668 lines
28 KiB
JavaScript
668 lines
28 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.Decimal128 = void 0;
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var buffer_1 = require("buffer");
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var error_1 = require("./error");
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var long_1 = require("./long");
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var utils_1 = require("./parser/utils");
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var PARSE_STRING_REGEXP = /^(\+|-)?(\d+|(\d*\.\d*))?(E|e)?([-+])?(\d+)?$/;
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var PARSE_INF_REGEXP = /^(\+|-)?(Infinity|inf)$/i;
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var PARSE_NAN_REGEXP = /^(\+|-)?NaN$/i;
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var EXPONENT_MAX = 6111;
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var EXPONENT_MIN = -6176;
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var EXPONENT_BIAS = 6176;
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var MAX_DIGITS = 34;
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// Nan value bits as 32 bit values (due to lack of longs)
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var NAN_BUFFER = [
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0x7c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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].reverse();
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// Infinity value bits 32 bit values (due to lack of longs)
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var INF_NEGATIVE_BUFFER = [
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0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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].reverse();
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var INF_POSITIVE_BUFFER = [
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0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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].reverse();
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var EXPONENT_REGEX = /^([-+])?(\d+)?$/;
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// Extract least significant 5 bits
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var COMBINATION_MASK = 0x1f;
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// Extract least significant 14 bits
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var EXPONENT_MASK = 0x3fff;
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// Value of combination field for Inf
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var COMBINATION_INFINITY = 30;
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// Value of combination field for NaN
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var COMBINATION_NAN = 31;
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// Detect if the value is a digit
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function isDigit(value) {
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return !isNaN(parseInt(value, 10));
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}
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// Divide two uint128 values
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function divideu128(value) {
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var DIVISOR = long_1.Long.fromNumber(1000 * 1000 * 1000);
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var _rem = long_1.Long.fromNumber(0);
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if (!value.parts[0] && !value.parts[1] && !value.parts[2] && !value.parts[3]) {
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return { quotient: value, rem: _rem };
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}
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for (var i = 0; i <= 3; i++) {
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// Adjust remainder to match value of next dividend
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_rem = _rem.shiftLeft(32);
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// Add the divided to _rem
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_rem = _rem.add(new long_1.Long(value.parts[i], 0));
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value.parts[i] = _rem.div(DIVISOR).low;
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_rem = _rem.modulo(DIVISOR);
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}
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return { quotient: value, rem: _rem };
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}
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// Multiply two Long values and return the 128 bit value
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function multiply64x2(left, right) {
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if (!left && !right) {
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return { high: long_1.Long.fromNumber(0), low: long_1.Long.fromNumber(0) };
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}
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var leftHigh = left.shiftRightUnsigned(32);
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var leftLow = new long_1.Long(left.getLowBits(), 0);
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var rightHigh = right.shiftRightUnsigned(32);
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var rightLow = new long_1.Long(right.getLowBits(), 0);
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var productHigh = leftHigh.multiply(rightHigh);
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var productMid = leftHigh.multiply(rightLow);
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var productMid2 = leftLow.multiply(rightHigh);
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var productLow = leftLow.multiply(rightLow);
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productHigh = productHigh.add(productMid.shiftRightUnsigned(32));
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productMid = new long_1.Long(productMid.getLowBits(), 0)
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.add(productMid2)
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.add(productLow.shiftRightUnsigned(32));
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productHigh = productHigh.add(productMid.shiftRightUnsigned(32));
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productLow = productMid.shiftLeft(32).add(new long_1.Long(productLow.getLowBits(), 0));
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// Return the 128 bit result
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return { high: productHigh, low: productLow };
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}
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function lessThan(left, right) {
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// Make values unsigned
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var uhleft = left.high >>> 0;
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var uhright = right.high >>> 0;
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// Compare high bits first
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if (uhleft < uhright) {
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return true;
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}
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else if (uhleft === uhright) {
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var ulleft = left.low >>> 0;
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var ulright = right.low >>> 0;
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if (ulleft < ulright)
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return true;
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}
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return false;
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}
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function invalidErr(string, message) {
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throw new error_1.BSONTypeError("\"" + string + "\" is not a valid Decimal128 string - " + message);
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}
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/**
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* A class representation of the BSON Decimal128 type.
