Alex Bethel
dc5ef63fef
We have much better spanned expression support, so now we get to show it off!
51 lines
1.5 KiB
Rust
51 lines
1.5 KiB
Rust
use logos::Source;
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use rustyline::Editor;
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use crate::{interpret::ExecEnv, parser::Parser};
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pub fn repl() {
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let mut rl = Editor::<()>::new();
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let mut env = ExecEnv::new();
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loop {
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let readline = rl.readline(":: ");
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match readline {
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Ok(line) => {
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if &line == "exit" {
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println!("bye");
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break;
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}
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let mut parser = Parser::new(&line);
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let value = parser.init().and_then(|ast| {
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println!("{:?}", &ast);
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env.eval_stmts(&ast)
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});
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if let Err(e) = value {
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println!(
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"Error `{:?}` occurred at span: {:?} = `{:?}`",
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e.kind,
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e.span.clone(),
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line.slice(e.span.clone())
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);
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println!(" | {}", line);
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println!(
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" {}{}-- Here",
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" ".repeat(e.span.start),
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"^".repeat((e.span.end - e.span.start).max(1))
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);
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}
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}
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Err(rustyline::error::ReadlineError::Eof) => {
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println!("bye");
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break;
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}
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Err(rustyline::error::ReadlineError::Interrupted) => (),
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Err(e) => {
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println!("Error: {:?}", e);
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break;
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}
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}
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}
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}
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