config/CConfigFile.h

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/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          https://www.mrpt.org/                         |
   |                                                                        |
   | Copyright (c) 2005-2020, Individual contributors, see AUTHORS file     |
   | See: https://www.mrpt.org/Authors - All rights reserved.               |
   | Released under BSD License. See: https://www.mrpt.org/License          |
   +------------------------------------------------------------------------+ */
#pragma once

#include <mrpt/config/CConfigFileBase.h>
#include <mrpt/core/pimpl.h>

namespace mrpt::config
{
/** This class allows loading and storing values and vectors of different types
 * from ".ini" files easily.
 *  The contents of the file will be modified by "write" operations in memory,
 * and will be saved back
 *   to the file at the destructor, and only if at least one write operation
 * has been applied.
 *
 * Use base class `CConfigFileBase`'s methods
 * `read_{int,float,double,string,...}()` and `write()` to actually read and
 * write values.
 *
 * See: \ref config_file_format
 *
 * \ingroup mrpt_config_grp
 */
class CConfigFile : public CConfigFileBase
{
   private:
    /** The name of the file */
    std::string m_file;
    /** The interface to the file: */
    struct Impl;
    mrpt::pimpl<Impl> m_impl;
    /** If modified since load. */
    bool m_modified;

   protected:
    /** A virtual method to write a generic string  */
    void writeString(
        const std::string& section, const std::string& name,
        const std::string& str) override;

    /** A virtual method to read a generic string.
     * \exception std::exception If the key name is not found and
     * "failIfNotFound" is true. Otherwise the "defaultValue" is returned. */
    std::string readString(
        const std::string& section, const std::string& name,
        const std::string& defaultStr,
        bool failIfNotFound = false) const override;

   public:
    /** Constructor that opens a configuration file. */
    CConfigFile(const std::string& fileName);

    /** Constructor, does not open any file. You should call "setFileName"
     * before reading or writting or otherwise nothing will be read and write
     * operations will be eventually lost.
     * However, it's perfectly right to use this object without an associated
     * file, in which case it will behave as an "in-memory" file.
     */
    CConfigFile();

    /** Associate this object with the given file, so future read/write
     * operations will be applied to that file (it's synchronized at
     * destruction) */
    void setFileName(const std::string& fil_path);

    /** Dumps the changes to the physical configuration file now, not waiting
     * until destruction. */
    void writeNow();

    /** Discard saving (current) changes to physical file upon destruction */
    void discardSavingChanges();

    /** Returns the file currently open by this object. */
    std::string getAssociatedFile() const { return m_file; }
    /** Destructor */
    ~CConfigFile() override;

    /** Returns a list with all the section names. */
    void getAllSections(std::vector<std::string>& sections) const override;

    /** Empties the "config file" */
    void clear() override;

    /** Returs a list with all the keys into a section. */
    void getAllKeys(const std::string& section, std::vector<std::string>& keys)
        const override;

};  // End of class def.

}  // namespace mrpt::config