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use core::cmp::Ordering;
use core::fmt;
use core::ops;
use crate as rune;
use crate::alloc::clone::TryClone;
use crate::runtime::{
EnvProtocolCaller, FromValue, Inline, ProtocolCaller, Repr, RuntimeError, ToValue, Value,
VmErrorKind, VmResult,
};
use crate::Any;
/// Type for a from range expression `start..`.
///
/// # Examples
///
/// ```rune
/// use std::ops::RangeFrom;
///
/// let range = 0..;
///
/// assert!(!range.contains(-10));
/// assert!(range.contains(5));
/// assert!(range.contains(10));
/// assert!(range.contains(20));
///
/// assert!(range is RangeFrom);
/// ```
///
/// Ranges can contain any type:
///
/// ```rune
/// let range = 'a'..;
/// assert_eq!(range.start, 'a');
/// range.start = 'b';
/// assert_eq!(range.start, 'b');
/// ```
///
/// Certain ranges can be used as iterators:
///
/// ```rune
/// let range = 'a'..;
/// assert_eq!(range.iter().take(5).collect::<Vec>(), ['a', 'b', 'c', 'd', 'e']);
/// ```
///
/// # Rust examples
///
/// ```rust
/// use rune::runtime::RangeFrom;
///
/// let start = rune::to_value(1)?;
/// let _ = RangeFrom::new(start);
/// # Ok::<_, rune::support::Error>(())
/// ```
#[derive(Any, Clone, TryClone)]
#[try_clone(crate)]
#[rune(crate, constructor, item = ::std::ops)]
pub struct RangeFrom {
/// The start value of the range.
#[rune(get, set)]
pub start: Value,
}
impl RangeFrom {
/// Construct a new range.
pub fn new(start: Value) -> Self {
Self { start }
}
/// Iterate over the range.
///
/// # Panics
///
/// This panics if the range is not a well-defined range.
///
/// # Examples
///
/// ```rune
/// let range = 'a'..;
/// assert_eq!(range.iter().take(5).collect::<Vec>(), ['a', 'b', 'c', 'd', 'e']);
/// ```
///
/// Cannot construct an iterator over floats:
///
/// ```rune,should_panic
/// let range = 1.0..;
/// range.iter()
/// ```
#[rune::function(keep)]
pub fn iter(&self) -> VmResult<Value> {
let value = match self.start.as_ref() {
Repr::Inline(Inline::Unsigned(start)) => {
vm_try!(crate::to_value(RangeFromIter::new(*start..)))
}
Repr::Inline(Inline::Signed(start)) => {
vm_try!(crate::to_value(RangeFromIter::new(*start..)))
}
Repr::Inline(Inline::Char(start)) => {
vm_try!(crate::to_value(RangeFromIter::new(*start..)))
}
start => {
return VmResult::err(VmErrorKind::UnsupportedIterRangeFrom {
start: start.type_info(),
})
}
};
VmResult::Ok(value)
}
/// Build an iterator over the range.
///
/// # Panics
///
/// This panics if the range is not a well-defined range.
///
/// # Examples
///
/// ```rune
/// let vec = [];
///
/// for value in 'a'.. {
/// vec.push(value);
///
/// if value == 'e' {
/// break;
/// }
/// }
///
/// assert_eq!(vec, ['a', 'b', 'c', 'd', 'e']);
/// ```
///
/// Cannot construct an iterator over floats:
///
/// ```rune,should_panic
/// let range = 1.0..;
///
/// for value in 1.0 .. {
/// }
/// ```
#[rune::function(keep, protocol = INTO_ITER)]
pub fn into_iter(&self) -> VmResult<Value> {
self.iter()
}
/// Test the range for partial equality.
///
/// # Examples
///
/// ```rune
/// let range = 'a'..;
/// assert!(range == ('a'..));
/// assert!(range != ('b'..));
///
/// let range = 1.0..;
/// assert!(range == (1.0..));
/// assert!(range != (f64::NAN..));
/// assert!((f64::NAN..) != (f64::NAN..));
/// ```
#[rune::function(keep, protocol = PARTIAL_EQ)]
pub fn partial_eq(&self, other: &Self) -> VmResult<bool> {
self.partial_eq_with(other, &mut EnvProtocolCaller)
}
pub(crate) fn partial_eq_with(
&self,
b: &Self,
caller: &mut dyn ProtocolCaller,
) -> VmResult<bool> {
Value::partial_eq_with(&self.start, &b.start, caller)
}
/// Test the range for total equality.
