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use std::{env, fs, path::Path};
mod interpret;
mod lex;
mod parse;
use lex::lexer::Lexer;
use interpret::walker::Walker;
use parse::parser::Parser;
use std::io::{self, Write};
fn main() {
let args: Vec<String> = env::args().collect();
if let Some(filename) = args.get(1) {
file(filename)
} else {
repl()
}
}
fn file(filename: impl AsRef<Path>) {
let contents = fs::read_to_string(filename).expect("Failed reading file.");
let lexer = Lexer::new(&contents);
let mut parser = Parser::new(lexer);
let node = parser.parse().expect("Failed parsing.");
let mut walker = Walker::new();
walker.walk(&node);
}
fn repl() {
const PROMPT: &'static str = "🐇: ";
let mut walker = Walker::new();
let mut input_buffer;
loop {
print!("{}", PROMPT);
io::stdout().flush().expect("Failed flushing.");
input_buffer = String::new();
io::stdin()
.read_line(&mut input_buffer)
.expect("Failed reading input.");
let lexer = Lexer::new(input_buffer.trim());
let mut parser = Parser::new(lexer);
let node = parser.expression().expect("Failed parsing.");
let result = walker.walk_expression(&node).expect("Failed interpreting.");
println!("🥕: {:?}\n", result);
}
}
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