Index: node_modules/decimal.js-light/decimal.mjs =================================================================== --- node_modules/decimal.js-light/decimal.mjs (revision a762898ecd37a452c782821d4c2c4955c6ed2521) +++ node_modules/decimal.js-light/decimal.mjs (revision a762898ecd37a452c782821d4c2c4955c6ed2521) @@ -0,0 +1,1985 @@ +/* + * decimal.js-light v2.5.1 + * An arbitrary-precision Decimal type for JavaScript. + * https://github.com/MikeMcl/decimal.js-light + * Copyright (c) 2020 Michael Mclaughlin + * MIT Expat Licence + */ + + +// ------------------------------------ EDITABLE DEFAULTS ------------------------------------- // + + +// The limit on the value of `precision`, and on the value of the first argument to +// `toDecimalPlaces`, `toExponential`, `toFixed`, `toPrecision` and `toSignificantDigits`. +var MAX_DIGITS = 1e9, // 0 to 1e9 + + + // The initial configuration properties of the Decimal constructor. + defaults = { + + // These values must be integers within the stated ranges (inclusive). + // Most of these values can be changed during run-time using `Decimal.config`. + + // The maximum number of significant digits of the result of a calculation or base conversion. + // E.g. `Decimal.config({ precision: 20 });` + precision: 20, // 1 to MAX_DIGITS + + // The rounding mode used by default by `toInteger`, `toDecimalPlaces`, `toExponential`, + // `toFixed`, `toPrecision` and `toSignificantDigits`. + // + // ROUND_UP 0 Away from zero. + // ROUND_DOWN 1 Towards zero. + // ROUND_CEIL 2 Towards +Infinity. + // ROUND_FLOOR 3 Towards -Infinity. + // ROUND_HALF_UP 4 Towards nearest neighbour. If equidistant, up. + // ROUND_HALF_DOWN 5 Towards nearest neighbour. If equidistant, down. + // ROUND_HALF_EVEN 6 Towards nearest neighbour. If equidistant, towards even neighbour. + // ROUND_HALF_CEIL 7 Towards nearest neighbour. If equidistant, towards +Infinity. + // ROUND_HALF_FLOOR 8 Towards nearest neighbour. If equidistant, towards -Infinity. + // + // E.g. + // `Decimal.rounding = 4;` + // `Decimal.rounding = Decimal.ROUND_HALF_UP;` + rounding: 4, // 0 to 8 + + // The exponent value at and beneath which `toString` returns exponential notation. + // JavaScript numbers: -7 + toExpNeg: -7, // 0 to -MAX_E + + // The exponent value at and above which `toString` returns exponential notation. + // JavaScript numbers: 21 + toExpPos: 21, // 0 to MAX_E + + // The natural logarithm of 10. + // 115 digits + LN10: '2.302585092994045684017991454684364207601101488628772976033327900967572609677352480235997205089598298341967784042286' + }, + + +// ------------------------------------ END OF EDITABLE DEFAULTS -------------------------------- // + + + Decimal, + external = true, + + decimalError = '[DecimalError] ', + invalidArgument = decimalError + 'Invalid argument: ', + exponentOutOfRange = decimalError + 'Exponent out of range: ', + + mathfloor = Math.floor, + mathpow = Math.pow, + + isDecimal = /^(\d+(\.\d*)?|\.\d+)(e[+-]?\d+)?$/i, + + ONE, + BASE = 1e7, + LOG_BASE = 7, + MAX_SAFE_INTEGER = 9007199254740991, + MAX_E = mathfloor(MAX_SAFE_INTEGER / LOG_BASE), // 1286742750677284 + + // Decimal.prototype object + P = {}; + + +// Decimal prototype methods + + +/* + * absoluteValue abs + * comparedTo cmp + * decimalPlaces dp + * dividedBy div + * dividedToIntegerBy idiv + * equals eq + * exponent + * greaterThan gt + * greaterThanOrEqualTo gte + * isInteger isint + * isNegative isneg + * isPositive ispos + * isZero + * lessThan lt + * lessThanOrEqualTo lte + * logarithm log + * minus sub + * modulo mod + * naturalExponential exp + * naturalLogarithm ln + * negated neg + * plus add + * precision sd + * squareRoot sqrt + * times mul + * toDecimalPlaces todp + * toExponential + * toFixed + * toInteger toint + * toNumber + * toPower pow + * toPrecision + * toSignificantDigits tosd + * toString + * valueOf val + */ + + +/* + * Return a new Decimal whose value is the absolute value of this Decimal. + * + */ +P.absoluteValue = P.abs = function () { + var x = new this.constructor(this); + if (x.s) x.s = 1; + return x; +}; + + +/* + * Return + * 1 if the value of this Decimal is greater than the value of `y`, + * -1 if the value of this Decimal is less than the value of `y`, + * 0 if they have the same value + * + */ +P.comparedTo = P.cmp = function (y) { + var i, j, xdL, ydL, + x = this; + + y = new x.constructor(y); + + // Signs differ? + if (x.s !== y.s) return x.s || -y.s; + + // Compare exponents. + if (x.e !== y.e) return x.e > y.e ^ x.s < 0 ? 1 : -1; + + xdL = x.d.length; + ydL = y.d.length; + + // Compare digit by digit. + for (i = 0, j = xdL < ydL ? xdL : ydL; i < j; ++i) { + if (x.d[i] !== y.d[i]) return x.d[i] > y.d[i] ^ x.s < 0 ? 1 : -1; + } + + // Compare lengths. + return xdL === ydL ? 0 : xdL > ydL ^ x.s < 0 ? 1 : -1; +}; + + +/* + * Return the number of decimal places of the value of this Decimal. + * + */ +P.decimalPlaces = P.dp = function () { + var x = this, + w = x.d.length - 1, + dp = (w - x.e) * LOG_BASE; + + // Subtract the number of trailing zeros of the last word. + w = x.d[w]; + if (w) for (; w % 10 == 0; w /= 10) dp--; + + return dp < 0 ? 