add hw2

node_modules/langium/lib/lsp/references-provider.js

@@ -0,0 +1,37 @@
+/******************************************************************************
+ * Copyright 2021 TypeFox GmbH
+ * This program and the accompanying materials are made available under the
+ * terms of the MIT License, which is available in the project root.
+ ******************************************************************************/
+import { Location } from 'vscode-languageserver';
+import { findDeclarationNodeAtOffset } from '../utils/cst-utils.js';
+export class DefaultReferencesProvider {
+    constructor(services) {
+        this.nameProvider = services.references.NameProvider;
+        this.references = services.references.References;
+        this.grammarConfig = services.parser.GrammarConfig;
+    }
+    findReferences(document, params, _cancelToken) {
+        const rootNode = document.parseResult.value.$cstNode;
+        if (!rootNode) {
+            return [];
+        }
+        const selectedNode = findDeclarationNodeAtOffset(rootNode, document.textDocument.offsetAt(params.position), this.grammarConfig.nameRegexp);
+        if (!selectedNode) {
+            return [];
+        }
+        return this.getReferences(selectedNode, params, document);
+    }
+    getReferences(selectedNode, params, _document) {
+        const locations = [];
+        const targetAstNode = this.references.findDeclaration(selectedNode);
+        if (targetAstNode) {
+            const options = { includeDeclaration: params.context.includeDeclaration };
+            this.references.findReferences(targetAstNode, options).forEach(reference => {
+                locations.push(Location.create(reference.sourceUri.toString(), reference.segment.range));
+            });
+        }
+        return locations;
+    }
+}
+//# sourceMappingURL=references-provider.js.map