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/*
* Copyright (C) 2010 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_INIT_PARSER_H_
#define _INIT_INIT_PARSER_H_
#include <map>
#include <memory>
#include <string>
#include <vector>
// SectionParser is an interface that can parse a given 'section' in init.
//
// You can implement up to 4 functions below, with ParseSection() being mandatory.
// The first two function return bool with false indicating a failure and has a std::string* err
// parameter into which an error string can be written. It will be reported along with the
// filename and line number of where the error occurred.
//
// 1) bool ParseSection(std::vector<std::string>&& args, const std::string& filename,
// int line, std::string* err)
// This function is called when a section is first encountered.
//
// 2) bool ParseLineSection(std::vector<std::string>&& args, int line, std::string* err)
// This function is called on each subsequent line until the next section is encountered.
//
// 3) bool EndSection()
// This function is called either when a new section is found or at the end of the file.
// It indicates that parsing of the current section is complete and any relevant objects should
// be committed.
//
// 4) bool EndFile()
// This function is called at the end of the file.
// It indicates that the parsing has completed and any relevant objects should be committed.
namespace android {
namespace init {
class SectionParser {
public:
virtual ~SectionParser() {}
virtual bool ParseSection(std::vector<std::string>&& args, const std::string& filename,
int line, std::string* err) = 0;
virtual bool ParseLineSection(std::vector<std::string>&&, int, std::string*) { return true; };
virtual void EndSection(){};
virtual void EndFile(){};
};
class Parser {
public:
// LineCallback is the type for callbacks that can parse a line starting with a given prefix.
//
// They take the form of bool Callback(std::vector<std::string>&& args, std::string* err)
//
// Similar to ParseSection() and ParseLineSection(), this function returns bool with false
// indicating a failure and has an std::string* err parameter into which an error string can
// be written.
using LineCallback = std::function<bool(std::vector<std::string>&&, std::string*)>;
// TODO: init is the only user of this as a singleton; remove it.
static Parser& GetInstance();
Parser();
bool ParseConfig(const std::string& path);
void AddSectionParser(const std::string& name, std::unique_ptr<SectionParser> parser);
void AddSingleLineParser(const std::string& prefix, LineCallback callback);
void set_is_system_etc_init_loaded(bool loaded) { is_system_etc_init_loaded_ = loaded; }
void set_is_vendor_etc_init_loaded(bool loaded) { is_vendor_etc_init_loaded_ = loaded; }
void set_is_odm_etc_init_loaded(bool loaded) { is_odm_etc_init_loaded_ = loaded; }
bool is_system_etc_init_loaded() { return is_system_etc_init_loaded_; }
bool is_vendor_etc_init_loaded() { return is_vendor_etc_init_loaded_; }
bool is_odm_etc_init_loaded() { return is_odm_etc_init_loaded_; }
private:
void ParseData(const std::string& filename, const std::string& data);
bool ParseConfigFile(const std::string& path);
bool ParseConfigDir(const std::string& path);
std::map<std::string, std::unique_ptr<SectionParser>> section_parsers_;
std::vector<std::pair<std::string, LineCallback>> line_callbacks_;
bool is_system_etc_init_loaded_ = false;
bool is_vendor_etc_init_loaded_ = false;
bool is_odm_etc_init_loaded_ = false;
};
} // namespace init
} // namespace android
#endif
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