////! Implements the algorithm in terms of the lexical API.
#![doc(hidden)]
use lexical_util::format::{NumberFormat, STANDARD};
use lexical_util::{from_lexical, from_lexical_with_options};
use crate::options::{Options, STANDARD as DEFAULT_OPTIONS};
use crate::parse::ParseInteger;
/// Implement `FromLexical` for numeric type.
///
/// Need to inline these, otherwise code generation is sub-optimal.
/// For some reason, it can't determine some of the const evaluations
/// can actually be evaluated at compile-time, which causes major branching
/// issues.
macro_rules! integer_from_lexical {
($($t:ident $unsigned:ident ; )*) => ($(
impl FromLexical for $t {
#[cfg_attr(not(feature = "compact"), inline)]
fn from_lexical(bytes: &[u8]) -> lexical_util::result::Result<Self>
{
Self::parse_complete::<STANDARD>(bytes, &DEFAULT_OPTIONS)
}
#[cfg_attr(not(feature = "compact"), inline)]
fn from_lexical_partial(
bytes: &[u8],
) -> lexical_util::result::Result<(Self, usize)>
{
Self::parse_partial::<STANDARD>(bytes, &DEFAULT_OPTIONS)
}
}
impl FromLexicalWithOptions for $t {
type Options = Options;
#[cfg_attr(not(feature = "compact"), inline)]
fn from_lexical_with_options<const FORMAT: u128>(
bytes: &[u8],
options: &Self::Options,
) -> lexical_util::result::Result<Self>
{
let format = NumberFormat::<{ FORMAT }> {};
if !format.is_valid() {
return Err(format.error());
}
Self::parse_complete::<FORMAT>(bytes, options)
}
#[cfg_attr(not(feature = "compact"), inline)]
fn from_lexical_partial_with_options<const FORMAT: u128>(
bytes: &[u8],
options: &Self::Options,
) -> lexical_util::result::Result<(Self, usize)>
{
let format = NumberFormat::<{ FORMAT }> {};
if !format.is_valid() {
return Err(format.error());
}
Self::parse_partial::<FORMAT>(bytes, options)
}
}
)*)
}
from_lexical!("lexical_parse_integer", 1234, u64, 4);
from_lexical_with_options!("lexical_parse_integer", 1234, u64, 4, Options);
integer_from_lexical! {
u8 u8 ;
u16 u16 ;
u32 u32 ;
u64 u64 ;
u128 u128 ;
usize usize ;
i8 u8 ;
i16 u16 ;
i32 u32 ;
i64 u64 ;
i128 u128 ;
isize usize ;
}
