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import { observeDOM } from "@/shared/observe-dom";
type DOMReplacements = {
innerHTML?: string;
[key: string]: string | undefined | null;
};
type DOMModificaitonRule = readonly [string, DOMReplacements];
type DOMModificationRules = (DOMModificaitonRule | null)[];
let domModificationRules: DOMModificationRules = [];
let domModificationFinishedCount = 0;
/**
* Runs whenever the DOM mutates. Iterates over pending modification
* rules; when the selector matches, the element's innerHTML and
* attributes are updated and the rule is marked as complete.
*/
observeDOM(() => {
for (let i = 0; i < domModificationRules.length; i++) {
if (domModificationRules[i]) {
const element = document.querySelector(domModificationRules[i]![0]) as HTMLElement | null;
if (element) {
const attributes = domModificationRules[i]![1];
if (attributes.innerHTML) {
element.innerHTML = attributes.innerHTML as string;
}
delete attributes.innerHTML;
for (const attribute in attributes) {
if (attributes[attribute] === null) {
element.removeAttribute(attribute);
} else {
element.setAttribute(attribute, attributes[attribute] as string);
}
}
domModificationRules[i] = null;
domModificationFinishedCount++;
if (domModificationFinishedCount >= domModificationRules.length) {
return true;
}
}
}
}
return false;
});
/**
* Registers one or more DOM modification rules. Each rule is a tuple of
* `[selector, attributeMap]`. When an element matching the selector is
* found, its `innerHTML` is replaced (if `attributeMap.innerHTML` is set)
* and all other entries in the map are applied as `setAttribute` calls
* (or `removeAttribute` when the value is `null`).
*
* @param modificationRules - Array of `[selector, attributes]` rules.
*/
export function modifyDOM(modificationRules: DOMModificationRules) {
domModificationRules = domModificationRules.concat(modificationRules);
};
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