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|
use core::fmt;
use std::{
marker::PhantomData,
ops::{Range, RangeBounds, RangeFrom, RangeInclusive, RangeTo, RangeToInclusive},
path::PathBuf,
str::FromStr,
};
pub struct Formula<T: FromStr> {
pub(crate) check_fn: Option<(String, Box<dyn FnMut(&T) -> bool>)>,
pub(crate) failure: String,
pub(crate) missing: Option<String>,
phantom: PhantomData<T>,
}
impl<T: FromStr> Formula<T> {
pub fn new<S: Into<String>>(failure: S) -> Self {
Self {
check_fn: None,
failure: failure.into(),
missing: None,
phantom: PhantomData::default(),
}
}
pub fn check<S: Into<String>, F>(mut self, fail: S, check: F) -> Self
where
F: FnMut(&T) -> bool + 'static,
{
self.check_fn = Some((fail.into(), Box::new(check)));
self
}
pub fn required<S: Into<String>>(mut self, missing: S) -> Self {
self.missing = Some(missing.into());
self
}
}
impl<T: FromStr> From<String> for Formula<T> {
fn from(value: String) -> Self {
Formula::new(value)
}
}
impl<T: FromStr> From<&str> for Formula<T> {
fn from(value: &str) -> Self {
Formula::new(value)
}
}
impl From<F32Formula> for Formula<f32> {
fn from(value: F32Formula) -> Self {
let F32Formula { bounds } = value;
let form = Formula::new("Failed to parse [opt] as a number");
if let Some(bounds) = bounds {
let fail = format!("[opt] must be {bounds}");
form.check(fail, move |u| bounds.contains(&u))
} else {
form
}
}
}
impl From<PathFormula> for Formula<PathBuf> {
fn from(_value: PathFormula) -> Self {
Formula::new("Failed to parse [opt] as a path")
}
}
pub struct F32Formula {
bounds: Option<Ranges<f32>>,
}
impl F32Formula {
pub fn new() -> Self {
Self { bounds: None }
}
pub fn bounds<R: Into<Ranges<f32>>>(mut self, bounds: R) -> Self {
self.bounds = Some(bounds.into());
self
}
}
pub enum Ranges<T> {
Exlusive(Range<T>),
Inclusive(RangeInclusive<T>),
From(RangeFrom<T>),
To(RangeTo<T>),
ToInclusive(RangeToInclusive<T>),
}
impl<T> From<Range<T>> for Ranges<T> {
fn from(value: Range<T>) -> Self {
Ranges::Exlusive(value)
}
}
impl<T> From<RangeFrom<T>> for Ranges<T> {
fn from(value: RangeFrom<T>) -> Self {
Ranges::From(value)
}
}
impl<T> From<RangeTo<T>> for Ranges<T> {
fn from(value: RangeTo<T>) -> Self {
Ranges::To(value)
}
}
impl<T> From<RangeInclusive<T>> for Ranges<T> {
fn from(value: RangeInclusive<T>) -> Self {
Ranges::Inclusive(value)
}
}
impl<T> From<RangeToInclusive<T>> for Ranges<T> {
fn from(value: RangeToInclusive<T>) -> Self {
Ranges::ToInclusive(value)
}
}
impl<T: fmt::Display> fmt::Display for Ranges<T> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Ranges::Exlusive(range) => {
write!(f, "from {} and less than {}", range.start, range.end)
}
Ranges::Inclusive(range) => write!(f, "from {} to {}", range.start(), range.end()),
Ranges::From(range) => write!(f, "greater than {}", range.start),
Ranges::To(range) => write!(f, "less than {}", range.end),
Ranges::ToInclusive(range) => write!(f, "from 0 to {}", range.end),
}
}
}
impl<T: PartialEq> Ranges<T> {
pub fn contains<U>(&self, item: &U) -> bool
where
T: PartialOrd<U>,
U: PartialOrd<T> + ?Sized,
{
match self {
Ranges::Exlusive(range) => range.contains(item),
Ranges::Inclusive(range) => range.contains(item),
Ranges::From(range) => range.contains(item),
Ranges::To(range) => range.contains(item),
Ranges::ToInclusive(range) => range.contains(item),
}
}
}
pub struct PathFormula;
impl PathFormula {
pub fn new() -> Self {
Self {}
}
}
macro_rules! int_formula_impl {
($meow:ident $woof:ty) => {
pub struct $meow {
bounds: Option<Ranges<$woof>>,
}
impl $meow {
pub fn new() -> Self {
Self { bounds: None }
}
pub fn bounds<R: Into<Ranges<$woof>>>(mut self, bounds: R) -> Self {
self.bounds = Some(bounds.into());
self
}
}
impl From<$meow> for Formula<$woof> {
fn from(value: $meow) -> Self {
let $meow { bounds } = value;
let form = Formula::new("Failed to parse [opt] as an integer");
if let Some(bounds) = bounds {
let fail = format!("[opt] must be {bounds}");
form.check(fail, move |u| bounds.contains(&u))
} else {
form
}
}
}
};
}
int_formula_impl!(U8Formula u8);
int_formula_impl!(U16Formula u16);
int_formula_impl!(U32Formula u32);
int_formula_impl!(U64Formula u64);
int_formula_impl!(UsizeFormula usize);
int_formula_impl!(I8Formula i8);
int_formula_impl!(I16Formula i16);
int_formula_impl!(I32Formula i32);
int_formula_impl!(I64Formula i64);
int_formula_impl!(IsizeFormula isize);
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