Implement support for Jupyter Notebooks in ruff server

Author: snowsignal

Cargo.lock

@@ -23,7 +23,7 @@ impl fmt::Display for SourceValue {
 
 impl Cell {
     /// Return the [`SourceValue`] of the cell.
-    pub(crate) fn source(&self) -> &SourceValue {
+    pub fn source(&self) -> &SourceValue {
         match self {
             Cell::Code(cell) => &cell.source,
             Cell::Markdown(cell) => &cell.source,

crates/ruff_notebook/src/cell.rs

@@ -85,6 +85,23 @@ impl Notebook {
         Self::from_reader(Cursor::new(source_code))
     }
 
+    /// Generate a pseudo-representation of a notebook that can be used
+    /// for linting by the language server. As this is not generated directly from the raw JSON
+    /// of a notebook file, writing this back into the file system is a bad idea.
+    pub fn from_cells(
+        cells: Vec<Cell>,
+        metadata: crate::RawNotebookMetadata,
+    ) -> Result<Self, NotebookError> {
+        let raw_notebook = RawNotebook {
+            cells,
+            metadata,
+            nbformat: 4,
+            nbformat_minor: 5,
+        };
+
+        Self::from_raw(raw_notebook, false)
+    }
+
     /// Read a Jupyter Notebook from a [`Read`] implementer.
     ///
     /// See also the black implementation
@@ -98,7 +115,7 @@ impl Notebook {
             reader.read_exact(&mut buf).is_ok_and(|()| buf[0] == b'\n')
         });
         reader.rewind()?;
-        let mut raw_notebook: RawNotebook = match serde_json::from_reader(reader.by_ref()) {
+        let raw_notebook: RawNotebook = match serde_json::from_reader(reader.by_ref()) {
             Ok(notebook) => notebook,
             Err(err) => {
                 // Translate the error into a diagnostic
@@ -113,7 +130,13 @@ impl Notebook {
                 });
             }
         };
+        Self::from_raw(raw_notebook, trailing_newline)
+    }
 
+    fn from_raw(
+        mut raw_notebook: RawNotebook,
+        trailing_newline: bool,
+    ) -> Result<Self, NotebookError> {
         // v4 is what everybody uses
         if raw_notebook.nbformat != 4 {
             // bail because we should have already failed at the json schema stage

crates/ruff_notebook/src/notebook.rs

@@ -21,6 +21,7 @@ ruff_python_codegen = { workspace = true }
 ruff_python_formatter = { workspace = true }
 ruff_python_index = { workspace = true }
 ruff_python_parser = { workspace = true }
+ruff_notebook = { path = "../ruff_notebook" }
 ruff_source_file = { workspace = true }
 ruff_text_size = { workspace = true }
 ruff_workspace = { workspace = true }

crates/ruff_server/Cargo.toml

@@ -1,18 +1,20 @@
 //! Types and utilities for working with text, modifying source files, and `Ruff <-> LSP` type conversion.
 
 mod document;
+mod notebook;
 mod range;
 mod replacement;
 
-use std::collections::HashMap;
+use std::{collections::HashMap, ffi::OsStr, path::PathBuf};
 
-pub use document::Document;
 pub(crate) use document::DocumentVersion;
+pub use document::TextDocument;
 use lsp_types::PositionEncodingKind;
+pub(crate) use notebook::NotebookDocument;
 pub(crate) use range::{RangeExt, ToRangeExt};
 pub(crate) use replacement::Replacement;
 
-use crate::session::ResolvedClientCapabilities;
+use crate::{fix::Fixes, session::ResolvedClientCapabilities};
 
 /// A convenient enumeration for supported text encodings. Can be converted to [`lsp_types::PositionEncodingKind`].
 // Please maintain the order from least to greatest priority for the derived `Ord` impl.
@@ -29,6 +31,57 @@ pub enum PositionEncoding {
     UTF8,
 }
 
