| 1 | /**
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| 2 | * @license
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| 3 | * Copyright Google LLC All Rights Reserved.
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| 4 | *
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| 5 | * Use of this source code is governed by an MIT-style license that can be
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| 6 | * found in the LICENSE file at https://angular.io/license
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| 7 | */
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| 8 | (function (factory) {
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| 9 | if (typeof module === "object" && typeof module.exports === "object") {
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| 10 | var v = factory(require, exports);
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| 11 | if (v !== undefined) module.exports = v;
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| 12 | }
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| 13 | else if (typeof define === "function" && define.amd) {
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| 14 | define("@angular/compiler/src/i18n/big_integer", ["require", "exports"], factory);
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| 15 | }
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| 16 | })(function (require, exports) {
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| 17 | "use strict";
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| 18 | Object.defineProperty(exports, "__esModule", { value: true });
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| 19 | exports.BigIntExponentiation = exports.BigIntForMultiplication = exports.BigInteger = void 0;
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| 20 | /**
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| 21 | * Represents a big integer using a buffer of its individual digits, with the least significant
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| 22 | * digit stored at the beginning of the array (little endian).
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| 23 | *
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| 24 | * For performance reasons, each instance is mutable. The addition operation can be done in-place
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| 25 | * to reduce memory pressure of allocation for the digits array.
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| 26 | */
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| 27 | var BigInteger = /** @class */ (function () {
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| 28 | /**
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| 29 | * Creates a big integer using its individual digits in little endian storage.
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| 30 | */
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| 31 | function BigInteger(digits) {
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| 32 | this.digits = digits;
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| 33 | }
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| 34 | BigInteger.zero = function () {
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| 35 | return new BigInteger([0]);
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| 36 | };
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| 37 | BigInteger.one = function () {
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| 38 | return new BigInteger([1]);
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| 39 | };
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| 40 | /**
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| 41 | * Creates a clone of this instance.
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| 42 | */
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| 43 | BigInteger.prototype.clone = function () {
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| 44 | return new BigInteger(this.digits.slice());
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| 45 | };
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| 46 | /**
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| 47 | * Returns a new big integer with the sum of `this` and `other` as its value. This does not mutate
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| 48 | * `this` but instead returns a new instance, unlike `addToSelf`.
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| 49 | */
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| 50 | BigInteger.prototype.add = function (other) {
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| 51 | var result = this.clone();
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| 52 | result.addToSelf(other);
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| 53 | return result;
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| 54 | };
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| 55 | /**
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| 56 | * Adds `other` to the instance itself, thereby mutating its value.
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| 57 | */
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| 58 | BigInteger.prototype.addToSelf = function (other) {
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| 59 | var maxNrOfDigits = Math.max(this.digits.length, other.digits.length);
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| 60 | var carry = 0;
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| 61 | for (var i = 0; i < maxNrOfDigits; i++) {
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| 62 | var digitSum = carry;
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| 63 | if (i < this.digits.length) {
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| 64 | digitSum += this.digits[i];
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| 65 | }
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| 66 | if (i < other.digits.length) {
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| 67 | digitSum += other.digits[i];
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| 68 | }
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| 69 | if (digitSum >= 10) {
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| 70 | this.digits[i] = digitSum - 10;
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| 71 | carry = 1;
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| 72 | }
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| 73 | else {
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| 74 | this.digits[i] = digitSum;
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| 75 | carry = 0;
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| 76 | }
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| 77 | }
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| 78 | // Apply a remaining carry if needed.
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| 79 | if (carry > 0) {
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| 80 | this.digits[maxNrOfDigits] = 1;
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| 81 | }
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| 82 | };
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| 83 | /**
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| 84 | * Builds the decimal string representation of the big integer. As this is stored in
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| 85 | * little endian, the digits are concatenated in reverse order.
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| 86 | */
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| 87 | BigInteger.prototype.toString = function () {
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| 88 | var res = '';
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| 89 | for (var i = this.digits.length - 1; i >= 0; i--) {
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| 90 | res += this.digits[i];
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| 91 | }
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| 92 | return res;
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| 93 | };
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| 94 | return BigInteger;
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| 95 | }());
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| 96 | exports.BigInteger = BigInteger;
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| 97 | /**
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| 98 | * Represents a big integer which is optimized for multiplication operations, as its power-of-twos
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| 99 | * are memoized. See `multiplyBy()` for details on the multiplication algorithm.
