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Improved output.

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This commit is contained in:
PaddiM8 2020-06-06 14:55:30 +02:00
parent 60384ca8a8
commit 5b9e9849e8
1 changed files with 27 additions and 19 deletions
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46
kalk_cli/src/output.rs
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@ -4,28 +4,36 @@ use kalk::parser::{self};
pub fn eval(parser: &mut parser::Context, input: &str) {
match parser::parse(parser, input, 53) {
Ok(Some(result)) => {
let (_, digits, exp_option) = result.to_sign_string_exp(10, None);
let exp = if let Some(exp) = exp_option { exp } else { 0 };
if result.is_infinite() {
err("Too big to process.");
} else if result > 100_000_000 || result < -100_000_00 {
let sign = if result >= 0 { "" } else { "-" };
let (_, digits, exp) = result.to_sign_string_exp(10, None);
let value = format!(
"{}.{}",
digits[0..1].to_string(),
digits[1..].to_string().trim_end_matches('0')
);
println!("{}{}*10^{}", sign, value, exp.unwrap() - 1);
} else if result.clone().fract() == 0 {
println!("{}", result.to_integer().unwrap());
/*} else if result.clone().fract() == 0 {
println!("{}", result.to_integer().unwrap());*/
} else {
println!(
"{}",
result
.to_string()
.trim_end_matches('0')
.trim_end_matches('.')
);
let use_sci_notation = exp > 8 || exp < -6;
let comma_pos = if use_sci_notation { 1 } else { exp as usize };
let sign = if result >= 0 { "" } else { "-" };
let num = if use_sci_notation {
// Insert the comma if there are supposed to be decimals.
let mut chars: Vec<char> = digits.trim_end_matches('0').chars().collect();
chars.insert(comma_pos, '.');
chars.into_iter().collect::<String>()
} else if exp < 0 {
// 0 < x < 1
format!("0.{}{}", "0".repeat(exp.abs() as usize), digits)
} else {
// Regular number
digits[..(exp as usize)].to_string()
};
if use_sci_notation {
println!("{}{}*10^{}", sign, num, exp);
} else {
println!("{}{}", sign, num);
}
}
}
Ok(None) => print!(""),