0 : dp; +}; + + +/* + * Return a new Decimal whose value is the value of this Decimal divided by `y`, truncated to + * `precision` significant digits. + * + */ +P.dividedBy = P.div = function (y) { + return divide(this, new this.constructor(y)); +}; + + +/* + * Return a new Decimal whose value is the integer part of dividing the value of this Decimal + * by the value of `y`, truncated to `precision` significant digits. + * + */ +P.dividedToIntegerBy = P.idiv = function (y) { + var x = this, + Ctor = x.constructor; + return round(divide(x, new Ctor(y), 0, 1), Ctor.precision); +}; + + +/* + * Return true if the value of this Decimal is equal to the value of `y`, otherwise return false. + * + */ +P.equals = P.eq = function (y) { + return !this.cmp(y); +}; + + +/* + * Return the (base 10) exponent value of this Decimal (this.e is the base 10000000 exponent). + * + */ +P.exponent = function () { + return getBase10Exponent(this); +}; + + +/* + * Return true if the value of this Decimal is greater than the value of `y`, otherwise return + * false. + * + */ +P.greaterThan = P.gt = function (y) { + return this.cmp(y) > 0; +}; + + +/* + * Return true if the value of this Decimal is greater than or equal to the value of `y`, + * otherwise return false. + * + */ +P.greaterThanOrEqualTo = P.gte = function (y) { + return this.cmp(y) >= 0; +}; + + +/* + * Return true if the value of this Decimal is an integer, otherwise return false. + * + */ +P.isInteger = P.isint = function () { + return this.e > this.d.length - 2; +}; + + +/* + * Return true if the value of this Decimal is negative, otherwise return false. + * + */ +P.isNegative = P.isneg = function () { + return this.s < 0; +}; + + +/* + * Return true if the value of this Decimal is positive, otherwise return false. + * + */ +P.isPositive = P.ispos = function () { + return this.s > 0; +}; + + +/* + * Return true if the value of this Decimal is 0, otherwise return false. + * + */ +P.isZero = function () { + return this.s === 0; +}; + + +/* + * Return true if the value of this Decimal is less than `y`, otherwise return false. + * + */ +P.lessThan = P.lt = function (y) { + return this.cmp(y) < 0; +}; + + +/* + * Return true if the value of this Decimal is less than or equal to `y`, otherwise return false. + * + */ +P.lessThanOrEqualTo = P.lte = function (y) { + return this.cmp(y) < 1; +}; + + +/* + * Return the logarithm of the value of this Decimal to the specified base, truncated to + * `precision` significant digits. + * + * If no base is specified, return log[10](x). + * + * log[base](x) = ln(x) / ln(base) + * + * The maximum error of the result is 1 ulp (unit in the last place). + * + * [base] {number|string|Decimal} The base of the logarithm. + * + */ +P.logarithm = P.log = function (base) { + var r, + x = this, + Ctor = x.constructor, + pr = Ctor.precision, + wpr = pr + 5; + + // Default base is 10. + if (base === void 0) { + base = new Ctor(10); + } else { + base = new Ctor(base); + + // log[-b](x) = NaN + // log[0](x) = NaN + // log[1](x) = NaN + if (base.s < 1 || base.eq(ONE)) throw Error(decimalError + 'NaN'); + } + + // log[b](-x) = NaN + // log[b](0) = -Infinity + if (x.s < 1) throw Error(decimalError + (x.s ? 'NaN' : '-Infinity')); + + // log[b](1) = 0 + if (x.eq(ONE)) return new Ctor(0); + + external = false; + r = divide(ln(x, wpr), ln(base, wpr), wpr); + external = true; + + return round(r, pr); +}; + + +/* + * Return a new Decimal whose value is the value of this Decimal minus `y`, truncated to + * `precision` significant digits. + * + */ +P.minus = P.sub = function (y) { + var x = this; + y = new x.constructor(y); + return x.s == y.s ? subtract(x, y) : add(x, (y.s = -y.s, y)); +}; + + +/* + * Return a new Decimal whose value is the value of this Decimal modulo `y`, truncated to + * `precision` significant digits. + * + */ +P.modulo = P.mod = function (y) { + var q, + x = this, + Ctor = x.constructor, + pr = Ctor.precision; + + y = new Ctor(y); + + // x % 0 = NaN + if (!y.s) throw Error(decimalError + 'NaN'); + + // Return x if x is 0. + if (!x.s) return round(new Ctor(x), pr); + + // Prevent rounding of intermediate calculations. + external = false; + q = divide(x, y, 0, 1).times(y); + external = true; + + return x.minus(q); +}; + + +/* + * Return a new Decimal whose value is the natural exponential of the value of this Decimal, + * i.e. the base e raised to the power the value of this Decimal, truncated to `precision` + * significant digits. + * + */ +P.naturalExponential = P.exp = function () { + return exp(this); +}; + + +/* + * Return a new Decimal whose value is the natural logarithm of the value of this Decimal, + * truncated to `precision` significant digits. + * + */ +P.naturalLogarithm = P.ln = function () { + return ln(this); +}; + + +/* + * Return a new Decimal whose value is the value of this Decimal negated, i.e. as if multiplied by + * -1. + * + */ +P.negated = P.neg = function () { + var x = new this.constructor(this); + x.s = -x.s || 0; + return x; +}; + + +/* + * Return a new Decimal whose value is the value of this Decimal plus `y`, truncated to + * `precision` significant digits. + * + */ +P.plus = P.add = function (y) { + var x = this; + y = new x.constructor(y); + return x.s == y.s ? add(x, y) : subtract(x, (y.s = -y.s, y)); +}; + + +/* + * Return the number of significant digits of the value of this Decimal. + * + * [z] {boolean|number} Whether to count integer-part trailing zeros: true, false, 1 or 0. + * + */ +P.precision = P.sd = function (z) { + var e, sd, w, + x = this; + + if (z !== void 0 && z !== !!z && z !== 1 && z !