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use std::f64::consts::{E, PI};
mod input;
pub mod ui;
#[derive(Default)]
pub struct Calculator {
stack: Vec<f64>,
input_buffer: String,
}
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),
});
}
}
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 Function {
DSin, // Sine (degrees)
DCos, // Cosine (degrees)
DTan, // Tangent (degrees)
RSin, // Sine (radians)
RCos, // Cosing (radians)
RTan, // Tangent (radians)
Deg, // Convert from radians to degrees
Rad, // Convert from degrees to radians
}
impl Function {
fn parse(s: &str) -> Result<Self, ParseFunctionError> {
match s {
"dsin" => Ok(Self::DSin),
"dcos" => Ok(Self::DCos),
"dtan" => Ok(Self::DTan),
"rsin" => Ok(Self::RSin),
"rcos" => Ok(Self::RCos),
"rtan" => Ok(Self::RTan),
"deg" => Ok(Self::Deg),
"rad" => Ok(Self::Rad),
_ => Err(ParseFunctionError(s.to_string())),
}
}
fn call_on(&self, f: f64) -> f64 {
match self {
Self::DSin => f.to_radians().sin(),
Self::DCos => f.to_radians().cos(),
Self::DTan => f.to_radians().tan(),
Self::RSin => f.sin(),
Self::RCos => f.cos(),
Self::RTan => f.tan(),
Self::Deg => f.to_degrees(),
Self::Rad => f.to_radians(),
}
}
}
struct ParseFunctionError(String);
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,
}
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