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extern crate num;
use num::{BigInt, FromPrimitive, ToPrimitive};
use crate::CONFIGURATION;
use crate::error::{
CalcError,
Math
};
pub fn autobalance_parens(input: &str) -> Result<String, CalcError> {
let mut balanced = String::from(input);
let mut left_parens = 0;
let mut right_parens = 0;
for letter in input.chars() {
if letter == '(' {
left_parens += 1;
} else if letter == ')' {
right_parens += 1;
}
}
if left_parens > right_parens {
let extras = ")".repeat(left_parens - right_parens);
balanced.push_str(&extras[..]);
Ok(balanced)
} else if left_parens < right_parens {
return Err(CalcError::Syntax("Mismatched parentheses!".into()))
} else {
Ok(balanced)
}
}
fn radix_fmt(number: f64, obase: usize) -> Result<String, CalcError> {
if obase > 36 {
return Err(CalcError::Math(Math::UnknownBase));
}
let table: Vec<char> = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ".chars().collect();
// format integral part of float
let mut integral = BigInt::from_f64(number.abs().trunc()).unwrap();
let mut obase_int = String::new();
let obaseb = BigInt::from_usize(obase).unwrap();
while &integral >= &obaseb {
obase_int.push(table[(&integral % &obaseb).to_usize().unwrap()]);
integral /= &obaseb;
}
obase_int.push(table[integral.to_usize().unwrap()]);
if number.is_sign_negative() {
obase_int.push('-');
}
let obase_int = obase_int.chars().rev().collect::<String>();
// format fractional part of float
let mut fract = number.abs().fract();
let mut obase_fract = String::new();
let mut i = 0;
loop {
fract *= obase as f64;
obase_fract.push(table[fract.trunc() as usize]);
i += 1;
if fract.fract() == 0. || i >= CONFIGURATION.fix {
break;
}
fract = fract.fract();
}
Ok(format!("{}.{}", obase_int, obase_fract))
}
fn thousand_sep(inp: &str) -> String {
let mut result_string = String::new();
for (i,c) in inp.to_string().chars().rev().enumerate() {
if i % 3 == 0 && i != 0 && c.to_string() != "-" {
result_string.push(',');
}
result_string.push(c)
}
result_string.chars().rev().collect::<String>()
}
pub fn pprint(ans: f64) {
let ans_string = radix_fmt(ans, CONFIGURATION.base).unwrap();
let ans_vector: Vec<&str> = ans_string.split(".").collect();
match ans_vector.len() {
1 => println!("{:>10}", thousand_sep(ans_vector[0])),
2 => println!("{:>10}.{}", thousand_sep(ans_vector[0]),ans_vector[1]),
_ => unreachable!("N-nani?!")
}
}
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