/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2011-2019 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.

    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.

    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.

Class
    Foam::Ostream

Description
    An Ostream is an abstract base class for all output systems
    (streams, files, token lists, etc).

SourceFiles
    Ostream.C

\*---------------------------------------------------------------------------*/

#ifndef Ostream_H
#define Ostream_H

#include "IOstream.H"
#include "keyType.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{

// Forward declaration of classes
class token;

/*---------------------------------------------------------------------------*\
                           Class Ostream Declaration
\*---------------------------------------------------------------------------*/

class Ostream
:
    public IOstream
{

protected:

    // Protected data

        //- Number of spaces per indent level
        static const unsigned short indentSize_ = 4;

        //- Indentation of the entry from the start of the keyword
        static const unsigned short entryIndentation_ = 16;

        //- Current indent level
        unsigned short indentLevel_;


public:

    // Constructors

        //- Set stream status
        Ostream
        (
            streamFormat format=ASCII,
            versionNumber version=currentVersion,
            compressionType compression=UNCOMPRESSED
        )
        :
            IOstream(format, version, compression),
            indentLevel_(0)
        {}


    //- Destructor
    virtual ~Ostream()
    {}


    // Member Functions

        // Write functions

            //- Write next token to stream
            virtual Ostream& write(const token&) = 0;

            //- Write character
            virtual Ostream& write(const char) = 0;

            //- Write character string
            virtual Ostream& write(const char*) = 0;

            //- Write word
            virtual Ostream& write(const word&) = 0;

            //- Write keyType
            //  write regular expression as quoted string
            //  write plain word as word (unquoted)
            virtual Ostream& write(const keyType&);

            //- Write string
            virtual Ostream& write(const string&) = 0;

            //- Write std::string surrounded by quotes.
            //  Optional write without quotes.
            virtual Ostream& writeQuoted
            (
                const std::string&,
                const bool quoted=true
            ) = 0;

            //- Write int32_t
            virtual Ostream& write(const int32_t) = 0;

            //- Write int64_t
            virtual Ostream& write(const int64_t) = 0;

            //- Write floatScalar
            virtual Ostream& write(const floatScalar) = 0;

            //- Write doubleScalar
            virtual Ostream& write(const doubleScalar) = 0;

            //- Write longDoubleScalar
            virtual Ostream& write(const longDoubleScalar) = 0;

            //- Write binary block
            virtual Ostream& write(const char*, std::streamsize) = 0;

            //- Add indentation characters
            virtual void indent() = 0;

            //- Return indent level
            unsigned short indentLevel() const
            {
                return indentLevel_;
            }

            //- Access to indent level
            unsigned short& indentLevel()
            {
                return indentLevel_;
            }

            //- Incrememt the indent level
            void incrIndent()
            {
                indentLevel_++;
            }

            //- Decrememt the indent level
            void decrIndent();

            //- Write the keyword followed by an appropriate indentation
            Ostream& writeKeyword(const keyType&);


        // Stream state functions

            //- Flush stream
            virtual void flush() = 0;

            //- Add newline and flush stream
            virtual void endl() = 0;

            //- Get width of output field
            virtual int width() const = 0;

            //- Set width of output field (and return old width)
            virtual int width(const int w) = 0;

            //- Get precision of output field
            virtual int precision() const = 0;

            //- Set precision of output field (and return old precision)
            virtual int precision(const int p) = 0;


    // Member Operators

        //- Return a non-const reference to const Ostream
        //  Needed for write functions where the stream argument is temporary:
        //  e.g. thing thisThing(OFstream("thingFileName")());
        Ostream& operator()() const
        {
            return const_cast<Ostream&>(*this);
        }
};


// --------------------------------------------------------------------
// ------ Manipulators (not taking arguments)
// --------------------------------------------------------------------

typedef Ostream& (*OstreamManip)(Ostream&);

//- operator<< handling for manipulators without arguments
inline Ostream& operator<<(Ostream& os, OstreamManip f)
{
    return f(os);
}

//- operator<< handling for manipulators without arguments
inline Ostream& operator<<(Ostream& os, IOstreamManip f)
{
    f(os);
    return os;
}


//- Indent stream
inline Ostream& indent(Ostream& os)
{
    os.indent();
    return os;
}

//- Increment the indent level
inline Ostream& incrIndent(Ostream& os)
{
    os.incrIndent();
    return os;
}

//- Decrement the indent level
inline Ostream& decrIndent(Ostream& os)
{
    os.decrIndent();
    return os;
}


//- Flush stream
inline Ostream& flush(Ostream& os)
{
    os.flush();
    return os;
}


//- Add newline and flush stream
inline Ostream& endl(Ostream& os)
{
    os.endl();
    return os;
}


// Useful aliases for tab and newline characters
static const char tab = '\t';
static const char nl = '\n';


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //
