Struct rusty_dumb_tools::calculator::DumbCalculator

pub struct DumbCalculator { /* private fields */ }

Implementations

impl DumbCalculator

a simple calculator that accepts input keys acting like a real calculator; it may task is the keep track of key presses and turn them into “calculation units”; it uses a crate::calc::DumbCalcProcessor to handle the actual calculation processing

for example:

use rusty_dumb_tools::calculator::DumbCalculator;
let mut calculator = DumbCalculator::new();
calculator.push("1").unwrap();
calculator.push(".").unwrap();
calculator.push("0").unwrap();
calculator.push("2").unwrap();
assert_eq!(calculator.get_display(), "1.02");
calculator.push("*").unwrap();
calculator.push("3").unwrap();
assert_eq!(calculator.get_display(), "3");
calculator.push("=").unwrap();
assert_eq!(calculator.get_display(), "3.06");

for a fuller sample code, please refer to the “calculator” sub-demo of crate::demo::run_demo

pub fn new_min() -> Self

create a new DumbCalculator instance with minimum feature (i.e. no undo etc)

pub fn new() -> Self

create a new DumbCalculator (with all the default features enabled)

pub fn new_with_settings(settings: DumbCalculatorSettings) -> Self

like DumbCalculator::new but with settings

pub fn push(&mut self, key: &str) -> Result<(), DumbError>

push a “key input”:

• a digit, including a “.”
• a bracket: “(”, “)”
• an operator accepted by crate::calc::DumbCalcProcessor::push like:
  • binary operators; e.g. “+”, “-”, “*”, “/”, etc
  • unary operators; e.g. “neg”, “sin”, “cos”, “tan”, etc
• a constant accepted by crate::calc::DumbCalcProcessor::push like “PI”, etc
• “=”

pub fn push_chars(&mut self, keys: &str) -> Result<(), DumbError>

like DumbCalculator::push but each characters of the input will be pushed individually one by one

pub fn undo(&mut self)

undo the last “key input” done by DumbCalculator::push, if undo is enabled

pub fn reset(&mut self)

reset the calculator

pub fn get_history(&self) -> Option<&[String]>

get history of the “key input”, if history is enabled

pub fn get_history_string(&self, better_symbols: bool) -> Option<String>

like DumbCalculator::get_history but returns a string instead

pub fn get_display(&self) -> String

get what to show on the calculator’s display

pub fn get_display_sized(&self, result_width: usize) -> String

get what to show on the calculator’s display, but with a fixed display width

pub fn get_last_operator(&self) -> Option<String>

pub fn count_opened_brackets(&self) -> u16