promkit-widgets 0.5.0

use std::collections::VecDeque;

use promkit_core::grapheme::StyledGraphemes;

/// Defines a `Len` trait for obtaining the length of a collection
/// and checking if it is empty.
pub trait Len {
    /// Returns the length of the collection.
    fn len(&self) -> usize;

    /// Returns `true` if the collection is empty, otherwise `false`.
    fn is_empty(&self) -> bool;
}

/// Implements the `Len` trait for `Vec<T>`.
impl<T> Len for Vec<T> {
    /// Returns the number of elements in the vector.
    fn len(&self) -> usize {
        self.len()
    }

    /// Checks if the vector is empty.
    fn is_empty(&self) -> bool {
        self.is_empty()
    }
}

/// Implements the `Len` trait for `VecDeque<T>`.
impl<T> Len for VecDeque<T> {
    /// Returns the number of elements in the queue.
    fn len(&self) -> usize {
        self.len()
    }

    /// Checks if the queue is empty.
    fn is_empty(&self) -> bool {
        self.is_empty()
    }
}

/// Implements the `Len` trait for `String`.
impl Len for String {
    /// Returns the length of the string.
    fn len(&self) -> usize {
        self.len()
    }

    /// Checks if the string is empty.
    fn is_empty(&self) -> bool {
        self.is_empty()
    }
}

impl Len for StyledGraphemes {
    /// Returns the number of `Grapheme` instances in the collection.
    fn len(&self) -> usize {
        self.0.len()
    }

    /// Checks if the collection is empty.
    fn is_empty(&self) -> bool {
        self.0.is_empty()
    }
}