== 0) throw Error(invalidArgument + z); + + e = getBase10Exponent(x) + 1; + w = x.d.length - 1; + sd = w * LOG_BASE + 1; + w = x.d[w]; + + // If non-zero... + if (w) { + + // Subtract the number of trailing zeros of the last word. + for (; w % 10 == 0; w /= 10) sd--; + + // Add the number of digits of the first word. + for (w = x.d[0]; w >= 10; w /= 10) sd++; + } + + return z && e > sd ? e : sd; +}; + + +/* + * Return a new Decimal whose value is the square root of this Decimal, truncated to `precision` + * significant digits. + * + */ +P.squareRoot = P.sqrt = function () { + var e, n, pr, r, s, t, wpr, + x = this, + Ctor = x.constructor; + + // Negative or zero? + if (x.s < 1) { + if (!x.s) return new Ctor(0); + + // sqrt(-x) = NaN + throw Error(decimalError + 'NaN'); + } + + e = getBase10Exponent(x); + external = false; + + // Initial estimate. + s = Math.sqrt(+x); + + // Math.sqrt underflow/overflow? + // Pass x to Math.sqrt as integer, then adjust the exponent of the result. + if (s == 0 || s == 1 / 0) { + n = digitsToString(x.d); + if ((n.length + e) % 2 == 0) n += '0'; + s = Math.sqrt(n); + e = mathfloor((e + 1) / 2) - (e < 0 || e % 2); + + if (s == 1 / 0) { + n = '5e' + e; + } else { + n = s.toExponential(); + n = n.slice(0, n.indexOf('e') + 1) + e; + } + + r = new Ctor(n); + } else { + r = new Ctor(s.toString()); + } + + pr = Ctor.precision; + s = wpr = pr + 3; + + // Newton-Raphson iteration. + for (;;) { + t = r; + r = t.plus(divide(x, t, wpr + 2)).times(0.5); + + if (digitsToString(t.d).slice(0, wpr) === (n = digitsToString(r.d)).slice(0, wpr)) { + n = n.slice(wpr - 3, wpr + 1); + + // The 4th rounding digit may be in error by -1 so if the 4 rounding digits are 9999 or + // 4999, i.e. approaching a rounding boundary, continue the iteration. + if (s == wpr && n == '4999') { + + // On the first iteration only, check to see if rounding up gives the exact result as the + // nines may infinitely repeat. + round(t, pr + 1, 0); + + if (t.times(t).eq(x)) { + r = t; + break; + } + } else if (n != '9999') { + break; + } + + wpr += 4; + } + } + + external = true; + + return round(r, pr); +}; + + +/* + * Return a new Decimal whose value is the value of this Decimal times `y`, truncated to + * `precision` significant digits. + * + */ +P.times = P.mul = function (y) { + var carry, e, i, k, r, rL, t, xdL, ydL, + x = this, + Ctor = x.constructor, + xd = x.d, + yd = (y = new Ctor(y)).d; + + // Return 0 if either is 0. + if (!x.s || !y.s) return new Ctor(0); + + y.s *= x.s; + e = x.e + y.e; + xdL = xd.length; + ydL = yd.length; + + // Ensure xd points to the longer array. + if (xdL < ydL) { + r = xd; + xd = yd; + yd = r; + rL = xdL; + xdL = ydL; + ydL = rL; + } + + // Initialise the result array with zeros. + r = []; + rL = xdL + ydL; + for (i = rL; i--;) r.push(0); + + // Multiply! + for (i = ydL; --i >= 0;) { + carry = 0; + for (k = xdL + i; k > i;) { + t = r[k] + yd[i] * xd[k - i - 1] + carry; + r[k--] = t % BASE | 0; + carry = t / BASE | 0; + } + + r[k] = (r[k] + carry) % BASE | 0; + } + + // Remove trailing zeros. + for (; !r[--rL];) r.pop(); + + if (carry) ++e; + else r.shift(); + + y.d = r; + y.e = e; + + return external ? round(y, Ctor.precision) : y; +}; + + +/* + * Return a new Decimal whose value is the value of this Decimal rounded to a maximum of `dp` + * decimal places using rounding mode `rm` or `rounding` if `rm` is omitted. + * + * If `dp` is omitted, return a new Decimal whose value is the value of this Decimal. + * + * [dp] {number} Decimal places. Integer, 0 to MAX_DIGITS inclusive. + * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive. + * + */ +P.toDecimalPlaces = P.todp = function (dp, rm) { + var x = this, + Ctor = x.constructor; + + x = new Ctor(x); + if (dp === void 0) return x; + + checkInt32(dp, 0, MAX_DIGITS); + + if (rm === void 0) rm = Ctor.rounding; + else checkInt32(rm, 0, 8); + + return round(x, dp + getBase10Exponent(x) + 1, rm); +}; + + +/* + * Return a string representing the value of this Decimal in exponential notation rounded to + * `dp` fixed decimal places using rounding mode `rounding`. + * + * [dp] {number} Decimal places. Integer, 0 to MAX_DIGITS inclusive. + * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive. + * + */ +P.toExponential = function (dp, rm) { + var str, + x = this, + Ctor = x.constructor; + + if (dp === void 0) { + str = toString(x, true); + } else { + checkInt32(dp, 0, MAX_DIGITS); + + if (rm === void 0) rm = Ctor.rounding; + else checkInt32(rm, 0, 8); + + x = round(new Ctor(x), dp + 1, rm); + str = toString(x, true, dp + 1); + } + + return str; +}; + + +/* + * Return a string representing the value of this Decimal in normal (fixed-point) notation to + * `dp` fixed decimal places and rounded using rounding mode `rm` or `rounding` if `rm` is + * omitted. + * + * As with JavaScript numbers, (-0).toFixed(0) is '0', but e.g. (-0.00001).toFixed(0) is '-0'. + * + * [dp] {number} Decimal places. Integer, 0 to MAX_DIGITS inclusive. + * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive. + * + * (-0).toFixed(0) is '0', but (-0.1).toFixed(0) is '-0'. + * (-0).toFixed(1) is '0.0', but (-0.01).toFixed(1) is '-0.0'. + * (-0).toFixed(3) is '0.000'. + * (-0.5).toFixed(0) is '-0'. + * + */ +P.toFixed = function (dp, rm) { + var str, y, + x = this, + Ctor = x.constructor; + + if (dp === void 0) return toString(x); + + checkInt32(dp, 0, MAX_DIGITS); + + if (rm === void 0) rm = Ctor.rounding; + else checkInt32(rm, 0, 8); + + y = round(new Ctor(x), dp + getBase10Exponent(x) + 1, rm); + str = toString(y.abs(), false, dp + getBase10Exponent(y) + 1); + + // To determine whether to add the minus sign look at the value before it was rounded, + // i.e. look at `x` rather than `y`. + return x.isneg() && !x.isZero() ? '-' + str : str; +}; + + +/* + * Return a new Decimal whose value is the value of this Decimal rounded to a whole number using + * rounding mode `rounding`. + * + */ +P.toInteger = P.toint = function () { + var x = this, + Ctor = x.constructor; + return round(new Ctor(x), getBase10Exponent(x) + 1, Ctor.rounding); +}; + + +/* + * Return the value of this Decimal converted to a number primitive. + * + */ +P.toNumber = function () { + return +this; +}; + + +/* + * Return