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Initial addition of bitwise functions; will add tests soon.

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Favian Contreras 2014-11-24 04:42:38 -08:00
parent 6ece3c863e
commit f7cee42cba
1 changed files with 193 additions and 1 deletions
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194
decimal.js
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@ -66,6 +66,36 @@
};
/*
* n & n = n
* n & 0 = 0
* N & n = N
* I & n = n
* I & I = I
* I & -I = 0
* -I & n = 0
* -I & -I = -I
*
* Return a new Decimal whose value is the value of this Decimal & Decimal(n).
*
*/
P['and'] = function (n) {
var Decimal = this['constructor'],
n = new Decimal(n);
if (this && n && (!this['c'] || !n['c'])) {
if (!this['c'] && !n['c']) {
return new Decimal((this['s'] == n['s']) ? this : 0);
}
if (this['s'] < 0 || n['s'] < 0) {
return new Decimal(0);
}
return new Decimal(this['c'] ? c['trunc']() : n['trunc']());
}
return bitwise(this, n, function (a, b) { return a & b });
};
/*
* Return a new Decimal whose value is the value of this Decimal rounded to a whole number in
* the direction of positive Infinity.
@ -321,6 +351,25 @@
};
/*
* Return a new Decimal whose value is this Decimal << n, rounded to precision
* significant digits using rounding mode rounding.
*
*/
P['leftShift'] = function (n) {
var Decimal = this['constructor'],
n = new Decimal(n);
if (n['s'] < 0) {
return new Decimal(NaN);
}
if (n['isZero']()) {
return new Decimal(this);
}
return this['trunc']()['times'](new Decimal(2)['pow'](n));
};
/*
* Return true if the value of this Decimal is less than Decimal(n, b), otherwise return false.
*
@ -758,6 +807,46 @@
};
/*
* Return a new Decimal whose value is the value of ~(this Decimal).
* The final digit adjustment may get lost out the precision bound.
*
*/
P['not'] = function () {
var x = new this['constructor'](this['trunc']());
x = x['plus'](x['constructor']['ONE']);
x['s'] = -x['s'] || null;
return x;
};
/*
* n | 0 = n
* n | n = n
* I | n = I
* I | I = I
* -I | n = -I
* -I | -I = -I
* -I | I = -1
*
* Return a new Decimal whose value is the value of this Decimal | Decimal(n).
*
*/
P['or'] = function (n) {
var Decimal = this['constructor'],
n = new Decimal(n);
if (this && n && (!this['c'] || !n['c'])) {
if (!this['c'] && !n['c']) {
return new Decimal(-1);
}
return new Decimal(this['c'] ? n : this);
}
return bitwise(this, n, function (a, b) { return a | b });
};
/*
* n + 0 = n
* n + N = N
@ -918,6 +1007,25 @@
};
/*
* Return a new Decimal whose value is this Decimal >> n, rounded to precision
* significant digits using rounding mode rounding.
*
*/
P['rightShift'] = function (n) {
var Decimal = this['constructor'],
n = new Decimal(n);
if (n['s'] < 0) {
return new Decimal(NaN);
}
if (n['isZero']()) {
return new Decimal(this);
}
return this['trunc']()['divToInt'](new Decimal(2)['pow'](n));
};
/*
* Return a new Decimal whose value is the value of this Decimal rounded to a whole number using
* rounding mode rounding.
@ -1838,6 +1946,31 @@
};
/*
* n ^ n = 0
* n ^ 0 = n
* N ^ n = N
* I ^ -I = -1
* I ^ n = I
* -I ^ n = -I
*
* Return a new Decimal whose value is the value of this Decimal ^ Decimal(n).
*
*/
P['xor'] = function (n) {
var Decimal = this['constructor'],
n = new Decimal(n);
if (this && n && (!this['c'] || !n['c'])) {
if (!this['c'] && !n['c']) {
return new Decimal((this['s'] == n['s']) ? 0 : -1);
}
return new Decimal(this['c'] ? n : this);
}
return bitwise(this, n, function (a, b) { return a ^ b });
};
/*
// Add aliases to match BigDecimal method names.
P['add'] = P['plus'];
@ -1854,6 +1987,7 @@
/*
* bitwise
* coefficientToString
* checkRoundingDigits
* checkRM
@ -1870,6 +2004,61 @@
*/
String.prototype.padLeft = function(padString, length) {
var str = this;
while (str.length < length) {
str = padString + str;
}
return str;
}
function bitwise(x, y, func) {
var Decimal = x['constructor'];
// Either NaN?
if (!x['s'] || !y['s']) {
return new Decimal(NaN);
}
var x_bits, y_bits, tmp_external = external;
external = false;
if (x['s'] < 0) {
x_bits = '1' + x['not']()['toString'](2).replace(/[01]/g, function (d) { return +!+d });
} else {
x_bits = '0' + x['trunc']()['toString'](2);
}
if (y['s'] < 0) {
y_bits = '1' + y['not']()['toString'](2).replace(/[01]/g, function (d) { return +!+d });
} else {
y_bits = '0' + y['trunc']()['toString'](2);
}
external = tmp_external;
if (x_bits.length > y_bits.length) {
y_bits = y_bits.padLeft((y['s'] < 0) ? '1' : '0', x_bits.length);
} else if (x_bits.length < y_bits.length) {
x_bits = x_bits.padLeft((x['s'] < 0) ? '1' : '0', y_bits.length);
}
var out_str = "";
for (var i = 0; i < x_bits.length; ++i) {
out_str += "" + func(x_bits[i], y_bits[i]);
}
if (out_str[0] == '0') {
return new Decimal(out_str, 2);
}
var comp_str = "";
for (var i = 1; i < out_str.length; ++i) {
comp_str += (out_str[i] == '0') ? '1' : '0';
}
return new Decimal(comp_str, 2)['plus'](Decimal['ONE'])['neg']();
}
function coefficientToString(a) {
var s, z,
i = 1,
@ -2063,9 +2252,12 @@
// Convert the number as integer.
xc = toBaseOut( str, baseIn, baseOut );
e = j = xc.length;
if (i < 0 && baseOut == 2 && !external) {
return xc.join('');
}
// Remove trailing zeros.
e = j = xc.length;
for ( ; xc[--j] == 0; xc.pop() );
if ( !xc[0] ) {