satie
Version:
A sheet music renderer for the web
58 lines (57 loc) • 1.85 kB
JavaScript
/**
* This file is part of Satie music engraver <https://github.com/jnetterf/satie>.
* Copyright (C) Joshua Netterfield <joshua.ca> 2015 - present.
*
* Satie is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* Satie is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Satie. If not, see <http://www.gnu.org/licenses/>.
*/
;
/**
* @file private/util.ts Math and other utilites used privately by the engine.
*/
var invariant = require("invariant");
/**
* Finds the positive greatest common factor of two numbers by using Euclid's algorithm.
*/
function gcd(a, b) {
var t;
while (b !== 0) {
t = b;
b = a % b;
a = t;
}
return Math.abs(a);
}
exports.gcd = gcd;
/**
* Calculates modified lcm. This functions handles zero and negatives.
*/
function lcm(a, b) {
invariant(isFinite(a), "%s is not finite", a);
invariant(isFinite(b), "%s is not finite", b);
a = Math.abs(a);
b = Math.abs(b);
return Math.max(a, b, a * b / gcd(a, b) || 0);
}
exports.lcm = lcm;
/**
* Very efficient way of cloning a plain JavaScript object (i.e., one without prototypes, getters, or setters)
*/
function cloneObject(obj) {
if (obj === undefined || obj === null) {
return obj;
}
return JSON.parse(JSON.stringify(obj));
}
exports.cloneObject = cloneObject;
exports.MAX_SAFE_INTEGER = 9007199254740991;