simple_expressions/types/
function.rs

1use crate::types::error::{Error, Result};
2use crate::types::object::Object;
3use crate::types::value::Value;
4use std::any::Any;
5use std::rc::Rc;
6
7pub type Callable = Rc<dyn Fn(&[Value]) -> Result<Value>>;
8
9pub fn new(callable: Callable) -> Value {
10    Value::Object(Rc::new(Function::new(callable)))
11}
12
13pub struct Function {
14    callable: Callable,
15}
16
17impl Function {
18    pub fn new(callable: Callable) -> Self {
19        Self { callable }
20    }
21}
22
23impl Object for Function {
24    fn type_name(&self) -> &'static str {
25        "function"
26    }
27
28    fn call(&self, args: &[Value]) -> Result<Value> {
29        self.callable.as_ref()(args)
30    }
31
32    fn as_any(&self) -> &dyn Any {
33        self
34    }
35
36    fn as_any_mut(&mut self) -> &mut dyn Any {
37        self
38    }
39}
40
41pub fn method0<F>(f: F) -> Value
42where
43    F: Fn() -> Result<Value> + 'static,
44{
45    new(Rc::new(move |args: &[Value]| {
46        if !args.is_empty() {
47            return Err(Error::EvaluationFailed("expected 0 args".into()));
48        }
49        f()
50    }))
51}
52
53pub fn method1<F>(f: F) -> Value
54where
55    F: Fn(&Value) -> Result<Value> + 'static,
56{
57    new(Rc::new(move |args: &[Value]| {
58        if args.len() != 1 {
59            return Err(Error::EvaluationFailed("expected 1 arg".into()));
60        }
61        f(&args[0])
62    }))
63}
simple_expressions/types/function.rs

simple_expressions/types/
function.rs
