336 lines
12 KiB
Rust
336 lines
12 KiB
Rust
mod binding;
|
|
mod context;
|
|
|
|
pub use binding::*;
|
|
pub use context::*;
|
|
|
|
use crate::{Action, Keystroke, is_no_action};
|
|
use collections::HashMap;
|
|
use smallvec::SmallVec;
|
|
use std::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]>>,
|
|
no_action_binding_indices: Vec<usize>,
|
|
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) {
|
|
for binding in bindings {
|
|
let action_id = binding.action().as_any().type_id();
|
|
if is_no_action(&*binding.action) {
|
|
self.no_action_binding_indices.push(self.bindings.len());
|
|
} 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.no_action_binding_indices.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. For display,
|
|
/// the last binding should take precedence.
|
|
pub fn bindings_for_action<'a>(
|
|
&'a self,
|
|
action: &'a dyn Action,
|
|
) -> impl 'a + DoubleEndedIterator<Item = &'a KeyBinding> {
|
|
let action_id = action.type_id();
|
|
let binding_indices = self
|
|
.binding_indices_by_action_id
|
|
.get(&action_id)
|
|
.map_or(&[] as _, SmallVec::as_slice)
|
|
.iter();
|
|
|
|
binding_indices.filter_map(|ix| {
|
|
let binding = &self.bindings[*ix];
|
|
if !binding.action().partial_eq(action) {
|
|
return None;
|
|
}
|
|
|
|
for null_ix in &self.no_action_binding_indices {
|
|
if null_ix > ix {
|
|
let null_binding = &self.bindings[*null_ix];
|
|
if null_binding.keystrokes == binding.keystrokes {
|
|
let null_binding_matches =
|
|
match (&null_binding.context_predicate, &binding.context_predicate) {
|
|
(None, _) => true,
|
|
(Some(_), None) => false,
|
|
(Some(null_predicate), Some(predicate)) => {
|
|
null_predicate.is_superset(predicate)
|
|
}
|
|
};
|
|
if null_binding_matches {
|
|
return None;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
Some(binding)
|
|
})
|
|
}
|
|
|
|
/// Returns all bindings that might match the input without checking context. The bindings
|
|
/// returned in precedence order (reverse of the order they were added to the keymap).
|
|
pub fn all_bindings_for_input(&self, input: &[Keystroke]) -> Vec<KeyBinding> {
|
|
self.bindings()
|
|
.rev()
|
|
.filter_map(|binding| {
|
|
binding.match_keystrokes(input).filter(|pending| !pending)?;
|
|
Some(binding.clone())
|
|
})
|
|
.collect()
|
|
}
|
|
|
|
/// Returns a list of bindings that match the given input, and a boolean indicating whether or
|
|
/// not more bindings might match if the input was longer. Bindings are returned in precedence
|
|
/// order.
|
|
///
|
|
/// Precedence is defined by the depth in the tree (matches on the Editor take precedence over
|
|
/// matches on the Pane, then the Workspace, etc.). Bindings with no context are treated as the
|
|
/// same as the deepest context.
|
|
///
|
|
/// In the case of multiple bindings at the same depth, the ones added to the keymap later take
|
|
/// precedence. User bindings are added after built-in bindings so that they take precedence.
|
|
///
|
|
/// If a user has disabled a binding with `"x": null` it will not be returned. Disabled bindings
|
|
/// are evaluated with the same precedence rules so you can disable a rule in a given context
|
|
/// only.
|
|
pub fn bindings_for_input(
|
|
&self,
|
|
input: &[Keystroke],
|
|
context_stack: &[KeyContext],
|
|
) -> (SmallVec<[KeyBinding; 1]>, bool) {
|
|
let possibilities = self.bindings().rev().filter_map(|binding| {
|
|
binding
|
|
.match_keystrokes(input)
|
|
.map(|pending| (binding, pending))
|
|
});
|
|
|
|
let mut bindings: SmallVec<[(KeyBinding, usize); 1]> = SmallVec::new();
|
|
let mut is_pending = None;
|
|
|
|
'outer: for (binding, pending) in possibilities {
|
|
for depth in (0..=context_stack.len()).rev() {
|
|
if self.binding_enabled(binding, &context_stack[0..depth]) {
|
|
if is_pending.is_none() {
|
|
is_pending = Some(pending);
|
|
}
|
|
if !pending {
|
|
bindings.push((binding.clone(), depth));
|
|
continue 'outer;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
bindings.sort_by(|a, b| a.1.cmp(&b.1).reverse());
|
|
let bindings = bindings
|
|
.into_iter()
|
|
.map_while(|(binding, _)| {
|
|
if is_no_action(&*binding.action) {
|
|
None
|
|
} else {
|
|
Some(binding)
|
|
}
|
|
})
|
|
.collect();
|
|
|
|
(bindings, is_pending.unwrap_or_default())
|
|
}
|
|
|
|
/// Check if the given binding is enabled, given a certain key context.
