adaptive-expressions/lib/builtinFunctions/isPresent.js

Common Expression Language

"use strict";
/**
 * @module adaptive-expressions
 */
/**
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.IsPresent = void 0;
const expressionEvaluator_1 = require("../expressionEvaluator");
const expressionType_1 = require("../expressionType");
const functionUtils_1 = require("../functionUtils");
const functionUtils_internal_1 = require("../functionUtils.internal");
const returnType_1 = require("../returnType");
/**
 * Return true if a given TimexProperty or Timex expression refers to the present.
 */
class IsPresent extends expressionEvaluator_1.ExpressionEvaluator {
    /**
     * Initializes a new instance of the [IsPresent](xref:adaptive-expressions.IsPresent) class.
     */
    constructor() {
        super(expressionType_1.ExpressionType.IsPresent, IsPresent.evaluator, returnType_1.ReturnType.Boolean, functionUtils_1.FunctionUtils.validateUnary);
    }
    /**
     * @private
     */
    static evaluator(expr, state, options) {
        let parsed;
        let value = false;
        const { args, error: childrenError } = functionUtils_1.FunctionUtils.evaluateChildren(expr, state, options);
        let error = childrenError;
        if (!error) {
            ({ timexProperty: parsed, error: error } = functionUtils_internal_1.InternalFunctionUtils.parseTimexProperty(args[0]));
        }
        if (parsed && !error) {
            value = parsed.now !== undefined;
        }
        return { value, error };
    }
}
exports.IsPresent = IsPresent;
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