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* @public
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*/
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var Decimal128 = /** @class */ (function () {
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/**
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* @param bytes - a buffer containing the raw Decimal128 bytes in little endian order,
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* or a string representation as returned by .toString()
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*/
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function Decimal128(bytes) {
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if (!(this instanceof Decimal128))
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return new Decimal128(bytes);
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if (typeof bytes === 'string') {
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this.bytes = Decimal128.fromString(bytes).bytes;
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}
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else if (utils_1.isUint8Array(bytes)) {
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if (bytes.byteLength !== 16) {
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throw new error_1.BSONTypeError('Decimal128 must take a Buffer of 16 bytes');
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}
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this.bytes = bytes;
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}
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else {
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throw new error_1.BSONTypeError('Decimal128 must take a Buffer or string');
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}
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}
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/**
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* Create a Decimal128 instance from a string representation
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*
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* @param representation - a numeric string representation.
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*/
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Decimal128.fromString = function (representation) {
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// Parse state tracking
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var isNegative = false;
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var sawRadix = false;
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var foundNonZero = false;
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// Total number of significant digits (no leading or trailing zero)
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var significantDigits = 0;
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// Total number of significand digits read
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var nDigitsRead = 0;
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// Total number of digits (no leading zeros)
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var nDigits = 0;
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// The number of the digits after radix
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var radixPosition = 0;
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// The index of the first non-zero in *str*
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var firstNonZero = 0;
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// Digits Array
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var digits = [0];
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// The number of digits in digits
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var nDigitsStored = 0;
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// Insertion pointer for digits
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var digitsInsert = 0;
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// The index of the first non-zero digit
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var firstDigit = 0;
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// The index of the last digit
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var lastDigit = 0;
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// Exponent
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var exponent = 0;
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// loop index over array
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var i = 0;
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// The high 17 digits of the significand
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var significandHigh = new long_1.Long(0, 0);
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// The low 17 digits of the significand
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var significandLow = new long_1.Long(0, 0);
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// The biased exponent
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var biasedExponent = 0;
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// Read index
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var index = 0;
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// Naively prevent against REDOS attacks.
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// TODO: implementing a custom parsing for this, or refactoring the regex would yield
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// further gains.
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if (representation.length >= 7000) {
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throw new error_1.BSONTypeError('' + representation + ' not a valid Decimal128 string');
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}
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// Results
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var stringMatch = representation.match(PARSE_STRING_REGEXP);
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var infMatch = representation.match(PARSE_INF_REGEXP);
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var nanMatch = representation.match(PARSE_NAN_REGEXP);
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// Validate the string
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if ((!stringMatch && !infMatch && !nanMatch) || representation.length === 0) {
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throw new error_1.BSONTypeError('' + representation + ' not a valid Decimal128 string');
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}
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if (stringMatch) {
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// full_match = stringMatch[0]
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// sign = stringMatch[1]
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var unsignedNumber = stringMatch[2];
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// stringMatch[3] is undefined if a whole number (ex "1", 12")
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// but defined if a number w/ decimal in it (ex "1.0, 12.2")
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var e = stringMatch[4];
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var expSign = stringMatch[5];
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var expNumber = stringMatch[6];
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// they provided e, but didn't give an exponent number. for ex "1e"
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if (e && expNumber === undefined)
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invalidErr(representation, 'missing exponent power');
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// they provided e, but didn't give a number before it. for ex "e1"
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if (e && unsignedNumber === undefined)
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invalidErr(representation, 'missing exponent base');
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if (e === undefined && (expSign || expNumber)) {
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invalidErr(representation, 'missing e before exponent');
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}
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}
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// Get the negative or positive sign
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if (representation[index] === '+' || representation[index] === '-') {
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isNegative = representation[index++] === '-';
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}
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// Check if user passed Infinity or NaN
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if (!isDigit(representation[index]) && representation[index] !== '.') {
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if (representation[index] === 'i' || representation[index] === 'I') {
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return new Decimal128(buffer_1.Buffer.from(isNegative ? INF_NEGATIVE_BUFFER : INF_POSITIVE_BUFFER));
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}
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else if (representation[index] === 'N') {
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return new Decimal128(buffer_1.Buffer.from(NAN_BUFFER));
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}
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}
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// Read all the digits
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while (isDigit(representation[index]) || representation[index] === '.') {
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if (representation[index] === '.') {
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if (sawRadix)
