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use crate::{complex::Complex, context::Context};
pub struct FunctionArgument {
args : Vec<Complex>,
}
impl FunctionArgument {
pub fn new(args: Vec<Complex>) -> Self {
Self { args }
}
pub fn get(&self, i : usize) -> Complex {
self.args[i]
}
pub fn len(&self) -> usize {
self.args.len()
}
pub fn is_empty(&self) -> bool {
self.args.len() == 0
}
pub fn data(&self) -> &[Complex] {
&self.args
}
}
pub trait Function {
fn eval(&self, args: FunctionArgument, ctx: &Context) -> Result<Complex, String>;
}
#[macro_export]
macro_rules! functions {
{$($x:expr => $y:expr), *} => {
{
let mut h : HashMap<String, Arc<dyn Function>> = HashMap::new();
$(
h.insert($x.to_string(), Arc::new($y));
)*
h
}
};
}
// Some default implementations
impl<T> Function for T
where
T: Fn(Complex) -> Complex,
{
fn eval(&self, args: FunctionArgument, _ctx: &Context) -> Result<Complex, String> {
if args.len() == 1 {
Ok(self(args.get(0)))
} else {
Err("too many arguments".to_string())
}
}
}
pub struct EmptyFunction {}
impl Function for EmptyFunction {
fn eval(&self, _args: FunctionArgument, _ctx: &Context) -> Result<Complex, String> {
Err("function not implemented in this scope".to_string())
}
}
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