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use std::io;
use std::io::Write;
const DEFAULT_ERR: &str = "That value does not pass please try again";
pub struct InputBuilder<'a, T, F>
where
F: Fn(&T) -> bool,
{
msg: Option<&'a str>,
err: Option<&'a str>,
default: Option<T>,
test: Option<Vec<(F, Option<&'a str>)>>,
}
impl<'a, T, F> InputBuilder<'a, T, F>
where
T: std::str::FromStr,
F: Fn(&T) -> bool,
{
pub fn msg(self, msg: &'a str) -> Self {
InputBuilder {
msg: Some(msg),
..self
}
}
pub fn err(self, err: &'a str) -> Self {
InputBuilder {
err: Some(err),
..self
}
}
pub fn default(self, default: T) -> Self {
InputBuilder {
default: Some(default),
..self
}
}
pub fn test(self, test: F, err: Option<&'a str>) -> Self {
InputBuilder {
test: Some(match self.test {
Some(v) => {
let mut x = v;
x.push((test, err));
x
}
None => vec![(test, err)],
}),
..self
}
}
pub fn get(self) -> T {
read_input::<T, F>(self.msg, self.err, self.default, &self.test)
}
}
pub fn input_new<'a, T>() -> InputBuilder<'a, T, &'a (dyn Fn(&T) -> bool)> {
InputBuilder {
msg: None,
err: None,
default: None,
test: None::<Vec<(&'a (dyn Fn(&T) -> bool), Option<&'a str>)>>,
}
}
pub fn valid_input<'a, T>(test: &'a (dyn Fn(&T) -> bool)) -> T
where
T: std::str::FromStr,
{
input_new().test(&test, None).get()
}
pub fn simple_input<T>() -> T
where
T: std::str::FromStr,
{
input_new().get()
}
fn read_input<T, F>(
msg: Option<&str>,
err: Option<&str>,
default: Option<T>,
test: &Option<Vec<(F, Option<&str>)>>,
) -> T
where
T: std::str::FromStr,
F: Fn(&T) -> bool,
{
if let Some(msg) = msg {
print!("{}", msg);
io::stdout().flush().expect("could not flush output");
};
let mut input = String::new();
io::stdin()
.read_line(&mut input)
.expect("Failed to read line");
if input.trim().is_empty() {
if let Some(x) = default {
return x;
}
};
loop {
if let Ok(num) = T::from_str(&input.trim()) {
let mut test_err = None;
if test.as_ref().map_or(true, |v| {
v.iter().all(|f| {
if f.0(&num) {
true
} else {
test_err = Some(f.1.unwrap_or(err.unwrap_or(DEFAULT_ERR)));
false
}
})
}) {
return num;
} else {
println!("{}", test_err.unwrap_or(err.unwrap_or(DEFAULT_ERR)));
}
} else {
println!("{}", err.unwrap_or(DEFAULT_ERR));
}
input = String::new();
io::stdin()
.read_line(&mut input)
.expect("Failed to read line");
}
}