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use std::sync::{
Arc,
LazyLock,
Mutex,
atomic::{
AtomicBool,
Ordering,
},
};
use fend_core::{
Context,
Interrupt,
evaluate_with_interrupt,
};
use mlua::prelude::*;
use crate::lenses::{
Cache,
Entries,
Entry,
Lense,
};
static CTX: LazyLock<Mutex<Context>> = LazyLock::new(|| {
let mut ctx = Context::new();
ctx.use_coulomb_and_farad();
Mutex::new(ctx)
});
#[derive(Default)]
pub struct Calculator {
should_interrupt: AtomicBool,
}
impl Lense for Calculator {
const NAME: &str = "Calculator";
const PREFIX: Option<&'static str> = Some("#");
fn init() -> std::sync::Arc<Self> {
Arc::new(Calculator::default())
}
#[inline]
fn set_cache(&self, _: Cache) {}
#[inline]
fn get_cache(&self) -> Cache {
Cache::Stale
}
#[inline]
fn set_interrupt(&self, interrupt: bool) {
self.should_interrupt.store(interrupt, Ordering::Relaxed);
}
#[inline]
fn get_interrupt(&self) -> bool {
self.should_interrupt.load(Ordering::Relaxed)
}
fn entries(&self, _: &Lua, input: &str) -> Result<Entries, anyhow::Error> {
let result = match evaluate_with_interrupt(
input.trim(),
&mut CTX.lock().expect("Failed to acquire Fend context lock"),
self,
) {
Ok(result) => result.get_main_result().to_string(),
Err(err) => err,
};
Ok(if result.is_empty() {
Entries::None
} else {
Entries::Single(Entry {
message: result,
exec: None,
})
})
}
#[inline]
fn filter(&self, entries: Entries, _: &str) -> Entries {
entries
}
}
impl Interrupt for Calculator {
fn should_interrupt(&self) -> bool {
self.should_interrupt.load(Ordering::Relaxed)
}
}
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