mod binding;mod context;mod matcher; pub use binding::*;pub use context::*;pub(crate) use matcher::*; use crate::{Action, Keystroke, NoAction};use collections::{HashMap, HashSet};use smallvec::SmallVec;use std::any::{Any, TypeId}; /// An opaque identifier of which version of the keymap is currently active./// The keymap's version is changed whenever bindings are added or removed.#[derive(Copy, Clone, Eq, PartialEq, Default)]pub struct KeymapVersion(usize); /// A collection of key bindings for the user's application.#[derive(Default)]pub struct Keymap {    bindings: Vec<KeyBinding>,    binding_indices_by_action_id: HashMap<TypeId, SmallVec<[usize; 3]>>,    disabled_keystrokes:        HashMap<SmallVec<[Keystroke; 2]>, HashSet<Option<KeyBindingContextPredicate>>>,    version: KeymapVersion,} impl Keymap {    /// Create a new keymap with the given bindings.    pub fn new(bindings: Vec<KeyBinding>) -> Self {        let mut this = Self::default();        this.add_bindings(bindings);        this    }     /// Get the current version of the keymap.    pub fn version(&self) -> KeymapVersion {        self.version    }     /// Add more bindings to the keymap.    pub fn add_bindings<T: IntoIterator<Item = KeyBinding>>(&mut self, bindings: T) {        let no_action_id = (NoAction {}).type_id();         for binding in bindings {            let action_id = binding.action().as_any().type_id();            if action_id == no_action_id {                self.disabled_keystrokes                    .entry(binding.keystrokes)                    .or_default()                    .insert(binding.context_predicate);            } else {                self.binding_indices_by_action_id                    .entry(action_id)                    .or_default()                    .push(self.bindings.len());                self.bindings.push(binding);            }        }         self.version.0 += 1;    }     /// Reset this keymap to its initial state.    pub fn clear(&mut self) {        self.bindings.clear();        self.binding_indices_by_action_id.clear();        self.disabled_keystrokes.clear();        self.version.0 += 1;    }     /// Iterate over all bindings, in the order they were added.    pub fn bindings(&self) -> impl DoubleEndedIterator<Item = &KeyBinding> {        self.bindings.iter()    }     /// Iterate over all bindings for the given action, in the order they were added.    pub fn bindings_for_action<'a>(        &'a self,        action: &'a dyn Action,    ) -> impl 'a + DoubleEndedIterator<Item = &'a KeyBinding> {        let action_id = action.type_id();        self.binding_indices_by_action_id            .get(&action_id)            .map_or(&[] as _, SmallVec::as_slice)            .iter()            .map(|ix| &self.bindings[*ix])            .filter(move |binding| binding.action().partial_eq(action))    }     /// Check if the given binding is enabled, given a certain key context.    pub fn binding_enabled(&self, binding: &KeyBinding, context: &[KeyContext]) -> bool {        // If binding has a context predicate, it must match the current context,        if let Some(predicate) = &binding.context_predicate {            if !predicate.eval(context) {                return false;            }        }         if let Some(disabled_predicates) = self.disabled_keystrokes.get(&binding.keystrokes) {            for disabled_predicate in disabled_predicates {                match disabled_predicate {                    // The binding must not be globally disabled.                    None => return false,                     // The binding must not be disabled in the current context.                    Some(predicate) => {                        if predicate.eval(context) {                            return false;                        }                    }                }            }        }         true    }} #[cfg(test)]mod tests {    use super::*;    use crate as gpui;    use gpui::actions;     actions!(        keymap_test,        [ActionAlpha, ActionBeta, ActionGamma, ActionDelta,]    );     #[test]    fn test_keymap() {        let bindings = [            KeyBinding::new("ctrl-a", ActionAlpha {}, None),            KeyBinding::new("ctrl-a", ActionBeta {}, Some("pane")),            KeyBinding::new("ctrl-a", ActionGamma {}, Some("editor && mode==full")),        ];         let mut keymap = Keymap::default();        keymap.add_bindings(bindings.clone());         // global bindings are enabled in all contexts        assert!(keymap.binding_enabled(&bindings[0], &[]));        assert!(keymap.binding_enabled(&bindings[0], &[KeyContext::parse("terminal").unwrap()]));         // contextual bindings are enabled in contexts that match their predicate        assert!(!keymap.binding_enabled(&bindings[1], &[KeyContext::parse("barf x=y").unwrap()]));        assert!(keymap.binding_enabled(&bindings[1], &[KeyContext::parse("pane x=y").unwrap()]));         assert!(!keymap.binding_enabled(&bindings[2], &[KeyContext::parse("editor").unwrap()]));        assert!(keymap.binding_enabled(            &bindings[2],            &[KeyContext::parse("editor mode=full").unwrap()]        ));    }     #[test]    fn test_keymap_disabled() {        let bindings = [            KeyBinding::new("ctrl-a", ActionAlpha {}, Some("editor")),            KeyBinding::new("ctrl-b", ActionAlpha {}, Some("editor")),            KeyBinding::new("ctrl-a", NoAction {}, Some("editor && mode==full")),            KeyBinding::new("ctrl-b", NoAction {}, None),        ];         let mut keymap = Keymap::default();        keymap.add_bindings(bindings.clone());         // binding is only enabled in a specific context        assert!(!keymap.binding_enabled(&bindings[0], &[KeyContext::parse("barf").unwrap()]));        assert!(keymap.binding_enabled(&bindings[0], &[KeyContext::parse("editor").unwrap()]));         // binding is disabled in a more specific context        assert!(!keymap.binding_enabled(            &bindings[0],            &[KeyContext::parse("editor mode=full").unwrap()]        ));         // binding is globally disabled        assert!(!keymap.binding_enabled(&bindings[1], &[KeyContext::parse("barf").unwrap()]));    }}