mirror of https://gitlab.com/rnger/amath
426 lines
10 KiB
C++
426 lines
10 KiB
C++
/*-
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* Copyright (c) 2014-2018 Carsten Sonne Larsen <cs@innolan.net>
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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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* Project homepage:
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* https://amath.innolan.net
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*
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*/
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#include "amath.h"
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#include "amathc.h"
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#include "mathr.h"
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#include "mathi.h"
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#include "real.h"
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#include "cplex.h"
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#include "ntext.h"
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#include "ntextd.h"
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#include "charbuf.h"
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PositionalNumeralSystem::PositionalNumeralSystem(
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unsigned int base,
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unsigned int digits,
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const char fractionPoint) : base(base * 1.0), digits(digits)
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{
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this->fractionPoint = fractionPoint;
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}
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PositionalNumeralSystem::~PositionalNumeralSystem()
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{
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}
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const char *PositionalNumeralSystem::GetName()
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{
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switch (static_cast<int>(base))
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{
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case 2:
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return "binary";
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case 8:
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return "octal";
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case 10:
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return "decimal";
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case 16:
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return "hexadecimal";
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}
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const char *text = "base ";
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Number *n = new RealNumber(base);
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NumeralSystem *ns = new DecimalSystem(2);
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const char *numtext = ns->GetText(n);
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buf->EnsureSize(StrLen(text) + StrLen(numtext) + 1);
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buf->Empty();
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buf->Append(text);
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buf->Append(numtext);
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delete ns;
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delete n;
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return buf->GetString();
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}
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const char *PositionalNumeralSystem::GetPrefix()
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{
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// TODO: Consider using prefix with numral systems != base 10
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return EMPTYSTRING;
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}
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unsigned int PositionalNumeralSystem::GetDigits()
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{
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return digits;
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}
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void PositionalNumeralSystem::SetDigits(unsigned int digits)
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{
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this->digits = digits;
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}
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const char PositionalNumeralSystem::GetFractionPoint()
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{
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return static_cast<const char>(this->fractionPoint);
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}
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void PositionalNumeralSystem::SetFractionPoint(const char fractionPoint)
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{
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this->fractionPoint = fractionPoint;
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}
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const char *PositionalNumeralSystem::GetSpecialCase(Number *number)
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{
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if (number->IsNaN())
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{
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buf->Empty();
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buf->Append("NaN");
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return buf->GetString();
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}
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if (number->IsNotImplemented())
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{
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buf->Empty();
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buf->Append("NotImplemented");
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return buf->GetString();
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}
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if (number->IsInfinite() && number->IsNegative())
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{
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buf->Empty();
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buf->Append("-Inf");
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return buf->GetString();
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}
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if (number->IsInfinite() && !number->IsNegative())
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{
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buf->Empty();
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buf->Append("Inf");
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return buf->GetString();
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}
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if (number->IsZero())
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{
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buf->Empty();
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buf->Append("0");
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return buf->GetString();
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}
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return nullptr;
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}
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const char *PositionalNumeralSystem::GetText(Number *number)
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{
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const char *sc = GetSpecialCase(number);
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if (sc != nullptr)
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{
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return sc;
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}
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if (number->system == nsysreal)
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{
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return GetText(number->GetRealValue());
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}
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complex w = static_cast<ComplexNumber *>(number)->GetComplexValue();
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double a = creal(w);
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double b = cimag(w);
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if (a == 0.0 && b == 0.0)
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{
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buf->Empty();
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buf->Append('0');
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return buf->GetString();
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}
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CharBuffer *val = new CharBuffer(512);
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val->Empty();
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if (a != 0.0)
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{
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const char *real = GetText(a);
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val->Append(real);
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}
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const char *imag = GetText(b);
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if (a != 0.0 && b > 0.0)
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{
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val->Append('+');
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}
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if (b != 0.0)
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{
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val->Append(imag);
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val->Append('i');
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}
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buf->Copy(val);
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delete val;
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return buf->GetString();
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}
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const char *PositionalNumeralSystem::GetText(double number) const
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{
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if (number == 0.0)
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{
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return "0";
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}
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buf->Empty();
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double dnumber = number;
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if (dnumber < 0.0)
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{
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buf->Append('-');
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dnumber = -dnumber;
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}
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double expbor = log2p(base, dnumber);
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double expacc = expbor > 0.0 ? 4e-14 : -1e-15;
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double expborder = trunc(expbor + expacc);
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int exponent = 0;
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double rounding;
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double bordermax = trunc(9.0 * 10 / base);
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double bordermin = trunc(-8.0 * 10 / base);
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// Find exponent
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if (expborder >= bordermax || expborder <= bordermin)
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{
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double dexp = trunc(log2p(base, dnumber) + expacc);
