Convert @[BigDigit] to ~[BigDigit]

This commit is contained in:
gifnksm 2012-12-22 14:35:35 +09:00
parent 54b548795f
commit 68c689f1ca

View File

@ -59,7 +59,7 @@ A BigUint-typed value BigUint { data: @[a, b, c] } represents a number
(a + b * BigDigit::base + c * BigDigit::base^2).
*/
pub struct BigUint {
priv data: @[BigDigit]
priv data: ~[BigDigit]
}
impl BigUint : Eq {
@ -101,11 +101,11 @@ impl BigUint : Shr<uint, BigUint> {
}
impl BigUint : Zero {
static pure fn zero() -> BigUint { BigUint::from_at_vec(@[]) }
static pure fn zero() -> BigUint { BigUint::new(~[]) }
}
impl BigUint : One {
static pub pure fn one() -> BigUint { BigUint::from_at_vec(@[1]) }
static pub pure fn one() -> BigUint { BigUint::new(~[1]) }
}
impl BigUint : Num {
@ -113,7 +113,7 @@ impl BigUint : Num {
let new_len = uint::max(self.data.len(), other.data.len());
let mut carry = 0;
let sum = do at_vec::from_fn(new_len) |i| {
let sum = do vec::from_fn(new_len) |i| {
let ai = if i < self.data.len() { self.data[i] } else { 0 };
let bi = if i < other.data.len() { other.data[i] } else { 0 };
let (hi, lo) = BigDigit::from_uint(
@ -122,15 +122,15 @@ impl BigUint : Num {
carry = hi;
lo
};
if carry == 0 { return BigUint::from_at_vec(sum) };
return BigUint::from_at_vec(sum + [carry]);
if carry == 0 { return BigUint::new(sum) };
return BigUint::new(sum + [carry]);
}
pure fn sub(&self, other: &BigUint) -> BigUint {
let new_len = uint::max(self.data.len(), other.data.len());
let mut borrow = 0;
let diff = do at_vec::from_fn(new_len) |i| {
let diff = do vec::from_fn(new_len) |i| {
let ai = if i < self.data.len() { self.data[i] } else { 0 };
let bi = if i < other.data.len() { other.data[i] } else { 0 };
let (hi, lo) = BigDigit::from_uint(
@ -146,7 +146,7 @@ impl BigUint : Num {
};
assert borrow == 0; // <=> assert (self >= other);
return BigUint::from_at_vec(diff);
return BigUint::new(diff);
}
pure fn mul(&self, other: &BigUint) -> BigUint {
@ -167,28 +167,34 @@ impl BigUint : Num {
let ll = sLo * oLo;
let hh = sHi * oHi;
let mm = match (sub_sign(sHi, sLo), sub_sign(oHi, oLo)) {
((s1, n1), (s2, n2)) if s1 * s2 < 0 => hh + ll + (n1 * n2),
((s1, n1), (s2, n2)) if s1 * s2 > 0 => hh + ll - (n1 * n2),
_ => hh + ll,
let mm = {
let (s1, n1) = sub_sign(sHi, sLo);
let (s2, n2) = sub_sign(oHi, oLo);
if s1 * s2 < 0 {
hh + ll + (n1 * n2)
} else if s1 * s2 > 0 {
hh + ll - (n1 * n2)
} else {
hh + ll
}
};
return ll + mm.shl_unit(half_len) + hh.shl_unit(half_len * 2);
pure fn mul_digit(a: &BigUint, n: BigDigit) -> BigUint {
if n == 0 { return Zero::zero(); }
if n == 1 { return *a; }
if n == 1 { return copy *a; }
let mut carry = 0;
let prod = do at_vec::map(a.data) |ai| {
let prod = do vec::map(a.data) |ai| {
let (hi, lo) = BigDigit::from_uint(
(*ai as uint) * (n as uint) + (carry as uint)
);
carry = hi;
lo
};
if carry == 0 { return BigUint::from_at_vec(prod) };
return BigUint::from_at_vec(prod + [carry]);
if carry == 0 { return BigUint::new(prod) };
return BigUint::new(prod + [carry]);
}
pure fn cut_at(a: &BigUint, n: uint) -> (BigUint, BigUint) {
@ -206,11 +212,13 @@ impl BigUint : Num {
}
}
pure fn div(&self, other: &BigUint) -> BigUint{
self.divmod(other).first()
pure fn div(&self, other: &BigUint) -> BigUint {
let (d, _) = self.divmod(other);
return d;
}
pure fn modulo(&self, other: &BigUint) -> BigUint {
self.divmod(other).second()
let (_, m) = self.divmod(other);
return m;
}
pure fn neg(&self) -> BigUint { fail }
@ -225,32 +233,29 @@ impl BigUint : Num {
}
pub impl BigUint {
/// Creates and initializes an BigUint.