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invalidErr(representation, 'contains multiple periods');
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sawRadix = true;
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index = index + 1;
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continue;
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}
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if (nDigitsStored < 34) {
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if (representation[index] !== '0' || foundNonZero) {
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if (!foundNonZero) {
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firstNonZero = nDigitsRead;
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}
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foundNonZero = true;
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// Only store 34 digits
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digits[digitsInsert++] = parseInt(representation[index], 10);
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nDigitsStored = nDigitsStored + 1;
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}
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}
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if (foundNonZero)
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nDigits = nDigits + 1;
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if (sawRadix)
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radixPosition = radixPosition + 1;
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nDigitsRead = nDigitsRead + 1;
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index = index + 1;
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}
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if (sawRadix && !nDigitsRead)
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throw new error_1.BSONTypeError('' + representation + ' not a valid Decimal128 string');
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// Read exponent if exists
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if (representation[index] === 'e' || representation[index] === 'E') {
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// Read exponent digits
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var match = representation.substr(++index).match(EXPONENT_REGEX);
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// No digits read
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if (!match || !match[2])
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return new Decimal128(buffer_1.Buffer.from(NAN_BUFFER));
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// Get exponent
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exponent = parseInt(match[0], 10);
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// Adjust the index
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index = index + match[0].length;
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}
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// Return not a number
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if (representation[index])
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return new Decimal128(buffer_1.Buffer.from(NAN_BUFFER));
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// Done reading input
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// Find first non-zero digit in digits
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firstDigit = 0;
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if (!nDigitsStored) {
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firstDigit = 0;
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lastDigit = 0;
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digits[0] = 0;
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nDigits = 1;
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nDigitsStored = 1;
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significantDigits = 0;
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}
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else {
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lastDigit = nDigitsStored - 1;
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significantDigits = nDigits;
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if (significantDigits !== 1) {
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while (digits[firstNonZero + significantDigits - 1] === 0) {
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significantDigits = significantDigits - 1;
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}
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}
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}
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// Normalization of exponent
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// Correct exponent based on radix position, and shift significand as needed
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// to represent user input
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// Overflow prevention
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if (exponent <= radixPosition && radixPosition - exponent > 1 << 14) {
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exponent = EXPONENT_MIN;
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}
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else {
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exponent = exponent - radixPosition;
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}
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// Attempt to normalize the exponent
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while (exponent > EXPONENT_MAX) {
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// Shift exponent to significand and decrease
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lastDigit = lastDigit + 1;
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if (lastDigit - firstDigit > MAX_DIGITS) {
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// Check if we have a zero then just hard clamp, otherwise fail
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var digitsString = digits.join('');
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if (digitsString.match(/^0+$/)) {
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exponent = EXPONENT_MAX;
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break;
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}
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invalidErr(representation, 'overflow');
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}
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exponent = exponent - 1;
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}
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while (exponent < EXPONENT_MIN || nDigitsStored < nDigits) {
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// Shift last digit. can only do this if < significant digits than # stored.
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if (lastDigit === 0 && significantDigits < nDigitsStored) {
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exponent = EXPONENT_MIN;
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significantDigits = 0;
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break;
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}
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if (nDigitsStored < nDigits) {
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// adjust to match digits not stored
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nDigits = nDigits - 1;
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}
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else {
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// adjust to round
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lastDigit = lastDigit - 1;
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}
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if (exponent < EXPONENT_MAX) {
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exponent = exponent + 1;
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}
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else {
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// Check if we have a zero then just hard clamp, otherwise fail
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var digitsString = digits.join('');
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if (digitsString.match(/^0+$/)) {
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exponent = EXPONENT_MAX;
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break;
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}
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invalidErr(representation, 'overflow');
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}
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}
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// Round
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// We've normalized the exponent, but might still need to round.
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if (lastDigit - firstDigit + 1 < significantDigits) {
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var endOfString = nDigitsRead;
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// If we have seen a radix point, 'string' is 1 longer than we have
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// documented with ndigits_read, so inc the position of the first nonzero
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// digit and the position that digits are read to.
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if (sawRadix) {
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firstNonZero = firstNonZero + 1;
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endOfString = endOfString + 1;
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}
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// if negative, we need to increment again to account for - sign at start.