a new Decimal whose value is the value of this Decimal raised to the power `y`, + * truncated to `precision` significant digits. + * + * For non-integer or very large exponents pow(x, y) is calculated using + * + * x^y = exp(y*ln(x)) + * + * The maximum error is 1 ulp (unit in last place). + * + * y {number|string|Decimal} The power to which to raise this Decimal. + * + */ +P.toPower = P.pow = function (y) { + var e, k, pr, r, sign, yIsInt, + x = this, + Ctor = x.constructor, + guard = 12, + yn = +(y = new Ctor(y)); + + // pow(x, 0) = 1 + if (!y.s) return new Ctor(ONE); + + x = new Ctor(x); + + // pow(0, y > 0) = 0 + // pow(0, y < 0) = Infinity + if (!x.s) { + if (y.s < 1) throw Error(decimalError + 'Infinity'); + return x; + } + + // pow(1, y) = 1 + if (x.eq(ONE)) return x; + + pr = Ctor.precision; + + // pow(x, 1) = x + if (y.eq(ONE)) return round(x, pr); + + e = y.e; + k = y.d.length - 1; + yIsInt = e >= k; + sign = x.s; + + if (!yIsInt) { + + // pow(x < 0, y non-integer) = NaN + if (sign < 0) throw Error(decimalError + 'NaN'); + + // If y is a small integer use the 'exponentiation by squaring' algorithm. + } else if ((k = yn < 0 ? -yn : yn) <= MAX_SAFE_INTEGER) { + r = new Ctor(ONE); + + // Max k of 9007199254740991 takes 53 loop iterations. + // Maximum digits array length; leaves [28, 34] guard digits. + e = Math.ceil(pr / LOG_BASE + 4); + + external = false; + + for (;;) { + if (k % 2) { + r = r.times(x); + truncate(r.d, e); + } + + k = mathfloor(k / 2); + if (k === 0) break; + + x = x.times(x); + truncate(x.d, e); + } + + external = true; + + return y.s < 0 ? new Ctor(ONE).div(r) : round(r, pr); + } + + // Result is negative if x is negative and the last digit of integer y is odd. + sign = sign < 0 && y.d[Math.max(e, k)] & 1 ? -1 : 1; + + x.s = 1; + external = false; + r = y.times(ln(x, pr + guard)); + external = true; + r = exp(r); + r.s = sign; + + return r; +}; + + +/* + * Return a string representing the value of this Decimal rounded to `sd` significant digits + * using rounding mode `rounding`. + * + * Return exponential notation if `sd` is less than the number of digits necessary to represent + * the integer part of the value in normal notation. + * + * [sd] {number} Significant digits. Integer, 1 to MAX_DIGITS inclusive. + * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive. + * + */ +P.toPrecision = function (sd, rm) { + var e, str, + x = this, + Ctor = x.constructor; + + if (sd === void 0) { + e = getBase10Exponent(x); + str = toString(x, e <= Ctor.toExpNeg || e >= Ctor.toExpPos); + } else { + checkInt32(sd, 1, MAX_DIGITS); + + if (rm === void 0) rm = Ctor.rounding; + else checkInt32(rm, 0, 8); + + x = round(new Ctor(x), sd, rm); + e = getBase10Exponent(x); + str = toString(x, sd <= e || e <= Ctor.toExpNeg, sd); + } + + return str; +}; + + +/* + * Return a new Decimal whose value is the value of this Decimal rounded to a maximum of `sd` + * significant digits using rounding mode `rm`, or to `precision` and `rounding` respectively if + * omitted. + * + * [sd] {number} Significant digits. Integer, 1 to MAX_DIGITS inclusive. + * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive. + * + */ +P.toSignificantDigits = P.tosd = function (sd, rm) { + var x = this, + Ctor = x.constructor; + + if (sd === void 0) { + sd = Ctor.precision; + rm = Ctor.rounding; + } else { + checkInt32(sd, 1, MAX_DIGITS); + + if (rm === void 0) rm = Ctor.rounding; + else checkInt32(rm, 0, 8); + } + + return round(new Ctor(x), sd, rm); +}; + + +/* + * Return a string representing the value of this Decimal. + * + * Return exponential notation if this Decimal has a positive exponent equal to or greater than + * `toExpPos`, or a negative exponent equal to or less than `toExpNeg`. + * + */ +P.toString = P.valueOf = P.val = P.toJSON = P[Symbol.for('nodejs.util.inspect.custom')] = function () { + var x = this, + e = getBase10Exponent(x), + Ctor = x.constructor; + + return toString(x, e <= Ctor.toExpNeg || e >= Ctor.toExpPos); +}; + + +// Helper functions for Decimal.prototype (P) and/or Decimal methods, and their callers. + + +/* + * add P.minus, P.plus + * checkInt32 P.todp, P.toExponential, P.toFixed, P.toPrecision, P.tosd + * digitsToString P.log, P.sqrt, P.pow, toString, exp, ln + * divide P.div, P.idiv, P.log, P.mod, P.sqrt, exp, ln + * exp P.exp, P.pow + * getBase10Exponent P.exponent, P.sd, P.toint, P.sqrt, P.todp, P.toFixed, P.toPrecision, + * P.toString, divide, round, toString, exp, ln + * getLn10 P.log, ln + * getZeroString digitsToString, toString + * ln P.log, P.ln, P.pow, exp + * parseDecimal Decimal + * round P.abs, P.idiv, P.log, P.minus, P.mod, P.neg, P.plus, P.toint, P.sqrt, + * P.times, P.todp, P.toExponential, P.toFixed, P.pow, P.toPrecision, P.tosd, + * divide, getLn10, exp, ln + * subtract P.minus, P.plus + * toString P.toExponential, P.toFixed, P.toPrecision, P.toString, P.valueOf + * truncate P.pow + * + * Throws: P.log, P.mod, P.sd, P.sqrt, P.pow, checkInt32, divide, round, + * getLn10, exp, ln, parseDecimal, Decimal, config + */ + + +function add(x, y) { + var carry, d, e, i, k, len, xd, yd, + Ctor = x.constructor, + pr = Ctor.precision; + + // If either is zero... + if (!x.s || !y.s) { + + // Return x if y is zero. + // Return y if y is non-zero. + if (!y.s) y = new Ctor(x); + return external ? round(y, pr) : y; + } + + xd = x.d; + yd = y.d; + + // x and y are finite, non-zero numbers with the same sign. + + k = x.e; + e = y.e; + xd = xd.slice(); + i = k - e; + + // If base 1e7 exponents differ... + if (i) { + if (i < 0) { + d = xd; + i = -i; + len = yd.length; + } else { + d = yd; + e = k; + len = xd.length; + } + + // Limit number of