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now with much nicer user input interaction!

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This commit is contained in:
David Senk
2023-10-08 22:18:31 -04:00
parent a5e8e7db45
commit c7dfc926ed
3 changed files with 314 additions and 17 deletions
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299
Cargo.lock generated
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@@ -2,15 +2,314 @@
# It is not intended for manual editing.
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1
Cargo.toml
View File

@@ -7,3 +7,4 @@ edition = "2021"
[dependencies]
indoc = "2.0.4"
simple-repl = "0.1.4"

31
src/main.rs
View File

@@ -1,25 +1,15 @@
use rpn::RPN;
use std::io;
use std::io::Write;
use simple_repl::*;
fn main() {
println!("RPN Calculator (with FORTH)");
let mut rpn = RPN::new();
loop {
let mut input = String::new();
print!("> ");
io::stdout()
.flush()
.expect("flush to stdout should not fail");
io::stdin()
.read_line(&mut input)
.expect("failed to read line");
match rpn.eval(&input) {
//we do not want to exit if rpn.eval returns an error, we just want to print it for the user
//no need to use anything other than () for passthrough and error types
let mut eval = |input: &str|-> Result<EvalResult<()>, ()> {
match rpn.eval(input) {
Err(e) => println!("Failed: {e:?}"),
Ok(_) => {
println!("Current Stack: ");
@@ -28,5 +18,12 @@ fn main() {
}
}
}
}
//no need to have simple-repl do anything but loop forever with this application
Ok(EvalResult::Continue)
};
//simple-repl handles the loop for us
let _ = repl(&mut eval);
}