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Add Decimal.isDecimal and config reset

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This commit is contained in:
Michael Mclaughlin
2017-12-09 22:05:28 +00:00
parent 17a358f2f4
commit fd668fea70
7 changed files with 191 additions and 35 deletions
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33
decimal.js
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@@ -34,7 +34,7 @@
// The initial configuration properties of the Decimal constructor.
Decimal = {
DEFAULTS = {
// These values must be integers within the stated ranges (inclusive).
// Most of these values can be changed at run-time using the `Decimal.config` method.
@@ -99,7 +99,7 @@
// ----------------------------------- END OF EDITABLE DEFAULTS ------------------------------- //
inexact, noConflict, quadrant,
Decimal, inexact, noConflict, quadrant,
external = true,
decimalError = '[DecimalError] ',
@@ -123,7 +123,7 @@
PI_PRECISION = PI.length - 1,
// Decimal.prototype object
P = {};
P = { name: '[object Decimal]' };
// Decimal prototype methods
@@ -4160,6 +4160,7 @@
* minE {number}
* modulo {number}
* crypto {boolean|number}
* defaults {true}
*
* E.g. Decimal.config({ precision: 20, rounding: 4 })
*
@@ -4167,6 +4168,7 @@
function config(obj) {
if (!obj || typeof obj !== 'object') throw Error(decimalError + 'Object expected');
var i, p, v,
useDefaults = obj.defaults === true,
ps = [
'precision', 1, MAX_DIGITS,
'rounding', 0, 8,
@@ -4178,13 +4180,15 @@
];
for (i = 0; i < ps.length; i += 3) {
if ((v = obj[p = ps[i]]) !== void 0) {
if (p = ps[i], useDefaults) this[p] = DEFAULTS[p];
if ((v = obj[p]) !== 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 = 'crypto']) !== void 0) {
if (p = 'crypto', useDefaults) this[p] = DEFAULTS[p];
if ((v = obj[p]) !== void 0) {
if (v === true || v === false || v === 0 || v === 1) {
if (v) {
if (typeof crypto != 'undefined' && crypto &&
@@ -4327,6 +4331,7 @@
Decimal.config = Decimal.set = config;
Decimal.clone = clone;
Decimal.isDecimal = isDecimalInstance;
Decimal.abs = abs;
Decimal.acos = acos;
@@ -4367,8 +4372,10 @@
if (obj === void 0) obj = {};
if (obj) {
ps = ['precision', 'rounding', 'toExpNeg', 'toExpPos', 'maxE', 'minE', 'modulo', 'crypto'];
for (i = 0; i < ps.length;) if (!obj.hasOwnProperty(p = ps[i++])) obj[p] = this[p];
if (obj.defaults !== true) {
ps = ['precision', 'rounding', 'toExpNeg', 'toExpPos', 'maxE', 'minE', 'modulo', 'crypto'];
for (i = 0; i < ps.length;) if (!obj.hasOwnProperty(p = ps[i++])) obj[p] = this[p];
}
}
Decimal.config(obj);
@@ -4445,6 +4452,16 @@
}
/*
* Return true if object is a Decimal instance (where Decimal is any Decimal constructor),
* otherwise return false.
*
*/
function isDecimalInstance(obj) {
return obj instanceof Decimal || obj && obj.name === '[object Decimal]' || false;
}
/*
* Return a new Decimal whose value is the natural logarithm of `x`, rounded to `precision`
* significant digits using rounding mode `rounding`.
@@ -4775,7 +4792,7 @@
// Create and configure initial Decimal constructor.
Decimal = clone(Decimal);
Decimal = clone(DEFAULTS);
Decimal['default'] = Decimal.Decimal = Decimal;