47 lines
1.4 KiB
Rust
47 lines
1.4 KiB
Rust
use std::{rc::Rc, cell::RefCell, fs};
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use complexpr::{eval::Environment, interpreter::interpret, value::Value, stdlib};
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use rustyline::{self, error::ReadlineError};
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const C_RESET: &str = "\x1b[0m";
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const C_BLUE: &str = "\x1b[94m";
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const PROMPT: &str = "\x1b[94m>> \x1b[0m";
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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let args: Vec<String> = std::env::args().collect();
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if args.len() == 2 {
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let fname = &args[1];
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let src = fs::read_to_string(fname)?;
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let res = interpret(&src, Some(fname.into()), None, false);
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if let Err(e) = res {
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println!("{}", e);
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}
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} else {
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repl()?;
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}
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Ok(())
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}
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fn repl() -> Result<(), Box<dyn std::error::Error>> {
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println!("Press {}Ctrl+D{} to exit.", C_BLUE, C_RESET);
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let mut rl = rustyline::Editor::<()>::new()?;
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let env = Rc::new(RefCell::new(Environment::new()));
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stdlib::load(&mut env.borrow_mut());
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loop {
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let readline = rl.readline(PROMPT);
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match readline {
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Ok(line) => {
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let result = interpret(&line, None, Some(env.clone()), true);
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match result {
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Ok(Value::Nil) => (),
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Ok(value) => println!("{}", value.repr()),
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Err(e) => println!("{}", e)
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}
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}
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Err(ReadlineError::Eof) => break,
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Err(_) => (),
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}
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}
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Ok(())
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}
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