Command line processsing, debug options

This commit is contained in:
Dane Johnson 2022-06-01 14:18:50 -05:00
parent 03cf0974de
commit 2e40afb9b5
4 changed files with 240 additions and 15 deletions

205
rust/Cargo.lock generated
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@ -2,13 +2,125 @@
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@ -54,8 +190,77 @@ dependencies = [
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@ -1,5 +1,6 @@
[package]
name = "deelang"
authors = ["Dane Johnson"]
version = "0.1.0"
edition = "2021"
@ -7,3 +8,4 @@ edition = "2021"
[dependencies]
peg = "0.8.0"
clap = { version = "3.1.18", features = ["derive"] }

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@ -1,36 +1,55 @@
mod parser;
mod evaluator;
use clap::Parser;
use std::io;
use std::io::prelude::*;
use std::env;
use std::fs::File;
use std::path::PathBuf;
fn repl() {
#[derive(Parser, Debug)]
#[clap(author, version, about = "Interpreter for Deelang")]
struct Cli {
#[clap(help="Specify a file to run")]
file: Option<PathBuf>,
#[clap(short, long, help="Only parse, do not evaluate")]
parse_only: bool,
}
fn repl(cli: &Cli) {
loop {
let mut line = String::new();
io::stdin().read_line(&mut line).unwrap();
let tree = parser::parse_stmt(&line);
match &tree {
parser::Stmt::ReplPrint(expr) => println!("{}", evaluator::eval(expr)),
_ => (),
};
if cli.parse_only {
println!("{:#?}", tree);
} else {
match &tree {
parser::Stmt::ReplPrint(expr) =>
println!("{}", evaluator::eval(expr)),
_ => todo!(),
}
}
}
}
fn script(filename: &str) {
let mut file = File::open(filename).expect("Could not read file");
fn script(cli: &Cli) {
let mut file = File::open(cli.file.as_ref().unwrap()).expect("Could not read file");
let mut prgm = String::new();
file.read_to_string(&mut prgm).unwrap();
let tree = parser::parse(&prgm);
println!("{:#?}", tree);
if cli.parse_only {
println!("{:#?}", tree);
} else {
todo!();
}
}
fn main() {
let args: Vec<String> = env::args().collect();
if args.len() == 1 {
repl();
} else {
script(&args[1]);
let cli = Cli::parse();
match cli.file {
None => repl(&cli),
Some(_) => script(&cli),
}
}

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@ -160,7 +160,6 @@ fn preprocess(input: &str) -> String {
output.push_str(line.trim());
output.push('\n');
}
println!("{}", output);
output
}