// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
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/// Keep property if true.
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type StylingPredicate = (property: string, value: string) => boolean;
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const keep = (_key: string, _value: string) => true;
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const discard = (_key: string, _value: string) => false;
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/// Return a function that filters out certain styles.
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/// - If the style is listed in `exceptions`, the provided predicate is used.
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/// - If the style is not listed, the default predicate is used instead.
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function filterStyling(
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defaultPredicate: StylingPredicate,
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exceptions: Record<string, StylingPredicate>,
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): (element: HTMLElement) => void {
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return (element: HTMLElement): void => {
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// jsdom does not support @@iterator, so manually iterate
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const toRemove = [] as string[];
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for (let i = 0; i < element.style.length; i++) {
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const key = element.style.item(i);
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const value = element.style.getPropertyValue(key);
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const predicate = exceptions[key] ?? defaultPredicate;
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if (!predicate(key, value)) {
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toRemove.push(key);
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}
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}
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for (const key of toRemove) {
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element.style.removeProperty(key);
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}
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};
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}
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const nightModeExceptions = {
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"font-weight": keep,
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"font-style": keep,
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"text-decoration-line": keep,
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};
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export const filterStylingNightMode = filterStyling(discard, nightModeExceptions);
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export const filterStylingLightMode = filterStyling(discard, {
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color: keep,
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"background-color": (_key: string, value: string) => value != "transparent",
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...nightModeExceptions,
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});
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export const filterStylingInternal = filterStyling(keep, {
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"font-size": discard,
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"font-family": discard,
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width: discard,
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height: discard,
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"max-width": discard,
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"max-height": discard,
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});
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