static pub pure fn new(v: ~[BigDigit]) -> BigUint {
// omit trailing zeros
let new_len = v.rposition(|n| *n != 0).map_default(0, |p| *p + 1);
if new_len == v.len() { return BigUint { data: v }; }
let mut v = v;
unsafe { v.truncate(new_len); }
return BigUint { data: v };
}
/// Creates and initializes an BigUint.
static pub pure fn from_uint(n: uint) -> BigUint {
match BigDigit::from_uint(n) {
(0, 0) => Zero::zero(),
(0, n0) => BigUint::from_at_vec(@[n0]),
(n1, n0) => BigUint::from_at_vec(@[n0, n1])
(0, n0) => BigUint::new(~[n0]),
(n1, n0) => BigUint::new(~[n0, n1])
}
}
/// Creates and initializes an BigUint.
static pub pure fn from_slice(slice: &[BigDigit]) -> BigUint {
// omit trailing zeros
let new_len = slice.rposition(|n| *n != 0)
.map_default(0, |p| *p + 1);
return BigUint { data: at_vec::from_fn(new_len, |i| slice[i]) };
}
/// Creates and initializes an BigUint.
static pub pure fn from_at_vec(at_vec: @[BigDigit]) -> BigUint {
// omit trailing zeros
let new_len = at_vec.rposition(|n| *n != 0)
.map_default(0, |p| *p + 1);
if new_len == at_vec.len() { return BigUint { data: at_vec }; }
return BigUint { data: at_vec::from_fn(new_len, |i| at_vec[i]) };
return BigUint::new(vec::from_slice(slice));
}
/// Creates and initializes an BigUint.
@ -282,7 +287,7 @@ pub impl BigUint {
}
}
pure fn abs(&self) -> BigUint { *self }
pure fn abs(&self) -> BigUint { copy *self }
/// Compare two BigUint value.
pure fn cmp(&self, other: &BigUint) -> int {
@ -303,10 +308,10 @@ pub impl BigUint {
pure fn divmod(&self, other: &BigUint) -> (BigUint, BigUint) {
if other.is_zero() { fail }
if self.is_zero() { return (Zero::zero(), Zero::zero()); }
if *other == One::one() { return (*self, Zero::zero()); }
if *other == One::one() { return (copy *self, Zero::zero()); }
match self.cmp(other) {
s if s < 0 => return (Zero::zero(), *self),
s if s < 0 => return (Zero::zero(), copy *self),
0 => return (One::one(), Zero::zero()),
_ => {} // Do nothing
}
@ -321,13 +326,12 @@ pub impl BigUint {
let (d, m) = divmod_inner(self << shift, other << shift);
return (d, m >> shift);
pure fn divmod_inner(a: BigUint, b: BigUint) -> (BigUint, BigUint) {
let mut r = a;
let mut d = Zero::zero::<BigUint>();
let mut n = 1;
while r >= b {
let mut (d0, d_unit, b_unit) = div_estimate(r, b, n);
let mut (d0, d_unit, b_unit) = div_estimate(&r, &b, n);
let mut prod = b * d0;
while prod > r {
d0 -= d_unit;
@ -344,10 +348,10 @@ pub impl BigUint {
return (d, r);
}
pure fn div_estimate(a: BigUint, b: BigUint, n: uint)
pure fn div_estimate(a: &BigUint, b: &BigUint, n: uint)
-> (BigUint, BigUint, BigUint) {
if a.data.len() < n {
return (Zero::zero(), Zero::zero(), a);
return (Zero::zero(), Zero::zero(), copy *a);
}
let an = vec::view(a.data, a.data.len() - n, a.data.len());
@ -363,6 +367,9 @@ pub impl BigUint {
}
let shift = (a.data.len() - an.len()) - (b.data.len() - 1);
if shift == 0 {
return (BigUint::new(d), One::one(), copy *b);
}
return (BigUint::from_slice(d).shl_unit(shift),
One::one::<BigUint>().shl_unit(shift),
b.shl_unit(shift));
@ -370,10 +377,12 @@ pub impl BigUint {
}
pure fn quot(&self, other: &BigUint) -> BigUint {
self.quotrem(other).first()
let (q, _) = self.quotrem(other);
return q;
}
pure fn rem(&self, other: &BigUint) -> BigUint {
self.quotrem(other).second()
let (_, r) = self.quotrem(other);
return r;
}
pure fn quotrem(&self, other: &BigUint) -> (BigUint, BigUint) {
self.divmod(other)
@ -397,12 +406,16 @@ pub impl BigUint {
pure fn to_str_radix(&self, radix: uint) -> ~str {
assert 1 < radix && radix <= 16;
let (base, max_len) = get_radix_base(radix);
if base == BigDigit::base {
return fill_concat(self.data, radix, max_len)
}
return fill_concat(convert_base(copy *self, base), radix, max_len);
pure fn convert_base(n: &BigUint, base: uint) -> @[BigDigit] {
