source: frontend/node_modules/es-abstract/2016/CharacterRange.js

'use strict';

var GetIntrinsic = require('get-intrinsic');
var callBound = require('call-bound');

var $fromCharCode = GetIntrinsic('%String.fromCharCode%');
var $TypeError = require('es-errors/type');
var $charCodeAt = callBound('String.prototype.charCodeAt');

var CharSet = require('../helpers/CharSet').CharSet;

module.exports = function CharacterRange(A, B) {
        var a;
        var b;

        if (A instanceof CharSet || B instanceof CharSet) {
                if (!(A instanceof CharSet) || !(B instanceof CharSet)) {
                        throw new $TypeError('Assertion failed: CharSets A and B are not both CharSets');
                }

                A.yield(function (c) {
                        if (typeof a !== 'undefined') {
                                throw new $TypeError('Assertion failed: CharSet A has more than one character');
                        }
                        a = c;
                });
                B.yield(function (c) {
                        if (typeof b !== 'undefined') {
                                throw new $TypeError('Assertion failed: CharSet B has more than one character');
                        }
                        b = c;
                });
        } else {
                if (A.length !== 1 || B.length !== 1) {
                        throw new $TypeError('Assertion failed: CharSets A and B contain exactly one character');
                }
                a = A[0];
                b = B[0];
        }

        var i = $charCodeAt(a, 0);
        var j = $charCodeAt(b, 0);

        if (!(i <= j)) {
                throw new $TypeError('Assertion failed: i is not <= j');
        }

        var arr = [];
        for (var k = i; k <= j; k += 1) {
                arr[arr.length] = $fromCharCode(k);
        }
        return arr;
};