/*  GRAPHITE2 LICENSING

    Copyright 2011, SIL International
    All rights reserved.

    This library is free software; you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published
    by the Free Software Foundation; either version 2.1 of License, or
    (at your option) any later version.

    This program 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
    Lesser General Public License for more details.

    You should also have received a copy of the GNU Lesser General Public
    License along with this library in the file named "LICENSE".
    If not, write to the Free Software Foundation, 51 Franklin Street,
    Suite 500, Boston, MA 02110-1335, USA or visit their web page on the
    internet at http://www.fsf.org/licenses/lgpl.html.

Alternatively, the contents of this file may be used under the terms of the
Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public
License, as published by the Free Software Foundation, either version 2
of the License or (at your option) any later version.
*/
// JSON pretty printer for graphite font debug output logging.
// Created on: 15 Dec 2011
//     Author: Tim Eves

#pragma once
#include "inc/Main.h"
#include <cassert>
#include <stdio.h>

namespace graphite2 {

class json
{
    // Prevent copying
    json(const json &);
    json & operator = (const json &);

    typedef void (*_context_t)(json &);
    class _null_t {};

    FILE * const    _stream;
    char            _contexts[128], // context stack
                  * _context,       // current context (top of stack)
                  * _flatten;       // if !0 points to context above which
                                    //  pretty printed output should occur.

    void context(const char current) throw();
    void indent(const int d=0) throw();
    void push_context(const char, const char) throw();
    void pop_context() throw();

public:
    class closer;

    typedef const char *    string;
    typedef double          number;
    typedef long signed int integer;
    typedef bool            boolean;
    static const _null_t    null;

    static void flat(json &) throw();
    static void close(json &) throw();
    static void object(json &) throw();
    static void array(json &) throw();
    static void item(json &) throw();

    json(FILE * stream) throw();
    ~json() throw ();

    FILE * stream() const throw();

    json & operator << (string) throw();
    json & operator << (number) throw();
    json & operator << (integer) throw();
    json & operator << (long unsigned int d) throw();
    json & operator << (boolean) throw();
    json & operator << (_null_t) throw();
    json & operator << (_context_t) throw();

    operator bool() const throw();
    bool good() const throw();
    bool eof() const throw();

    CLASS_NEW_DELETE;
};

class json::closer
{
    // Prevent copying.
    closer(const closer &);
    closer & operator = (const closer &);

    json * const    _j;
public:
    closer(json * const j) : _j(j) {}
    ~closer() throw() { if (_j)  *_j << close; }
};

inline
json::json(FILE * s) throw()
: _stream(s), _context(_contexts), _flatten(0)
{
    if (good())
        fflush(s);
}


inline
json::~json() throw ()
{
    while (_context > _contexts)    pop_context();
}

inline
FILE * json::stream() const throw()     { return _stream; }


inline
json & json::operator << (json::_context_t ctxt) throw()
{
    ctxt(*this);
    return *this;
}

inline
json & operator << (json & j, signed char d) throw()        { return j << json::integer(d); }

inline
json & operator << (json & j, short signed int d) throw()   { return j << json::integer(d); }

inline
json & operator << (json & j, signed int d) throw()         { return j << json::integer(d); }

inline
json & operator << (json & j, unsigned char d) throw()      { return j << json::integer(d); }

inline
json & operator << (json & j, short unsigned int d) throw() { return j << json::integer(d); }

inline
json & operator << (json & j, unsigned int d) throw()       { return j << json::integer(d); }

inline
json & operator << (json & j, char c) throw ()
{
    const char str[2] = {c,0};
    return j << str;
}

inline
json::operator bool() const throw()     { return good(); }

inline
bool json::good() const throw()         { return _stream && ferror(_stream) == 0; }

inline
bool json::eof() const throw()          { return feof(_stream) != 0; }

} // namespace graphite2
