/
searchproviderregistry.ts
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/
searchproviderregistry.ts
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// Copyright (c) Jupyter Development Team.
// Distributed under the terms of the Modified BSD License.
import { ISearchProvider, ISearchProviderConstructor } from './interfaces';
import { Token } from '@phosphor/coreutils';
import { Widget } from '@phosphor/widgets';
import { IDisposable, DisposableDelegate } from '@phosphor/disposable';
import { ISignal, Signal } from '@phosphor/signaling';
/* tslint:disable */
/**
* The search provider registry token.
*/
export const ISearchProviderRegistry = new Token<ISearchProviderRegistry>(
'@jupyterlab/documentsearch:ISearchProviderRegistry'
);
/* tslint:enable */
export interface ISearchProviderRegistry {
/**
* Add a provider to the registry.
*
* @param key - The provider key.
* @returns A disposable delegate that, when disposed, deregisters the given search provider
*/
register(key: string, provider: ISearchProviderConstructor): IDisposable;
/**
* Returns a matching provider for the widget.
*
* @param widget - The widget to search over.
* @returns the search provider, or undefined if none exists.
*/
getProviderForWidget(widget: any): ISearchProvider | undefined;
/**
* Signal that emits when a new search provider has been registered
* or removed.
*/
changed: ISignal<ISearchProviderRegistry, void>;
}
export class SearchProviderRegistry implements ISearchProviderRegistry {
/**
* Add a provider to the registry.
*
* @param key - The provider key.
* @returns A disposable delegate that, when disposed, deregisters the given search provider
*/
register(key: string, provider: ISearchProviderConstructor): IDisposable {
this._providerMap.set(key, provider);
this._changed.emit();
return new DisposableDelegate(() => {
this._providerMap.delete(key);
this._changed.emit();
});
}
/**
* Returns a matching provider for the widget.
*
* @param widget - The widget to search over.
* @returns the search provider, or undefined if none exists.
*/
getProviderForWidget(widget: Widget): ISearchProvider | undefined {
return this._findMatchingProvider(this._providerMap, widget);
}
/**
* Signal that emits when a new search provider has been registered
* or removed.
*/
get changed(): ISignal<this, void> {
return this._changed;
}
private _findMatchingProvider(
providerMap: Private.ProviderMap,
widget: Widget
): ISearchProvider | undefined {
// iterate through all providers and ask each one if it can search on the
// widget.
for (let P of providerMap.values()) {
if (P.canSearchOn(widget)) {
return new P();
}
}
return undefined;
}
private _changed = new Signal<this, void>(this);
private _providerMap: Private.ProviderMap = new Map<
string,
ISearchProviderConstructor
>();
}
namespace Private {
export type ProviderMap = Map<string, ISearchProviderConstructor>;
}