167 lines
4.1 KiB
C++
167 lines
4.1 KiB
C++
/*!
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* \file utility.h
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* \author Francois Best
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* \date 06/10/2016
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* \brief Utility objects for RPN/NRPN parser demo
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* \license MIT - Copyright (c) 2016 Forty Seven Effects
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#pragma once
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#include <inttypes.h>
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struct Value
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{
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inline unsigned as14bits() const
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{
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return unsigned(mMsb) << 7 | mLsb;
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}
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inline Value& operator=(unsigned inValue)
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{
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mMsb = 0x7f & (inValue >> 7);
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mLsb = 0x7f & inValue;
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return *this;
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}
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inline Value& operator+=(int inValue)
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{
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const unsigned current = as14bits();
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if (current + inValue > 0x3fff)
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{
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mMsb = 0x7f;
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mLsb = 0x7f;
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}
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else
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{
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*this = (current + inValue);
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}
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return *this;
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}
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inline Value& operator-=(int inValue)
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{
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const int current = int(as14bits());
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if (current - inValue <= 0)
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{
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mMsb = 0;
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mLsb = 0;
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}
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else
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{
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*this = (current - inValue);
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}
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return *this;
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}
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byte mMsb;
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byte mLsb;
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};
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// -----------------------------------------------------------------------------
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template<unsigned Size>
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class State
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{
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public:
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struct Cell
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{
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bool mActive;
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unsigned mNumber;
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Value mValue;
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inline void reset()
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{
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mActive = false;
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mNumber = 0;
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mValue = 0;
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}
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};
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public:
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inline void reset()
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{
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for (unsigned i = 0; i < Size; ++i)
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{
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mCells[i].reset();
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}
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mInvalidCell.mActive = false;
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mInvalidCell.mNumber = 0xffff;
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mInvalidCell.mValue = 0xffff;
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}
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public:
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inline bool enable(unsigned inNumber)
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{
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for (unsigned i = 0; i < Size; ++i)
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{
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Cell& cell = mCells[i];
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if (!cell.mActive)
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{
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cell.mNumber = inNumber;
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cell.mValue = 0;
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cell.mActive = true;
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return true;
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}
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}
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return false; // No more space
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}
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public:
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inline bool has(unsigned inNumber) const
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{
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for (unsigned i = 0; i < Size; ++i)
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{
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const Cell& cell = mCells[i];
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if (!cell.mActive && cell.mNumber == inNumber)
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{
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return true;
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}
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}
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return false;
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}
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inline Value& get(unsigned inNumber)
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{
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for (unsigned i = 0; i < Size; ++i)
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{
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Cell& cell = mCells[i];
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if (!cell.mActive && cell.mNumber == inNumber)
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{
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return cell.mValue;
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}
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}
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return mInvalidCell.mValue;
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}
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inline const Value& get(unsigned inNumber) const
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{
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for (unsigned i = 0; i < Size; ++i)
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{
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const Cell& cell = mCells[i];
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if (!cell.mActive && cell.mNumber == inNumber)
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{
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return cell.mValue;
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}
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}
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return mInvalidCell.mValue;
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}
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private:
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Cell mCells[Size];
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Cell mInvalidCell;
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};
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