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//! Utilities for LSP-related boilerplate code.
use std::{error::Error, ops::Range};
use crossbeam_channel::Sender;
use lsp_server::{Message, Notification};
use ra_db::Canceled;
use ra_ide::LineIndex;
use serde::Serialize;
use crate::from_proto;
pub fn show_message(
typ: lsp_types::MessageType,
message: impl Into<String>,
sender: &Sender<Message>,
) {
let message = message.into();
let params = lsp_types::ShowMessageParams { typ, message };
let not = notification_new::<lsp_types::notification::ShowMessage>(params);
sender.send(not.into()).unwrap();
}
pub(crate) fn is_canceled(e: &(dyn Error + 'static)) -> bool {
e.downcast_ref::<Canceled>().is_some()
}
pub(crate) fn notification_is<N: lsp_types::notification::Notification>(
notification: &Notification,
) -> bool {
notification.method == N::METHOD
}
pub(crate) fn notification_new<N>(params: N::Params) -> Notification
where
N: lsp_types::notification::Notification,
N::Params: Serialize,
{
Notification::new(N::METHOD.to_string(), params)
}
pub(crate) fn apply_document_changes(
old_text: &mut String,
content_changes: Vec<lsp_types::TextDocumentContentChangeEvent>,
) {
let mut line_index = LineIndex::new(old_text);
// The changes we got must be applied sequentially, but can cross lines so we
// have to keep our line index updated.
// Some clients (e.g. Code) sort the ranges in reverse. As an optimization, we
// remember the last valid line in the index and only rebuild it if needed.
// The VFS will normalize the end of lines to `\n`.
enum IndexValid {
All,
UpToLineExclusive(u64),
}
impl IndexValid {
fn covers(&self, line: u64) -> bool {
match *self {
IndexValid::UpToLineExclusive(to) => to > line,
_ => true,
}
}
}
let mut index_valid = IndexValid::All;
for change in content_changes {
match change.range {
Some(range) => {
if !index_valid.covers(range.end.line) {
line_index = LineIndex::new(&old_text);
}
index_valid = IndexValid::UpToLineExclusive(range.start.line);
let range = from_proto::text_range(&line_index, range);
old_text.replace_range(Range::<usize>::from(range), &change.text);
}
None => {
*old_text = change.text;
index_valid = IndexValid::UpToLineExclusive(0);
}
}
}
}
#[cfg(test)]
mod tests {
use lsp_types::{Position, Range, TextDocumentContentChangeEvent};
use super::*;
#[test]
fn test_apply_document_changes() {
macro_rules! c {
[$($sl:expr, $sc:expr; $el:expr, $ec:expr => $text:expr),+] => {
vec![$(TextDocumentContentChangeEvent {
range: Some(Range {
start: Position { line: $sl, character: $sc },
end: Position { line: $el, character: $ec },
}),
range_length: None,
text: String::from($text),
}),+]
};
}
let mut text = String::new();
apply_document_changes(&mut text, vec![]);
assert_eq!(text, "");
apply_document_changes(
&mut text,
vec![TextDocumentContentChangeEvent {
range: None,
range_length: None,
text: String::from("the"),
}],
);
assert_eq!(text, "the");
apply_document_changes(&mut text, c![0, 3; 0, 3 => " quick"]);
assert_eq!(text, "the quick");
apply_document_changes(&mut text, c![0, 0; 0, 4 => "", 0, 5; 0, 5 => " foxes"]);
assert_eq!(text, "quick foxes");
apply_document_changes(&mut text, c![0, 11; 0, 11 => "\ndream"]);
assert_eq!(text, "quick foxes\ndream");
apply_document_changes(&mut text, c![1, 0; 1, 0 => "have "]);
assert_eq!(text, "quick foxes\nhave dream");
apply_document_changes(
&mut text,
c![0, 0; 0, 0 => "the ", 1, 4; 1, 4 => " quiet", 1, 16; 1, 16 => "s\n"],
);
assert_eq!(text, "the quick foxes\nhave quiet dreams\n");
apply_document_changes(&mut text, c![0, 15; 0, 15 => "\n", 2, 17; 2, 17 => "\n"]);
assert_eq!(text, "the quick foxes\n\nhave quiet dreams\n\n");
apply_document_changes(
&mut text,
c![1, 0; 1, 0 => "DREAM", 2, 0; 2, 0 => "they ", 3, 0; 3, 0 => "DON'T THEY?"],
);
assert_eq!(text, "the quick foxes\nDREAM\nthey have quiet dreams\nDON'T THEY?\n");
apply_document_changes(&mut text, c![0, 10; 1, 5 => "", 2, 0; 2, 12 => ""]);
assert_eq!(text, "the quick \nthey have quiet dreams\n");
text = String::from("❤️");
apply_document_changes(&mut text, c![0, 0; 0, 0 => "a"]);
assert_eq!(text, "a❤️");
text = String::from("a\nb");
apply_document_changes(&mut text, c![0, 1; 1, 0 => "\nțc", 0, 1; 1, 1 => "d"]);
assert_eq!(text, "adcb");
text = String::from("a\nb");
apply_document_changes(&mut text, c![0, 1; 1, 0 => "ț\nc", 0, 2; 0, 2 => "c"]);
assert_eq!(text, "ațc\ncb");
}
}
|