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| 100 | */
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| 101 | var BigIntForMultiplication = /** @class */ (function () {
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| 102 | function BigIntForMultiplication(value) {
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| 103 | this.powerOfTwos = [value];
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| 104 | }
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| 105 | /**
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| 106 | * Returns the big integer itself.
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| 107 | */
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| 108 | BigIntForMultiplication.prototype.getValue = function () {
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| 109 | return this.powerOfTwos[0];
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| 110 | };
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| 111 | /**
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| 112 | * Computes the value for `num * b`, where `num` is a JS number and `b` is a big integer. The
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| 113 | * value for `b` is represented by a storage model that is optimized for this computation.
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| 114 | *
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| 115 | * This operation is implemented in N(log2(num)) by continuous halving of the number, where the
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| 116 | * least-significant bit (LSB) is tested in each iteration. If the bit is set, the bit's index is
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| 117 | * used as exponent into the power-of-two multiplication of `b`.
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| 118 | *
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| 119 | * As an example, consider the multiplication num=42, b=1337. In binary 42 is 0b00101010 and the
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| 120 | * algorithm unrolls into the following iterations:
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| 121 | *
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| 122 | * Iteration | num | LSB | b * 2^iter | Add? | product
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| 123 | * -----------|------------|------|------------|------|--------
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| 124 | * 0 | 0b00101010 | 0 | 1337 | No | 0
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| 125 | * 1 | 0b00010101 | 1 | 2674 | Yes | 2674
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| 126 | * 2 | 0b00001010 | 0 | 5348 | No | 2674
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| 127 | * 3 | 0b00000101 | 1 | 10696 | Yes | 13370
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| 128 | * 4 | 0b00000010 | 0 | 21392 | No | 13370
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| 129 | * 5 | 0b00000001 | 1 | 42784 | Yes | 56154
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| 130 | * 6 | 0b00000000 | 0 | 85568 | No | 56154
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| 131 | *
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| 132 | * The computed product of 56154 is indeed the correct result.
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| 133 | *
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| 134 | * The `BigIntForMultiplication` representation for a big integer provides memoized access to the
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| 135 | * power-of-two values to reduce the workload in computing those values.
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| 136 | */
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| 137 | BigIntForMultiplication.prototype.multiplyBy = function (num) {
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| 138 | var product = BigInteger.zero();
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| 139 | this.multiplyByAndAddTo(num, product);
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| 140 | return product;
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| 141 | };
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| 142 | /**
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| 143 | * See `multiplyBy()` for details. This function allows for the computed product to be added
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| 144 | * directly to the provided result big integer.
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| 145 | */
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| 146 | BigIntForMultiplication.prototype.multiplyByAndAddTo = function (num, result) {
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| 147 | for (var exponent = 0; num !== 0; num = num >>> 1, exponent++) {
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| 148 | if (num & 1) {
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| 149 | var value = this.getMultipliedByPowerOfTwo(exponent);
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| 150 | result.addToSelf(value);
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| 151 | }
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| 152 | }
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| 153 | };
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| 154 | /**
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| 155 | * Computes and memoizes the big integer value for `this.number * 2^exponent`.
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| 156 | */
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| 157 | BigIntForMultiplication.prototype.getMultipliedByPowerOfTwo = function (exponent) {
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| 158 | // Compute the powers up until the requested exponent, where each value is computed from its
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| 159 | // predecessor. This is simple as `this.number * 2^(exponent - 1)` only has to be doubled (i.e.
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| 160 | // added to itself) to reach `this.number * 2^exponent`.
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| 161 | for (var i = this.powerOfTwos.length; i <= exponent; i++) {
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| 162 | var previousPower = this.powerOfTwos[i - 1];
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| 163 | this.powerOfTwos[i] = previousPower.add(previousPower);
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| 164 | }
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| 165 | return this.powerOfTwos[exponent];
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| 166 | };
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| 167 | return BigIntForMultiplication;
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| 168 | }());
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| 169 | exports.BigIntForMultiplication = BigIntForMultiplication;
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| 170 | /**
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| 171 | * Represents an exponentiation operation for the provided base, of which exponents are computed and
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| 172 | * memoized. The results are represented by a `BigIntForMultiplication` which is tailored for
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| 173 | * multiplication operations by memoizing the power-of-twos. This effectively results in a matrix
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| 174 | * representation that is lazily computed upon request.