+/// A unique document ID, derived from a URL passed as part of an LSP request.
+/// This document ID can point to either be a standalone Python file, a full notebook, or a cell within a notebook.
+#[derive(Clone, Debug)]
+pub(crate) enum DocumentKey {
+    Notebook(PathBuf),
+    NotebookCell(lsp_types::Url),
+    Text(PathBuf),
+}
+
+impl DocumentKey {
+    /// Creates a document key from a URL provided in an LSP request.
+    pub(crate) fn from_url(url: &lsp_types::Url) -> Self {
+        if url.scheme() != "file" {
+            return Self::NotebookCell(url.clone());
+        }
+        let Some(path) = url.to_file_path().ok() else {
+            return Self::NotebookCell(url.clone());
+        };
+
+        // figure out whether this is a notebook or a text document
+        if path.extension() == Some(OsStr::new("ipynb")) {
+            Self::Notebook(path)
+        } else {
+            // Until we support additional document types, we need to confirm
+            // that any non-notebook file is a Python file
+            debug_assert_eq!(path.extension(), Some(OsStr::new("py")));
+            Self::Text(path)
+        }
+    }
+
+    /// Converts the key back into its original URL.
+    pub(crate) fn into_url(self) -> lsp_types::Url {
+        match self {
+            DocumentKey::NotebookCell(url) => url,
+            DocumentKey::Notebook(path) | DocumentKey::Text(path) => {
+                lsp_types::Url::from_file_path(path)
+                    .expect("file path originally from URL should convert back to URL")
+            }
+        }
+    }
+}
+
+impl std::fmt::Display for DocumentKey {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::NotebookCell(url) => url.fmt(f),
+            Self::Notebook(path) | Self::Text(path) => path.display().fmt(f),
+        }
+    }
+}
+
 /// Tracks multi-document edits to eventually merge into a `WorkspaceEdit`.
 /// Compatible with clients that don't support `workspace.workspaceEdit.documentChanges`.
 #[derive(Debug)]
@@ -72,6 +125,18 @@ impl WorkspaceEditTracker {
         }
     }
 
+    /// Sets a series of [`Fixes`] for a text or notebook document.
+    pub(crate) fn set_fixes_for_document(
+        &mut self,
+        fixes: Fixes,
+        version: DocumentVersion,
+    ) -> crate::Result<()> {
+        for (uri, edits) in fixes {
+            self.set_edits_for_document(uri, version, edits)?;
+        }
+        Ok(())
+    }
+
     /// Sets the edits made to a specific document. This should only be called
     /// once for each document `uri`, and will fail if this is called for the same `uri`
     /// multiple times.

crates/ruff_server/src/edit.rs

@@ -10,7 +10,7 @@ pub(crate) type DocumentVersion = i32;
 /// The state for an individual document in the server. Stays up-to-date
 /// with changes made by the user, including unsaved changes.
 #[derive(Debug, Clone)]
-pub struct Document {
+pub struct TextDocument {
     /// The string contents of the document.
     contents: String,
     /// A computed line index for the document. This should always reflect
@@ -22,7 +22,7 @@ pub struct Document {
     version: DocumentVersion,
 }
 
-impl Document {
+impl TextDocument {
     pub fn new(contents: String, version: DocumentVersion) -> Self {
         let index = LineIndex::from_source_text(&contents);
         Self {

