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use crate::{BoundaryCheck, SinglePickable, pickable_needed::*};
macro_rules! impl_single_pickable_num {
($($t:ty),+ $(,)?) => {
$(impl SinglePickable for $t {
fn pick_single(str: Option<&str>) -> PickerArgResult<Self> {
match str {
Some(s) => s.parse::<$t>().map(PickerArgResult::Parsed).unwrap_or(PickerArgResult::NotFound),
None => PickerArgResult::NotFound,
}
}
})+
};
}
/// Returns `true` if `raw` looks like an integer (digits, optional `+`/`-` prefix,
/// no decimal point or exponent).
fn is_int_like(raw: &str) -> bool {
let s = raw.trim();
let bytes = s.as_bytes();
if bytes.is_empty() {
return false;
}
let mut i = 0;
if bytes[0] == b'-' || bytes[0] == b'+' {
i = 1;
}
if i >= bytes.len() {
return false;
}
for &b in &bytes[i..] {
if !b.is_ascii_digit() {
return false;
}
}
true
}
/// Returns `true` if `raw` looks like a float (contains `.`, `e`, or `E`).
fn is_float_like(raw: &str) -> bool {
let s = raw.trim();
s.contains('.') || s.contains('e') || s.contains('E')
}
impl_single_pickable_num! {
i8, i16, i32, i64, i128, isize,
u8, u16, u32, u64, u128, usize,
f32, f64,
}
// Integer boundary: only accept strings that look like integers.
// Float-like strings trigger a boundary.
macro_rules! impl_boundary_check_int {
($($t:ty),+ $(,)?) => {
$(impl BoundaryCheck for $t {
fn check_boundary(raw: &str) -> bool {
!is_int_like(raw)
}
})+
};
}
impl_boundary_check_int! {
i8, i16, i32, i64, i128, isize,
u8, u16, u32, u64, u128, usize,
}
// Float boundary: only accept strings that look like floats.
// Integer-like strings trigger a boundary.
impl BoundaryCheck for f32 {
fn check_boundary(raw: &str) -> bool {
!is_float_like(raw) || raw.parse::<f32>().is_err()
}
}
impl BoundaryCheck for f64 {
fn check_boundary(raw: &str) -> bool {
!is_float_like(raw) || raw.parse::<f64>().is_err()
}
}
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