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use std::{
f64::consts::{E, PI},
fmt::{self, Display, Formatter},
};
mod function;
mod input;
pub mod ui;
pub use function::Function;
#[derive(Default)]
pub struct Calculator {
stack: Vec<f64>,
input_buffer: String,
angle_mode: AngleMode,
}
impl Calculator {
fn perform_operation(&mut self, op: Operator) {
let rhs = match self.stack.pop() {
Some(f) => f,
None => {
return;
}
};
let lhs = match self.stack.pop() {
Some(f) => f,
None => {
return;
}
};
self.stack.push(match op {
Operator::Add => lhs + rhs,
Operator::Sub => lhs - rhs,
Operator::Mul => lhs * rhs,
Operator::Div => lhs / rhs,
Operator::Exp => lhs.powf(rhs),
});
}
}
#[derive(Default, Copy, Clone, PartialEq)]
pub enum AngleMode {
#[default]
Degrees,
Radians,
}
impl AngleMode {
fn toggle(&self) -> Self {
match self {
Self::Degrees => Self::Radians,
Self::Radians => Self::Degrees,
}
}
}
impl Display for AngleMode {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(
f,
"{}",
match self {
Self::Degrees => "deg",
Self::Radians => "rad",
}
)
}
}
enum Operator {
Add,
Sub,
Mul,
Div,
Exp,
}
impl Operator {
fn parse(c: char) -> Result<Self, ParseOperatorError> {
match c {
'+' => Ok(Self::Add),
'-' => Ok(Self::Sub),
'*' => Ok(Self::Mul),
'/' => Ok(Self::Div),
'^' => Ok(Self::Exp),
_ => Err(ParseOperatorError(c)),
}
}
}
struct ParseOperatorError(char);
enum Constant {
Pi, // Archimedes’ constant (π)
E, // Euler's number (e)
}
impl Constant {
fn parse(s: &str) -> Result<Self, ParseConstantError> {
match s {
"pi" => Ok(Self::Pi),
"e" => Ok(Self::E),
_ => Err(ParseConstantError(s.to_string())),
}
}
fn value(&self) -> f64 {
match self {
Self::Pi => PI,
Self::E => E,
}
}
}
struct ParseConstantError(String);
pub enum Signal {
None,
Exit,
}
|