if base == BigDigit::base { return n.data; }
pure fn convert_base(n: BigUint, base: uint) -> ~[BigDigit] {
let divider = BigUint::from_uint(base);
let mut result = @[];
let mut r = *n;
let mut result = ~[];
let mut r = n;
while r > divider {
let (d, r0) = r.divmod(&divider);
result += [r0.to_uint() as BigDigit];
@ -421,52 +434,47 @@ pub impl BigUint {
str::from_chars(vec::from_elem(l - s.len(), '0')) + s
})), ['0'])
}
let (base, max_len) = get_radix_base(radix);
return fill_concat(convert_base(self, base), radix, max_len);
}
priv pure fn shl_unit(&self, n_unit: uint) -> BigUint {
if n_unit == 0 || self.is_zero() { return *self; }
priv pure fn shl_unit(self, n_unit: uint) -> BigUint {
if n_unit == 0 || self.is_zero() { return self; }
return BigUint::from_at_vec(at_vec::from_elem(n_unit, 0) + self.data);
return BigUint::new(vec::from_elem(n_unit, 0) + self.data);
}
priv pure fn shl_bits(&self, n_bits: uint) -> BigUint {
if n_bits == 0 || self.is_zero() { return *self; }
priv pure fn shl_bits(self, n_bits: uint) -> BigUint {
if n_bits == 0 || self.is_zero() { return self; }
let mut carry = 0;
let shifted = do at_vec::map(self.data) |elem| {
let shifted = do vec::map(self.data) |elem| {
let (hi, lo) = BigDigit::from_uint(
(*elem as uint) << n_bits | (carry as uint)
);
carry = hi;
lo
};
if carry == 0 { return BigUint::from_at_vec(shifted); }
return BigUint::from_at_vec(shifted + [carry]);
if carry == 0 { return BigUint::new(shifted); }
return BigUint::new(shifted + [carry]);
}
priv pure fn shr_unit(&self, n_unit: uint) -> BigUint {
if n_unit == 0 { return *self; }
priv pure fn shr_unit(self, n_unit: uint) -> BigUint {
if n_unit == 0 { return self; }
if self.data.len() < n_unit { return Zero::zero(); }
return BigUint::from_slice(
vec::view(self.data, n_unit, self.data.len())
);
}
priv pure fn shr_bits(&self, n_bits: uint) -> BigUint {
if n_bits == 0 || self.data.is_empty() { return *self; }
priv pure fn shr_bits(self, n_bits: uint) -> BigUint {
if n_bits == 0 || self.data.is_empty() { return self; }
let mut borrow = 0;
let mut shifted = @[];
let mut shifted = ~[];
for vec::rev_each(self.data) |elem| {
// internal compiler error: no enclosing scope with id 10671
// shifted = @[(*elem >> n_bits) | borrow] + shifted;
shifted = at_vec::append(@[(*elem >> n_bits) | borrow], shifted);
shifted = ~[(*elem >> n_bits) | borrow] + shifted;
borrow = *elem << (uint::bits - n_bits);
}
return BigUint::from_at_vec(shifted);
return BigUint::new(shifted);
}
}
@ -582,8 +590,8 @@ impl BigInt : One {
impl BigInt : Num {
pure fn add(&self, other: &BigInt) -> BigInt {
match (self.sign, other.sign) {
(Zero, _) => *other,
(_, Zero) => *self,
(Zero, _) => copy *other,
(_, Zero) => copy *self,
(Plus, Plus) => BigInt::from_biguint(Plus,
self.data + other.data),
(Plus, Minus) => self - (-*other),
@ -594,7 +602,7 @@ impl BigInt : Num {
pure fn sub(&self, other: &BigInt) -> BigInt {
match (self.sign, other.sign) {
(Zero, _) => -other,
(_, Zero) => *self,
(_, Zero) => copy *self,
(Plus, Plus) => match self.data.cmp(&other.data) {
s if s < 0 =>
BigInt::from_biguint(Minus, other.data - self.data),
@ -620,13 +628,15 @@ impl BigInt : Num {
}
}
pure fn div(&self, other: &BigInt) -> BigInt {
self.divmod(other).first()
let (d, _) = self.divmod(other);
return d;
}
pure fn modulo(&self, other: &BigInt) -> BigInt {
self.divmod(other).second()
let (_, m) = self.divmod(other);
return m;
}
pure fn neg(&self) -> BigInt {
BigInt::from_biguint(self.sign.neg(), self.data)
BigInt::from_biguint(self.sign.neg(), copy self.data)
}
pure fn to_int(&self) -> int {
@ -652,6 +662,11 @@ impl BigInt : Num {
}
pub impl BigInt {
/// Creates and initializes an BigInt.
static pub pure fn new(sign: Sign, v: ~[BigDigit]) -> BigInt {
BigInt::from_biguint(sign, BigUint::new(v))
}
/// Creates and initializes an BigInt.
