diff options
| -rw-r--r-- | Cargo.lock | 530 | ||||
| -rw-r--r-- | Cargo.toml | 9 | ||||
| -rw-r--r-- | DESIGN.md | 83 | ||||
| -rw-r--r-- | README.md | 4 | ||||
| -rw-r--r-- | src/main.rs | 131 |
5 files changed, 757 insertions, 0 deletions
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+++ b/DESIGN.md @@ -0,0 +1,83 @@ +# rp Design Doc + + +## Stages + +The plan is to start out rp as a single file prototype, and then, once the basics are in place, start expanding it. + + +### Architechture + +The interpter is planned to be a stack-supplied state machine, such that all of the input states are stored on the interpreter struct. This is so that key-by-key commands can be handled directly by the interpreter, at least at first. (If this proves to be -too- complicated to implement, an input editor might be investigated, but I feel confident so far) + +Eventually, there will be a TUI display. This I hope to write as a function of an immutable borrow of the stack machine. + + +### Mockups + + +Main screen, shown all of the time +``` +/---------------------------\ +| 0.#: 123 | +| 1.#: 456 | +| >2.#: 789_ | +| 3.$: [This is a string] | +| | +| C-h: Help | +| C-r: Registers | +| _: Change Sign | +\---------------------------/ +``` + + +Registers screen, shown in slot two if enabled + +``` +/--------------------------\ +| Registers: | +| a.@: {1,[abc], 2} | +| b.#: 3 | +| c.$: [This is a string] | +| i.$: [1+] | +| g.F: f(x)=[x 1 +] | +| | +\--------------------------/ +``` + +Help screen, shown below any other screens, if enabled + +``` +/--------------------------\ +| Help: | +| 1: Arithmetic | +| 2: Trig | +| 3: Graphing | +| 4: Search | +| q: Exit Help | +| | +\--------------------------/ + +``` + + + + + + + + + + + + + + + + + + + + + + diff --git a/README.md b/README.md new file mode 100644 index 0000000..f0aa21a --- /dev/null +++ b/README.md @@ -0,0 +1,4 @@ +# rp: Reverse Polish (calculator) + +A stack-based TUI calculator, inspire by dc and the HP-48 calculator. + diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..bd5053e --- /dev/null +++ b/src/main.rs @@ -0,0 +1,131 @@ +// use std::env; // TODO: Get args from here +use std::collections::HashMap; +use rust_decimal::prelude::*; +use rust_decimal_macros::dec; + +#[derive(Debug)] +enum Value { + Str(String), + Num(Decimal), +} + +enum Mode { + Integer, + Decimal, + Str, + Command +} + + +fn main() { + let mut state = RPState { + registers: HashMap::new(), + stack: Vec::new(), + mode: Mode::Command, + wip_str: String::from(""), + num: dec!(0.0), + decimal_offset: dec!(1), + }; + + let result = eval(String::from("123 456 7.89+"), &mut state); + match result { + Ok(()) => println!("{:?}", state.stack), + Err(msg) => println!("Error: {}", msg), + } +} + +const RADIX: u32 = 10; +const INTEGER_RADIX: Decimal = dec!(10); + +fn to_decimal(input: u32) -> Decimal { + <u32 as Into<Decimal>>::into(input) +} + + +struct RPState { + registers: HashMap<String, Value>, + stack: Vec<Value>, + mode: Mode, + wip_str: String, + num: Decimal, + decimal_offset: Decimal +} + +fn command(c: char, state: &mut RPState) -> Result<(), String> { + if c.is_digit(RADIX) { + state.mode = Mode::Integer; + state.num = dec!(0); + state.num += to_decimal(c.to_digit(10).ok_or_else(|| format!("{} isn't a digit", c))?); + Ok(()) + } else if c == ' ' { + // do nothing + Ok(()) + } else if c == '+' { + + let a = state.stack.pop().ok_or_else(|| "Data underflow!")?; + let b = state.stack.pop().ok_or_else(|| "Data underflow!")?; + + match (a, b) { + (Value::Num(c), Value::Num(d)) => { + state.stack.push(Value::Num(c + d)); + } + + _ => return Err("Invalid operation + on non-numbers!".to_string()) + } + Ok(()) + } else { + panic!("{} isn't implemented yet!", c) + } +} + +fn integer(c: char, state: &mut RPState) -> Result<(), String> { + if c.is_digit(RADIX) { + state.num *= INTEGER_RADIX; + state.num += to_decimal(c.to_digit(10).unwrap()); + } else if c == '.' { + state.decimal_offset = dec!(1); + state.mode = Mode::Decimal; + } + else { + state.stack.push(Value::Num(state.num)); + state.mode = Mode::Command; + return command(c, state); + } + return Ok(()); +} + +fn decimal(c: char, state: &mut RPState) -> Result<(), String> { + if c.is_digit(RADIX) { + state.decimal_offset *= dec!(0.1); + state.num += to_decimal(c.to_digit(10).unwrap()) * state.decimal_offset; + } else { + state.stack.push(Value::Num(state.num)); + state.mode = Mode::Command; + return command(c, state); + } + return Ok(()); +} + +fn eval(input: String, state: &mut RPState) -> Result<(), String> { + for (_cpos, c) in input.char_indices() { + let res = match state.mode { + Mode::Command => command(c, state), + Mode::Integer => integer(c, state), + Mode::Decimal => decimal(c, state), + Mode::Str => { + panic!("Strings not implemented yet"); + } + }; + if res.is_err() { + return res + } + } + match state.mode { + Mode::Integer | Mode::Decimal => { + state.stack.push(Value::Num(state.num)); + state.mode = Mode::Command; + }, + _ => {} + }; + return Ok(()); +} |