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use std::iter::zip;
use std::sync::Arc;
use crate::math::{
complex::Complex,
context::Context,
expression::Expression,
operation::Operation,
function::{Function, FunctionArgument, EmptyFunction}
};
#[derive(Default, Clone)]
pub struct ExpressionFunction {
expr: Expression,
name: String,
args: Vec<String>,
}
impl ExpressionFunction {
pub fn from_string(str: String, operations: &Vec<Operation>) -> Result<Self, ()> {
let str = str.replace(' ', "");
if let Some((lhs, expr)) = str.split_once('=') {
if let Some((name, a)) = lhs.split_once('(') {
let args: Vec<String> = a[0..a.len() - 1]
.split(',')
.map(|s| s.to_string())
.collect();
return Ok(Self {
expr: Expression::from_string(expr, operations),
name: name.to_string(),
args,
})
}
}
Err(())
}
pub fn name(&self) -> &str {
&self.name
}
pub fn content(&self) -> &str {
&self.expr.content()
}
}
impl Function for ExpressionFunction {
fn eval(&self, args: &FunctionArgument, ctx: &Context) -> Result<Complex, String> {
if args.len() == self.args.len() {
let mut nctx = ctx.clone();
let vargs = args.eval_args(ctx)?;
for (n, v) in zip(self.args.iter(), vargs.iter()) {
nctx.set_variable(n, *v)
}
nctx.set_function(self.name(), Arc::new(EmptyFunction {}));
self.expr.evaluate(&nctx)
} else {
Err(format!(
"{} takes {} parameters",
self.name,
self.args.len()
))
}
}
}
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