92 lines
3.5 KiB
C++
92 lines
3.5 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _INIT_PARSER_H_
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#define _INIT_PARSER_H_
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#include <map>
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#include <memory>
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#include <string>
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#include <vector>
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#include "result.h"
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// SectionParser is an interface that can parse a given 'section' in init.
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//
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// You can implement up to 4 functions below, with ParseSection() being mandatory.
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// The first two function return bool with false indicating a failure and has a std::string* err
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// parameter into which an error string can be written. It will be reported along with the
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// filename and line number of where the error occurred.
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//
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// 1) bool ParseSection(std::vector<std::string>&& args, const std::string& filename,
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// int line, std::string* err)
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// This function is called when a section is first encountered.
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//
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// 2) bool ParseLineSection(std::vector<std::string>&& args, int line, std::string* err)
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// This function is called on each subsequent line until the next section is encountered.
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//
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// 3) bool EndSection()
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// This function is called either when a new section is found or at the end of the file.
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// It indicates that parsing of the current section is complete and any relevant objects should
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// be committed.
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//
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// 4) bool EndFile()
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// This function is called at the end of the file.
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// It indicates that the parsing has completed and any relevant objects should be committed.
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namespace android {
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namespace init {
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class SectionParser {
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public:
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virtual ~SectionParser() {}
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virtual Result<Success> ParseSection(std::vector<std::string>&& args,
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const std::string& filename, int line) = 0;
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virtual Result<Success> ParseLineSection(std::vector<std::string>&&, int) { return Success(); };
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virtual void EndSection(){};
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virtual void EndFile(){};
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};
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class Parser {
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public:
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// LineCallback is the type for callbacks that can parse a line starting with a given prefix.
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//
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// They take the form of bool Callback(std::vector<std::string>&& args, std::string* err)
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//
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// Similar to ParseSection() and ParseLineSection(), this function returns bool with false
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// indicating a failure and has an std::string* err parameter into which an error string can
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// be written.
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using LineCallback = std::function<Result<Success>(std::vector<std::string>&&)>;
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Parser();
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bool ParseConfig(const std::string& path);
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void AddSectionParser(const std::string& name, std::unique_ptr<SectionParser> parser);
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void AddSingleLineParser(const std::string& prefix, LineCallback callback);
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private:
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void ParseData(const std::string& filename, const std::string& data);
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bool ParseConfigFile(const std::string& path);
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bool ParseConfigDir(const std::string& path);
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std::map<std::string, std::unique_ptr<SectionParser>> section_parsers_;
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std::vector<std::pair<std::string, LineCallback>> line_callbacks_;
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};
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} // namespace init
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} // namespace android
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#endif
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