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mod input;
pub mod ui;
#[derive(Default)]
pub struct Calculator {
stack: Vec<f64>,
input_buffer: String,
}
impl Calculator {
fn op(&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),
});
}
}
pub enum Operator {
Add,
Sub,
Mul,
Div,
Exp,
}
impl Operator {
pub 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)),
}
}
}
pub struct ParseOperatorError(char);
enum Function {
Sin,
Cos,
Tan,
}
impl Function {
fn parse(s: &str) -> Result<Self, ParseFunctionError> {
match s {
"sin" => Ok(Self::Sin),
"cos" => Ok(Self::Cos),
"tan" => Ok(Self::Tan),
_ => Err(ParseFunctionError(s.to_string())),
}
}
fn func(&self) -> impl Fn(f64) -> f64 {
match self {
Self::Sin => |f: f64| f.sin(),
Self::Cos => |f: f64| f.cos(),
Self::Tan => |f: f64| f.tan(),
}
}
}
struct ParseFunctionError(String);
pub enum Signal {
None,
Exit,
}
|