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isolate.ts
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isolate.ts
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import invariant from 'invariant';
import isFunction from 'isFunction';
import * as nestedArray from 'nestedArray';
import { createIsolateCursor, IsolateCursor } from './isolateCursor';
import { Isolate, IsolateTypes } from 'IsolateTypes';
import VestTest from 'VestTest';
import ctx from 'ctx';
import { usePrevKeys } from 'key';
import { useSetTests } from 'stateHooks';
export function isolate(
{ type = IsolateTypes.DEFAULT }: { type?: IsolateTypes },
callback: () => VestTest[] | void
): VestTest[] | void {
invariant(isFunction(callback));
// Generate a new Isolate layer, with its own cursor
const isolate = generateIsolate(type, useCurrentPath());
const output = ctx.run({ isolate }, () => {
isolate.keys.prev = usePrevKeys();
useSetTests(tests => nestedArray.setValueAtPath(tests, isolate.path, []));
const res = callback();
return res;
});
// Move the parent cursor forward once we're done
useCursor().next();
return output;
}
/**
* @returns {Isolate} The current isolate layer
*/
export function useIsolate(): Isolate {
return ctx.useX().isolate;
}
/**
* @returns {boolean} Whether or not the current isolate allows tests to be reordered
*/
export function shouldAllowReorder(): boolean {
return useIsolate().type === IsolateTypes.EACH;
}
/**
* @returns {number[]} The current cursor path of the isolate tree
*/
export function useCurrentPath(): number[] {
const isolate = useIsolate();
return isolate.path.concat(isolate.cursor.current());
}
/**
* @returns {IsolateCursor} The cursor object for the current isolate
*/
export function useCursor(): IsolateCursor {
return useIsolate().cursor;
}
export function generateIsolate(
type: IsolateTypes,
path: number[] = []
): Isolate {
return {
cursor: createIsolateCursor(),
keys: {
current: {},
prev: {},
},
path,
type,
};
}