File indexing completed on 2024-05-12 17:22:29

 // cnumberparser.h
 // Complex number support : complex number parser using a recursive
 // descent approach.
 //
 // This file is part of the SpeedCrunch project
 // Copyright (C) 2013, 2015-2016 Hadrien Theveneau <theveneau@gmail.com>.
 //
 // This program 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 2
 // of the 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 General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License
 // along with this program; see the file COPYING.  If not, write to
 // the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 // Boston, MA 02110-1301, USA.
 
 
 // This complex number parser currently recognizes the following forms :
 //
 //   a
 //   a+ib
 //   a+jb
 //   a+bi
 //   a+bj
 //   ib
 //   jb
 //   bi
 //   bj
 //
 // The grammar describing one complex number is:
 //
 //   complex_number -> part suite
 //   suite -> []
 //   suite -> + part suite
 //
 //   part -> prefixed_part
 //   part -> postfixed_part
 //
 //   part_prefixed -> i base_number
 //   part_prefixed -> j base_number
 //
 //   part_postfixed -> base_number postfix
 //
 //   postfix -> i
 //   postfix -> j
 //   postfix -> []
 
 
 #ifndef CNUMBER_PARSER_HXX
 #define CNUMBER_PARSER_HXX
 
 #include <ctype.h>
 #include <string.h>
 
 #include "hmath.h"
 #include "cmath.h"
 
 class CNumberParser {
   private:
     const char * str;  /* Remaining of the string to parse */
 
     /* Parsing functions. */
     void accept () {str++;}
     /* Each of the following function parses one producion of the grammar. */
     CNumber part ();
     CNumber suite ();
     CNumber part_prefixed ();
     HNumber base_number ();
     CNumber part_postfixed ();
     typedef enum {IMAG, REAL} postfix_t;
     postfix_t postfix ();
 
   public:
     CNumberParser (const char * _str);
     void parse (CNumber * number);
 };
 
 namespace CNumberParserExceptions {
 
   class Exception
       : public std::exception {};
 
   class UnexpectedSymbol
       : public Exception {
     private:
       char symbol;
     public:
       char get_symbol () {return symbol;}
       UnexpectedSymbol (char _symbol) : symbol(_symbol) {}
       /* FIXME ! Error message ! */
   };
 
   class LogicError
       : Exception {};
 
   class UnexpectedEnd
       : public Exception {};
 
 }
 
 #endif // CNUMBER_PARSER_HXX