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pub fn combinations_of<T: Clone>(items: &[Vec<T>]) -> Vec<Vec<T>> {
let mut combinations = Vec::new();
if items.is_empty() {
return combinations;
};
if items.len() == 1 {
for item in &items[0] {
combinations.push(vec![item.clone()]);
}
return combinations;
};
for i in 0..items[0].len() {
let item = &items[0][i];
for other_combinations in combinations_of(&items[1..]) {
let mut combination = vec![item.clone()];
combination.extend(other_combinations);
combinations.push(combination);
}
}
combinations
}
pub fn to_pascal_case(s: &str) -> String {
// we get the first item later so this is to make it impossible for that
// to error
if s.is_empty() {
return String::new();
}
let mut result = String::new();
let mut prev_was_underscore = true; // set to true by default so the first character is capitalized
if s.chars().next().unwrap().is_numeric() {
result.push('_');
}
for c in s.chars() {
if c == '_' {
prev_was_underscore = true;
} else if prev_was_underscore {
result.push(c.to_ascii_uppercase());
prev_was_underscore = false;
} else {
result.push(c);
}
}
result
}
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