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Optimize space for DocumentId with NonZeroUsize (#1097)

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Now Option<DocumentId> uses one byte rather than two
This commit is contained in:
Ivan Tham 2021-11-25 10:07:23 +08:00 committed by GitHub
parent e8f800a141
commit 67bf4250ca
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 27 additions and 16 deletions
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29
helix-view/src/editor.rs
View File

@ -11,6 +11,7 @@
use std::{
collections::BTreeMap,
io::stdin,
num::NonZeroUsize,
path::{Path, PathBuf},
pin::Pin,
sync::Arc,
@ -154,7 +155,7 @@ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
#[derive(Debug)]
pub struct Editor {
pub tree: Tree,
pub next_document_id: usize,
pub next_document_id: DocumentId,
pub documents: BTreeMap<DocumentId, Document>,
pub count: Option<std::num::NonZeroUsize>,
pub selected_register: Option<char>,
@ -198,7 +199,8 @@ pub fn new(
Self {
tree: Tree::new(area),
next_document_id: 0,
// Safety: 1 is non-zero
next_document_id: DocumentId::default(),
documents: BTreeMap::new(),
count: None,
selected_register: None,
@ -367,16 +369,19 @@ pub fn switch(&mut self, id: DocumentId, action: Action) {
self._refresh();
}
fn new_document(&mut self, mut document: Document) -> DocumentId {
let id = DocumentId(self.next_document_id);
self.next_document_id += 1;
document.id = id;
self.documents.insert(id, document);
/// Generate an id for a new document and register it.
fn new_document(&mut self, mut doc: Document) -> DocumentId {
let id = self.next_document_id;
// Safety: adding 1 from 1 is fine, probably impossible to reach usize max
self.next_document_id =
DocumentId(unsafe { NonZeroUsize::new_unchecked(self.next_document_id.0.get() + 1) });
doc.id = id;
self.documents.insert(id, doc);
id
}
fn new_file_from_document(&mut self, action: Action, document: Document) -> DocumentId {
let id = self.new_document(document);
fn new_file_from_document(&mut self, action: Action, doc: Document) -> DocumentId {
let id = self.new_document(doc);
self.switch(id, action);
id
}
@ -435,11 +440,7 @@ pub fn open(&mut self, path: PathBuf, action: Action) -> Result<DocumentId, Erro
doc.set_language_server(Some(language_server));
}
let id = DocumentId(self.next_document_id);
self.next_document_id += 1;
doc.id = id;
self.documents.insert(id, doc);
id
self.new_document(doc)
};
self.switch(id, action);

14
helix-view/src/lib.rs
View File

@ -12,8 +12,18 @@
pub mod tree;
pub mod view;
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Default, Debug)]
pub struct DocumentId(usize);
use std::num::NonZeroUsize;
// uses NonZeroUsize so Option<DocumentId> use a byte rather than two
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
pub struct DocumentId(NonZeroUsize);
impl Default for DocumentId {
fn default() -> DocumentId {
// Safety: 1 is non-zero
DocumentId(unsafe { NonZeroUsize::new_unchecked(1) })
}
}
slotmap::new_key_type! {
pub struct ViewId;