800d2ccde8
Change-Id: I8acc5b0d07b2c656f9bba76a6ddac6b9088ea563 Reviewed-on: https://cl.tvl.fyi/c/depot/+/2189 Reviewed-by: tazjin <mail@tazj.in> Tested-by: BuildkiteCI
43 lines
921 B
Rust
43 lines
921 B
Rust
use std::env;
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use std::fs;
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use std::io;
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use std::io::Write;
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use std::process;
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mod errors;
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mod interpreter;
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mod scanner;
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fn main() {
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let mut args = env::args();
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if args.len() > 2 {
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println!("Usage: rlox [script]");
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process::exit(1);
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} else if let Some(file) = args.nth(1) {
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run_file(&file);
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} else {
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run_prompt();
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}
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}
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// Run Lox code from a file and print results to stdout
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fn run_file(file: &str) {
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let contents = fs::read_to_string(file).expect("failed to read the input file");
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interpreter::run(&contents);
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}
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// Evaluate Lox code interactively in a shitty REPL.
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fn run_prompt() {
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let mut line = String::new();
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loop {
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print!("> ");
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io::stdout().flush().unwrap();
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io::stdin()
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.read_line(&mut line)
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.expect("failed to read user input");
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interpreter::run(&line);
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line.clear();
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}
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}
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