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| 175 | */
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| 176 | var BigIntExponentiation = /** @class */ (function () {
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| 177 | function BigIntExponentiation(base) {
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| 178 | this.base = base;
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| 179 | this.exponents = [new BigIntForMultiplication(BigInteger.one())];
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| 180 | }
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| 181 | /**
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| 182 | * Compute the value for `this.base^exponent`, resulting in a big integer that is optimized for
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| 183 | * further multiplication operations.
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| 184 | */
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| 185 | BigIntExponentiation.prototype.toThePowerOf = function (exponent) {
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| 186 | // Compute the results up until the requested exponent, where every value is computed from its
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| 187 | // predecessor. This is because `this.base^(exponent - 1)` only has to be multiplied by `base`
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| 188 | // to reach `this.base^exponent`.
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| 189 | for (var i = this.exponents.length; i <= exponent; i++) {
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| 190 | var value = this.exponents[i - 1].multiplyBy(this.base);
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| 191 | this.exponents[i] = new BigIntForMultiplication(value);
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| 192 | }
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| 193 | return this.exponents[exponent];
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| 194 | };
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| 195 | return BigIntExponentiation;
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| 196 | }());
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| 197 | exports.BigIntExponentiation = BigIntExponentiation;
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| 198 | });
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The addition operation can be done in-place\n * to reduce memory pressure of allocation for the digits array.\n */\nexport class BigInteger {\n  static zero(): BigInteger {\n    return new BigInteger([0]);\n  }\n\n  static one(): BigInteger {\n    return new BigInteger([1]);\n  }\n\n  /**\n   * Creates a big integer using its individual digits in little endian storage.\n   */\n  private constructor(private readonly digits: number[]) {}\n\n  /**\n   * Creates a clone of this instance.\n   */\n  clone(): BigInteger {\n    return new BigInteger(this.digits.slice());\n  }\n\n  /**\n   * Returns a new big integer with the sum of `this` and `other` as its value. This does not mutate\n   * `this` but instead returns a new instance, unlike `addToSelf`.\n   */\n  add(other: BigInteger): BigInteger {\n    const result = this.clone();\n    result.addToSelf(other);\n    return result;\n  }\n\n  /**\n   * Adds `other` to the instance itself, thereby mutating its value.\n   */\n  addToSelf(other: BigInteger): void {\n    const maxNrOfDigits = Math.max(this.digits.length, other.digits.length);\n    let carry = 0;\n    for (let i = 0; i < maxNrOfDigits; i++) {\n      let digitSum = carry;\n      if (i < this.digits.length) {\n        digitSum += this.digits[i];\n      }\n      if (i < other.digits.length) {\n        digitSum += other.digits[i];\n      }\n\n      if (digitSum >= 10) {\n        this.digits[i] = digitSum - 10;\n        carry = 1;\n      } else {\n        this.digits[i] = digitSum;\n        carry = 0;\n      }\n    }\n\n    // Apply a remaining carry if needed.\n    if (carry > 0) {\n      this.digits[maxNrOfDigits] = 1;\n    }\n  }\n\n  /**\n   * Builds the decimal string representation of the big integer. As this is stored in\n   * little endian, the digits are concatenated in reverse order.\n   */\n  toString(): string {\n    let res = '';\n    for (let i = this.digits.length - 1; i >= 0; i--) {\n      res += this.digits[i];\n    }\n    return res;\n  }\n}\n\n/**\n * Represents a big integer which is optimized for multiplication operations, as its power-of-twos\n * are memoized. See `multiplyBy()` for details on the multiplication algorithm.