add hw2

node_modules/langium/lib/utils/grammar-loader.js

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+/******************************************************************************
+ * Copyright 2023 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 { createDefaultCoreModule, createDefaultSharedCoreModule } from '../default-module.js';
+import { inject } from '../dependency-injection.js';
+import * as ast from '../languages/generated/ast.js';
+import { EmptyFileSystem } from '../workspace/file-system-provider.js';
+import { URI } from './uri-utils.js';
+const minimalGrammarModule = {
+    Grammar: () => undefined,
+    LanguageMetaData: () => ({
+        caseInsensitive: false,
+        fileExtensions: ['.langium'],
+        languageId: 'langium'
+    })
+};
+const minimalSharedGrammarModule = {
+    AstReflection: () => new ast.LangiumGrammarAstReflection()
+};
+function createMinimalGrammarServices() {
+    const shared = inject(createDefaultSharedCoreModule(EmptyFileSystem), minimalSharedGrammarModule);
+    const grammar = inject(createDefaultCoreModule({ shared }), minimalGrammarModule);
+    shared.ServiceRegistry.register(grammar);
+    return grammar;
+}
+/**
+ * Load a Langium grammar for your language from a JSON string. This is used by several services,
+ * most notably the parser builder which interprets the grammar to create a parser.
+ */
+export function loadGrammarFromJson(json) {
+    var _a;
+    const services = createMinimalGrammarServices();
+    const astNode = services.serializer.JsonSerializer.deserialize(json);
+    services.shared.workspace.LangiumDocumentFactory.fromModel(astNode, URI.parse(`memory://${(_a = astNode.name) !== null && _a !== void 0 ? _a : 'grammar'}.langium`));
+    return astNode;
+}
+//# sourceMappingURL=grammar-loader.js.map