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#![allow(unsigned_negation)]
use fmt;
use iter::DoubleEndedIteratorExt;
use num::{Int, cast};
use slice::SliceExt;
#[doc(hidden)]
trait GenericRadix {
fn base(&self) -> u8;
fn prefix(&self) -> &'static str { "" }
fn digit(&self, x: u8) -> u8;
fn fmt_int<T: Int>(&self, mut x: T, f: &mut fmt::Formatter) -> fmt::Result {
let zero = Int::zero();
let is_positive = x >= zero;
let mut buf = [0u8, ..64];
let mut curr = buf.len();
let base = cast(self.base()).unwrap();
if is_positive {
for byte in buf.iter_mut().rev() {
let n = x % base;
x = x / base;
*byte = self.digit(cast(n).unwrap());
curr -= 1;
if x == zero { break };
}
} else {
for byte in buf.iter_mut().rev() {
let n = zero - (x % base);
x = x / base;
*byte = self.digit(cast(n).unwrap());
curr -= 1;
if x == zero { break };
}
}
f.pad_integral(is_positive, self.prefix(), buf[curr..])
}
}
#[deriving(Clone, PartialEq)]
struct Binary;
#[deriving(Clone, PartialEq)]
struct Octal;
#[deriving(Clone, PartialEq)]
struct Decimal;
#[deriving(Clone, PartialEq)]
struct LowerHex;
#[deriving(Clone, PartialEq)]
pub struct UpperHex;
macro_rules! radix {
($T:ident, $base:expr, $prefix:expr, $($x:pat => $conv:expr),+) => {
impl GenericRadix for $T {
fn base(&self) -> u8 { $base }
fn prefix(&self) -> &'static str { $prefix }
fn digit(&self, x: u8) -> u8 {
match x {
$($x => $conv,)+
x => panic!("number not in the range 0..{}: {}", self.base() - 1, x),
}
}
}
}
}
radix! { Binary, 2, "0b", x @ 0 ... 2 => b'0' + x }
radix! { Octal, 8, "0o", x @ 0 ... 7 => b'0' + x }
radix! { Decimal, 10, "", x @ 0 ... 9 => b'0' + x }
radix! { LowerHex, 16, "0x", x @ 0 ... 9 => b'0' + x,
x @ 10 ... 15 => b'a' + (x - 10) }
radix! { UpperHex, 16, "0x", x @ 0 ... 9 => b'0' + x,
x @ 10 ... 15 => b'A' + (x - 10) }
#[deriving(Clone, Copy, PartialEq)]
#[unstable = "may be renamed or move to a different module"]
pub struct Radix {
base: u8,
}
impl Radix {
fn new(base: u8) -> Radix {
assert!(2 <= base && base <= 36, "the base must be in the range of 2..36: {}", base);
Radix { base: base }
}
}
impl GenericRadix for Radix {
fn base(&self) -> u8 { self.base }
fn digit(&self, x: u8) -> u8 {
match x {
x @ 0 ... 9 => b'0' + x,
x if x < self.base() => b'a' + (x - 10),
x => panic!("number not in the range 0..{}: {}", self.base() - 1, x),
}
}
}
#[unstable = "may be renamed or move to a different module"]
#[deriving(Copy)]
pub struct RadixFmt<T, R>(T, R);
#[unstable = "may be renamed or move to a different module"]
pub fn radix<T>(x: T, base: u8) -> RadixFmt<T, Radix> {
RadixFmt(x, Radix::new(base))
}
macro_rules! radix_fmt {
($T:ty as $U:ty, $fmt:ident) => {
impl fmt::Show for RadixFmt<$T, Radix> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self { RadixFmt(ref x, radix) => radix.$fmt(*x as $U, f) }
}
}
}
}
macro_rules! int_base {
($Trait:ident for $T:ident as $U:ident -> $Radix:ident) => {
impl fmt::$Trait for $T {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
$Radix.fmt_int(*self as $U, f)
}
}
}
}
macro_rules! integer {
($Int:ident, $Uint:ident) => {
int_base! { Show for $Int as $Int -> Decimal }
int_base! { Binary for $Int as $Uint -> Binary }
int_base! { Octal for $Int as $Uint -> Octal }
int_base! { LowerHex for $Int as $Uint -> LowerHex }
int_base! { UpperHex for $Int as $Uint -> UpperHex }
radix_fmt! { $Int as $Int, fmt_int }
int_base! { Show for $Uint as $Uint -> Decimal }
int_base! { Binary for $Uint as $Uint -> Binary }
int_base! { Octal for $Uint as $Uint -> Octal }
int_base! { LowerHex for $Uint as $Uint -> LowerHex }
int_base! { UpperHex for $Uint as $Uint -> UpperHex }
radix_fmt! { $Uint as $Uint, fmt_int }
}
}
integer! { int, uint }
integer! { i8, u8 }
integer! { i16, u16 }
integer! { i32, u32 }
integer! { i64, u64 }