fix(lsp): compare only the formatted range on range formatting

.changeset/eleven-feet-heal.md

@@ -0,0 +1,5 @@
+---
+"@biomejs/biome": patch
+---
+
+Fixed [#2260](https://github.com/biomejs/biome/2260): The LSP server now returns correct text edits for the specified range in `textDocument/rangeFormatting` and `textDocument/onTypeFormatting` requests.

crates/biome_lsp/src/handlers/formatting.rs

@@ -4,7 +4,7 @@ use crate::utils::text_edit;
 use anyhow::Context;
 use biome_fs::BiomePath;
 use biome_lsp_converters::from_proto;
-use biome_rowan::{TextRange, TextSize};
+use biome_rowan::{TextLen, TextRange, TextSize};
 use biome_service::file_handlers::{AstroFileHandler, SvelteFileHandler, VueFileHandler};
 use biome_service::workspace::{
     CheckFileSizeParams, FeaturesBuilder, FileFeaturesResult, FormatFileParams, FormatOnTypeParams,
@@ -149,14 +149,19 @@ pub(crate) fn format_range(
             range: format_range,
         })?;
 
-        let indels =
-            biome_text_edit::TextEdit::from_unicode_words(content.as_str(), formatted.as_code());
+        let formatted_range = formatted
+            .range()
+            .unwrap_or_else(|| TextRange::up_to(content.text_len()));
+        let indels = biome_text_edit::TextEdit::from_unicode_words(
+            &content.as_str()[formatted_range],
+            formatted.as_code(),
+        );
         let position_encoding = session.position_encoding();
         let edits = text_edit(
             &doc.line_index,
             indels,
             position_encoding,
-            Some(format_range.start().into()),
+            Some(formatted_range.start().into()),
         )?;
 
         Ok(Some(edits))
@@ -217,13 +222,18 @@ pub(crate) fn format_on_type(
             path: path.clone(),
         })?;
 
-        let indels =
-            biome_text_edit::TextEdit::from_unicode_words(content.as_str(), formatted.as_code());
+        let formatted_range = formatted
+            .range()
+            .unwrap_or_else(|| TextRange::up_to(content.text_len()));
+        let indels = biome_text_edit::TextEdit::from_unicode_words(
+            &content.as_str()[formatted_range],
+            formatted.as_code(),
+        );
         let edits = text_edit(
             &doc.line_index,
             indels,
             position_encoding,
-            Some(offset.into()),
+            Some(formatted_range.start().into()),
         )?;
         Ok(Some(edits))
     } else {

crates/biome_lsp/src/server.tests.rs

@@ -793,6 +793,72 @@ async fn document_no_extension() -> Result<()> {
     Ok(())
 }
 
+#[tokio::test]
+async fn document_range_formatting() -> Result<()> {
+    let factory = ServerFactory::default();
+    let (service, client) = factory.create().into_inner();
+    let (stream, sink) = client.split();
+    let mut server = Server::new(service);
+
+    let (sender, _) = channel(CHANNEL_BUFFER_SIZE);
+    let reader = tokio::spawn(client_handler(stream, sink, sender));
+
+    server.initialize().await?;
+    server.initialized().await?;
+
+    server
+        .notify(
+            "textDocument/didOpen",
+            DidOpenTextDocumentParams {
+                text_document: TextDocumentItem {
+                    uri: uri!("document.js"),
+                    language_id: String::from("javascript"),
+                    version: 0,
+                    text: String::from("doNotFormatHere()\nformatHere()\ndoNotFormatHere()\n"),
+                },
+            },
+        )
+        .await?;
+
+    let res: Option<Vec<TextEdit>> = server
+        .request(
+            "textDocument/rangeFormatting",
+            "formatting",
+            DocumentRangeFormattingParams {
+                text_document: TextDocumentIdentifier {
+                    uri: uri!("document.js"),
+                },
+                range: Range::new(Position::new(1, 0), Position::new(2, 0)),
+                options: FormattingOptions {
+                    tab_size: 4,
+                    insert_spaces: false,
+                    properties: HashMap::default(),
+                    trim_trailing_whitespace: None,
+                    insert_final_newline: None,
+                    trim_final_newlines: None,
+                },
+                work_done_progress_params: WorkDoneProgressParams {
+                    work_done_token: None,
+                },
+            },
+        )
+        .await?
+        .context("formatting returned None")?;
+
+    assert_eq!(
+        res.context("formatting did not return an edit list")?,
+        vec![TextEdit::new(
+            Range::new(Position::new(1, 12), Position::new(1, 12)),
+            ";".to_string()
+        )]
+    );
+
+    server.shutdown().await?;
+    reader.abort();
+
+    Ok(())
+}
+
 #[tokio::test]
 async fn pull_diagnostics() -> Result<()> {
     let factory = ServerFactory::default();