init: Use classes for parsing and clean up memory allocations
Create a Parser class that uses multiple SectionParser interfaces to
handle parsing the different sections of an init rc.
Create an ActionParser and ServiceParser that implement SectionParser
and parse the sections corresponding to Action and Service
classes.
Remove the legacy keyword structure and replace it with std::map's
that map keyword -> (minimum args, maximum args, function pointer) for
Commands and Service Options.
Create an ImportParser that implements SectionParser and handles the
import 'section'.
Clean up the unsafe memory handling of the Action class by using
std::unique_ptr.
Change-Id: Ic5ea5510cb956dbc3f78745a35096ca7d6da7085
diff --git a/init/keyword_map.h b/init/keyword_map.h
new file mode 100644
index 0000000..dc2357b
--- /dev/null
+++ b/init/keyword_map.h
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _INIT_KEYWORD_MAP_H_
+#define _INIT_KEYWORD_MAP_H_
+
+#include <map>
+#include <string>
+
+#include <base/stringprintf.h>
+
+template <typename Function>
+class KeywordMap {
+public:
+ using FunctionInfo = std::tuple<std::size_t, std::size_t, Function>;
+ using Map = const std::map<std::string, FunctionInfo>;
+
+ virtual ~KeywordMap() {
+ }
+
+ const Function FindFunction(const std::string& keyword,
+ size_t num_args,
+ std::string* err) const {
+ using android::base::StringPrintf;
+
+ auto function_info_it = map().find(keyword);
+ if (function_info_it == map().end()) {
+ *err = StringPrintf("invalid keyword '%s'", keyword.c_str());
+ return nullptr;
+ }
+
+ auto function_info = function_info_it->second;
+
+ auto min_args = std::get<0>(function_info);
+ auto max_args = std::get<1>(function_info);
+ if (min_args == max_args && num_args != min_args) {
+ *err = StringPrintf("%s requires %zu argument%s",
+ keyword.c_str(), min_args,
+ (min_args > 1 || min_args == 0) ? "s" : "");
+ return nullptr;
+ }
+
+ if (num_args < min_args || num_args > max_args) {
+ if (max_args == std::numeric_limits<decltype(max_args)>::max()) {
+ *err = StringPrintf("%s requires at least %zu argument%s",
+ keyword.c_str(), min_args,
+ min_args > 1 ? "s" : "");
+ } else {
+ *err = StringPrintf("%s requires between %zu and %zu arguments",
+ keyword.c_str(), min_args, max_args);
+ }
+ return nullptr;
+ }
+
+ return std::get<Function>(function_info);
+ }
+
+private:
+//Map of keyword ->
+//(minimum number of arguments, maximum number of arguments, function pointer)
+ virtual Map& map() const = 0;
+};
+
+#endif