static pub pure fn from_biguint(sign: Sign, data: BigUint) -> BigInt {
if sign == Zero || data.is_zero() {
@ -671,12 +686,6 @@ pub impl BigInt {
BigInt::from_biguint(sign, BigUint::from_slice(slice))
}
/// Creates and initializes an BigInt.
static pub pure fn from_at_vec(sign: Sign, at_vec: @[BigDigit])
-> BigInt {
BigInt::from_biguint(sign, BigUint::from_at_vec(at_vec))
}
/// Creates and initializes an BigInt.
static pub pure fn from_str_radix(s: &str, radix: uint)
-> Option<BigInt> {
@ -697,7 +706,9 @@ pub impl BigInt {
.map(|bu| BigInt::from_biguint(sign, *bu));
}
pure fn abs(&self) -> BigInt { BigInt::from_biguint(Plus, self.data) }
pure fn abs(&self) -> BigInt {
BigInt::from_biguint(Plus, copy self.data)
}
pure fn cmp(&self, other: &BigInt) -> int {
let ss = self.sign, os = other.sign;
@ -735,10 +746,12 @@ pub impl BigInt {
}
pure fn quot(&self, other: &BigInt) -> BigInt {
self.quotrem(other).first()
let (q, _) = self.quotrem(other);
return q;
}
pure fn rem(&self, other: &BigInt) -> BigInt {
self.quotrem(other).second()
let (_, r) = self.quotrem(other);
return r;
}
pure fn quotrem(&self, other: &BigInt) -> (BigInt, BigInt) {
@ -783,16 +796,15 @@ pub impl BigInt {
mod biguint_tests {
#[test]
fn test_from_slice() {
let pairs = [
(&[1], &[1]),
(&[0, 0], &[]),
(&[1, 2, 0, 0], &[1, 2]),
(&[0, 0, 1, 2, 0, 0], &[0, 0, 1, 2]),
(&[-1], &[-1])
];
for pairs.each |p| {
assert p.second() == BigUint::from_slice(p.first()).data;
fn check(slice: &[BigDigit], data: &[BigDigit]) {
assert data == BigUint::from_slice(slice).data;
}
check(~[1], ~[1]);
check(~[0, 0, 0], ~[]);
check(~[1, 2, 0, 0], ~[1, 2]);
check(~[0, 0, 1, 2], ~[0, 0, 1, 2]);
check(~[0, 0, 1, 2, 0, 0], ~[0, 0, 1, 2]);
check(~[-1], ~[-1]);
}
#[test]
@ -834,99 +846,76 @@ mod biguint_tests {
#[test]
fn test_shl() {
assert BigUint::from_at_vec(@[]) << 3 == BigUint::from_at_vec(@[]);
assert BigUint::from_at_vec(@[1, 1, 1]) << 3 ==
BigUint::from_at_vec(@[1 << 3, 1 << 3, 1 << 3]);
fn check(v: ~[BigDigit], shift: uint, ans: ~[BigDigit]) {
assert BigUint::new(v) << shift == BigUint::new(ans);
}
assert BigUint::from_at_vec(@[1 << (BigDigit::bits - 2)]) << 2 ==
BigUint::from_at_vec(@[0, 1]);
assert BigUint::from_at_vec(@[1 << (BigDigit::bits - 2)]) << 3 ==
BigUint::from_at_vec(@[0, 2]);
assert (BigUint::from_at_vec(@[1 << (BigDigit::bits - 2)])
<< (3 + BigDigit::bits)) ==
BigUint::from_at_vec(@[0, 0, 2]);
assert BigUint::from_at_vec(
@[0x7654_3210, 0xfedc_ba98, 0x7654_3210, 0xfedc_ba98]
) << 4 == BigUint::from_at_vec(
@[0x6543_2100, 0xedcb_a987, 0x6543_210f, 0xedcb_a987, 0xf]
);
assert BigUint::from_at_vec(
@[0x2222_1111, 0x4444_3333, 0x6666_5555, 0x8888_7777]
) << 16 == BigUint::from_at_vec(
@[0x1111_0000, 0x3333_2222, 0x5555_4444, 0x7777_6666, 0x8888]
);
check(~[], 3, ~[]);
check(~[1, 1, 1], 3, ~[1 << 3, 1 << 3, 1 << 3]);
check(~[1 << (BigDigit::bits - 2)], 2, ~[0, 1]);
check(~[1 << (BigDigit::bits - 2)], 3, ~[0, 2]);
check(~[1 << (BigDigit::bits - 2)], 3 + BigDigit::bits, ~[0, 0, 2]);
check(~[0x7654_3210, 0xfedc_ba98, 0x7654_3210, 0xfedc_ba98], 4,
~[0x6543_2100, 0xedcb_a987, 0x6543_210f, 0xedcb_a987, 0xf]);
check(~[0x2222_1111, 0x4444_3333, 0x6666_5555, 0x8888_7777], 16,
~[0x1111_0000, 0x3333_2222, 0x5555_4444, 0x7777_6666, 0x8888]);
}
#[test]
fn test_shr() {
assert BigUint::from_at_vec(@[]) >> 3 == BigUint::from_at_vec(@[]);
