nexus_lib/evaluator/
builtins.rs

1use std::io;
2
3use crate::lexer::tokens::Literal;
4
5use super::objects::Object;
6
7#[derive(Debug, Clone)]
8pub enum BuiltinFunc {
9    Print(Print),
10    Input(Input),
11}
12
13impl BuiltinFunc {
14    pub fn get_ret_val(&self) -> Option<Object> {
15        match self {
16            BuiltinFunc::Print(_) => None,
17            BuiltinFunc::Input(input) => Some(Object::Lit(input.ret_val.clone())),
18        }
19    }
20}
21
22#[derive(Debug, Clone)]
23pub struct Input {
24    // Always a string literal
25    // Use Literal instead of Object
26    // to avoid using a Box
27    ret_val: Literal,
28}
29
30impl Input {
31    pub fn input(print_val: Option<String>) -> Self {
32        let mut input = String::new();
33
34        if let Some(val) = print_val {
35            println!("{}", val)
36        }
37
38        // Read a line from the standard input and handle potential errors
39        match io::stdin().read_line(&mut input) {
40            Ok(_) => (),
41            Err(error) => eprintln!("Error reading input: {}", error),
42        }
43        Self {
44            ret_val: Literal::Str(input),
45        }
46    }
47}
48
49#[derive(Debug, Clone)]
50pub struct Print;
51
52impl Print {
53    pub fn print_val(val: Option<Object>) -> Self {
54        println!(
55            "{}",
56            match val {
57                Some(val) => val.to_string(),
58                None => "".into(),
59            }
60        );
61        Self {}
62    }
63}
nexus_lib/evaluator/builtins.rs

nexus_lib/evaluator/
builtins.rs
