rqism 0.4.1

A multi-backend quantum circuit simulator
Documentation 
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use itertools::Itertools;
use std::{collections::HashMap, fmt::Display};

#[allow(non_upper_case_globals)]
const color_green: &str = "\x1B[92m";

#[allow(non_upper_case_globals)]
const color_yellow: &str = "\x1B[93m";

#[allow(non_upper_case_globals)]
const color_grey: &str = "\x1B[37m";

#[allow(non_upper_case_globals)]
pub const color_reset: &str = "\x1B[39m";

/// Similar to the return type of get_conunts in qiskit.
#[derive(Clone)]
pub struct Counts {
    pub data: HashMap<String, i32>,
    pub shots: usize,
}

impl Display for Counts {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let mut pairs = self
            .data
            .iter()
            .map(|(x, y)| (x.clone(), *y))
            .collect::<Vec<(String, i32)>>();

        pairs.sort_by(|a, b| {
            let ai = i32::from_str_radix(&a.0, 10).unwrap();
            let bi = i32::from_str_radix(&b.0, 10).unwrap();

            ai.cmp(&bi)
        });

        let joined = pairs
            .iter()
            .map(|(st, va)| {
                let p = (*va) as f32 / self.shots as f32;

                if p > 0.25 {
                    format!("{color_green}{}|{}⟩{color_reset}", p, st)
                } else if p > 0.1 {
                    format!("{color_yellow}{}|{}⟩{color_reset}", p, st)
                } else {
                    format!("{color_grey}{}|{}⟩{color_reset}", p, st)
                }
            })
            .join(" + ");

        write!(f, "|ψ⟩ = {}", joined)
    }
}

impl Counts {
    /// Print the state as a linear combination of states, states with a coef
    /// of zero are ignored. It now calls println!();, and is kept for backwards
    /// compatbility.
    pub fn print_psi(&self) {
        println!("{}", self);
    }
}