crates/ruff_server/src/edit/document.rs

@@ -0,0 +1,184 @@
+use std::{collections::HashMap, hash::BuildHasherDefault};
+
+use anyhow::Ok;
+use lsp_types::{NotebookCellKind, Url};
+use rustc_hash::FxHashMap;
+
+use crate::{PositionEncoding, TextDocument};
+
+use super::DocumentVersion;
+
+#[derive(Clone, Debug)]
+pub(crate) struct NotebookDocument {
+    cells: Vec<NotebookCell>,
+    metadata: ruff_notebook::RawNotebookMetadata,
+    version: DocumentVersion,
+    cell_index: FxHashMap<lsp_types::Url, usize>,
+}
+
+#[derive(Clone, Debug)]
+struct NotebookCell {
+    url: Url,
+    kind: NotebookCellKind,
+    document: TextDocument,
+}
+
+impl NotebookDocument {
+    pub(crate) fn new(
+        version: DocumentVersion,
+        cells: Vec<lsp_types::NotebookCell>,
+        metadata: serde_json::Map<String, serde_json::Value>,
+        cell_documents: Vec<lsp_types::TextDocumentItem>,
+    ) -> crate::Result<Self> {
+        let mut cell_contents: FxHashMap<_, _> = cell_documents
+            .into_iter()
+            .map(|document| (document.uri, document.text))
+            .collect();
+
+        let cells: Vec<_> = cells
+            .into_iter()
+            .map(|cell| {
+                let contents = cell_contents.remove(&cell.document).unwrap_or_default();
+                NotebookCell::new(cell, contents, version)
+            })
+            .collect();
+
+        Ok(Self {
+            version,
+            cell_index: Self::make_cell_index(cells.as_slice()),
+            metadata: serde_json::from_value(serde_json::Value::Object(metadata))?,
+            cells,
+        })
+    }
+
+    pub(crate) fn make_ruff_notebook(&self) -> ruff_notebook::Notebook {
+        let cells = self
+            .cells
+            .iter()
+            .map(|cell| match cell.kind {
+                NotebookCellKind::Code => ruff_notebook::Cell::Code(ruff_notebook::CodeCell {
+                    execution_count: None,
+                    id: None,
+                    metadata: serde_json::Value::Null,
+                    outputs: vec![],
+                    source: ruff_notebook::SourceValue::String(
+                        cell.document.contents().to_string(),
+                    ),
+                }),
+                NotebookCellKind::Markup => {
+                    ruff_notebook::Cell::Markdown(ruff_notebook::MarkdownCell {
+                        attachments: None,
+                        id: None,
+                        metadata: serde_json::Value::Null,
+                        source: ruff_notebook::SourceValue::String(
+                            cell.document.contents().to_string(),
+                        ),
+                    })
+                }
+            })
+            .collect();
+
+        ruff_notebook::Notebook::from_cells(cells, self.metadata.clone())
+            .expect("notebook should convert successfully")
+    }
+
+    pub(crate) fn update(
+        &mut self,
+        cells: Option<lsp_types::NotebookDocumentCellChange>,
+        metadata_change: Option<serde_json::Map<String, serde_json::Value>>,
+        version: DocumentVersion,
+        encoding: PositionEncoding,
+    ) -> crate::Result<()> {
+        self.version = version;
+
+        if let Some(lsp_types::NotebookDocumentCellChange {
+            structure,
+            data,
+            text_content,
+        }) = cells
+        {
+            if let Some(structure) = structure {
+                let start = usize::try_from(structure.array.start).unwrap();
+                let delete = usize::try_from(structure.array.delete_count).unwrap();
+                if delete > 0 {
+                    self.cells.drain(start..start + delete);
+                }
+                for cell in structure.array.cells.into_iter().flatten().rev() {
+                    self.cells
+                        .insert(start, NotebookCell::new(cell, String::new(), version));
+                }
+
+                // the array has been updated - rebuild the cell index
+                self.rebuild_cell_index();
+            }
+            if let Some(cell_data) = data {
+                for cell in cell_data {
+                    if let Some(existing_cell) = self.cell_by_uri_mut(&cell.document) {
+                        existing_cell.kind = cell.kind;
+                    }
+                }
+            }
+            if let Some(content_changes) = text_content {
+                for content_change in content_changes {
+                    if let Some(cell) = self.cell_by_uri_mut(&content_change.document.uri) {
+                        cell.document
+                            .apply_changes(content_change.changes, version, encoding);
+                    }
+                }
+            }
+        }
+        if let Some(metadata_change) = metadata_change {
+            self.metadata = serde_json::from_value(serde_json::Value::Object(metadata_change))?;
+        }
+        Ok(())
+    }
+
+    pub(crate) fn version(&self) -> DocumentVersion {
+        self.version
+    }
+
+    pub(crate) fn cell_uri_by_index(&self, index: usize) -> Option<&lsp_types::Url> {
+        self.cells.get(index).map(|cell| &cell.url)
+    }
+
+    pub(crate) fn cell_document_by_uri(&self, uri: &lsp_types::Url) -> Option<&TextDocument> {
+        self.cells
+            .get(*self.cell_index.get(uri)?)
+            .map(|cell| &cell.document)
+    }
+
+    pub(crate) fn urls(&self) -> impl Iterator<Item = &lsp_types::Url> {
+        self.cells.iter().map(|cell| &cell.url)
+    }
+
+    fn cell_by_uri_mut(&mut self, uri: &lsp_types::Url) -> Option<&mut NotebookCell> {
+        self.cells.get_mut(*self.cell_index.get(uri)?)
+    }
+
+    fn rebuild_cell_index(&mut self) {
+        self.cell_index = Self::make_cell_index(&self.cells);
+    }
+
+    fn make_cell_index(cells: &[NotebookCell]) -> FxHashMap<lsp_types::Url, usize> {
+        let mut index =
+            HashMap::with_capacity_and_hasher(cells.len(), BuildHasherDefault::default());
+        for (i, cell) in cells.iter().enumerate() {
+            index.insert(cell.url.clone(), i);
+        }
+        index
+    }
+}
+
+impl NotebookCell {
+    pub(crate) fn new(
+        cell: lsp_types::NotebookCell,
+        contents: String,
+        version: DocumentVersion,
+    ) -> Self {
+        Self {
+            url: cell.document,
+            kind: cell.kind,
+            document: TextDocument::new(contents, version),
+        }
+    }
+}