oak_haskell/
lsp.rs

1use crate::{HaskellLanguage, kind::HaskellSyntaxKind};
2use core::range::Range;
3use futures::Future;
4use oak_core::tree::RedNode;
5use oak_hover::{Hover, HoverProvider};
6use oak_lsp::service::LanguageService;
7use oak_vfs::Vfs;
8
9/// Hover provider implementation for Haskell.
10pub struct HaskellHoverProvider;
11
12impl HoverProvider<HaskellLanguage> for HaskellHoverProvider {
13    fn hover(&self, node: &RedNode<HaskellLanguage>, _range: Range<usize>) -> Option<Hover> {
14        let kind = node.green.kind;
15
16        // Provide context-aware hover information
17        let contents = match kind {
18            HaskellSyntaxKind::Function => "### Haskell Function\nDefines a transformation from inputs to outputs.",
19            HaskellSyntaxKind::DataDeclaration => "### Haskell Data Type\nDefines a new algebraic data type.",
20            HaskellSyntaxKind::ModuleDeclaration => "### Haskell Module\nOrganizes Haskell code into namespaces.",
21            _ => return None,
22        };
23
24        Some(Hover { contents: contents.to_string(), range: Some(node.span()) })
25    }
26}
27
28/// Language service implementation for Haskell.
29pub struct HaskellLanguageService<V: Vfs> {
30    vfs: V,
31    workspace: oak_lsp::workspace::WorkspaceManager,
32    hover_provider: HaskellHoverProvider,
33}
34
35impl<V: Vfs> HaskellLanguageService<V> {
36    /// Creates a new `HaskellLanguageService`.
37    pub fn new(vfs: V) -> Self {
38        Self { vfs, workspace: oak_lsp::workspace::WorkspaceManager::default(), hover_provider: HaskellHoverProvider }
39    }
40}
41
42impl<V: Vfs + Send + Sync + 'static + oak_vfs::WritableVfs> LanguageService for HaskellLanguageService<V> {
43    type Lang = HaskellLanguage;
44    type Vfs = V;
45
46    fn vfs(&self) -> &Self::Vfs {
47        &self.vfs
48    }
49
50    fn workspace(&self) -> &oak_lsp::workspace::WorkspaceManager {
51        &self.workspace
52    }
53
54    fn get_root(&self, uri: &str) -> impl Future<Output = Option<RedNode<'_, HaskellLanguage>>> + Send + '_ {
55        let source = self.vfs().get_source(uri);
56        async move {
57            let source = source?;
58            let language = HaskellLanguage::default();
59            let parser = crate::parser::HaskellParser::new(&language);
60            let lexer = crate::lexer::HaskellLexer::new(&language);
61
62            let mut cache = oak_core::parser::session::ParseSession::<HaskellLanguage>::default();
63            let _output = oak_core::parser::parse(&parser, &lexer, &source, &[], &mut cache);
64            None
65        }
66    }
67
68    fn hover(&self, uri: &str, range: Range<usize>) -> impl Future<Output = Option<oak_lsp::Hover>> + Send + '_ {
69        let uri = uri.to_string();
70        async move { self.with_root(&uri, |root| self.hover_provider.hover(&root, range).map(|h| oak_lsp::Hover { contents: h.contents, range: h.range })).await.flatten() }
71    }
72}
oak_haskell/lsp.rs

oak_haskell/
lsp.rs