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dnumber = dnumber * pow(base, -dexp);
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// pow is inaccurate on small and large numbers
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if (dexp > 15 || dexp < -15)
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{
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dnumber += 2e-15;
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}
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// Adjust if below zero
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if (dnumber < 1.0)
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{
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dexp--;
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dnumber *= base;
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}
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exponent = static_cast<int>(dexp);
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rounding = 0;
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}
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else
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{
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double acc = exponent > 0 ? 15 : -15;
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rounding = pow(base, exponent + acc);
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}
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int digitout;
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int intdigits;
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double intvalue = trunc(dnumber + rounding);
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IntegerToBuffer(intvalue, digits, &intdigits);
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int fragdigits = digits - intdigits + (intvalue < 1.0 ? 1 : 0);
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if (fragdigits > 0)
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{
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buf->Append(fractionPoint);
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double fraction = fabs(round((dnumber - intvalue) * pow(base, fragdigits)));
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double temp1 = log2p(base, fraction);
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FloatUnion64 temp2;
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temp2.floatingPoint = temp1;
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bool fin = !temp2.IsInf();
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int actualdigits = static_cast<int>(trunc(temp1 + 3e-15));
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int padding = fragdigits - (fin == 1 ? actualdigits : 0) - 1;
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// Pad zeros if needed
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while (padding-- > 0)
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{
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buf->Append('0');
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}
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intvalue = static_cast<int64_t>(trunc(fraction * base) / base);
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IntegerToBuffer(intvalue, fragdigits, &digitout);
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// Remove trailing zeros
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// ReSharper disable once CppPossiblyErroneousEmptyStatements
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while (buf->RemoveTrailing('0'))
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;
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buf->RemoveTrailing(fractionPoint);
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}
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// Add exponent
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if (exponent != 0)
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{
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buf->Append('e');
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buf->Append(exponent > 0 ? '+' : '-');
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IntegerToBuffer(abs(exponent), 3, &digitout);
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}
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// Make sure no rounding error is returned
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if (buf->Is("-0"))
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{
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buf->Empty();
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buf->Append('0');
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}
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return buf->GetString();
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}
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void PositionalNumeralSystem::IntegerToBuffer(double value, unsigned int digits, int *outdigits) const
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{
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static const char *alphaNumerics = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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unsigned int count = 0;
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char *chars = new char[128];
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char *start = chars;
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do
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{
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count++;
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unsigned int intremainder = static_cast<unsigned int>(trunc(fmod(value, base)));
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*chars++ = alphaNumerics[intremainder];
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value /= base;
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} while (value >= 1.0);
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unsigned int n = count;
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unsigned int q = digits;
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chars--;
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while (n-- != 0 && q-- != 0)
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{
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buf->Append(*chars--);
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}
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n++;
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while (n-- != 0)
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{
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buf->Append('0');
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}
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*outdigits = count;
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delete[] start;
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}
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Number *PositionalNumeralSystem::Parse(const char *text, unsigned int *length, char **end)
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{
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unsigned int intbase = static_cast<unsigned int>(base);
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char maxNumeric = (intbase > 10 ? 10 : intbase) + '0' - 1;
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char maxAlpha = intbase > 10 ? intbase + 'A' - 11 : 0;
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unsigned int pos = 0;
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double integer = 0;
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double addition;
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while (*text != '\0' && ((*text >= '0' && *text <= maxNumeric) || (maxAlpha != 0 && *text >= 'A' && *text <= maxAlpha)))
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{
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addition = ((*text >= '0' && *text <= maxNumeric) ? (*text - '0') : (*text - 'A' + 10)) * 1.0;
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integer = integer * base + addition;
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text++;
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pos++;
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}
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// Digits not found
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if (pos == 0)
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{
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*length = 0;
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*end = const_cast<char*>(text);
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return new RealNumber();
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}
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double fraction = 0.0;
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double divisor = 1.0;
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if (*text == fractionPoint && fractionPoint != '\0')
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{
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text++;
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pos++;
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while (*text != '\0' && ((*text >= '0' && *text <= maxNumeric) || (maxAlpha != '\0' && *text >= 'A' && *text <= maxAlpha)))
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{
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addition = ((*text >= '0' && *text <= maxNumeric) ? (*text - '0') : (*text - 'A' + 10));
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fraction = fraction * base + addition;
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divisor *= base;
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text++;
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pos++;
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}
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}
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double exp = 0.0;
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if (*text == 'e' || *text == 'E')
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{
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text++;
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pos++;
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double sign = *text == '+' ? 1.0 : *text == '-' ? -1.0 : 0.0;
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if (sign != 0.0)
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{
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text++;
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pos++;
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while (*text != '\0' && ((*text >= '0' && *text <= maxNumeric) || (maxAlpha != 0 && *text >= 'A' && *text <= maxAlpha)))
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{
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addition = ((*text >= '0' && *text <= maxNumeric) ? (*text - '0') : (*text - 'A' + 10)) * 1.0;
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exp = exp * base + addition;
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text++;
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pos++;
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}
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exp *= sign;
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}
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else
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{
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text--;
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pos--;
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}
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}
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*length = pos;
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*end = const_cast<char*>(text);
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double dnumber = (integer + (fraction / divisor));
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if (exp != 0.0)
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{
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// pow seems a bit off
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dnumber *= pow(base, exp + 4e-15);
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}
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return new RealNumber(dnumber);
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}
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