zeros prepended to max(ceil(pr / LOG_BASE), len) + 1. + k = Math.ceil(pr / LOG_BASE); + len = k > len ? k + 1 : len + 1; + + if (i > len) { + i = len; + d.length = 1; + } + + // Prepend zeros to equalise exponents. Note: Faster to use reverse then do unshifts. + d.reverse(); + for (; i--;) d.push(0); + d.reverse(); + } + + len = xd.length; + i = yd.length; + + // If yd is longer than xd, swap xd and yd so xd points to the longer array. + if (len - i < 0) { + i = len; + d = yd; + yd = xd; + xd = d; + } + + // Only start adding at yd.length - 1 as the further digits of xd can be left as they are. + for (carry = 0; i;) { + carry = (xd[--i] = xd[i] + yd[i] + carry) / BASE | 0; + xd[i] %= BASE; + } + + if (carry) { + xd.unshift(carry); + ++e; + } + + // Remove trailing zeros. + // No need to check for zero, as +x + +y != 0 && -x + -y != 0 + for (len = xd.length; xd[--len] == 0;) xd.pop(); + + y.d = xd; + y.e = e; + + return external ? round(y, pr) : y; +} + + +function checkInt32(i, min, max) { + if (i !== ~~i || i < min || i > max) { + throw Error(invalidArgument + i); + } +} + + +function digitsToString(d) { + var i, k, ws, + indexOfLastWord = d.length - 1, + str = '', + w = d[0]; + + if (indexOfLastWord > 0) { + str += w; + for (i = 1; i < indexOfLastWord; i++) { + ws = d[i] + ''; + k = LOG_BASE - ws.length; + if (k) str += getZeroString(k); + str += ws; + } + + w = d[i]; + ws = w + ''; + k = LOG_BASE - ws.length; + if (k) str += getZeroString(k); + } else if (w === 0) { + return '0'; + } + + // Remove trailing zeros of last w. + for (; w % 10 === 0;) w /= 10; + + return str + w; +} + + +var divide = (function () { + + // Assumes non-zero x and k, and hence non-zero result. + function multiplyInteger(x, k) { + var temp, + carry = 0, + i = x.length; + + for (x = x.slice(); i--;) { + temp = x[i] * k + carry; + x[i] = temp % BASE | 0; + carry = temp / BASE | 0; + } + + if (carry) x.unshift(carry); + + return x; + } + + function compare(a, b, aL, bL) { + var i, r; + + if (aL != bL) { + r = aL > bL ? 1 : -1; + } else { + for (i = r = 0; i < aL; i++) { + if (a[i] != b[i]) { + r = a[i] > b[i] ? 1 : -1; + break; + } + } + } + + return r; + } + + function subtract(a, b, aL) { + var i = 0; + + // Subtract b from a. + for (; aL--;) { + a[aL] -= i; + i = a[aL] < b[aL] ? 1 : 0; + a[aL] = i * BASE + a[aL] - b[aL]; + } + + // Remove leading zeros. + for (; !a[0] && a.length > 1;) a.shift(); + } + + return function (x, y, pr, dp) { + var cmp, e, i, k, prod, prodL, q, qd, rem, remL, rem0, sd, t, xi, xL, yd0, yL, yz, + Ctor = x.constructor, + sign = x.s == y.s ? 1 : -1, + xd = x.d, + yd = y.d; + + // Either 0? + if (!x.s) return new Ctor(x); + if (!y.s) throw Error(decimalError + 'Division by zero'); + + e = x.e - y.e; + yL = yd.length; + xL = xd.length; + q = new Ctor(sign); + qd = q.d = []; + + // Result exponent may be one less than e. + for (i = 0; yd[i] == (xd[i] || 0); ) ++i; + if (yd[i] > (xd[i] || 0)) --e; + + if (pr == null) { + sd = pr = Ctor.precision; + } else if (dp) { + sd = pr + (getBase10Exponent(x) - getBase10Exponent(y)) + 1; + } else { + sd = pr; + } + + if (sd < 0) return new Ctor(0); + + // Convert precision in number of base 10 digits to base 1e7 digits. + sd = sd / LOG_BASE + 2 | 0; + i = 0; + + // divisor < 1e7 + if (yL == 1) { + k = 0; + yd = yd[0]; + sd++; + + // k is the carry. + for (; (i < xL || k) && sd--; i++) { + t = k * BASE + (xd[i] || 0); + qd[i] = t / yd | 0; + k = t % yd | 0; + } + + // divisor >= 1e7 + } else { + + // Normalise xd and yd so highest order digit of yd is >= BASE/2 + k = BASE / (yd[0] + 1) | 0; + + if (k > 1) { + yd = multiplyInteger(yd, k); + xd = multiplyInteger(xd, k); + yL = yd.length; + xL = xd.length; + } + + xi = yL; + rem = xd.slice(0, yL); + remL = rem.length; + + // Add zeros to make remainder as long as divisor. + for (; remL < yL;) rem[remL++] = 0; + + yz = yd.slice(); + yz.unshift(0); + yd0 = yd[0]; + + if (yd[1] >= BASE / 2) ++yd0; + + do { + k = 0; + + // Compare divisor and remainder. + cmp = compare(yd, rem, yL, remL); + + // If divisor < remainder. + if (cmp < 0) { + + // Calculate trial digit, k. + rem0 = rem[0]; + if (yL != remL) rem0 = rem0 * BASE + (rem[1] || 0); + + // k will be how many times the divisor goes into the current remainder. + k = rem0 / yd0 | 0; + + // Algorithm: + // 1. product = divisor * trial digit (k) + // 2. if product > remainder: product -= divisor, k-- + // 3. remainder -= product + // 4. if product was < remainder at 2: + // 5. compare new remainder and divisor + // 6. If remainder > divisor: remainder -= divisor, k++ + + if (k > 1) { + if (k >= BASE) k = BASE - 1; + + // product = divisor * trial digit. + prod = multiplyInteger(yd, k); + prodL = prod.length; + remL = rem.length; + + // Compare product and remainder. + cmp = compare(prod, rem, prodL, remL); + + // product > remainder. + if (cmp == 1) { + k--; + + // Subtract divisor from product. + subtract(prod, yL < prodL ? yz : yd, prodL); + } + } else { + + // cmp is -1. + // If k is 0, there is no need to compare yd and rem again below, so change cmp to 1 + // to avoid it. If k is 1 there is a need to compare yd and rem again below. + if (k == 0) cmp = k = 1; + prod = yd.slice(); + } + + prodL = prod.length; + if (prodL < remL) prod.unshift(0); + + // Subtract product from remainder. + subtract(rem, prod, remL); + + // If product was < previous remainder. + if (cmp == -1) { + remL = rem.length; + + // Compare divisor and new remainder. + cmp = compare(yd, rem, yL, remL); + + // If divisor < new remainder, subtract divisor from remainder. + if (cmp < 1) { + k++; + + // Subtract divisor from remainder. + subtract(rem, yL < remL ? yz : yd, remL); + } + } + + remL = rem.length; + } else if (cmp === 0) { + k++; + rem = [0]; + } // if cmp === 1, k will be 0 + + // Add the next digit, k, to the result array. + qd[i++] = k; + + // Update the remainder. + if (cmp && rem[0]) { + rem[remL++] = xd[xi] || 0; + } else { + rem = [xd[xi]]; + remL = 1; + } + + } while ((xi++ < xL || rem[0] !