add hw2

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

@@ -0,0 +1,27 @@
+/******************************************************************************
+ * Copyright 2022 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 { CancellationToken } from '../utils/cancellation.js';
+import { findDeclarationNodeAtOffset } from '../utils/cst-utils.js';
+export class AbstractGoToImplementationProvider {
+    constructor(services) {
+        this.references = services.references.References;
+        this.grammarConfig = services.parser.GrammarConfig;
+    }
+    getImplementation(document, params, cancelToken = CancellationToken.None) {
+        const rootNode = document.parseResult.value;
+        if (rootNode.$cstNode) {
+            const sourceCstNode = findDeclarationNodeAtOffset(rootNode.$cstNode, document.textDocument.offsetAt(params.position), this.grammarConfig.nameRegexp);
+            if (sourceCstNode) {
+                const nodeDeclaration = this.references.findDeclaration(sourceCstNode);
+                if (nodeDeclaration) {
+                    return this.collectGoToImplementationLocationLinks(nodeDeclaration, cancelToken);
+                }
+            }
+        }
+        return undefined;
+    }
+}
+//# sourceMappingURL=implementation-provider.js.map