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if (isNegative) {
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firstNonZero = firstNonZero + 1;
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endOfString = endOfString + 1;
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}
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var roundDigit = parseInt(representation[firstNonZero + lastDigit + 1], 10);
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var roundBit = 0;
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||
|
|
if (roundDigit >= 5) {
|
||
|
|
roundBit = 1;
|
||
|
|
if (roundDigit === 5) {
|
||
|
|
roundBit = digits[lastDigit] % 2 === 1 ? 1 : 0;
|
||
|
|
for (i = firstNonZero + lastDigit + 2; i < endOfString; i++) {
|
||
|
|
if (parseInt(representation[i], 10)) {
|
||
|
|
roundBit = 1;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (roundBit) {
|
||
|
|
var dIdx = lastDigit;
|
||
|
|
for (; dIdx >= 0; dIdx--) {
|
||
|
|
if (++digits[dIdx] > 9) {
|
||
|
|
digits[dIdx] = 0;
|
||
|
|
// overflowed most significant digit
|
||
|
|
if (dIdx === 0) {
|
||
|
|
if (exponent < EXPONENT_MAX) {
|
||
|
|
exponent = exponent + 1;
|
||
|
|
digits[dIdx] = 1;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
return new Decimal128(buffer_1.Buffer.from(isNegative ? INF_NEGATIVE_BUFFER : INF_POSITIVE_BUFFER));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
// Encode significand
|
||
|
|
// The high 17 digits of the significand
|
||
|
|
significandHigh = long_1.Long.fromNumber(0);
|
||
|
|
// The low 17 digits of the significand
|
||
|
|
significandLow = long_1.Long.fromNumber(0);
|
||
|
|
// read a zero
|
||
|
|
if (significantDigits === 0) {
|
||
|
|
significandHigh = long_1.Long.fromNumber(0);
|
||
|
|
significandLow = long_1.Long.fromNumber(0);
|
||
|
|
}
|
||
|
|
else if (lastDigit - firstDigit < 17) {
|
||
|
|
var dIdx = firstDigit;
|
||
|
|
significandLow = long_1.Long.fromNumber(digits[dIdx++]);
|
||
|
|
significandHigh = new long_1.Long(0, 0);
|
||
|
|
for (; dIdx <= lastDigit; dIdx++) {
|
||
|
|
significandLow = significandLow.multiply(long_1.Long.fromNumber(10));
|
||
|
|
significandLow = significandLow.add(long_1.Long.fromNumber(digits[dIdx]));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
var dIdx = firstDigit;
|
||
|
|
significandHigh = long_1.Long.fromNumber(digits[dIdx++]);
|
||
|
|
for (; dIdx <= lastDigit - 17; dIdx++) {
|
||
|
|
significandHigh = significandHigh.multiply(long_1.Long.fromNumber(10));
|
||
|
|
significandHigh = significandHigh.add(long_1.Long.fromNumber(digits[dIdx]));
|
||
|
|
}
|
||
|
|
significandLow = long_1.Long.fromNumber(digits[dIdx++]);
|
||
|
|
for (; dIdx <= lastDigit; dIdx++) {
|
||
|
|
significandLow = significandLow.multiply(long_1.Long.fromNumber(10));
|
||
|
|
significandLow = significandLow.add(long_1.Long.fromNumber(digits[dIdx]));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
var significand = multiply64x2(significandHigh, long_1.Long.fromString('100000000000000000'));
|
||
|
|
significand.low = significand.low.add(significandLow);
|
||
|
|
if (lessThan(significand.low, significandLow)) {
|
||
|
|
significand.high = significand.high.add(long_1.Long.fromNumber(1));
|
||
|
|
}
|
||
|
|
// Biased exponent
|
||
|
|
biasedExponent = exponent + EXPONENT_BIAS;
|
||
|
|
var dec = { low: long_1.Long.fromNumber(0), high: long_1.Long.fromNumber(0) };
|
||
|
|
// Encode combination, exponent, and significand.
