rhai/src/packages/iter_basic.rs
2020-11-25 09:36:06 +08:00

106 lines
3.0 KiB
Rust

use crate::dynamic::Variant;
use crate::stdlib::{
boxed::Box,
ops::{Add, Range},
};
use crate::{def_package, EvalAltResult, INT};
fn get_range<T: Variant + Clone>(from: T, to: T) -> Result<Range<T>, Box<EvalAltResult>> {
Ok(from..to)
}
// Register range function with step
#[derive(Debug, Clone, Copy, Hash, Eq, PartialEq)]
struct StepRange<T>(T, T, T)
where
for<'a> &'a T: Add<&'a T, Output = T>,
T: Variant + Clone + PartialOrd;
impl<T> Iterator for StepRange<T>
where
for<'a> &'a T: Add<&'a T, Output = T>,
T: Variant + Clone + PartialOrd,
{
type Item = T;
fn next(&mut self) -> Option<T> {
if self.0 < self.1 {
let v = self.0.clone();
self.0 = self.0.add(&self.2);
Some(v)
} else {
None
}
}
}
fn get_step_range<T>(from: T, to: T, step: T) -> Result<StepRange<T>, Box<EvalAltResult>>
where
for<'a> &'a T: Add<&'a T, Output = T>,
T: Variant + Clone + PartialOrd,
{
Ok(StepRange::<T>(from, to, step))
}
#[cfg(not(feature = "only_i32"))]
#[cfg(not(feature = "only_i64"))]
macro_rules! reg_range {
($lib:expr, $x:expr, $( $y:ty ),*) => (
$(
$lib.set_iterator::<Range<$y>>();
let hash = $lib.set_fn_2($x, get_range::<$y>);
$lib.update_fn_metadata(hash, [
concat!("from: ", stringify!($y)),
concat!("to: ", stringify!($y)),
concat!("Iterator<Item=", stringify!($y), ">")
]);
)*
)
}
#[cfg(not(feature = "only_i32"))]
#[cfg(not(feature = "only_i64"))]
macro_rules! reg_step {
($lib:expr, $x:expr, $( $y:ty ),*) => (
$(
$lib.set_iterator::<StepRange<$y>>();
let hash = $lib.set_fn_3($x, get_step_range::<$y>);
$lib.update_fn_metadata(hash, [
concat!("from: ", stringify!($y)),
concat!("to: ", stringify!($y)),
concat!("step: ", stringify!($y)), concat!("Iterator<Item=", stringify!($y), ">")
]);
)*
)
}
def_package!(crate:BasicIteratorPackage:"Basic range iterators.", lib, {
lib.set_iterator::<Range<INT>>();
let hash = lib.set_fn_2("range", get_range::<INT>);
lib.update_fn_metadata(hash, ["from: INT", "to: INT", "Iterator<Item=INT>"]);
#[cfg(not(feature = "only_i32"))]
#[cfg(not(feature = "only_i64"))]
{
reg_range!(lib, "range", i8, u8, i16, u16, i32, i64, u32, u64);
if cfg!(not(target_arch = "wasm32")) {
reg_range!(lib, "range", i128, u128);
}
}
lib.set_iterator::<StepRange<INT>>();
let hash = lib.set_fn_3("range", get_step_range::<INT>);
lib.update_fn_metadata(hash, ["from: INT", "to: INT", "step: INT", "Iterator<Item=INT>"]);
#[cfg(not(feature = "only_i32"))]
#[cfg(not(feature = "only_i64"))]
{
reg_step!(lib, "range", i8, u8, i16, u16, i32, i64, u32, u64);
if cfg!(not(target_arch = "wasm32")) {
reg_step!(lib, "range", i128, u128);
}
}
});