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/*
* lib/decmath.js - Fast and light decimal arithmetic
*
* @licstart The following is the entire license notice for the
* JavaScript code in this file.
*
* Copyright (C) 2017 Patrick McDermott
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As additional permission under GNU GPL version 3 section 7, you
* may distribute non-source (e.g. minimized or compacted) forms of
* this program without the copy of the GNU GPL normally required by
* section 4, provided you include this license notice and a URL
* through which recipients can access the Corresponding Source.
*
* @licend The above is the entire license notice
* for the JavaScript code in this file.
*/
'use strict';
function dadd(a, b)
{
a = a.toString().split(".", 2);
b = b.toString().split(".", 2);
if (typeof a[1] == "undefined") a[1] = "";
if (typeof b[1] == "undefined") b[1] = "";
var ce;
if (a[1].length == b[1].length) {
ce = a[1].length;
} else if (a[1].length < b[1].length) {
a[1] += Array(b[1].length - a[1].length + 1).join("0");
ce = b[1].length;
} else {
b[1] += Array(a[1].length - b[1].length + 1).join("0");
ce = a[1].length;
}
var as = a[0] + a[1];
var bs = b[0] + b[1];
var cs = (parseInt(as, 10) + parseInt(bs, 10)).toString();
var pad = ce - cs.length;
if (pad > 0) cs = (Array(pad + 1).join("0") + cs).toString();
return cs.substr(0, cs.length - ce) + "." + cs.substr(cs.length - ce);
}
function dmul(a, b)
{
a = a.toString().split(".", 2);
b = b.toString().split(".", 2);
if (typeof a[1] == "undefined") a[1] = "";
if (typeof b[1] == "undefined") b[1] = "";
var as = a[0] + a[1];
var bs = b[0] + b[1];
var cs = (parseInt(as, 10) * parseInt(bs, 10)).toString();
var ce = a[1].length + b[1].length;
var pad = ce - cs.length;
if (pad > 0) cs = (Array(pad + 1).join("0") + cs).toString();
return cs.substr(0, cs.length - ce) + "." + cs.substr(cs.length - ce);
}
function drhtz(a, p)
{
a = a.toString().split(".", 2);
if (a.length == 1) return null;
var ad = a[1].substr(p);
a[1] = a[1].substr(0, p);
var as = a.join("");
if (as.charAt(0) != "-") {
if (parseInt(ad, 10) > 5 * Math.pow(10, ad.length - 1)) {
as = (parseInt(as) + 1).toString();
}
} else {
if (parseInt(ad, 10) > 5 * Math.pow(10, ad.length - 1)) {
as = (parseInt(as) - 1).toString();
}
}
var pad = p - as.length;
if (pad > 0) as = (Array(pad + 1).join("0") + as).toString();
return as.substr(0, as.length - p) + "." + as.substr(as.length - p);
}
function drhfz(a, p)
{
a = a.toString().split(".", 2);
if (a.length == 1) return null;
var ad = a[1].substr(p);
a[1] = a[1].substr(0, p);
var as = a.join("");
if (as.charAt(0) != "-") {
if (parseInt(ad, 10) >= 5 * Math.pow(10, ad.length - 1)) {
as = (parseInt(as) + 1).toString();
}
} else {
if (parseInt(ad, 10) >= 5 * Math.pow(10, ad.length - 1)) {
as = (parseInt(as) - 1).toString();
}
}
var pad = p - as.length;
if (pad > 0) as = (Array(pad + 1).join("0") + as).toString();
return as.substr(0, as.length - p) + "." + as.substr(as.length - p);
}
if (typeof global != "undefined") {
global.dadd = dadd;
global.dmul = dmul;
global.drhtz = drhtz;
global.drhfz = drhfz;
}
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