== void 0) && sd--); + } + + // Leading zero? + if (!qd[0]) qd.shift(); + + q.e = e; + + return round(q, dp ? pr + getBase10Exponent(q) + 1 : pr); + }; +})(); + + +/* + * Return a new Decimal whose value is the natural exponential of `x` truncated to `sd` + * significant digits. + * + * Taylor/Maclaurin series. + * + * exp(x) = x^0/0! + x^1/1! + x^2/2! + x^3/3! + ... + * + * Argument reduction: + * Repeat x = x / 32, k += 5, until |x| < 0.1 + * exp(x) = exp(x / 2^k)^(2^k) + * + * Previously, the argument was initially reduced by + * exp(x) = exp(r) * 10^k where r = x - k * ln10, k = floor(x / ln10) + * to first put r in the range [0, ln10], before dividing by 32 until |x| < 0.1, but this was + * found to be slower than just dividing repeatedly by 32 as above. + * + * (Math object integer min/max: Math.exp(709) = 8.2e+307, Math.exp(-745) = 5e-324) + * + * exp(x) is non-terminating for any finite, non-zero x. + * + */ +function exp(x, sd) { + var denominator, guard, pow, sum, t, wpr, + i = 0, + k = 0, + Ctor = x.constructor, + pr = Ctor.precision; + + if (getBase10Exponent(x) > 16) throw Error(exponentOutOfRange + getBase10Exponent(x)); + + // exp(0) = 1 + if (!x.s) return new Ctor(ONE); + + if (sd == null) { + external = false; + wpr = pr; + } else { + wpr = sd; + } + + t = new Ctor(0.03125); + + while (x.abs().gte(0.1)) { + x = x.times(t); // x = x / 2^5 + k += 5; + } + + // Estimate the precision increase necessary to ensure the first 4 rounding digits are correct. + guard = Math.log(mathpow(2, k)) / Math.LN10 * 2 + 5 | 0; + wpr += guard; + denominator = pow = sum = new Ctor(ONE); + Ctor.precision = wpr; + + for (;;) { + pow = round(pow.times(x), wpr); + denominator = denominator.times(++i); + t = sum.plus(divide(pow, denominator, wpr)); + + if (digitsToString(t.d).slice(0, wpr) === digitsToString(sum.d).slice(0, wpr)) { + while (k--) sum = round(sum.times(sum), wpr); + Ctor.precision = pr; + return sd == null ? (external = true, round(sum, pr)) : sum; + } + + sum = t; + } +} + + +// Calculate the base 10 exponent from the base 1e7 exponent. +function getBase10Exponent(x) { + var e = x.e * LOG_BASE, + w = x.d[0]; + + // Add the number of digits of the first word of the digits array. + for (; w >= 10; w /= 10) e++; + return e; +} + + +function getLn10(Ctor, sd, pr) { + + if (sd > Ctor.LN10.sd()) { + + + // Reset global state in case the exception is caught. + external = true; + if (pr) Ctor.precision = pr; + throw Error(decimalError + 'LN10 precision limit exceeded'); + } + + return round(new Ctor(Ctor.LN10), sd); +} + + +function getZeroString(k) { + var zs = ''; + for (; k--;) zs += '0'; + return zs; +} + + +/* + * Return a new Decimal whose value is the natural logarithm of `x` truncated to `sd` significant + * digits. + * + * ln(n) is non-terminating (n != 1) + * + */ +function ln(y, sd) { + var c, c0, denominator, e, numerator, sum, t, wpr, x2, + n = 1, + guard = 10, + x = y, + xd = x.d, + Ctor = x.constructor, + pr = Ctor.precision; + + // ln(-x) = NaN + // ln(0) = -Infinity + if (x.s < 1) throw Error(decimalError + (x.s ? 'NaN' : '-Infinity')); + + // ln(1) = 0 + if (x.eq(ONE)) return new Ctor(0); + + if (sd == null) { + external = false; + wpr = pr; + } else { + wpr = sd; + } + + if (x.eq(10)) { + if (sd == null) external = true; + return getLn10(Ctor, wpr); + } + + wpr += guard; + Ctor.precision = wpr; + c = digitsToString(xd); + c0 = c.charAt(0); + e = getBase10Exponent(x); + + if (Math.abs(e) < 1.5e15) { + + // Argument reduction. + // The series converges faster the closer the argument is to 1, so using + // ln(a^b) = b * ln(a), ln(a) = ln(a^b) / b + // multiply the argument by itself until the leading digits of the significand are 7, 8, 9, + // 10, 11, 12 or 13, recording the number of multiplications so the sum of the series can + // later be divided by this number, then separate out the power of 10 using + // ln(a*10^b) = ln(a) + b*ln(10). + + // max n is 21 (gives 0.9, 1.0 or 1.1) (9e15 / 21 = 4.2e14). + //while (c0 < 9 && c0 != 1 || c0 == 1 && c.charAt(1) > 1) { + // max n is 6 (gives 0.7 - 1.3) + while (c0 < 7 && c0 != 1 || c0 == 1 && c.charAt(1) > 3) { + x = x.times(y); + c = digitsToString(x.d); + c0 = c.charAt(0); + n++; + } + + e = getBase10Exponent(x); + + if (c0 > 1) { + x = new Ctor('0.' + c); + e++; + } else { + x = new Ctor(c0 + '.' + c.slice(1)); + } + } else { + + // The argument reduction method above may result in overflow if the argument y is a massive + // number with exponent >= 1500000000000000 (9e15 / 6 = 1.5e15), so instead recall this + // function using ln(x*10^e) = ln(x) + e*ln(10). + t = getLn10(Ctor, wpr + 2, pr).times(e + ''); + x = ln(new Ctor(c0 + '.' + c.slice(1)), wpr - guard).plus(t); + + Ctor.precision = pr; + return sd == null ? (external = true, round(x, pr)) : x; + } + + // x is reduced to a value near 1. + + // Taylor series. + // ln(y) = ln((1 + x)/(1 - x)) = 2(x + x^3/3 + x^5/5 + x^7/7 + ...) + // where x = (y - 1)/(y + 1) (|x| < 1) + sum = numerator = x = divide(x.minus(ONE), x.plus(ONE), wpr); + x2 = round(x.times(x), wpr); + denominator = 3; + + for (;;) { + numerator = round(numerator.times(x2), wpr); + t = sum.plus(divide(numerator, new Ctor(denominator), wpr)); + + if (digitsToString(t.d).slice(0, wpr) === digitsToString(sum.d).slice(0, wpr)) { + sum = sum.times(2); + + // Reverse the argument reduction. + if (e !