/// Values per occurrence for an argument
#[derive(Copy, Clone, PartialEq, Eq, Hash)]
pub struct ValueRange {
start_inclusive: usize,
end_inclusive: usize,
}
impl ValueRange {
/// Nor argument values, or a flag
pub const EMPTY: Self = Self {
start_inclusive: 0,
end_inclusive: 0,
};
/// A single argument value, the most common case for options
pub const SINGLE: Self = Self {
start_inclusive: 1,
end_inclusive: 1,
};
/// Create a range
///
/// # Panics
///
/// If the end is less than the start (debug builds)
///
/// # Examples
///
/// ```rust
/// # use clap_builder as clap;
/// # use clap::builder::ValueRange;
/// let range = ValueRange::new(5);
/// let range = ValueRange::new(5..10);
/// let range = ValueRange::new(5..=10);
/// let range = ValueRange::new(5..);
/// let range = ValueRange::new(..10);
/// let range = ValueRange::new(..=10);
/// ```
///
/// While this will panic:
/// ```should_panic
/// # use clap_builder as clap;
/// # use clap::builder::ValueRange;
/// let range = ValueRange::new(10..5); // Panics!
/// ```
pub fn new(range: impl Into<Self>) -> Self {
range.into()
}
pub(crate) fn raw(start_inclusive: usize, end_inclusive: usize) -> Self {
debug_assert!(start_inclusive <= end_inclusive);
Self {
start_inclusive,
end_inclusive,
}
}
/// Fewest number of values the argument accepts
pub fn min_values(&self) -> usize {
self.start_inclusive
}
/// Most number of values the argument accepts
pub fn max_values(&self) -> usize {
self.end_inclusive
}
/// Report whether the argument takes any values (ie is a flag)
///
/// # Examples
///
/// ```rust
/// # use clap_builder as clap;
/// # use clap::builder::ValueRange;
/// let range = ValueRange::new(5);
/// assert!(range.takes_values());
///
/// let range = ValueRange::new(0);
/// assert!(!range.takes_values());
/// ```
pub fn takes_values(&self) -> bool {
self.end_inclusive != 0
}
pub(crate) fn is_unbounded(&self) -> bool {
self.end_inclusive == usize::MAX
}
pub(crate) fn is_fixed(&self) -> bool {
self.start_inclusive == self.end_inclusive
}
pub(crate) fn is_multiple(&self) -> bool {
self.start_inclusive != self.end_inclusive || 1 < self.start_inclusive
}
pub(crate) fn num_values(&self) -> Option<usize> {
self.is_fixed().then_some(self.start_inclusive)
}
pub(crate) fn accepts_more(&self, current: usize) -> bool {
current < self.end_inclusive
}
}
impl std::ops::RangeBounds<usize> for ValueRange {
fn start_bound(&self) -> std::ops::Bound<&usize> {
std::ops::Bound::Included(&self.start_inclusive)
}
fn end_bound(&self) -> std::ops::Bound<&usize> {
std::ops::Bound::Included(&self.end_inclusive)
}
}
impl Default for ValueRange {
fn default() -> Self {
Self::SINGLE
}
}
impl From<usize> for ValueRange {
fn from(fixed: usize) -> Self {
(fixed..=fixed).into()
}
}
impl From<std::ops::Range<usize>> for ValueRange {
fn from(range: std::ops::Range<usize>) -> Self {
let start_inclusive = range.start;
let end_inclusive = range.end.saturating_sub(1);
Self::raw(start_inclusive, end_inclusive)
}
}
impl From<std::ops::RangeFull> for ValueRange {
fn from(_: std::ops::RangeFull) -> Self {
let start_inclusive = 0;
let end_inclusive = usize::MAX;
Self::raw(start_inclusive, end_inclusive)
}
}
impl From<std::ops::RangeFrom<usize>> for ValueRange {
fn from(range: std::ops::RangeFrom<usize>) -> Self {
let start_inclusive = range.start;
let end_inclusive = usize::MAX;
Self::raw(start_inclusive, end_inclusive)
}
}
impl From<std::ops::RangeTo<usize>> for ValueRange {
fn from(range: std::ops::RangeTo<usize>) -> Self {
let start_inclusive = 0;
let end_inclusive = range.end.saturating_sub(1);
