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use std::{
fs::read_to_string,
io::{BufRead, BufReader, Read, Write},
};
use crate::{
ast::Value,
lambda::{eval, eval_all, Environment},
parser::parse,
};
pub fn eval_file(file_name: &str) -> String {
let content = read_to_string(file_name).unwrap();
let values = parse(&content.to_string());
eval_all(&values)
.iter()
.map(|v| v.to_string())
.collect::<Vec<String>>()
.join(" ")
}
pub fn repl<I: Read, O: Write>(inp: &mut I, outp: &mut O) {
let mut env = Environment::new();
let mut reader = BufReader::new(inp);
loop {
let mut input = String::new();
write!(outp, "> ").unwrap();
outp.flush().unwrap();
match reader.read_line(&mut input) {
Ok(0) => break,
Ok(_) => (),
Err(e) => {
writeln!(outp, "{}", e).unwrap();
break;
}
}
let values = parse(&input);
let results = values
.iter()
.map(|v| eval(v, &mut env))
.collect::<Vec<Value>>();
for result in results {
writeln!(outp, "{}", result).unwrap();
outp.flush().unwrap();
}
}
}
|
