adaptive-expressions
Version:
Common Expression Language
77 lines • 3.01 kB
JavaScript
;
/**
* @module adaptive-expressions
*/
/**
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.SubArray = void 0;
const expressionEvaluator_1 = require("../expressionEvaluator");
const expressionType_1 = require("../expressionType");
const functionUtils_1 = require("../functionUtils");
const returnType_1 = require("../returnType");
/**
* Returns a subarray from specified start and end positions. Index values start with the number 0.
*/
class SubArray extends expressionEvaluator_1.ExpressionEvaluator {
/**
* Initializes a new instance of the [SubArray](xref:adaptive-expressions.SubArray) class.
*/
constructor() {
super(expressionType_1.ExpressionType.SubArray, SubArray.evaluator, returnType_1.ReturnType.Array, SubArray.validator);
}
/**
* @private
*/
static evaluator(expression, state, options) {
let result;
const { value: arr, error: childrenError } = expression.children[0].tryEvaluate(state, options);
let error = childrenError;
if (!error) {
if (Array.isArray(arr)) {
let start;
const startExpr = expression.children[1];
({ value: start, error } = startExpr.tryEvaluate(state, options));
if (!error && !Number.isInteger(start)) {
error = `${startExpr} is not an integer.`;
}
else if (start < 0 || start > arr.length) {
error = `${startExpr}=${start} which is out of range for ${arr}`;
}
if (!error) {
let end;
if (expression.children.length === 2) {
end = arr.length;
}
else {
const endExpr = expression.children[2];
({ value: end, error } = endExpr.tryEvaluate(state, options));
if (!error && !Number.isInteger(end)) {
error = `${endExpr} is not an integer`;
}
else if (end < 0 || end > arr.length) {
error = `${endExpr}=${end} which is out of range for ${arr}`;
}
}
if (!error) {
result = arr.slice(start, end);
}
}
}
else {
error = `${expression.children[0]} is not array.`;
}
}
return { value: result, error };
}
/**
* @private
*/
static validator(expression) {
functionUtils_1.FunctionUtils.validateOrder(expression, [returnType_1.ReturnType.Number], returnType_1.ReturnType.Array, returnType_1.ReturnType.Number);
}
}
exports.SubArray = SubArray;
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