botbuilder-dialogs-adaptive
Version:
Rule system for the Microsoft BotBuilder dialog system.
58 lines • 2.02 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.RandomSelector = void 0;
/**
* @module botbuilder-dialogs-adaptive
*/
/**
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License.
*/
const adaptive_expressions_1 = require("adaptive-expressions");
const triggerSelector_1 = require("../triggerSelector");
/**
* Select a random true rule implementation of TriggerSelector.
*/
class RandomSelector extends triggerSelector_1.TriggerSelector {
/**
* Initialize the selector with the set of rules.
*
* @param conditionals Possible rules to match.
* @param evaluate A boolean representing if rules should be evaluated on select.
*/
initialize(conditionals, evaluate) {
this._conditionals = conditionals;
this._evaluate = evaluate;
}
/**
* Select the best rule to execute.
*
* @param actionContext Dialog context for evaluation.
* @returns A Promise with a number array.
*/
select(actionContext) {
const candidates = [];
for (let i = 0; i < this._conditionals.length; i++) {
const conditional = this._conditionals[i];
if (this._evaluate) {
const expression = conditional.getExpression();
const { value, error } = expression.tryEvaluate(actionContext.state);
if (value && !error) {
candidates.push(conditional);
}
}
else {
candidates.push(conditional);
}
}
const result = [];
if (candidates.length > 0) {
const selection = adaptive_expressions_1.Extensions.randomNext(actionContext.state, 0, candidates.length);
result.push(candidates[selection]);
}
return Promise.resolve(result);
}
}
exports.RandomSelector = RandomSelector;
RandomSelector.$kind = 'Microsoft.RandomSelector';
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