mirror of https://gitlab.com/rnger/amath
112 lines
3.6 KiB
C++
112 lines
3.6 KiB
C++
/*
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* Copyright (c) 2015-2017 Carsten Sonne Larsen <cs@innolan.dk>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef _NUMERAL_H
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#define _NUMERAL_H
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/**
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* @file ntext.h
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* @brief Text to numbers handling.
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*
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* Converts both between text and numbers AND between numbers and text.
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*
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*/
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#include "lib/numb.h"
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#include "lib/charbuf.h"
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/**
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* @brief Base class for all numeral systems.
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*
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* More info on numeral systems is available at Wikipedia:
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* http://en.wikipedia.org/wiki/Numeral_system
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*
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*/
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class NumeralSystem {
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public:
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NumeralSystem();
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virtual ~NumeralSystem();
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virtual const char* GetName() = 0;
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virtual const char* GetPrefix() = 0;
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virtual unsigned int GetDigits() = 0;
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virtual void SetDigits(unsigned int digits) = 0;
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virtual const char GetFractionPoint() = 0;
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virtual void SetFractionPoint(const char fractionpoint) = 0;
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virtual const char* GetText(Number *number) = 0;
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virtual Number* Parse(const char *text, unsigned int *length, char **end) = 0;
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virtual Number* Parse(const char *text);
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protected:
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CharBuffer *buf;
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};
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/**
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* @brief Base class for all numeral systems with a
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* positional notation.
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*
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* More info on positional notation is available at Wikipedia:
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* http://en.wikipedia.org/wiki/Positional_notation
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*
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*/
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class PositionalNumeralSystem : public NumeralSystem {
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public:
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PositionalNumeralSystem(unsigned int base, unsigned int digits, const char fractionpoint);
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~PositionalNumeralSystem();
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virtual const char* GetName();
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virtual const char* GetPrefix();
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virtual unsigned int GetDigits();
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virtual void SetDigits(unsigned int digits);
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virtual const char GetFractionPoint();
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virtual void SetFractionPoint(const char fractionpoint);
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virtual const char* GetText(Number *number);
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virtual Number* Parse(const char *text, unsigned int *length, char** end);
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protected:
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double base;
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unsigned int digits;
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char fractionpoint;
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private:
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const char* GetText(double number);
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void IntegerToBuffer(double value, unsigned int digits, int *outdigits) ;
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};
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class DecimalSystem : public PositionalNumeralSystem {
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public:
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DecimalSystem();
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DecimalSystem(unsigned int digits);
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DecimalSystem(unsigned int digits, const char fractionpoint);
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~DecimalSystem();
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virtual const char* GetText(Number *number);
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private:
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const char *GetRealText(double value);
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};
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#endif
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