aboutsummaryrefslogtreecommitdiff
path: root/helix-lsp/src/lib.rs
blob: 6adaa3f87b5fece0c874d03965f493638aa35378 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
mod client;
mod select_all;
mod transport;

pub use jsonrpc_core as jsonrpc;
pub use lsp_types as lsp;

pub use client::Client;
pub use lsp::{Position, Url};

pub type Result<T> = core::result::Result<T, Error>;

use helix_core::syntax::LanguageConfiguration;

use thiserror::Error;

use std::{collections::HashMap, sync::Arc};

use serde::{Deserialize, Serialize};

use tokio_stream::wrappers::UnboundedReceiverStream;

#[derive(Error, Debug)]
pub enum Error {
    #[error("protocol error: {0}")]
    Rpc(#[from] jsonrpc::Error),
    #[error("failed to parse: {0}")]
    Parse(#[from] serde_json::Error),
    #[error("request timed out")]
    Timeout,
    #[error(transparent)]
    Other(#[from] anyhow::Error),
}

#[derive(Clone, Copy, Debug, Serialize, Deserialize)]
pub enum OffsetEncoding {
    /// UTF-8 code units aka bytes
    #[serde(rename = "utf-8")]
    Utf8,
    /// UTF-16 code units
    #[serde(rename = "utf-16")]
    Utf16,
}

pub mod util {
    use super::*;
    use helix_core::{Range, Rope, Transaction};

    pub fn lsp_pos_to_pos(
        doc: &Rope,
        pos: lsp::Position,
        offset_encoding: OffsetEncoding,
    ) -> usize {
        match offset_encoding {
            OffsetEncoding::Utf8 => {
                let line = doc.line_to_char(pos.line as usize);
                line + pos.character as usize
            }
            OffsetEncoding::Utf16 => {
                let line = doc.line_to_char(pos.line as usize);
                let line_start = doc.char_to_utf16_cu(line);
                doc.utf16_cu_to_char(line_start + pos.character as usize)
            }
        }
    }
    pub fn pos_to_lsp_pos(
        doc: &Rope,
        pos: usize,
        offset_encoding: OffsetEncoding,
    ) -> lsp::Position {
        match offset_encoding {
            OffsetEncoding::Utf8 => {
                let line = doc.char_to_line(pos);
                let line_start = doc.line_to_char(line);
                let col = pos - line_start;

                lsp::Position::new(line as u32, col as u32)
            }
            OffsetEncoding::Utf16 => {
                let line = doc.char_to_line(pos);
                let line_start = doc.char_to_utf16_cu(doc.line_to_char(line));
                let col = doc.char_to_utf16_cu(pos) - line_start;

                lsp::Position::new(line as u32, col as u32)
            }
        }
    }

    pub fn range_to_lsp_range(
        doc: &Rope,
        range: Range,
        offset_encoding: OffsetEncoding,
    ) -> lsp::Range {
        let start = pos_to_lsp_pos(doc, range.from(), offset_encoding);
        let end = pos_to_lsp_pos(doc, range.to(), offset_encoding);

        lsp::Range::new(start, end)
    }

    pub fn generate_transaction_from_edits(
        doc: &Rope,
        edits: Vec<lsp::TextEdit>,
        offset_encoding: OffsetEncoding,
    ) -> Transaction {
        Transaction::change(
            doc,
            edits.into_iter().map(|edit| {
                // simplify "" into None for cleaner changesets
                let replacement = if !edit.new_text.is_empty() {
                    Some(edit.new_text.into())
                } else {
                    None
                };

                let start = lsp_pos_to_pos(doc, edit.range.start, offset_encoding);
                let end = lsp_pos_to_pos(doc, edit.range.end, offset_encoding);
                (start, end, replacement)
            }),
        )
    }

    // apply_insert_replace_edit
}

#[derive(Debug, PartialEq, Clone)]
pub enum Notification {
    PublishDiagnostics(lsp::PublishDiagnosticsParams),
    ShowMessage(lsp::ShowMessageParams),
    LogMessage(lsp::LogMessageParams),
}

impl Notification {
    pub fn parse(method: &str, params: jsonrpc::Params) -> Notification {
        use lsp::notification::Notification as _;

        match method {
            lsp::notification::PublishDiagnostics::METHOD => {
                let params: lsp::PublishDiagnosticsParams = params
                    .parse()
                    .expect("Failed to parse PublishDiagnostics params");

                // TODO: need to loop over diagnostics and distinguish them by URI
                Notification::PublishDiagnostics(params)
            }

            lsp::notification::ShowMessage::METHOD => {
                let params: lsp::ShowMessageParams =
                    params.parse().expect("Failed to parse ShowMessage params");

                Notification::ShowMessage(params)
            }
            lsp::notification::LogMessage::METHOD => {
                let params: lsp::LogMessageParams =
                    params.parse().expect("Failed to parse ShowMessage params");

                Notification::LogMessage(params)
            }
            _ => unimplemented!("unhandled notification: {}", method),
        }
    }
}

pub use jsonrpc::Call;

type LanguageId = String;

use crate::select_all::SelectAll;

pub struct Registry {
    inner: HashMap<LanguageId, Option<Arc<Client>>>,

    pub incoming: SelectAll<UnboundedReceiverStream<Call>>,
}

impl Default for Registry {
    fn default() -> Self {
        Self::new()
    }
}

impl Registry {
    pub fn new() -> Self {
        Self {
            inner: HashMap::new(),
            incoming: SelectAll::new(),
        }
    }

    pub fn get(&mut self, language_config: &LanguageConfiguration) -> Option<Arc<Client>> {
        // TODO: propagate the error
        if let Some(config) = &language_config.language_server {
            // avoid borrow issues
            let inner = &mut self.inner;
            let s_incoming = &self.incoming;

            let language_server = inner
                .entry(language_config.scope.clone()) // can't use entry with Borrow keys: https://github.com/rust-lang/rfcs/pull/1769
                .or_insert_with(|| {
                    // TODO: lookup defaults for id (name, args)

                    // initialize a new client
                    let (mut client, incoming) =
                        Client::start(&config.command, &config.args).ok()?;

                    // TODO: run this async without blocking
                    futures_executor::block_on(client.initialize()).unwrap();

                    s_incoming.push(UnboundedReceiverStream::new(incoming));

                    Some(Arc::new(client))
                })
                .clone();

            return language_server;
        }

        None
    }
}

// REGISTRY = HashMap<LanguageId, Lazy/OnceCell<Arc<RwLock<Client>>>
// spawn one server per language type, need to spawn one per workspace if server doesn't support
// workspaces
//
// could also be a client per root dir
//
// storing a copy of Option<Arc<RwLock<Client>>> on Document would make the LSP client easily
// accessible during edit/save callbacks
//
// the event loop needs to process all incoming streams, maybe we can just have that be a separate
// task that's continually running and store the state on the client, then use read lock to
// retrieve data during render
// -> PROBLEM: how do you trigger an update on the editor side when data updates?
//
// -> The data updates should pull all events until we run out so we don't frequently re-render
//
//
// v2:
//
// there should be a registry of lsp clients, one per language type (or workspace).
// the clients should lazy init on first access
// the client.initialize() should be called async and we buffer any requests until that completes
// there needs to be a way to process incoming lsp messages from all clients.
//  -> notifications need to be dispatched to wherever
//  -> requests need to generate a reply and travel back to the same lsp!