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import type { Page } from "../core.ts";
/** * Define independent updates scopes * This optimize the update process after any change */export default class Scopes {  scopes = new Set<ScopeFilter>();
  /** Returns a function to filter the pages that must be rebuild */  getFilter(changedFiles: Iterable<string>): (page: Page) => boolean {    // There's no any scope, so rebuild all pages    if (this.scopes.size === 0) {      return () => true;    }
    let noScoped = false;    const changed = new Set<ScopeFilter>();
    for (const file of changedFiles) {      let found = false;      for (const scopeFn of this.scopes) {        if (scopeFn(file)) {          changed.add(scopeFn);          found = true;          break;        }      }
      if (!found) {        noScoped = true;      }    }
    // Calculate scoped extensions that didn't change    const notChanged: ScopeFilter[] = [];
    for (const scopeFn of this.scopes) {      if (!changed.has(scopeFn)) {        notChanged.push(scopeFn);      }    }
    // Generate the filter function    return function (page) {      const path = page.src.path + page.src.ext;
      // It matches with any scope that has changed      for (const scopeFn of changed) {        if (scopeFn(path)) {          return true;        }      }
      // It's not scoped      return noScoped && notChanged.every((scopeFn) => !scopeFn(path));    };  }}
export type ScopeFilter = (path: string) => boolean;