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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { z } from 'zod';
/**
* The reserved server name for the IDE's MCP server.
*/
export const IDE_SERVER_NAME = '_ide_server';
/**
* Zod schema for validating a cursor position.
*/
export const CursorSchema = z.object({
line: z.number(),
character: z.number(),
});
export type Cursor = z.infer<typeof CursorSchema>;
/**
* Zod schema for validating an active file context from the IDE.
*/
export const ActiveFileSchema = z.object({
filePath: z.string(),
cursor: CursorSchema.optional(),
});
export type ActiveFile = z.infer<typeof ActiveFileSchema>;
/**
* Zod schema for validating the 'ide/activeFileChanged' notification from the IDE.
*/
export const ActiveFileNotificationSchema = z.object({
method: z.literal('ide/activeFileChanged'),
params: ActiveFileSchema,
});
type ActiveFileSubscriber = (activeFile: ActiveFile | undefined) => void;
/**
* Creates a new store for managing the IDE's active file context.
* This factory function encapsulates the state and logic, allowing for the creation
* of isolated instances, which is particularly useful for testing.
*
* @returns An object with methods to interact with the active file context.
*/
export function createIdeContextStore() {
let activeFileContext: ActiveFile | undefined = undefined;
const subscribers = new Set<ActiveFileSubscriber>();
/**
* Notifies all registered subscribers about the current active file context.
*/
function notifySubscribers(): void {
for (const subscriber of subscribers) {
subscriber(activeFileContext);
}
}
/**
* Sets the active file context and notifies all registered subscribers of the change.
* @param newActiveFile The new active file context from the IDE.
*/
function setActiveFileContext(newActiveFile: ActiveFile): void {
activeFileContext = newActiveFile;
notifySubscribers();
}
/**
* Clears the active file context and notifies all registered subscribers of the change.
*/
function clearActiveFileContext(): void {
activeFileContext = undefined;
notifySubscribers();
}
/**
* Retrieves the current active file context.
* @returns The `ActiveFile` object if a file is active, otherwise `undefined`.
*/
function getActiveFileContext(): ActiveFile | undefined {
return activeFileContext;
}
/**
* Subscribes to changes in the active file context.
*
* When the active file context changes, the provided `subscriber` function will be called.
* Note: The subscriber is not called with the current value upon subscription.
*
* @param subscriber The function to be called when the active file context changes.
* @returns A function that, when called, will unsubscribe the provided subscriber.
*/
function subscribeToActiveFile(subscriber: ActiveFileSubscriber): () => void {
subscribers.add(subscriber);
return () => {
subscribers.delete(subscriber);
};
}
return {
setActiveFileContext,
getActiveFileContext,
subscribeToActiveFile,
clearActiveFileContext,
};
}
/**
* The default, shared instance of the IDE context store for the application.
*/
export const ideContext = createIdeContextStore();
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