sde_sim_rs/
func.rs

1use crate::filtration::ScenarioFiltration;
2use fasteval::{Compiler, Evaler, Instruction, Slab};
3use ordered_float::OrderedFloat;
4
5pub struct Function {
6    instruction: Instruction,
7    slab: Slab,
8    expr_str: String,
9}
10
11impl Clone for Function {
12    fn clone(&self) -> Self {
13        Self::new(&self.expr_str).expect("Failed to re-compile on clone")
14    }
15}
16
17impl Function {
18    pub fn new(expr_str: &str) -> Result<Self, String> {
19        let parser = fasteval::Parser::new();
20        let mut slab = Slab::new();
21        let expr = parser
22            .parse(expr_str, &mut slab.ps)
23            .map_err(|e| format!("Parse Error: {:?}", e))?;
24        let instruction = expr.from(&slab.ps).compile(&slab.ps, &mut slab.cs);
25        Ok(Self {
26            instruction,
27            slab,
28            expr_str: expr_str.to_string(),
29        })
30    }
31
32    pub fn eval(
33        &self,
34        t: OrderedFloat<f64>,
35        filtration: &mut ScenarioFiltration,
36    ) -> Result<f64, fasteval::Error> {
37        if t != filtration.cache.time {
38            filtration.refresh_cache(t);
39        }
40        self.instruction
41            .eval(&self.slab, &mut filtration.cache.values)
42    }
43}
sde_sim_rs/func.rs

sde_sim_rs/
func.rs
