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use std::{collections::HashMap, iter::zip};
use crate::{
commonsense_functions, commonsense_operations, functions,
complex::Complex,
context::Context,
expression::Expression,
operation::Operation,
function::{Function, FunctionArgument}
};
pub struct ExpressionFunction {
expr: Expression,
name: String,
args: Vec<String>,
}
impl ExpressionFunction {
pub fn from_string(str: String) -> Self {
let str = str.replace(' ', "");
let (lhs, expr) = str.split_once('=').unwrap();
let (name, a) = lhs.split_once('(').unwrap();
let args: Vec<String> = a[0..a.len() - 1]
.split(',')
.into_iter()
.map(|s| s.to_string())
.collect();
Self {
expr: Expression::from_string(expr),
name: name.to_string(),
args,
}
}
pub fn name(&self) -> &str {
&self.name
}
}
impl Function for ExpressionFunction {
fn eval(&self, args: FunctionArgument) -> Result<Complex, String> {
if args.len() == self.args.len() {
let mut vars = HashMap::new();
for (n, v) in zip(self.args.iter(), args.data().iter()) {
vars.insert(n.to_string(), v.clone());
}
let ctx = Context::new()
.with_variables(vars)
.with_functions(commonsense_functions! {})
.with_operations(commonsense_operations! {});
self.expr.evaluate(&ctx)
} else {
Err(format!(
"{} takes {} parameters",
self.name,
self.args.len()
))
}
}
}
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