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Simplify integer conversion logic

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This commit is contained in:
David Tolnay 2017-04-05 13:06:05 -07:00
parent 145733ce77
commit e7d3d515df
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GPG Key ID: F9BA143B95FF6D82
1 changed files with 42 additions and 77 deletions
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119
serde/src/de/from_primitive.rs
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@ -8,71 +8,36 @@
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// Extracted from https://github.com/rust-num/num.
// Rust 1.5 is unhappy that this private module is undocumented.
#![allow(missing_docs)]
use core::{usize, u8, u16, u32, u64};
use core::{isize, i8, i16, i32, i64};
use core::{f32, f64};
use core::mem::size_of;
macro_rules! int_to_int {
($SrcT:ty, $DstT:ty, $slf:expr) => (
{
if size_of::<$SrcT>() <= size_of::<$DstT>() {
Some($slf as $DstT)
} else {
let n = $slf as i64;
if <$DstT>::min_value() as i64 <= n && n <= <$DstT>::max_value() as i64 {
Some($slf as $DstT)
} else {
None
}
}
($dst:ident, $n:ident) => (
if $dst::MIN as i64 <= $n as i64 && $n as i64 <= $dst::MAX as i64 {
Some($n as $dst)
} else {
None
}
)
}
macro_rules! int_to_uint {
($SrcT:ty, $DstT:ty, $slf:expr) => (
{
let zero: $SrcT = 0;
if zero <= $slf && $slf as u64 <= <$DstT>::max_value() as u64 {
Some($slf as $DstT)
} else {
None
}
($dst:ident, $n:ident) => (
if 0 <= $n && $n as u64 <= $dst::MAX as u64 {
Some($n as $dst)
} else {
None
}
)
}
macro_rules! uint_to_int {
($DstT:ty, $slf:expr) => (
{
if $slf as u64 <= <$DstT>::max_value() as u64 {
Some($slf as $DstT)
} else {
None
}
}
)
}
macro_rules! uint_to_uint {
($SrcT:ty, $DstT:ty, $slf:expr) => (
{
if size_of::<$SrcT>() <= size_of::<$DstT>() {
Some($slf as $DstT)
} else {
let zero: $SrcT = 0;
if zero <= $slf && $slf as u64 <= <$DstT>::max_value() as u64 {
Some($slf as $DstT)
} else {
None
}
}
macro_rules! uint_to {
($dst:ident, $n:ident) => (
if $n as u64 <= $dst::MAX as u64 {
Some($n as $dst)
} else {
None
}
)
}
@ -91,42 +56,42 @@ pub trait FromPrimitive: Sized {
}
macro_rules! impl_from_primitive_for_int {
($T:ty) => (
impl FromPrimitive for $T {
#[inline] fn from_isize(n: isize) -> Option<Self> { int_to_int!(isize, $T, n) }
#[inline] fn from_i8(n: i8) -> Option<Self> { int_to_int!(i8, $T, n) }
#[inline] fn from_i16(n: i16) -> Option<Self> { int_to_int!(i16, $T, n) }
#[inline] fn from_i32(n: i32) -> Option<Self> { int_to_int!(i32, $T, n) }
#[inline] fn from_i64(n: i64) -> Option<Self> { int_to_int!(i64, $T, n) }
#[inline] fn from_usize(n: usize) -> Option<Self> { uint_to_int!($T, n) }
#[inline] fn from_u8(n: u8) -> Option<Self> { uint_to_int!($T, n) }
#[inline] fn from_u16(n: u16) -> Option<Self> { uint_to_int!($T, n) }
#[inline] fn from_u32(n: u32) -> Option<Self> { uint_to_int!($T, n) }
#[inline] fn from_u64(n: u64) -> Option<Self> { uint_to_int!($T, n) }
($t:ident) => (
impl FromPrimitive for $t {
#[inline] fn from_isize(n: isize) -> Option<Self> { int_to_int!($t, n) }
#[inline] fn from_i8(n: i8) -> Option<Self> { int_to_int!($t, n) }
#[inline] fn from_i16(n: i16) -> Option<Self> { int_to_int!($t, n) }
#[inline] fn from_i32(n: i32) -> Option<Self> { int_to_int!($t, n) }
#[inline] fn from_i64(n: i64) -> Option<Self> { int_to_int!($t, n) }
#[inline] fn from_usize(n: usize) -> Option<Self> { uint_to!($t, n) }
#[inline] fn from_u8(n: u8) -> Option<Self> { uint_to!($t, n) }
#[inline] fn from_u16(n: u16) -> Option<Self> { uint_to!($t, n) }
#[inline] fn from_u32(n: u32) -> Option<Self> { uint_to!($t, n) }
#[inline] fn from_u64(n: u64) -> Option<Self> { uint_to!($t, n) }
}
)
}
macro_rules! impl_from_primitive_for_uint {
($T:ty) => (
impl FromPrimitive for $T {
#[inline] fn from_isize(n: isize) -> Option<Self> { int_to_uint!(isize, $T, n) }
#[inline] fn from_i8(n: i8) -> Option<Self> { int_to_uint!(i8, $T, n) }
#[inline] fn from_i16(n: i16) -> Option<Self> { int_to_uint!(i16, $T, n) }
#[inline] fn from_i32(n: i32) -> Option<Self> { int_to_uint!(i32, $T, n) }
#[inline] fn from_i64(n: i64) -> Option<Self> { int_to_uint!(i64, $T, n) }
#[inline] fn from_usize(n: usize) -> Option<Self> { uint_to_uint!(usize, $T, n) }
#[inline] fn from_u8(n: u8) -> Option<Self> { uint_to_uint!(u8, $T, n) }
#[inline] fn from_u16(n: u16) -> Option<Self> { uint_to_uint!(u16, $T, n) }
#[inline] fn from_u32(n: u32) -> Option<Self> { uint_to_uint!(u32, $T, n) }
#[inline] fn from_u64(n: u64) -> Option<Self> { uint_to_uint!(u64, $T, n) }
($t:ident) => (
impl FromPrimitive for $t {
#[inline] fn from_isize(n: isize) -> Option<Self> { int_to_uint!($t, n) }
#[inline] fn from_i8(n: i8) -> Option<Self> { int_to_uint!($t, n) }
#[inline] fn from_i16(n: i16) -> Option<Self> { int_to_uint!($t, n) }
#[inline] fn from_i32(n: i32) -> Option<Self> { int_to_uint!($t, n) }
#[inline] fn from_i64(n: i64) -> Option<Self> { int_to_uint!($t, n) }
#[inline] fn from_usize(n: usize) -> Option<Self> { uint_to!($t, n) }
#[inline] fn from_u8(n: u8) -> Option<Self> { uint_to!($t, n) }
#[inline] fn from_u16(n: u16) -> Option<Self> { uint_to!($t, n) }
#[inline] fn from_u32(n: u32) -> Option<Self> { uint_to!($t, n) }
#[inline] fn from_u64(n: u64) -> Option<Self> { uint_to!($t, n) }
}
)
}
macro_rules! impl_from_primitive_for_float {
($T:ty) => (
impl FromPrimitive for $T {
($t:ident) => (
impl FromPrimitive for $t {
#[inline] fn from_isize(n: isize) -> Option<Self> { Some(n as Self) }
#[inline] fn from_i8(n: i8) -> Option<Self> { Some(n as Self) }
#[inline] fn from_i16(n: i16) -> Option<Self> { Some(n as Self) }