michael@0: /*  GRAPHITE2 LICENSING
michael@0: 
michael@0:     Copyright 2011, SIL International
michael@0:     All rights reserved.
michael@0: 
michael@0:     This library is free software; you can redistribute it and/or modify
michael@0:     it under the terms of the GNU Lesser General Public License as published
michael@0:     by the Free Software Foundation; either version 2.1 of License, or
michael@0:     (at your option) any later version.
michael@0: 
michael@0:     This program is distributed in the hope that it will be useful,
michael@0:     but WITHOUT ANY WARRANTY; without even the implied warranty of
michael@0:     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
michael@0:     Lesser General Public License for more details.
michael@0: 
michael@0:     You should also have received a copy of the GNU Lesser General Public
michael@0:     License along with this library in the file named "LICENSE".
michael@0:     If not, write to the Free Software Foundation, 51 Franklin Street,
michael@0:     Suite 500, Boston, MA 02110-1335, USA or visit their web page on the
michael@0:     internet at http://www.fsf.org/licenses/lgpl.html.
michael@0: 
michael@0: Alternatively, the contents of this file may be used under the terms of the
michael@0: Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public
michael@0: License, as published by the Free Software Foundation, either version 2
michael@0: of the License or (at your option) any later version.
michael@0: */
michael@0: // JSON pretty printer for graphite font debug output logging.
michael@0: // Created on: 15 Dec 2011
michael@0: //     Author: Tim Eves
michael@0: 
michael@0: #pragma once
michael@0: #include "inc/Main.h"
michael@0: #include <cassert>
michael@0: #include <stdio.h>
michael@0: 
michael@0: namespace graphite2 {
michael@0: 
michael@0: class json
michael@0: {
michael@0:     // Prevent copying
michael@0:     json(const json &);
michael@0:     json & operator = (const json &);
michael@0: 
michael@0:     typedef void (*_context_t)(json &);
michael@0:     class _null_t {};
michael@0: 
michael@0:     FILE * const    _stream;
michael@0:     char            _contexts[128], // context stack
michael@0:                   * _context,       // current context (top of stack)
michael@0:                   * _flatten;       // if !0 points to context above which
michael@0:                                     //  pretty printed output should occur.
michael@0: 
michael@0:     void context(const char current) throw();
michael@0:     void indent(const int d=0) throw();
michael@0:     void push_context(const char, const char) throw();
michael@0:     void pop_context() throw();
michael@0: 
michael@0: public:
michael@0:     class closer;
michael@0: 
michael@0:     typedef const char *    string;
michael@0:     typedef double          number;
michael@0:     typedef long signed int integer;
michael@0:     typedef bool            boolean;
michael@0:     static const _null_t    null;
michael@0: 
michael@0:     static void flat(json &) throw();
michael@0:     static void close(json &) throw();
michael@0:     static void object(json &) throw();
michael@0:     static void array(json &) throw();
michael@0:     static void item(json &) throw();
michael@0: 
michael@0:     json(FILE * stream) throw();
michael@0:     ~json() throw ();
michael@0: 
michael@0:     FILE * stream() const throw();
michael@0: 
michael@0:     json & operator << (string) throw();
michael@0:     json & operator << (number) throw();
michael@0:     json & operator << (integer) throw();
michael@0:     json & operator << (long unsigned int d) throw();
michael@0:     json & operator << (boolean) throw();
michael@0:     json & operator << (_null_t) throw();
michael@0:     json & operator << (_context_t) throw();
michael@0: 
michael@0:     operator bool() const throw();
michael@0:     bool good() const throw();
michael@0:     bool eof() const throw();
michael@0: 
michael@0:     CLASS_NEW_DELETE;
michael@0: };
michael@0: 
michael@0: class json::closer
michael@0: {
michael@0:     // Prevent copying.
michael@0:     closer(const closer &);
michael@0:     closer & operator = (const closer &);
michael@0: 
michael@0:     json * const    _j;
michael@0: public:
michael@0:     closer(json * const j) : _j(j) {}
michael@0:     ~closer() throw() { if (_j)  *_j << close; }
michael@0: };
michael@0: 
michael@0: inline
michael@0: json::json(FILE * s) throw()
michael@0: : _stream(s), _context(_contexts), _flatten(0)
michael@0: {
michael@0:     if (good())
michael@0:         fflush(s);
michael@0: }
michael@0: 
michael@0: 
michael@0: inline
michael@0: json::~json() throw ()
michael@0: {
michael@0:     while (_context > _contexts)    pop_context();
michael@0: }
michael@0: 
michael@0: inline
michael@0: FILE * json::stream() const throw()     { return _stream; }
michael@0: 
michael@0: 
michael@0: inline
michael@0: json & json::operator << (json::_context_t ctxt) throw()
michael@0: {
michael@0:     ctxt(*this);
michael@0:     return *this;
michael@0: }
michael@0: 
michael@0: inline
michael@0: json & operator << (json & j, signed char d) throw()        { return j << json::integer(d); }
michael@0: 
michael@0: inline
michael@0: json & operator << (json & j, short signed int d) throw()   { return j << json::integer(d); }
michael@0: 
michael@0: inline
michael@0: json & operator << (json & j, signed int d) throw()         { return j << json::integer(d); }
michael@0: 
michael@0: inline
michael@0: json & operator << (json & j, unsigned char d) throw()      { return j << json::integer(d); }
michael@0: 
michael@0: inline
michael@0: json & operator << (json & j, short unsigned int d) throw() { return j << json::integer(d); }
michael@0: 
michael@0: inline
michael@0: json & operator << (json & j, unsigned int d) throw()       { return j << json::integer(d); }
michael@0: 
michael@0: inline
michael@0: json & operator << (json & j, char c) throw ()
michael@0: {
michael@0:     const char str[2] = {c,0};
michael@0:     return j << str;
michael@0: }
michael@0: 
michael@0: inline
michael@0: json::operator bool() const throw()     { return good(); }
michael@0: 
michael@0: inline
michael@0: bool json::good() const throw()         { return _stream && ferror(_stream) == 0; }
michael@0: 
michael@0: inline
michael@0: bool json::eof() const throw()          { return feof(_stream) != 0; }
michael@0: 
michael@0: } // namespace graphite2