== 0) sum = sum.plus(getLn10(Ctor, wpr + 2, pr).times(e + '')); + sum = divide(sum, new Ctor(n), wpr); + + Ctor.precision = pr; + return sd == null ? (external = true, round(sum, pr)) : sum; + } + + sum = t; + denominator += 2; + } +} + + +/* + * Parse the value of a new Decimal `x` from string `str`. + */ +function parseDecimal(x, str) { + var e, i, len; + + // Decimal point? + if ((e = str.indexOf('.')) > -1) str = str.replace('.', ''); + + // Exponential form? + if ((i = str.search(/e/i)) > 0) { + + // Determine exponent. + if (e < 0) e = i; + e += +str.slice(i + 1); + str = str.substring(0, i); + } else if (e < 0) { + + // Integer. + e = str.length; + } + + // Determine leading zeros. + for (i = 0; str.charCodeAt(i) === 48;) ++i; + + // Determine trailing zeros. + for (len = str.length; str.charCodeAt(len - 1) === 48;) --len; + str = str.slice(i, len); + + if (str) { + len -= i; + e = e - i - 1; + x.e = mathfloor(e / LOG_BASE); + x.d = []; + + // Transform base + + // e is the base 10 exponent. + // i is where to slice str to get the first word of the digits array. + i = (e + 1) % LOG_BASE; + if (e < 0) i += LOG_BASE; + + if (i < len) { + if (i) x.d.push(+str.slice(0, i)); + for (len -= LOG_BASE; i < len;) x.d.push(+str.slice(i, i += LOG_BASE)); + str = str.slice(i); + i = LOG_BASE - str.length; + } else { + i -= len; + } + + for (; i--;) str += '0'; + x.d.push(+str); + + if (external && (x.e > MAX_E || x.e < -MAX_E)) throw Error(exponentOutOfRange + e); + } else { + + // Zero. + x.s = 0; + x.e = 0; + x.d = [0]; + } + + return x; +} + + +/* + * Round `x` to `sd` significant digits, using rounding mode `rm` if present (truncate otherwise). + */ + function round(x, sd, rm) { + var i, j, k, n, rd, doRound, w, xdi, + xd = x.d; + + // rd: the rounding digit, i.e. the digit after the digit that may be rounded up. + // w: the word of xd which contains the rounding digit, a base 1e7 number. + // xdi: the index of w within xd. + // n: the number of digits of w. + // i: what would be the index of rd within w if all the numbers were 7 digits long (i.e. if + // they had leading zeros) + // j: if > 0, the actual index of rd within w (if < 0, rd is a leading zero). + + // Get the length of the first word of the digits array xd. + for (n = 1, k = xd[0]; k >= 10; k /= 10) n++; + i = sd - n; + + // Is the rounding digit in the first word of xd? + if (i < 0) { + i += LOG_BASE; + j = sd; + w = xd[xdi = 0]; + } else { + xdi = Math.ceil((i + 1) / LOG_BASE); + k = xd.length; + if (xdi >= k) return x; + w = k = xd[xdi]; + + // Get the number of digits of w. + for (n = 1; k >= 10; k /= 10) n++; + + // Get the index of rd within w. + i %= LOG_BASE; + + // Get the index of rd within w, adjusted for leading zeros. + // The number of leading zeros of w is given by LOG_BASE - n. + j = i - LOG_BASE + n; + } + + if (rm !== void 0) { + k = mathpow(10, n - j - 1); + + // Get the rounding digit at index j of w. + rd = w / k % 10 | 0; + + // Are there any non-zero digits after the rounding digit? + doRound = sd < 0 || xd[xdi + 1] !== void 0 || w % k; + + // The expression `w % mathpow(10, n - j - 1)` returns all the digits of w to the right of the + // digit at (left-to-right) index j, e.g. if w is 908714 and j is 2, the expression will give + // 714. + + doRound = rm < 4 + ? (rd || doRound) && (rm == 0 || rm == (x.s < 0 ? 3 : 2)) + : rd > 5 || rd == 5 && (rm == 4 || doRound || rm == 6 && + + // Check whether the digit to the left of the rounding digit is odd. + ((i > 0 ? j > 0 ? w / mathpow(10, n - j) : 0 : xd[xdi - 1]) % 10) & 1 || + rm == (x.s < 0 ? 8 : 7)); + } + + if (sd < 1 || !xd[0]) { + if (doRound) { + k = getBase10Exponent(x); + xd.length = 1; + + // Convert sd to decimal places. + sd = sd - k - 1; + + // 1, 0.1, 0.01, 0.001, 0.0001 etc. + xd[0] = mathpow(10, (LOG_BASE - sd % LOG_BASE) % LOG_BASE); + x.e = mathfloor(-sd / LOG_BASE) || 0; + } else { + xd.length = 1; + + // Zero. + xd[0] = x.e = x.s = 0; + } + + return x; + } + + // Remove excess digits. + if (i == 0) { + xd.length = xdi; + k = 1; + xdi--; + } else { + xd.length = xdi + 1; + k = mathpow(10, LOG_BASE - i); + + // E.g. 56700 becomes 56000 if 7 is the rounding digit. + // j > 0 means i > number of leading zeros of w. + xd[xdi] = j > 0 ? (w / mathpow(10, n - j) % mathpow(10, j) | 0) * k : 0; + } + + if (doRound) { + for (;;) { + + // Is the digit to be rounded up in the first word of xd? + if (xdi == 0) { + if ((xd[0] += k) == BASE) { + xd[0] = 1; + ++x.e; + } + + break; + } else { + xd[xdi] += k; + if (xd[xdi] != BASE) break; + xd[xdi--] = 0; + k = 1; + } + } + } + + // Remove trailing zeros. + for (i = xd.length; xd[--i] === 0;) xd.pop(); + + if (external && (x.e > MAX_E || x.e < -MAX_E)) { + throw Error(exponentOutOfRange + getBase10Exponent(x)); + } + + return x; +} + + +function subtract(x, y) { + var d, e, i, j, k, len, xd, xe, xLTy, yd, + Ctor = x.constructor, + pr = Ctor.precision; + + // Return y negated if x is zero. + // Return x if y is zero and x is non-zero. + if (!x.s || !y.s) { + if (y.s) y.s = -y.s; + else y = new Ctor(x); + return external ? round(y, pr) : y; + } + + xd = x.d; + yd = y.d; + + // x and y are non-zero numbers with the same sign. + + e = y.e; + xe = x.e; + xd = xd.slice(); + k = xe - e; + + // If exponents differ... + if (k) { + xLTy = k < 0; + + if (xLTy) { + d = xd; + k = -k; + len = yd.length; + } else { + d = yd; + e = xe; + len = xd.length; + } + + // Numbers with massively different exponents would result in a very high number of zeros + // needing to be prepended, but this can be avoided while still ensuring