|
||
|
|
if (significand.high.shiftRightUnsigned(49).and(long_1.Long.fromNumber(1)).equals(long_1.Long.fromNumber(1))) {
|
||
|
|
// Encode '11' into bits 1 to 3
|
||
|
|
dec.high = dec.high.or(long_1.Long.fromNumber(0x3).shiftLeft(61));
|
||
|
|
dec.high = dec.high.or(long_1.Long.fromNumber(biasedExponent).and(long_1.Long.fromNumber(0x3fff).shiftLeft(47)));
|
||
|
|
dec.high = dec.high.or(significand.high.and(long_1.Long.fromNumber(0x7fffffffffff)));
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
dec.high = dec.high.or(long_1.Long.fromNumber(biasedExponent & 0x3fff).shiftLeft(49));
|
||
|
|
dec.high = dec.high.or(significand.high.and(long_1.Long.fromNumber(0x1ffffffffffff)));
|
||
|
|
}
|
||
|
|
dec.low = significand.low;
|
||
|
|
// Encode sign
|
||
|
|
if (isNegative) {
|
||
|
|
dec.high = dec.high.or(long_1.Long.fromString('9223372036854775808'));
|
||
|
|
}
|
||
|
|
// Encode into a buffer
|
||
|
|
var buffer = buffer_1.Buffer.alloc(16);
|
||
|
|
index = 0;
|
||
|
|
// Encode the low 64 bits of the decimal
|
||
|
|
// Encode low bits
|
||
|
|
buffer[index++] = dec.low.low & 0xff;
|
||
|
|
buffer[index++] = (dec.low.low >> 8) & 0xff;
|
||
|
|
buffer[index++] = (dec.low.low >> 16) & 0xff;
|
||
|
|
buffer[index++] = (dec.low.low >> 24) & 0xff;
|
||
|
|
// Encode high bits
|
||
|
|
buffer[index++] = dec.low.high & 0xff;
|
||
|
|
buffer[index++] = (dec.low.high >> 8) & 0xff;
|
||
|
|
buffer[index++] = (dec.low.high >> 16) & 0xff;
|
||
|
|
buffer[index++] = (dec.low.high >> 24) & 0xff;
|
||
|
|
// Encode the high 64 bits of the decimal
|
||
|
|
// Encode low bits
|
||
|
|
buffer[index++] = dec.high.low & 0xff;
|
||
|
|
buffer[index++] = (dec.high.low >> 8) & 0xff;
|
||
|
|
buffer[index++] = (dec.high.low >> 16) & 0xff;
|
||
|
|
buffer[index++] = (dec.high.low >> 24) & 0xff;
|
||
|
|
// Encode high bits
|
||
|
|
buffer[index++] = dec.high.high & 0xff;
|
||
|
|
buffer[index++] = (dec.high.high >> 8) & 0xff;
|
||
|
|
buffer[index++] = (dec.high.high >> 16) & 0xff;
|
||
|
|
buffer[index++] = (dec.high.high >> 24) & 0xff;
|
||
|
|
// Return the new Decimal128
|
||
|
|
return new Decimal128(buffer);
|
||
|
|
};
|
||
|
|
/** Create a string representation of the raw Decimal128 value */
|
||
|
|
Decimal128.prototype.toString = function () {
|
||
|
|
// Note: bits in this routine are referred to starting at 0,
|
||
|
|
// from the sign bit, towards the coefficient.