\n */\nexport class BigIntForMultiplication {\n  /**\n   * Stores all memoized power-of-twos, where each index represents `this.number * 2^index`.\n   */\n  private readonly powerOfTwos: BigInteger[];\n\n  constructor(value: BigInteger) {\n    this.powerOfTwos = [value];\n  }\n\n  /**\n   * Returns the big integer itself.\n   */\n  getValue(): BigInteger {\n    return this.powerOfTwos[0];\n  }\n\n  /**\n   * Computes the value for `num * b`, where `num` is a JS number and `b` is a big integer. The\n   * value for `b` is represented by a storage model that is optimized for this computation.\n   *\n   * This operation is implemented in N(log2(num)) by continuous halving of the number, where the\n   * least-significant bit (LSB) is tested in each iteration. If the bit is set, the bit's index is\n   * used as exponent into the power-of-two multiplication of `b`.\n   *\n   * As an example, consider the multiplication num=42, b=1337. In binary 42 is 0b00101010 and the\n   * algorithm unrolls into the following iterations:\n   *\n   *  Iteration | num        | LSB  | b * 2^iter | Add? | product\n   * -----------|------------|------|------------|------|--------\n   *  0         | 0b00101010 | 0    | 1337       | No   | 0\n   *  1         | 0b00010101 | 1    | 2674       | Yes  | 2674\n   *  2         | 0b00001010 | 0    | 5348       | No   | 2674\n   *  3         | 0b00000101 | 1    | 10696      | Yes  | 13370\n   *  4         | 0b00000010 | 0    | 21392      | No   | 13370\n   *  5         | 0b00000001 | 1    | 42784      | Yes  | 56154\n   *  6         | 0b00000000 | 0    | 85568      | No   | 56154\n   *\n   * The computed product of 56154 is indeed the correct result.\n   *\n   * The `BigIntForMultiplication` representation for a big integer provides memoized access to the\n   * power-of-two values to reduce the workload in computing those values.\n   */\n  multiplyBy(num: number): BigInteger {\n    const product = BigInteger.zero();\n    this.multiplyByAndAddTo(num, product);\n    return product;\n  }\n\n  /**\n   * See `multiplyBy()` for details. This function allows for the computed product to be added\n   * directly to the provided result big integer.\n   */\n  multiplyByAndAddTo(num: number, result: BigInteger): void {\n    for (let exponent = 0; num !== 0; num = num >>> 1, exponent++) {\n      if (num & 1) {\n        const value = this.getMultipliedByPowerOfTwo(exponent);\n        result.addToSelf(value);\n      }\n    }\n  }\n\n  /**\n   * Computes and memoizes the big integer value for `this.number * 2^exponent`.\n   */\n  private getMultipliedByPowerOfTwo(exponent: number): BigInteger {\n    // Compute the powers up until the requested exponent, where each value is computed from its\n    // predecessor. This is simple as `this.number * 2^(exponent - 1)` only has to be doubled (i.e.\n    // added to itself) to reach `this.number * 2^exponent`.\n    for (let i = this.powerOfTwos.length; i <= exponent; i++) {\n      const previousPower = this.powerOfTwos[i - 1];\n      this.powerOfTwos[i] = previousPower.add(previousPower);\n    }\n    return this.powerOfTwos[exponent];\n  }\n}\n\n/**\n * Represents an exponentiation operation for the provided base, of which exponents are computed and\n * memoized. The results are represented by a `BigIntForMultiplication` which is tailored for\n * multiplication operations by memoizing the power-of-twos. This effectively results in a matrix\n * representation that is lazily computed upon request.\n */\nexport class BigIntExponentiation {\n  private readonly exponents = [new BigIntForMultiplication(BigInteger.one())];\n\n  constructor(private readonly base: number) {}\n\n  /**\n   * Compute the value for `this.base^exponent`, resulting in a big integer that is optimized for\n   * further multiplication operations.\n   */\n  toThePowerOf(exponent: number): BigIntForMultiplication {\n    // Compute the results up until the requested exponent, where every value is computed from its\n    // predecessor. This is because `this.base^(exponent - 1)` only has to be multiplied by `base`\n    // to reach `this.base^exponent`.\n    for (let i = this.exponents.length; i <= exponent; i++) {\n      const value = this.exponents[i - 1].multiplyBy(this.base);\n      this.exponents[i] = new BigIntForMultiplication(value);\n    }\n    return this.exponents[exponent];\n  }\n}\n"]} |
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