add hw2

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

@@ -0,0 +1,46 @@
+/******************************************************************************
+ * 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 { findDeclarationNodeAtOffset } from '../utils/cst-utils.js';
+export class AstNodeHoverProvider {
+    constructor(services) {
+        this.references = services.references.References;
+        this.grammarConfig = services.parser.GrammarConfig;
+    }
+    getHoverContent(document, params) {
+        var _a, _b;
+        const rootNode = (_b = (_a = document.parseResult) === null || _a === void 0 ? void 0 : _a.value) === null || _b === void 0 ? void 0 : _b.$cstNode;
+        if (rootNode) {
+            const offset = document.textDocument.offsetAt(params.position);
+            const cstNode = findDeclarationNodeAtOffset(rootNode, offset, this.grammarConfig.nameRegexp);
+            if (cstNode && cstNode.offset + cstNode.length > offset) {
+                const targetNode = this.references.findDeclaration(cstNode);
+                if (targetNode) {
+                    return this.getAstNodeHoverContent(targetNode);
+                }
+            }
+        }
+        return undefined;
+    }
+}
+export class MultilineCommentHoverProvider extends AstNodeHoverProvider {
+    constructor(services) {
+        super(services);
+        this.documentationProvider = services.documentation.DocumentationProvider;
+    }
+    getAstNodeHoverContent(node) {
+        const content = this.documentationProvider.getDocumentation(node);
+        if (content) {
+            return {
+                contents: {
+                    kind: 'markdown',
+                    value: content
+                }
+            };
+        }
+        return undefined;
+    }
+}
+//# sourceMappingURL=hover-provider.js.map