|
|
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;
|
|
}
|
|
}
|
|
|
|
true
|
|
}
|
|
|
|
/// WARN: Assumes the bindings are in the order they were added to the keymap
|
|
/// returns the last binding for the given bindings, which
|
|
/// should be the user's binding in their keymap.json if they've set one,
|
|
/// otherwise, the last declared binding for this action in the base keymaps
|
|
/// (with Vim mode bindings being considered as declared later if Vim mode
|
|
/// is enabled)
|
|
///
|
|
/// If you are considering changing the behavior of this function
|
|
/// (especially to fix a user reported issue) see issues #23621, #24931,
|
|
/// and possibly others as evidence that it has swapped back and forth a
|
|
/// couple times. The decision as of now is to pick a side and leave it
|
|
/// as is, until we have a better way to decide which binding to display
|
|
/// that is consistent and not confusing.
|
|
pub fn binding_to_display_from_bindings(mut bindings: Vec<KeyBinding>) -> Option<KeyBinding> {
|
|
bindings.pop()
|
|
}
|
|
|
|
/// Like `bindings_to_display_from_bindings` but takes a `DoubleEndedIterator` and returns a
|
|
/// reference.
|
|
pub fn binding_to_display_from_bindings_iterator<'a>(
|
|
mut bindings: impl DoubleEndedIterator<Item = &'a KeyBinding>,
|
|
) -> Option<&'a KeyBinding> {
|
|
bindings.next_back()
|
|
}
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
use crate as gpui;
|
|
use gpui::{NoAction, 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
|
|
.bindings_for_input(
|
|
&[Keystroke::parse("ctrl-a").unwrap()],
|
|
&[KeyContext::parse("barf").unwrap()],
|
|
)
|
|
.0
|
|
.is_empty()
|
|
);
|
|
assert!(
|
|
!keymap
|
|
.bindings_for_input(
|
|
&[Keystroke::parse("ctrl-a").unwrap()],
|
|
&[KeyContext::parse("editor").unwrap()],
|
|
)
|
|
.0
|
|
.is_empty()
|
|
);
|
|
|
|
// binding is disabled in a more specific context
|
|
assert!(
|
|
keymap
|
|
.bindings_for_input(
|
|
&[Keystroke::parse("ctrl-a").unwrap()],
|
|
&[KeyContext::parse("editor mode=full").unwrap()],
|
|
)
|
|
.0
|
|
.is_empty()
|
|
);
|
|
|
|
// binding is globally disabled
|
|
assert!(
|
|
keymap
|
|
.bindings_for_input(
|
|
&[Keystroke::parse("ctrl-b").unwrap()],
|
|
&[KeyContext::parse("barf").unwrap()],
|
|
)
|
|
.0
|
|
.is_empty()
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_bindings_for_action() {
|
|
let bindings = [
|
|
KeyBinding::new("ctrl-a", ActionAlpha {}, Some("pane")),
|
|
KeyBinding::new("ctrl-b", ActionBeta {}, Some("editor && mode == full")),
|
|
KeyBinding::new("ctrl-c", ActionGamma {}, Some("workspace")),
|
|
KeyBinding::new("ctrl-a", NoAction {}, Some("pane && active")),
|
|
KeyBinding::new("ctrl-b", NoAction {}, Some("editor")),
|
|
];
|
|
|
|
let mut keymap = Keymap::default();
|
|
keymap.add_bindings(bindings.clone());
|
|
|
|
assert_bindings(&keymap, &ActionAlpha {}, &["ctrl-a"]);
|
|
assert_bindings(&keymap, &ActionBeta {}, &[]);
|
|
assert_bindings(&keymap, &ActionGamma {}, &["ctrl-c"]);
|
|
|
|
#[track_caller]
|
|
fn assert_bindings(keymap: &Keymap, action: &dyn Action, expected: &[&str]) {
|
|
let actual = keymap
|
|
.bindings_for_action(action)
|
|
.map(|binding| binding.keystrokes[0].unparse())
|
|
.collect::<Vec<_>>();
|
|
assert_eq!(actual, expected, "{:?}", action);
|
|
}
|
|
}
|
|
}
|