|
||
|
|
// decoded biased exponent (14 bits)
|
||
|
|
var biased_exponent;
|
||
|
|
// the number of significand digits
|
||
|
|
var significand_digits = 0;
|
||
|
|
// the base-10 digits in the significand
|
||
|
|
var significand = new Array(36);
|
||
|
|
for (var i = 0; i < significand.length; i++)
|
||
|
|
significand[i] = 0;
|
||
|
|
// read pointer into significand
|
||
|
|
var index = 0;
|
||
|
|
// true if the number is zero
|
||
|
|
var is_zero = false;
|
||
|
|
// the most significant significand bits (50-46)
|
||
|
|
var significand_msb;
|
||
|
|
// temporary storage for significand decoding
|
||
|
|
var significand128 = { parts: [0, 0, 0, 0] };
|
||
|
|
// indexing variables
|
||
|
|
var j, k;
|
||
|
|
// Output string
|
||
|
|
var string = [];
|
||
|
|
// Unpack index
|
||
|
|
index = 0;
|
||
|
|
// Buffer reference
|
||
|
|
var buffer = this.bytes;
|
||
|
|
// Unpack the low 64bits into a long
|
||
|
|
// bits 96 - 127
|
||
|
|
var low = buffer[index++] | (buffer[index++] << 8) | (buffer[index++] << 16) | (buffer[index++] << 24);
|
||
|
|
// bits 64 - 95
|
||
|
|
var midl = buffer[index++] | (buffer[index++] << 8) | (buffer[index++] << 16) | (buffer[index++] << 24);
|
||
|
|
// Unpack the high 64bits into a long
|
||
|
|
// bits 32 - 63
|
||
|
|
var midh = buffer[index++] | (buffer[index++] << 8) | (buffer[index++] << 16) | (buffer[index++] << 24);
|
||
|
|
// bits 0 - 31
|
||
|
|
var high = buffer[index++] | (buffer[index++] << 8) | (buffer[index++] << 16) | (buffer[index++] << 24);
|
||
|
|
// Unpack index
|
||
|
|
index = 0;
|
||
|
|
// Create the state of the decimal
|
||
|
|
var dec = {
|
||
|
|
low: new long_1.Long(low, midl),
|
||
|
|
high: new long_1.Long(midh, high)
|
||
|
|
};
|
||
|
|
if (dec.high.lessThan(long_1.Long.ZERO)) {
|
||
|
|
string.push('-');
|
||
|
|
}
|
||
|
|
// Decode combination field and exponent
|
||
|
|
// bits 1 - 5
|
||
|
|
var combination = (high >> 26) & COMBINATION_MASK;
|
||
|
|
if (combination >> 3 === 3) {
|
||
|
|
// Check for 'special' values
|
||
|
|
if (combination === COMBINATION_INFINITY) {
|
||
|
|
return string.join('') + 'Infinity';
|
||
|
|
}
|
||
|
|
else if (combination === COMBINATION_NAN) {
|
||
|
|
return 'NaN';
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
biased_exponent = (high >> 15) & EXPONENT_MASK;
|
||
|
|
significand_msb = 0x08 + ((high >> 14) & 0x01);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
significand_msb = (high >> 14) & 0x07;
|
||
|
|
biased_exponent = (high >> 17) & EXPONENT_MASK;
|
||
|
|
}
|
||
|
|
// unbiased exponent
|
||
|
|
var exponent = biased_exponent - EXPONENT_BIAS;
|
||
|
|
// Create string of significand digits
|
||
|
|
// Convert the 114-bit binary number represented by
|
||
|
|
// (significand_high, significand_low) to at most 34 decimal
|
||
|
|
// digits through modulo and division.
|
||
|
|
significand128.parts[0] = (high & 0x3fff) + ((significand_msb & 0xf) << 14);
|
||
|
|
significand128.parts[1] = midh;
|
||
|
|
significand128.parts[2] = midl;
|
||
|
|
significand128.parts[3] = low;
|
||
|
|
if (significand128.parts[0] === 0 &&
|
||
|
|
significand128.parts[1] === 0 &&
|
||
|
|
significand128.parts[2] === 0 &&
|
||
|
|
significand128.parts[3] === 0) {
|
||
|
|
is_zero = true;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
for (k = 3; k >= 0; k--) {
|
||
|
|
var least_digits = 0;
|
||
|
|
// Perform the divide
|
||
|
|
var result = divideu128(significand128);
|
||
|
|
significand128 = result.quotient;
|
||
|
|
least_digits = result.rem.low;
|
||
|
|
// We now have the 9 least significant digits (in base 2).
|
||
|
|
// Convert and output to string.
|
||
|
|
if (!least_digits)
|
||
|
|
continue;
|
||
|
|
for (j = 8; j >= 0; j--) {
|
||
|
|
// significand[k * 9 + j] = Math.round(least_digits % 10);
|
||
|
|
significand[k * 9 + j] = least_digits % 10;
|
||
|
|
// least_digits = Math.round(least_digits / 10);
|
||
|
|
least_digits = Math.floor(least_digits / 10);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
// Output format options:
|
||
|
|
// Scientific - [-]d.dddE(+/-)dd or [-]dE(+/-)dd
|
||
|
|
// Regular - ddd.ddd
|
||
|
|
if (is_zero) {
|
||
|
|
significand_digits = 1;
|
||
|
|
significand[index] = 0;
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
significand_digits = 36;
|
||
|
|
while (!significand[index]) {
|
||
|
|
significand_digits = significand_digits - 1;
|
||
|
|
index = index + 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
// the exponent if scientific notation is used
|
||
|
|
var scientific_exponent = significand_digits - 1 + exponent;
|
||
|
|
// The scientific exponent checks are dictated by the string conversion
|
||
|
|
// specification and are somewhat arbitrary cutoffs.
