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use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
use crate::{Calculator, Constant, Function, Operator, Signal};
impl Calculator {
pub fn handle_input(&mut self, key: KeyEvent) -> Signal {
match key.modifiers {
KeyModifiers::CONTROL => match key.code {
KeyCode::Char('c') => {
return Signal::Exit;
}
_ => {}
},
KeyModifiers::SHIFT => match key.code {
KeyCode::Char('Q') => {
return Signal::Exit;
}
KeyCode::Char('J' | 'K') => self.swap(),
KeyCode::Char('D') => {
self.input_buffer = String::new();
}
KeyCode::Char('C') => self.clear(),
KeyCode::Char('A') => {
self.angle_mode = self.angle_mode.toggle();
}
KeyCode::Char('N') => {
if self.input_buffer.len() > 0 {
if let Ok(f) = self.input_buffer.parse::<f64>() {
self.input_buffer = format!("{}", -f);
}
} else if let Some(v) = self.stack.pop() {
self.stack.push(-v);
}
}
_ => {}
},
KeyModifiers::NONE => match key.code {
KeyCode::Char(c) => self.push_to_buffer(c),
KeyCode::Backspace => {
self.input_buffer.pop();
}
KeyCode::Enter => {
if let Ok(func) = Function::parse(&self.input_buffer) {
if let Some(val) = self.stack.pop() {
self.stack.push(func.call(val, self.angle_mode));
}
} else if let Ok(c) = Constant::parse(&self.input_buffer) {
self.stack.push(c.value());
} else if let Ok(bu) = self.input_buffer.parse::<f64>() {
self.stack.push(bu);
}
self.input_buffer = String::new();
}
_ => {}
},
_ => {}
}
return Signal::None;
}
fn push_to_buffer(&mut self, c: char) {
if c == '.' && !self.input_buffer.contains('.') {
if self.input_buffer.len() == 0 {
self.input_buffer.push('0');
}
self.input_buffer.push(c);
} else if let Ok(op) = Operator::parse(c) {
if let Ok(c) = Constant::parse(&self.input_buffer) {
self.stack.push(c.value());
} else if let Ok(f) = self.input_buffer.parse::<f64>() {
self.stack.push(f);
}
self.input_buffer = String::new();
self.perform_operation(op);
} else {
self.input_buffer.push(c);
}
}
fn swap(&mut self) {
if let Some(st) = self.stack.pop() {
if let Ok(bu) = self.input_buffer.parse::<f64>() {
self.stack.push(bu);
}
self.input_buffer = format!("{}", st);
}
}
// Clear stack and input buffer.
fn clear(&mut self) {
self.input_buffer = String::new();
self.stack = Vec::new();
}
}
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