///
/// # Examples
///
/// ```rune
/// use std::ops::eq;
///
/// let range = 'a'..;
/// assert!(eq(range, 'a'..));
/// assert!(!eq(range, 'b'..));
/// ```
#[rune::function(keep, protocol = EQ)]
pub fn eq(&self, other: &Self) -> VmResult<bool> {
self.eq_with(other, &mut EnvProtocolCaller)
}
pub(crate) fn eq_with(&self, b: &Self, caller: &mut dyn ProtocolCaller) -> VmResult<bool> {
Value::eq_with(&self.start, &b.start, caller)
}
/// Test the range for partial ordering.
///
/// # Examples
///
/// ```rune
/// assert!(('a'..) < ('b'..));
/// assert!(('c'..) > ('b'..));
/// assert!(!((f64::NAN..) > (f64::INFINITY..)));
/// assert!(!((f64::NAN..) < (f64::INFINITY..)));
/// ```
#[rune::function(keep, protocol = PARTIAL_CMP)]
pub fn partial_cmp(&self, other: &Self) -> VmResult<Option<Ordering>> {
self.partial_cmp_with(other, &mut EnvProtocolCaller)
}
pub(crate) fn partial_cmp_with(
&self,
b: &Self,
caller: &mut dyn ProtocolCaller,
) -> VmResult<Option<Ordering>> {
Value::partial_cmp_with(&self.start, &b.start, caller)
}
/// Test the range for total ordering.
///
/// # Examples
///
/// ```rune
/// use std::ops::cmp;
/// use std::cmp::Ordering;
///
/// assert_eq!(cmp('a'.., 'b'..), Ordering::Less);
/// assert_eq!(cmp('c'.., 'b'..), Ordering::Greater);
/// ```
#[rune::function(keep, protocol = CMP)]
pub fn cmp(&self, other: &Self) -> VmResult<Ordering> {
self.cmp_with(other, &mut EnvProtocolCaller)
}
pub(crate) fn cmp_with(&self, b: &Self, caller: &mut dyn ProtocolCaller) -> VmResult<Ordering> {
Value::cmp_with(&self.start, &b.start, caller)
}
/// Test if the range contains the given value.
///
/// The check is performed using the [`PARTIAL_CMP`] protocol.
///
/// # Examples
///
/// ```rune
/// use std::ops::RangeFrom;
///
/// let range = 0..;
///
/// assert!(!range.contains(-10));
/// assert!(range.contains(5));
/// assert!(range.contains(10));
/// assert!(range.contains(20));
///
/// assert!(range is RangeFrom);
/// ```
#[rune::function(keep)]
pub(crate) fn contains(&self, value: Value) -> VmResult<bool> {
self.contains_with(value, &mut EnvProtocolCaller)
}
pub(crate) fn contains_with(
&self,
value: Value,
caller: &mut dyn ProtocolCaller,
) -> VmResult<bool> {
VmResult::Ok(matches!(
vm_try!(Value::partial_cmp_with(&self.start, &value, caller)),
Some(Ordering::Less | Ordering::Equal)
))
}
}
impl fmt::Debug for RangeFrom {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{:?}..", self.start)
}
}
impl<Idx> ToValue for ops::RangeFrom<Idx>
where
Idx: ToValue,
{
fn to_value(self) -> Result<Value, RuntimeError> {
let start = self.start.to_value()?;
let range = RangeFrom::new(start);
Ok(Value::new(range)?)
}
}
impl<Idx> FromValue for ops::RangeFrom<Idx>
where
Idx: FromValue,
{
#[inline]
fn from_value(value: Value) -> Result<Self, RuntimeError> {
let range = value.downcast::<RangeFrom>()?;
let start = Idx::from_value(range.start)?;
Ok(ops::RangeFrom { start })
}
}
range_iter!(RangeFrom, RangeFromIter<T>, {
#[rune::function(instance, keep, protocol = SIZE_HINT)]
#[inline]
pub(crate) fn size_hint(&self) -> (u64, Option<u64>) {
(u64::MAX, None)
}
});