mica-std 0.5.0

The standard library of Mica, a simple, user-friendly, embeddable scripting language
Documentation 
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//! `CountUp` and `CountDown` iterators.

use mica_hl::builtin_traits::iterator;
use mica_hl::{Engine, TypeBuilder, UserData};

struct CountUp {
   current: i64,
   max: i64,
   step: i64,
}

impl CountUp {
   fn with_step(min: i64, max: i64, step: i64) -> Self {
      Self {
         current: min,
         max,
         step,
      }
   }

   fn new(min: i64, max: i64) -> Self {
      Self::with_step(min, max, 1)
   }

   fn has_next(&self) -> bool {
      self.current <= self.max
   }

   fn next(&mut self) -> i64 {
      let i = self.current;
      self.current += self.step;
      i
   }
}

impl UserData for CountUp {}

struct CountDown {
   current: i64,
   min: i64,
   step: i64,
}

impl CountDown {
   fn with_step(max: i64, min: i64, step: i64) -> Self {
      Self {
         current: max,
         min,
         step,
      }
   }

   fn new(max: i64, min: i64) -> Self {
      Self::with_step(max, min, 1)
   }

   fn has_next(&self) -> bool {
      self.current >= self.min
   }

   fn next(&mut self) -> i64 {
      let i = self.current;
      self.current -= self.step;
      i
   }
}

impl UserData for CountDown {}

pub(crate) fn load_counters(engine: &mut Engine) -> Result<(), mica_hl::Error> {
   engine.add_type(
      TypeBuilder::<CountUp>::new("CountUp")
         .add_constructor("new", |ctor| {
            move |min, max, step| ctor.construct(CountUp::with_step(min, max, step))
         })
         .add_constructor("new", |ctor| {
            move |min, max| ctor.construct(CountUp::new(min, max))
         })
         .add_builtin_trait_function(iterator::HasNext, CountUp::has_next)
         .add_builtin_trait_function(iterator::Next, CountUp::next),
   )?;

   engine.add_type(
      TypeBuilder::<CountDown>::new("CountDown")
         .add_constructor("new", |ctor| {
            move |max, min, step| ctor.construct(CountDown::with_step(max, min, step))
         })
         .add_constructor("new", |ctor| {
            move |max, min| ctor.construct(CountDown::new(max, min))
         })
         .add_builtin_trait_function(iterator::HasNext, CountDown::has_next)
         .add_builtin_trait_function(iterator::Next, CountDown::next),
   )?;

   engine.start("mstd-counters.mi", include_str!("counters.mi"))?.trampoline()?;

   Ok(())
}