Self::raw(start_inclusive, end_inclusive)
}
}
impl From<std::ops::RangeInclusive<usize>> for ValueRange {
fn from(range: std::ops::RangeInclusive<usize>) -> Self {
let start_inclusive = *range.start();
let end_inclusive = *range.end();
Self::raw(start_inclusive, end_inclusive)
}
}
impl From<std::ops::RangeToInclusive<usize>> for ValueRange {
fn from(range: std::ops::RangeToInclusive<usize>) -> Self {
let start_inclusive = 0;
let end_inclusive = range.end;
Self::raw(start_inclusive, end_inclusive)
}
}
impl std::fmt::Display for ValueRange {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
ok!(self.start_inclusive.fmt(f));
if !self.is_fixed() {
ok!("..=".fmt(f));
ok!(self.end_inclusive.fmt(f));
}
Ok(())
}
}
impl std::fmt::Debug for ValueRange {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{self}")
}
}
#[cfg(test)]
mod test {
use super::*;
use std::ops::RangeBounds;
#[test]
fn from_fixed() {
let range: ValueRange = 5.into();
assert_eq!(range.start_bound(), std::ops::Bound::Included(&5));
assert_eq!(range.end_bound(), std::ops::Bound::Included(&5));
assert!(range.is_fixed());
assert!(range.is_multiple());
assert_eq!(range.num_values(), Some(5));
assert!(range.takes_values());
}
#[test]
fn from_fixed_empty() {
let range: ValueRange = 0.into();
assert_eq!(range.start_bound(), std::ops::Bound::Included(&0));
assert_eq!(range.end_bound(), std::ops::Bound::Included(&0));
assert!(range.is_fixed());
assert!(!range.is_multiple());
assert_eq!(range.num_values(), Some(0));
assert!(!range.takes_values());
}
#[test]
fn from_range() {
let range: ValueRange = (5..10).into();
assert_eq!(range.start_bound(), std::ops::Bound::Included(&5));
assert_eq!(range.end_bound(), std::ops::Bound::Included(&9));
assert!(!range.is_fixed());
assert!(range.is_multiple());
assert_eq!(range.num_values(), None);
assert!(range.takes_values());
}
#[test]
fn from_range_inclusive() {
let range: ValueRange = (5..=10).into();
assert_eq!(range.start_bound(), std::ops::Bound::Included(&5));
assert_eq!(range.end_bound(), std::ops::Bound::Included(&10));
assert!(!range.is_fixed());
assert!(range.is_multiple());
assert_eq!(range.num_values(), None);
assert!(range.takes_values());
}
#[test]
fn from_range_full() {
let range: ValueRange = (..).into();
assert_eq!(range.start_bound(), std::ops::Bound::Included(&0));
assert_eq!(range.end_bound(), std::ops::Bound::Included(&usize::MAX));
assert!(!range.is_fixed());
assert!(range.is_multiple());
assert_eq!(range.num_values(), None);
assert!(range.takes_values());
}
#[test]
fn from_range_from() {
let range: ValueRange = (5..).into();
assert_eq!(range.start_bound(), std::ops::Bound::Included(&5));
assert_eq!(range.end_bound(), std::ops::Bound::Included(&usize::MAX));
assert!(!range.is_fixed());
assert!(range.is_multiple());
assert_eq!(range.num_values(), None);
assert!(range.takes_values());
}
#[test]
fn from_range_to() {
let range: ValueRange = (..10).into();
assert_eq!(range.start_bound(), std::ops::Bound::Included(&0));
assert_eq!(range.end_bound(), std::ops::Bound::Included(&9));
assert!(!range.is_fixed());
assert!(range.is_multiple());
assert_eq!(range.num_values(), None);
assert!(range.takes_values());
}
#[test]
fn from_range_to_inclusive() {
let range: ValueRange = (..=10).into();
assert_eq!(range.start_bound(), std::ops::Bound::Included(&0));
assert_eq!(range.end_bound(), std::ops::Bound::Included(&10));
assert!(!range.is_fixed());
assert!(range.is_multiple());
assert_eq!(range.num_values(), None);
assert!(range.takes_values());
}
}
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