assert BigUint::from_at_vec(@[1, 1, 1]) >> 3 == BigUint::from_at_vec(
@[1 << (BigDigit::bits - 3), 1 << (BigDigit::bits - 3)]
);
fn check(v: ~[BigDigit], shift: uint, ans: ~[BigDigit]) {
assert BigUint::new(v) >> shift == BigUint::new(ans);
}
assert BigUint::from_at_vec(@[1 << 2]) >> 2 ==
BigUint::from_at_vec(@[1]);
assert BigUint::from_at_vec(@[1, 2]) >> 3 ==
BigUint::from_at_vec(@[1 << (BigDigit::bits - 2)]);
assert BigUint::from_at_vec(@[1, 1, 2]) >> (3 + BigDigit::bits) ==
BigUint::from_at_vec(@[1 << (BigDigit::bits - 2)]);
assert BigUint::from_at_vec(
@[0x6543_2100, 0xedcb_a987, 0x6543_210f, 0xedcb_a987, 0xf]
) >> 4 == BigUint::from_at_vec(
@[0x7654_3210, 0xfedc_ba98, 0x7654_3210, 0xfedc_ba98]
);
assert BigUint::from_at_vec(
@[0x1111_0000, 0x3333_2222, 0x5555_4444, 0x7777_6666, 0x8888]
) >> 16 == BigUint::from_at_vec(
@[0x2222_1111, 0x4444_3333, 0x6666_5555, 0x8888_7777]
);
check(~[], 3, ~[]);
check(~[1, 1, 1], 3,
~[1 << (BigDigit::bits - 3), 1 << (BigDigit::bits - 3)]);
check(~[1 << 2], 2, ~[1]);
check(~[1, 2], 3, ~[1 << (BigDigit::bits - 2)]);
check(~[1, 1, 2], 3 + BigDigit::bits, ~[1 << (BigDigit::bits - 2)]);
check(~[0x6543_2100, 0xedcb_a987, 0x6543_210f, 0xedcb_a987, 0xf], 4,
~[0x7654_3210, 0xfedc_ba98, 0x7654_3210, 0xfedc_ba98]);
check(~[0x1111_0000, 0x3333_2222, 0x5555_4444, 0x7777_6666, 0x8888],
16,
~[0x2222_1111, 0x4444_3333, 0x6666_5555, 0x8888_7777]);
}
#[test]
fn test_convert_int() {
fn check_conv(b: BigUint, i: int) {
fn check(v: ~[BigDigit], i: int) {
let b = BigUint::new(v);
assert b == Num::from_int(i);
assert b.to_int() == i;
}
check_conv(Zero::zero(), 0);
check_conv(BigUint::from_at_vec(@[1]), 1);
check(~[], 0);
check(~[1], 1);
check(~[-1], (uint::max_value >> BigDigit::bits) as int);
check(~[ 0, 1], ((uint::max_value >> BigDigit::bits) + 1) as int);
check(~[-1, -1 >> 1], int::max_value);
check_conv(BigUint::from_at_vec(@[-1]),
(uint::max_value >> BigDigit::bits) as int);
check_conv(BigUint::from_at_vec(@[ 0, 1]),
((uint::max_value >> BigDigit::bits) + 1) as int);
check_conv(BigUint::from_at_vec(@[-1, -1 >> 1]),
int::max_value);
assert BigUint::from_at_vec(@[0, -1]).to_int() == int::max_value;
assert BigUint::from_at_vec(@[0, 0, 1]).to_int() == int::max_value;
assert BigUint::from_at_vec(@[0, 0, -1]).to_int() == int::max_value;
assert BigUint::new(~[0, -1]).to_int() == int::max_value;
assert BigUint::new(~[0, 0, 1]).to_int() == int::max_value;
assert BigUint::new(~[0, 0, -1]).to_int() == int::max_value;
}
#[test]
fn test_convert_uint() {
fn check_conv(b: BigUint, u: uint) {
fn check(v: ~[BigDigit], u: uint) {
let b = BigUint::new(v);
assert b == BigUint::from_uint(u);
assert b.to_uint() == u;
}
check_conv(Zero::zero(), 0);
check_conv(BigUint::from_at_vec(@[ 1]), 1);
check_conv(BigUint::from_at_vec(@[-1]),
uint::max_value >> BigDigit::bits);
check_conv(BigUint::from_at_vec(@[ 0, 1]),
(uint::max_value >> BigDigit::bits) + 1);
check_conv(BigUint::from_at_vec(@[ 0, -1]),
uint::max_value << BigDigit::bits);
check_conv(BigUint::from_at_vec(@[-1, -1]),
uint::max_value);
check(~[], 0);
check(~[ 1], 1);
check(~[-1], uint::max_value >> BigDigit::bits);
check(~[ 0, 1], (uint::max_value >> BigDigit::bits) + 1);
check(~[ 0, -1], uint::max_value << BigDigit::bits);
check(~[-1, -1], uint::max_value);
assert BigUint::from_at_vec(@[0, 0, 1]).to_uint() == uint::max_value;
