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Add some comments to main.rs

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This commit is contained in:
Richard Feldman 2019-06-14 00:05:17 -04:00
parent 7165f55d6e
commit 32f19428ac
1 changed files with 12 additions and 3 deletions
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15
cli/src/main.rs
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@ -29,27 +29,35 @@ fn process_task(evaluated: Evaluated) -> std::io::Result<()> {
ApplyVariant(name, Some(mut vals)) => {
match name.as_str() {
"Echo" => {
let string_to_echo = match vals.pop() {
// Extract the string from the Echo variant.
let string_to_be_displayed = match vals.pop() {
Some(Str(payload)) => payload,
Some(EvalError(err)) => { panic!("RUNTIME ERROR in Echo: {}", format!("{}", err)); },
Some(val) => { panic!("TYPE MISMATCH in Echo: {}", format!("{}", val)); },
None => { panic!("TYPE MISMATCH in Echo: None"); }
};
// Print the string to the console, since that's what Echo does!
println!("{}", string_to_be_displayed);
// Continue with the callback.
let callback = vals.pop().unwrap();
println!("{}", string_to_echo);
process_task(call(callback, vec![Expr::EmptyRecord]))
},
"Read" => {
let callback = vals.pop().unwrap();
// Read a line from from stdin, since that's what Read does!
let mut input = String::new();
io::stdin().read_line(&mut input)?;
// Continue with the callback.
let callback = vals.pop().unwrap();
process_task(call(callback, vec![Expr::Str(input.trim().to_string())]))
},
_ => {
// We don't recognize this variant, so display it and exit.
display_val(ApplyVariant(name, Some(vals)));
Ok(())
@ -57,6 +65,7 @@ fn process_task(evaluated: Evaluated) -> std::io::Result<()> {
}
},
output => {
// We don't recognize this value, so display it and exit.
display_val(output);
Ok(())