Add support for YAML selection ranges

src/index.ts

@@ -11,6 +11,7 @@ import {
   toLink,
   toLocationLink,
   toMarkerData,
+  toSelectionRanges,
   toTextEdit
 } from 'monaco-languageserver-types'
 import { registerMarkerDataProvider } from 'monaco-marker-data-provider'
@@ -311,6 +312,18 @@ export function configureMonacoYaml(monaco: MonacoEditor, options: MonacoYamlOpt
           action: { indentAction: monaco.languages.IndentAction.Indent }
         }
       ]
+    }),
+
+    monaco.languages.registerSelectionRangeProvider('yaml', {
+      async provideSelectionRanges(model, positions) {
+        const worker = await workerManager.getWorker(model.uri)
+        const selectionRanges = await worker.getSelectionRanges(
+          String(model.uri),
+          positions.map(fromPosition)
+        )
+
+        return selectionRanges?.map(toSelectionRanges)
+      }
     })
   ]
 

src/yaml.worker.ts

@@ -12,6 +12,7 @@ import {
   type LocationLink,
   type Position,
   type Range,
+  type SelectionRange,
   type TextEdit
 } from 'vscode-languageserver-types'
 import { type Telemetry } from 'yaml-language-server/lib/esm/languageservice/telemetry.js'
@@ -91,6 +92,11 @@ export interface YAMLWorker {
    * Get folding ranges in a YAML document.
    */
   getFoldingRanges: (uri: string) => FoldingRange[] | null | undefined
+
+  /**
+   * Get selection ranges in a YAML document
+   */
+  getSelectionRanges: (uri: string, positions: Position[]) => SelectionRange[] | undefined
 }
 
 const telemetry: Telemetry = {
@@ -162,6 +168,8 @@ initialize<YAMLWorker, MonacoYamlOptions>((ctx, { enableSchemaRequest, ...langua
 
     getFoldingRanges: withDocument((document) =>
       ls.getFoldingRanges(document, { lineFoldingOnly: true })
-    )
+    ),
+
+    getSelectionRanges: withDocument(ls.getSelectionRanges)
   }
 })