assert BigUint::from_at_vec(@[0, 0, -1]).to_uint() == uint::max_value;
assert BigUint::new(~[0, 0, 1]).to_uint() == uint::max_value;
assert BigUint::new(~[0, 0, -1]).to_uint() == uint::max_value;
}
const sum_triples: &[(&[BigDigit], &[BigDigit], &[BigDigit])] = &[
@ -1127,12 +1116,18 @@ mod biguint_tests {
return f;
}
assert factor(3) == BigUint::from_str_radix(~"6", 10).get();
assert factor(10) == BigUint::from_str_radix(~"3628800", 10).get();
assert factor(20) == BigUint::from_str_radix(
~"2432902008176640000", 10).get();
assert factor(30) == BigUint::from_str_radix(
~"265252859812191058636308480000000", 10).get();
fn check(n: uint, s: &str) {
let n = factor(n);
let ans = match BigUint::from_str_radix(s, 10) {
Some(x) => x, None => fail
};
assert n == ans;
}
check(3, "6");
check(10, "3628800");
check(20, "2432902008176640000");
check(30, "265252859812191058636308480000000");
}
}
@ -1140,24 +1135,24 @@ mod biguint_tests {
mod bigint_tests {
#[test]
fn test_from_biguint() {
assert BigInt::from_biguint(Plus, BigUint::from_uint(1)) ==
BigInt { sign: Plus, data: BigUint::from_uint(1) };
assert BigInt::from_biguint(Plus, Zero::zero()) ==
BigInt { sign: Zero, data: Zero::zero() };
assert BigInt::from_biguint(Minus, BigUint::from_uint(1)) ==
BigInt { sign: Minus, data: BigUint::from_uint(1) };
assert BigInt::from_biguint(Zero, BigUint::from_uint(1)) ==
BigInt { sign: Zero, data: Zero::zero() };
fn check(inp_s: Sign, inp_n: uint, ans_s: Sign, ans_n: uint) {
let inp = BigInt::from_biguint(inp_s, BigUint::from_uint(inp_n));
let ans = BigInt { sign: ans_s, data: BigUint::from_uint(ans_n)};
assert inp == ans;
}
check(Plus, 1, Plus, 1);
check(Plus, 0, Zero, 0);
check(Minus, 1, Minus, 1);
check(Zero, 1, Zero, 0);
}
#[test]
fn test_cmp() {
let uints = [ &[2], &[1, 1], &[2, 1], &[1, 1, 1] ]
.map(|data| BigUint::from_slice(*data));
let nums: ~[BigInt]
= vec::reversed(uints).map(|bu| BigInt::from_biguint(Minus, *bu))
+ [ Zero::zero() ]
+ uints.map(|bu| BigInt::from_biguint(Plus, *bu));
let vs = [ &[2], &[1, 1], &[2, 1], &[1, 1, 1] ];
let mut nums = vec::reversed(vs)
.map(|s| BigInt::from_slice(Minus, *s));
nums.push(Zero::zero());
nums.push_all_move(vs.map(|s| BigInt::from_slice(Plus, *s)));
for nums.eachi |i, ni| {
for vec::view(nums, i, nums.len()).eachi |j0, nj| {
@ -1194,59 +1189,57 @@ mod bigint_tests {
#[test]
fn test_convert_int() {
fn check_conv(b: BigInt, i: int) {
fn check(b: BigInt, i: int) {
assert b == Num::from_int(i);
assert b.to_int() == i;
}
check_conv(Zero::zero(), 0);
check_conv(One::one(), 1);
check_conv(
BigInt::from_biguint(
Plus, BigUint::from_uint(int::max_value as uint)),
int::max_value);
check(Zero::zero(), 0);
check(One::one(), 1);
check(BigInt::from_biguint(
Plus, BigUint::from_uint(int::max_value as uint)
), int::max_value);
assert BigInt::from_biguint(
Plus, BigUint::from_uint(int::max_value as uint + 1)
).to_int() == int::max_value;
assert BigInt::from_biguint(
Plus, BigUint::from_at_vec(@[1, 2, 3])
Plus, BigUint::new(~[1, 2, 3])
).to_int() == int::max_value;
check_conv(
BigInt::from_biguint(
Minus, BigUint::from_uint(-int::min_value as uint)),
int::min_value);
check(BigInt::from_biguint(
Minus, BigUint::from_uint(-int::min_value as uint)
), int::min_value);
assert BigInt::from_biguint(
Minus, BigUint::from_uint(-int::min_value as uint + 1)
