adaptive-expressions
Version:
Common Expression Language
58 lines • 2.31 kB
JavaScript
;
/**
* @module adaptive-expressions
*/
/**
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.Element = 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 options_1 = require("../options");
const returnType_1 = require("../returnType");
/**
* The indexing operator ([ ]) selects a single element from a sequence.
* Support number index for list or string index for object.
*/
class Element extends expressionEvaluator_1.ExpressionEvaluator {
/**
* Initializes a new instance of the [Element](xref:adaptive-expressions.Element) class.
*/
constructor() {
super(expressionType_1.ExpressionType.Element, Element.evaluator, returnType_1.ReturnType.Object, functionUtils_1.FunctionUtils.validateBinary);
}
/**
* @private
*/
static evaluator(expression, state, options) {
let value;
const instance = expression.children[0];
const index = expression.children[1];
const { value: inst, error: evalError } = instance.tryEvaluate(state, options);
let error = evalError;
if (!error) {
let idxValue;
const newOptions = new options_1.Options(options);
newOptions.nullSubstitution = undefined;
({ value: idxValue, error } = index.tryEvaluate(state, newOptions));
if (!error) {
if (Number.isInteger(idxValue)) {
({ value, error } = functionUtils_internal_1.InternalFunctionUtils.accessIndex(inst, Number(idxValue)));
}
else if (typeof idxValue === 'string') {
({ value, error } = functionUtils_internal_1.InternalFunctionUtils.accessProperty(inst, idxValue.toString()));
}
else {
error = `Could not coerce ${index} to an int or string.`;
}
return { value, error };
}
}
}
}
exports.Element = Element;
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