LibJS: Parse and partially execute import and export statements

We produce the import and export entries as per the spec. However we do
not yet verify that named things that are exported are declared
somewhere.

Userland/Libraries/LibJS/AST.cpp

@@ -2434,4 +2434,72 @@ void ScopeNode::add_hoisted_function(NonnullRefPtr<FunctionDeclaration> hoisted_
 {
     m_hoisted_functions.append(hoisted_function);
 }
+
+Value ImportStatement::execute(Interpreter& interpreter, GlobalObject&) const
+{
+    InterpreterNodeScope node_scope { interpreter, *this };
+    dbgln("Modules are not fully supported yet!");
+    TODO();
+    return {};
+}
+
+Value ExportStatement::execute(Interpreter& interpreter, GlobalObject& global_object) const
+{
+    InterpreterNodeScope node_scope { interpreter, *this };
+    if (m_statement)
+        return m_statement->execute(interpreter, global_object);
+
+    return {};
+}
+
+void ExportStatement::dump(int indent) const
+{
+    ASTNode::dump(indent);
+    print_indent(indent + 1);
+    outln("(ExportEntries)");
+
+    auto string_or_null = [](String const& string) -> String {
+        if (string.is_empty()) {
+            return "null";
+        }
+        return String::formatted("\"{}\"", string);
+    };
+
+    for (auto& entry : m_entries) {
+        print_indent(indent + 2);
+        outln("ModuleRequest: {}, ImportName: {}, LocalName: {}, ExportName: {}", string_or_null(entry.module_request), entry.kind == ExportEntry::ModuleRequest ? string_or_null(entry.local_or_import_name) : "null", entry.kind != ExportEntry::ModuleRequest ? string_or_null(entry.local_or_import_name) : "null", string_or_null(entry.export_name));
+    }
+}
+
+void ImportStatement::dump(int indent) const
+{
+    ASTNode::dump(indent);
+    print_indent(indent + 1);
+    if (m_entries.is_empty()) {
+        // direct from "module" import
+        outln("Entire module '{}'", m_module_request);
+    } else {
+        outln("(ExportEntries) from {}", m_module_request);
+
+        for (auto& entry : m_entries) {
+            print_indent(indent + 2);
+            outln("ImportName: {}, LocalName: {}", entry.import_name, entry.local_name);
+        }
+    }
+}
+
+bool ExportStatement::has_export(StringView export_name) const
+{
+    return any_of(m_entries.begin(), m_entries.end(), [&](auto& entry) {
+        return entry.export_name == export_name;
+    });
+}
+
+bool ImportStatement::has_bound_name(StringView name) const
+{
+    return any_of(m_entries.begin(), m_entries.end(), [&](auto& entry) {
+        return entry.local_name == name;
+    });
+}
+
 }