|
||
|
|
//
|
||
|
|
// We must check exponent > 0, because if this is the case, the number
|
||
|
|
// has trailing zeros. However, we *cannot* output these trailing zeros,
|
||
|
|
// because doing so would change the precision of the value, and would
|
||
|
|
// change stored data if the string converted number is round tripped.
|
||
|
|
if (scientific_exponent >= 34 || scientific_exponent <= -7 || exponent > 0) {
|
||
|
|
// Scientific format
|
||
|
|
// if there are too many significant digits, we should just be treating numbers
|
||
|
|
// as + or - 0 and using the non-scientific exponent (this is for the "invalid
|
||
|
|
// representation should be treated as 0/-0" spec cases in decimal128-1.json)
|
||
|
|
if (significand_digits > 34) {
|
||
|
|
string.push("" + 0);
|
||
|
|
if (exponent > 0)
|
||
|
|
string.push('E+' + exponent);
|
||
|
|
else if (exponent < 0)
|
||
|
|
string.push('E' + exponent);
|
||
|
|
return string.join('');
|
||
|
|
}
|
||
|
|
string.push("" + significand[index++]);
|
||
|
|
significand_digits = significand_digits - 1;
|
||
|
|
if (significand_digits) {
|
||
|
|
string.push('.');
|
||
|
|
}
|
||
|
|
for (var i = 0; i < significand_digits; i++) {
|
||
|
|
string.push("" + significand[index++]);
|
||
|
|
}
|
||
|
|
// Exponent
|
||
|
|
string.push('E');
|
||
|
|
if (scientific_exponent > 0) {
|
||
|
|
string.push('+' + scientific_exponent);
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
string.push("" + scientific_exponent);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
// Regular format with no decimal place
|
||
|
|
if (exponent >= 0) {
|
||
|
|
for (var i = 0; i < significand_digits; i++) {
|
||
|
|
string.push("" + significand[index++]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
var radix_position = significand_digits + exponent;
|
||
|
|
// non-zero digits before radix
|
||
|
|
if (radix_position > 0) {
|
||
|
|
for (var i = 0; i < radix_position; i++) {
|
||
|
|
string.push("" + significand[index++]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
string.push('0');
|
||
|
|
}
|
||
|
|
string.push('.');
|
||
|
|
// add leading zeros after radix
|
||
|
|
while (radix_position++ < 0) {
|
||
|
|
string.push('0');
|
||
|
|
}
|
||
|
|
for (var i = 0; i < significand_digits - Math.max(radix_position - 1, 0); i++) {
|
||
|
|
string.push("" + significand[index++]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return string.join('');
|
||
|
|
};
|
||
|
|
Decimal128.prototype.toJSON = function () {
|
||
|
|
return { $numberDecimal: this.toString() };
|
||
|
|
};
|
||
|
|
/** @internal */
|
||
|
|
Decimal128.prototype.toExtendedJSON = function () {
|
||
|
|
return { $numberDecimal: this.toString() };
|
||
|
|
};
|
||
|
|
/** @internal */
|
||
|
|
Decimal128.fromExtendedJSON = function (doc) {
|
||
|
|
return Decimal128.fromString(doc.$numberDecimal);
|
||
|
|
};
|
||
|
|
/** @internal */
|
||
|
|
Decimal128.prototype[Symbol.for('nodejs.util.inspect.custom')] = function () {
|
||
|
|
return this.inspect();
|
||
|
|
};
|
||
|
|
Decimal128.prototype.inspect = function () {
|
||
|
|
return "new Decimal128(\"" + this.toString() + "\")";
|
||
|
|
};
|
||
|
|
return Decimal128;
|
||
|
|
}());
|
||
|
|
exports.Decimal128 = Decimal128;
|
||
|
|
Object.defineProperty(Decimal128.prototype, '_bsontype', { value: 'Decimal128' });
|
||
|
|
//# sourceMappingURL=decimal128.js.map
|