use crate::{Action, KeyBindingContextPredicate, Keystroke};use anyhow::Result;use smallvec::SmallVec; /// A keybinding and its associated metadata, from the keymap.pub struct KeyBinding {    pub(crate) action: Box<dyn Action>,    pub(crate) keystrokes: SmallVec<[Keystroke; 2]>,    pub(crate) context_predicate: Option<KeyBindingContextPredicate>,} impl Clone for KeyBinding {    fn clone(&self) -> Self {        KeyBinding {            action: self.action.boxed_clone(),            keystrokes: self.keystrokes.clone(),            context_predicate: self.context_predicate.clone(),        }    }} impl KeyBinding {    /// Construct a new keybinding from the given data.    pub fn new<A: Action>(keystrokes: &str, action: A, context_predicate: Option<&str>) -> Self {        Self::load(keystrokes, Box::new(action), context_predicate).unwrap()    }     /// Load a keybinding from the given raw data.    pub fn load(keystrokes: &str, action: Box<dyn Action>, context: Option<&str>) -> Result<Self> {        let context = if let Some(context) = context {            Some(KeyBindingContextPredicate::parse(context)?)        } else {            None        };         let keystrokes = keystrokes            .split_whitespace()            .map(Keystroke::parse)            .collect::<Result<_>>()?;         Ok(Self {            keystrokes,            action,            context_predicate: context,        })    }     /// Check if the given keystrokes match this binding.    pub fn match_keystrokes(&self, typed: &[Keystroke]) -> Option<bool> {        if self.keystrokes.len() < typed.len() {            return None;        }         for (target, typed) in self.keystrokes.iter().zip(typed.iter()) {            if !typed.should_match(target) {                return None;            }        }         return Some(self.keystrokes.len() > typed.len());    }     /// Get the keystrokes associated with this binding    pub fn keystrokes(&self) -> &[Keystroke] {        self.keystrokes.as_slice()    }     /// Get the action associated with this binding    pub fn action(&self) -> &dyn Action {        self.action.as_ref()    }} impl std::fmt::Debug for KeyBinding {    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {        f.debug_struct("KeyBinding")            .field("keystrokes", &self.keystrokes)            .field("context_predicate", &self.context_predicate)            .field("action", &self.action.name())            .finish()    }}