).to_int() == int::min_value;
assert BigInt::from_biguint(
Minus, BigUint::from_at_vec(@[1, 2, 3])
Minus, BigUint::new(~[1, 2, 3])
).to_int() == int::min_value;
}
#[test]
fn test_convert_uint() {
fn check_conv(b: BigInt, u: uint) {
fn check(b: BigInt, u: uint) {
assert b == BigInt::from_uint(u);
assert b.to_uint() == u;
}
check_conv(Zero::zero(), 0);
check_conv(One::one(), 1);
check(Zero::zero(), 0);
check(One::one(), 1);
check_conv(
check(
BigInt::from_biguint(Plus, BigUint::from_uint(uint::max_value)),
uint::max_value);
assert BigInt::from_biguint(
Plus, BigUint::from_at_vec(@[1, 2, 3])
Plus, BigUint::new(~[1, 2, 3])
).to_uint() == uint::max_value;
assert BigInt::from_biguint(
Minus, BigUint::from_uint(uint::max_value)
).to_uint() == 0;
assert BigInt::from_biguint(
Minus, BigUint::from_at_vec(@[1, 2, 3])
Minus, BigUint::new(~[1, 2, 3])
).to_uint() == 0;
}
@ -1363,44 +1356,39 @@ mod bigint_tests {
#[test]
fn test_divmod() {
fn check_divmod_sub(a: BigInt, b: BigInt) {
let (d, m) = a.divmod(&b);
fn check_sub(a: &BigInt, b: &BigInt, ans_d: &BigInt, ans_m: &BigInt) {
let (d, m) = a.divmod(b);
if m.is_not_zero() {
assert m.sign == b.sign;
}
assert m.abs() <= b.abs();
assert a == b * d + m;
assert *a == b * d + m;
assert d == *ans_d;
assert m == *ans_m;
}
fn check_divmod(a: BigInt, b: BigInt, c: BigInt, d: BigInt) {
check_divmod_sub(a, b);
check_divmod_sub(a, -b);
check_divmod_sub(-a, b);
check_divmod_sub(-a, -b);
if d.is_zero() {
assert a.divmod(&b) == (c, Zero::zero());
assert (-a).divmod(&b) == (-c, Zero::zero());
assert (a).divmod(&-b) == (-c, Zero::zero());
assert (-a).divmod(&-b) == (c, Zero::zero());
fn check(a: &BigInt, b: &BigInt, d: &BigInt, m: &BigInt) {
if m.is_zero() {
check_sub(a, b, d, m);
check_sub(a, &b.neg(), &d.neg(), m);
check_sub(&a.neg(), b, &d.neg(), m);
check_sub(&a.neg(), &b.neg(), d, m);
} else {
// a == bc + d
assert a.divmod(&b) == (c, d);
// a == (-b)(-c - 1) + (d - b)
assert a.divmod(&-b) == (-c - One::one(), d - b);
// (-a) == b (-c - 1) + (b - d)
assert (-a).divmod(&b) == (-c - One::one(), b - d);
// (-a) == (-b)(c) - d
assert (-a).divmod(&-b) == (c, -d);
check_sub(a, b, d, m);
check_sub(a, &b.neg(), &(d.neg() - One::one()), &(m - *b));
check_sub(&a.neg(), b, &(d.neg() - One::one()), &(b - *m));
check_sub(&a.neg(), &b.neg(), d, &m.neg());
}
}
for mul_triples.each |elm| {
let (aVec, bVec, cVec) = *elm;
let a = BigInt::from_slice(Plus, aVec);
let b = BigInt::from_slice(Plus, bVec);
let c = BigInt::from_slice(Plus, cVec);
if a.is_not_zero() { check_divmod(c, a, b, Zero::zero()); }
if b.is_not_zero() { check_divmod(c, b, a, Zero::zero()); }
if a.is_not_zero() { check(&c, &a, &b, &Zero::zero()); }
if b.is_not_zero() { check(&c, &b, &a, &Zero::zero()); }
}
for divmod_quadruples.each |elm| {
@ -1411,7 +1399,7 @@ mod bigint_tests {
let d = BigInt::from_slice(Plus, dVec);
if b.is_not_zero() {
check_divmod(a, b, c, d);
check(&a, &b, &c, &d);
}
}
}
@ -1419,35 +1407,22 @@ mod bigint_tests {
#[test]
fn test_quotrem() {
fn check_quotrem_sub(a: BigInt, b: BigInt) {
let (q, r) = a.quotrem(&b);
fn check_sub(a: &BigInt, b: &BigInt, ans_q: &BigInt, ans_r: &BigInt) {
let (q, r) = a.quotrem(b);
if r.is_not_zero() {
assert r.sign == a.sign;
}
assert r.abs() <= b.abs();
assert a == b * q + r;
assert *a == b * q + r;
assert q == *ans_q;
