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/*
* eva - an easy to use calculator REPL similar to bc(1)
* Copyright (C) 2019 Akshay Oppiliappan <[email protected]>
*/
/* imports */
// std
use std::f64;
use std::path::PathBuf;
use std::fs::create_dir_all;
// modules
mod lex;
mod parse;
mod error;
mod format;
mod readline;
use crate::lex::*;
use crate::parse::*;
use crate::error::{ CalcError, handler };
use crate::format::*;
use crate::readline::*;
// extern crates
use rustyline::error::ReadlineError;
use clap::{Arg, App};
use lazy_static::lazy_static;
use directories::{ ProjectDirs, UserDirs };
/* end of imports */
struct Configuration {
radian_mode: bool,
fix: usize,
base: usize,
input: String
}
lazy_static! {
static ref CONFIGURATION: Configuration = parse_arguments();
}
fn main() {
if CONFIGURATION.input.len() > 0 {
// command mode //
let evaled = eval_math_expression(&CONFIGURATION.input[..], 0f64);
match evaled {
Ok(ans) => pprint(ans),
Err(e) => {
eprintln!("{}", handler(e));
std::process::exit(1);
},
};
} else {
// REPL mode //
// create fancy readline
let mut rl = create_readline();
// previous answer
let mut prev_ans = 0f64;
// handle history storage
let eva_dirs = ProjectDirs::from("com", "NerdyPepper", "eva").unwrap();
let eva_data_dir = eva_dirs.data_dir();
let mut history_path = PathBuf::from(eva_data_dir);
match create_dir_all(eva_data_dir) {
Ok(_) => history_path.push("history.txt"),
Err(_) => history_path = PathBuf::from(UserDirs::new().unwrap().home_dir()),
};
if rl.load_history(history_path.as_path()).is_err() {
println!("No previous history.")
};
// repl loop begins here
loop {
let readline = rl.readline("> ");
match readline {
Ok(line) => {
rl.add_history_entry(line.as_str());
let evaled = eval_math_expression(&line[..], prev_ans);
match evaled {
Ok(ans) => {
prev_ans = ans;
pprint(ans);
}
Err(e) => println!("{}", handler(e)),
};
},
Err(ReadlineError::Interrupted) => {
println!("CTRL-C");
break
},
Err(ReadlineError::Eof) => {
break
},
Err(err) => {
println!("Error: {:?}", err);
break
}
}
}
rl.save_history(history_path.as_path()).unwrap();
}
}
fn parse_arguments() -> Configuration {
let config = App::new(env!("CARGO_PKG_NAME"))
.version(env!("CARGO_PKG_VERSION"))
.author(env!("CARGO_PKG_AUTHORS"))
.about(env!("CARGO_PKG_DESCRIPTION"))
.arg(Arg::with_name("fix")
.short("f")
.long("fix")
.takes_value(true)
.value_name("FIX")
.help("set number of decimal places in the output"))
.arg(Arg::with_name("base")
.short("b")
.long("base")
.takes_value(true)
.value_name("RADIX")
.help("set the radix of calculation output (1 - 36)"))
.arg(Arg::with_name("INPUT")
.help("optional expression string to run eva in command mode")
.index(1))
.arg(Arg::with_name("radian")
.short("r")
.long("radian")
.help("set eva to radian mode"))
.get_matches();
let mut input = String::new();
if let Some(i) = config.value_of("INPUT") {
input.push_str(i);
};
Configuration {
radian_mode: config.is_present("radian"),
fix: config.value_of("fix")
.unwrap_or("10")
.parse()
.unwrap(),
base: config.value_of("base")
.unwrap_or("10")
.parse()
.unwrap(),
input,
}
}
pub fn eval_math_expression(input: &str, prev_ans: f64) -> Result<f64, CalcError> {
let input = input.trim();
let input = input.replace(" ", "");
if input.len() == 0 {
return Ok(0.)
}
let input = format::autobalance_parens(&input[..])?;
let lexed = lexer(&input[..], prev_ans)?;
let postfixed = to_postfix(lexed)?;
let evaled = eval_postfix(postfixed)?;
let evaled_fixed = format!("{:.*}", CONFIGURATION.fix, evaled).parse::<f64>().unwrap();
Ok(evaled_fixed)
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn basic_ops() {
let evaled = eval_math_expression("6*2 + 3 + 12 -3", 0f64).unwrap();
assert_eq!(24., evaled);
}
#[test]
fn trignometric_fns() {
let evaled = eval_math_expression("sin(30) + tan(45", 0f64).unwrap();
assert_eq!(1.5, evaled);
}
#[test]
fn brackets() {
let evaled = eval_math_expression("(((1 + 2 + 3) ^ 2 ) - 4)", 0f64).unwrap();
assert_eq!(32., evaled);
}
#[test]
fn floating_ops() {
let evaled = eval_math_expression("1.2816 + 1 + 1.2816/1.2", 0f64).unwrap();
assert_eq!(3.3496, evaled);
}
#[test]
fn inverse_trignometric_fns() {
let evaled = eval_math_expression("deg(asin(1) + acos(1))", 0f64).unwrap();
assert_eq!(90., evaled);
}
#[test]
fn prev_ans() {
let evaled = eval_math_expression("_ + 9", 9f64).unwrap();
assert_eq!(18.0, evaled);
}
}
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