muParserState.hpp

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/*****************************************************************************
    NumeRe: Framework fuer Numerische Rechnungen
    Copyright (C) 2022  Erik Haenel et al.
 
    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 3 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.  If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/
 
 
#ifndef MUPARSERSTATE_HPP
#define MUPARSERSTATE_HPP
 
#include <vector>
#include <string>
#include <utility>
#include "muParserDef.h"
#include "muParserBytecode.h"
 
class StringView;
 
namespace mu
{
    struct CachedDataAccess
    {
        enum
        {
            NO_FLAG = 0x0,
            IS_CLUSTER = 0x1,
            IS_TABLE_METHOD = 0x2
        };
 
        std::string sAccessEquation; // Passed to parser_getIndices -> returns the indices for the current access
        std::string sVectorName; // target of the created vector -> use SetVectorVar
        std::string sCacheName; // needed for reading the data -> create a vector var
        int flags;
    };
 
 
    struct VectorEvaluation
    {
        enum EvalType
        {
            EVALTYPE_NONE,
            EVALTYPE_MULTIARGFUNC,
            EVALTYPE_VECTOR,
            EVALTYPE_VECTOR_EXPANSION
        };
 
        EvalType m_type;
        std::string m_mafunc;
        std::string m_targetVect;
        std::vector<int> m_componentDefs;
 
        void create(const std::string& sTargetVect)
        {
            m_type = EVALTYPE_VECTOR;
            m_targetVect = sTargetVect;
        }
 
        void create(const std::string& sTargetVect, const std::string& sMaFunc)
        {
            m_type = EVALTYPE_MULTIARGFUNC;
            m_targetVect = sTargetVect;
            m_mafunc = sMaFunc;
        }
 
        void create(const std::string& sTargetVect, const std::vector<int>& vCompDefs)
        {
            m_type = EVALTYPE_VECTOR_EXPANSION;
            m_targetVect = sTargetVect;
            m_componentDefs = vCompDefs;
        }
 
        void clear()
        {
            m_type = EVALTYPE_NONE;
            m_mafunc.clear();
            m_targetVect.clear();
            m_componentDefs.clear();
        }
    };
 
 
    struct State
    {
        ParserByteCode m_byteCode;
        std::string m_expr;
        int m_valid;
        int m_numResults;
        valbuf_type m_stackBuffer;
        varmap_type m_usedVar;
        VectorEvaluation m_vectEval;
 
        State() : m_valid(1), m_numResults(0) {}
 
        void clear()
        {
            m_byteCode.clear();
            m_expr.clear();
            m_valid = 1;
            m_numResults = 0;
            m_stackBuffer.clear();
            m_usedVar.clear();
            m_vectEval.clear();
        }
    };
 
 
    struct Cache
    {
        std::vector<CachedDataAccess> m_accesses;
        std::string m_expr;
        std::string m_target;
        bool m_enabled;
 
        void clear()
        {
            m_accesses.clear();
            m_expr.clear();
            m_target.clear();
            m_enabled = true;
        }
 
        Cache() : m_enabled(true) {}
    };
 
 
    struct ExpressionTarget
    {
        std::vector<mu::value_type*> m_targets;
 
        void create(StringView sTargets, const varmap_type& usedVars);
        void assign(const valbuf_type& buffer, int nResults);
 
        void clear()
        {
            m_targets.clear();
        }
 
        bool isValid() const
        {
            return m_targets.size();
        }
    };
 
 
    struct LineStateStack
    {
        std::vector<State> m_states;
        Cache m_cache;
        ExpressionTarget m_target;
 
        LineStateStack() : m_states(std::vector<State>(1)) {}
 
        void clear()
        {
            m_states.clear();
            m_cache.clear();
            m_target.clear();
        }
    };
 
 
    struct StateStacks
    {
        std::vector<LineStateStack> m_stacks;
 
        State& operator()(size_t i, size_t j)
        {
            if (i < m_stacks.size() && j < m_stacks[i].m_states.size())
                return m_stacks[i].m_states[j];
 
            return m_stacks.back().m_states.back();
        }
 
        LineStateStack& operator[](size_t i)
        {
            if (i < m_stacks.size())
                return m_stacks[i];
 
            return m_stacks.back();
        }
 
        void resize(size_t s)
        {
            m_stacks.resize(s);
        }
 
        void clear()
        {
            m_stacks.clear();
        }
 
        size_t size() const
        {
            return m_stacks.size();
        }
    };
}
 
#endif // MUPARSERSTATE_HPP