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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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#ifndef _INIT_PARSER_H_
#define _INIT_PARSER_H_
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "result.h"
// 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
// functions return Result<Success> indicating if they have an error. It will be reported along
// with the filename and line number of where the error occurred.
// 1) ParseSection
// This function is called when a section is first encountered.
// 2) ParseLineSection
// This function is called on each subsequent line until the next section is encountered.
// 3) 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) 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 {
virtual ~SectionParser() {}
virtual Result<Success> ParseSection(std::vector<std::string>&& args,
const std::string& filename, int line) = 0;
virtual Result<Success> ParseLineSection(std::vector<std::string>&&, int) { return Success(); };
virtual Result<Success> EndSection() { return Success(); };
virtual void EndFile(){};
class Parser {
// 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<Result<Success>(std::vector<std::string>&&)>;
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 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_;
} // namespace init
} // namespace android