asciimath 0.8.8

Mathematical expression parser and evaluator
Documentation 
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use crate::error::Error;
use std::{iter::Peekable, str};

pub type Result<T> = std::result::Result<T, Error>;

pub fn consume_while<F>(it: &mut Peekable<str::Chars>, x: F) -> String
where
    F: Fn(char) -> bool,
{
    let mut s = String::with_capacity(5);
    while let Some(&ch) = it.peek() {
        if x(ch) {
            it.next().unwrap();
            s.push(ch);
            continue;
        }
        break;
    }
    s
}