correct rounding by + // limiting the number of zeros to `Math.ceil(pr / LOG_BASE) + 2`. + i = Math.max(Math.ceil(pr / LOG_BASE), len) + 2; + + if (k > i) { + k = i; + d.length = 1; + } + + // Prepend zeros to equalise exponents. + d.reverse(); + for (i = k; i--;) d.push(0); + d.reverse(); + + // Base 1e7 exponents equal. + } else { + + // Check digits to determine which is the bigger number. + + i = xd.length; + len = yd.length; + xLTy = i < len; + if (xLTy) len = i; + + for (i = 0; i < len; i++) { + if (xd[i] != yd[i]) { + xLTy = xd[i] < yd[i]; + break; + } + } + + k = 0; + } + + if (xLTy) { + d = xd; + xd = yd; + yd = d; + y.s = -y.s; + } + + len = xd.length; + + // Append zeros to xd if shorter. + // Don't add zeros to yd if shorter as subtraction only needs to start at yd length. + for (i = yd.length - len; i > 0; --i) xd[len++] = 0; + + // Subtract yd from xd. + for (i = yd.length; i > k;) { + if (xd[--i] < yd[i]) { + for (j = i; j && xd[--j] === 0;) xd[j] = BASE - 1; + --xd[j]; + xd[i] += BASE; + } + + xd[i] -= yd[i]; + } + + // Remove trailing zeros. + for (; xd[--len] === 0;) xd.pop(); + + // Remove leading zeros and adjust exponent accordingly. + for (; xd[0] === 0; xd.shift()) --e; + + // Zero? + if (!xd[0]) return new Ctor(0); + + y.d = xd; + y.e = e; + + //return external && xd.length >= pr / LOG_BASE ? round(y, pr) : y; + return external ? round(y, pr) : y; +} + + +function toString(x, isExp, sd) { + var k, + e = getBase10Exponent(x), + str = digitsToString(x.d), + len = str.length; + + if (isExp) { + if (sd && (k = sd - len) > 0) { + str = str.charAt(0) + '.' + str.slice(1) + getZeroString(k); + } else if (len > 1) { + str = str.charAt(0) + '.' + str.slice(1); + } + + str = str + (e < 0 ? 'e' : 'e+') + e; + } else if (e < 0) { + str = '0.' + getZeroString(-e - 1) + str; + if (sd && (k = sd - len) > 0) str += getZeroString(k); + } else if (e >= len) { + str += getZeroString(e + 1 - len); + if (sd && (k = sd - e - 1) > 0) str = str + '.' + getZeroString(k); + } else { + if ((k = e + 1) < len) str = str.slice(0, k) + '.' + str.slice(k); + if (sd && (k = sd - len) > 0) { + if (e + 1 === len) str += '.'; + str += getZeroString(k); + } + } + + return x.s < 0 ? '-' + str : str; +} + + +// Does not strip trailing zeros. +function truncate(arr, len) { + if (arr.length > len) { + arr.length = len; + return true; + } +} + + +// Decimal methods + + +/* + * clone + * config/set + */ + + +/* + * Create and return a Decimal constructor with the same configuration properties as this Decimal + * constructor. + * + */ +function clone(obj) { + var i, p, ps; + + /* + * The Decimal constructor and exported function. + * Return a new Decimal instance. + * + * value {number|string|Decimal} A numeric value. + * + */ + function Decimal(value) { + var x = this; + + // Decimal called without new. + if (!(x instanceof Decimal)) return new Decimal(value); + + // Retain a reference to this Decimal constructor, and shadow Decimal.prototype.constructor + // which points to Object. + x.constructor = Decimal; + + // Duplicate. + if (value instanceof Decimal) { + x.s = value.s; + x.e = value.e; + x.d = (value = value.d) ? value.slice() : value; + return; + } + + if (typeof value === 'number') { + + // Reject Infinity/NaN. + if (value * 0 !== 0) { + throw Error(invalidArgument + value); + } + + if (value > 0) { + x.s = 1; + } else if (value < 0) { + value = -value; + x.s = -1; + } else { + x.s = 0; + x.e = 0; + x.d = [0]; + return; + } + + // Fast path for small integers. + if (value === ~~value && value < 1e7) { + x.e = 0; + x.d = [value]; + return; + } + + return parseDecimal(x, value.toString()); + } else if (typeof value !== 'string') { + throw Error(invalidArgument + value); + } + + // Minus sign? + if (value.charCodeAt(0) === 45) { + value = value.slice(1); + x.s = -1; + } else { + x.s = 1; + } + + if (isDecimal.test(value)) parseDecimal(x, value); + else throw Error(invalidArgument + value); + } + + Decimal.prototype = P; + + Decimal.ROUND_UP = 0; + Decimal.ROUND_DOWN = 1; + Decimal.ROUND_CEIL = 2; + Decimal.ROUND_FLOOR = 3; + Decimal.ROUND_HALF_UP = 4; + Decimal.ROUND_HALF_DOWN = 5; + Decimal.ROUND_HALF_EVEN = 6; + Decimal.ROUND_HALF_CEIL = 7; + Decimal.ROUND_HALF_FLOOR = 8; + + Decimal.clone = clone; + Decimal.config = Decimal.set = config; + + if (obj === void 0) obj = {}; + if (obj) { + ps = ['precision', 'rounding', 'toExpNeg', 'toExpPos', 'LN10']; + for (i = 0; i < ps.length;) if (!obj.hasOwnProperty(p = ps[i++])) obj[p] = this[p]; + } + + Decimal.config(obj); + + return Decimal; +} + + +/* + * Configure global settings for a Decimal constructor. + * + * `obj` is an object with one or more of the following properties, + * + * precision {number} + * rounding {number} + * toExpNeg {number} + * toExpPos {number} + * + * E.g. Decimal.config({ precision: 20, rounding: 4 }) + * + */ +function config(obj) { + if (!obj || typeof obj !== 'object') { + throw Error(decimalError + 'Object expected'); + } + var i, p, v, + ps = [ + 'precision', 1, MAX_DIGITS, + 'rounding', 0, 8, + 'toExpNeg', -1 / 0, 0, + 'toExpPos', 0, 1 / 0 + ]; + + for (i = 0; i < ps.length; i += 3) { + if ((v = obj[p = ps[i]]) !== void 0) { + if (mathfloor(v) === v && v >= ps[i + 1] && v <= ps[i + 2]) this[p] = v; + else throw Error(invalidArgument + p + ': ' + v); + } + } + + if ((v = obj[p = 'LN10']) !== void 0) { + if (v == Math.LN10) this[p] = new this(v); + else throw Error(invalidArgument + p + ': ' + v); + } + + return this; +} + + +// Create and configure initial Decimal constructor. +export var Decimal = clone(defaults); + +// Internal constant. +ONE = new Decimal(1); + +export default Decimal;