feat: implemented provideDocumentHighlights

Author: johnsoncodehk

src/monaco/code2monaco.ts

@@ -364,3 +364,23 @@ export function asSymbolKind(kind: vscode.SymbolKind): monaco.languages.SymbolKi
             return monaco.languages.SymbolKind.File;
     }
 }
+
+export function asDocumentHighlight(highlight: vscode.DocumentHighlight): monaco.languages.DocumentHighlight {
+    return {
+        range: asRange(highlight.range),
+        kind: asDocumentHighlightKind(highlight.kind),
+    };
+}
+
+export function asDocumentHighlightKind(kind: vscode.DocumentHighlightKind | undefined): monaco.languages.DocumentHighlightKind {
+    switch (kind) {
+        case vscode.DocumentHighlightKind.Text:
+            return monaco.languages.DocumentHighlightKind.Text;
+        case vscode.DocumentHighlightKind.Read:
+            return monaco.languages.DocumentHighlightKind.Read;
+        case vscode.DocumentHighlightKind.Write:
+            return monaco.languages.DocumentHighlightKind.Write;
+        default:
+            return monaco.languages.DocumentHighlightKind.Text;
+    }
+}

src/monaco/ls.ts

@@ -261,6 +261,17 @@ export async function setupLs(modelsMap: Ref<Map<string, monaco.editor.ITextMode
                 }
             },
         }),
+        monaco.languages.registerDocumentHighlightProvider(lang, {
+            provideDocumentHighlights: async (model, position) => {
+                const codeResult = await ls.findDocumentHighlights(
+                    model.uri.toString(),
+                    monaco2code.asPosition(position),
+                );
+                if (codeResult) {
+                    return codeResult.map(code2monaco.asDocumentHighlight);
+                }
+            },
+        }),
         monaco.languages.registerCompletionItemProvider(lang, {
             // https://github.com/johnsoncodehk/volar/blob/2f786182250d27e99cc3714fbfc7d209616e2289/packages/vue-language-server/src/registers/registerlanguageFeatures.ts#L57
             triggerCharacters: '!@#$%^&*()_+-=`~{}|[]\:";\'<>?,./ '.split(''),