assert r == *ans_r;
}
fn check_quotrem(a: BigInt, b: BigInt, c: BigInt, d: BigInt) {
check_quotrem_sub(a, b);
check_quotrem_sub(a, -b);
check_quotrem_sub(-a, b);
check_quotrem_sub(-a, -b);
if d.is_zero() {
assert a.quotrem(&b) == (c, Zero::zero());
assert (-a).quotrem(&b) == (-c, Zero::zero());
assert (a).quotrem(&-b) == (-c, Zero::zero());
assert (-a).quotrem(&-b) == (c, Zero::zero());
} else {
// a == bc + d
assert a.quotrem(&b) == (c, d);
// a == (-b)(-c) + d
assert a.quotrem(&-b) == (-c, d);
// (-a) == b (-c) + (-d)
assert (-a).quotrem(&b) == (-c, -d);
// (-a) == (-b)(c) - d
assert (-a).quotrem(&-b) == (c, -d);
}
fn check(a: &BigInt, b: &BigInt, q: &BigInt, r: &BigInt) {
check_sub(a, b, q, r);
check_sub(a, &b.neg(), &q.neg(), r);
check_sub(&a.neg(), b, &q.neg(), &r.neg());
check_sub(&a.neg(), &b.neg(), q, &r.neg());
}
for mul_triples.each |elm| {
let (aVec, bVec, cVec) = *elm;
@ -1455,8 +1430,8 @@ mod bigint_tests {
let b = BigInt::from_slice(Plus, bVec);
let c = BigInt::from_slice(Plus, cVec);
if a.is_not_zero() { check_quotrem(c, a, b, Zero::zero()); }
if b.is_not_zero() { check_quotrem(c, b, a, Zero::zero()); }
if a.is_not_zero() { check(&c, &a, &b, &Zero::zero()); }
if b.is_not_zero() { check(&c, &b, &a, &Zero::zero()); }
}
for divmod_quadruples.each |elm| {
@ -1467,45 +1442,45 @@ mod bigint_tests {
let d = BigInt::from_slice(Plus, dVec);
if b.is_not_zero() {
check_quotrem(a, b, c, d);
check(&a, &b, &c, &d);
}
}
}
#[test]
fn test_to_str_radix() {
assert BigInt::from_biguint(Plus, BigUint::from_uint(10))
.to_str_radix(10) == ~"10";
assert One::one::<BigInt>().to_str_radix(10) == ~"1";
assert Zero::zero::<BigInt>().to_str_radix(10) == ~"0";
assert (-One::one::<BigInt>()).to_str_radix(10) == ~"-1";
assert BigInt::from_biguint(Minus, BigUint::from_uint(10))
.to_str_radix(10) == ~"-10";
fn check(n: int, ans: &str) {
assert ans == Num::from_int::<BigInt>(n).to_str_radix(10);
}
check(10, "10");
check(1, "1");
check(0, "0");
check(-1, "-1");
check(-10, "-10");
}
#[test]
fn test_from_str_radix() {
assert BigInt::from_biguint(Plus, BigUint::from_uint(10)) ==
BigInt::from_str_radix(~"10", 10).get();
assert One::one::<BigInt>() == BigInt::from_str_radix(~"1", 10).get();
assert Zero::zero::<BigInt>() == BigInt::from_str_radix(~"0", 10).get();
assert (-One::one::<BigInt>()) == BigInt::from_str_radix(~"-1", 10).get();
assert BigInt::from_biguint(Minus, BigUint::from_uint(10)) ==
BigInt::from_str_radix(~"-10", 10).get();
assert BigInt::from_str_radix(~"Z", 10) == None;
assert BigInt::from_str_radix(~"_", 2) == None;
assert BigInt::from_str_radix(~"-1", 10) ==
Some(BigInt::from_biguint(Minus, One::one()));
fn check(s: &str, ans: Option<int>) {
let ans = ans.map(|&n| Num::from_int(n));
assert BigInt::from_str_radix(s, 10) == ans;
}
check("10", Some(10));
check("1", Some(1));
check("0", Some(0));
check("-1", Some(-1));
check("-10", Some(-10));
check("Z", None);
check("_", None);
}
#[test]
fn test_neg() {
assert -BigInt::from_at_vec(Plus, @[1, 1, 1]) ==
BigInt::from_at_vec(Minus, @[1, 1, 1]);
assert -BigInt::from_at_vec(Minus, @[1, 1, 1]) ==
BigInt::from_at_vec(Plus, @[1, 1, 1]);
assert -BigInt::new(Plus, ~[1, 1, 1]) ==
BigInt::new(Minus, ~[1, 1, 1]);
assert -BigInt::new(Minus, ~[1, 1, 1]) ==
BigInt::new(Plus, ~[1, 1, 1]);
assert -Zero::zero::<BigInt>() == Zero::zero::<BigInt>();
}
}