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rpn(1): refactor to make code more efficient, readable, and maintainable

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This commit is contained in:
Emma Tebibyte 2024-08-24 17:22:02 -06:00
parent 150fa22f35
commit a0138be79e
Signed by untrusted user: emma
GPG Key ID: 06FA419A1698C270
1 changed files with 57 additions and 46 deletions
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103
src/rpn.rs
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@ -54,7 +54,7 @@ use CalcType::*;
extern crate sysexits; extern crate sysexits;
use sysexits::EX_DATAERR; use sysexits::{ EX_DATAERR, EX_IOERR };
#[cfg(target_os="openbsd")] use sysexits::EX_OSERR; #[cfg(target_os="openbsd")] use sysexits::EX_OSERR;
#[cfg(target_os="openbsd")] extern crate strerror; #[cfg(target_os="openbsd")] extern crate strerror;
@ -120,13 +120,18 @@ impl Display for CalcType {
#[derive(Debug, Clone)] #[derive(Debug, Clone)]
struct EvaluationError { struct EvaluationError {
message: String, message: String,
code: i32, code: ExitCode,
} }
/* I’m no math nerd but I want the highest possible approximation of 0.9 /* I’m no math nerd but I want the highest possible approximation of 0.9
* repeating and it seems this can give it to me */ * repeating and it seems this can give it to me */
const PRECISION_MOD: f64 = 0.9 + f64::EPSILON * 100.0; const PRECISION_MOD: f64 = 0.9 + f64::EPSILON * 100.0;
fn err(argv0: &String, e: std::io::Error, code: Option<u8>) -> ExitCode {
eprintln!("{}: {}", argv0, e.strerror());
ExitCode::from(code.unwrap_or(1 /* unknown error */))
}
fn eval( fn eval(
input: &str, input: &str,
initial_stack: VecDeque<f64>, initial_stack: VecDeque<f64>,
@ -153,12 +158,12 @@ fn eval(
Invalid(i) => { Invalid(i) => {
return Err(EvaluationError { return Err(EvaluationError {
message: format!("{}: Invalid token", i), message: format!("{}: Invalid token", i),
code: EX_DATAERR, code: ExitCode::from(EX_DATAERR),
}) })
}, },
op => { op => {
ops.push_back(op.clone()); ops.push_back(op.clone());
oper = true; oper = true; /* this is an operation */
let vals = ( let vals = (
stack.pop_back(), stack.pop_back(),