ReactionTokens.hpp

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// SPDX-License-Identifier: Apache-2.0
//
// Copyright 2026 Caleb Buahin
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

 
#ifndef OPENSWMM_ENGINE_DATA_REACTION_TOKENS_HPP
#define OPENSWMM_ENGINE_DATA_REACTION_TOKENS_HPP
 
#include <cstdint>
 
namespace openswmm {

enum class RxHydVar : int {
    D = 0,    
    Q,        
    U,        
    RE,       
    US,       
    FF,       
    AV,       
    HRT,      
    DT,       
    TEMP,     
    COUNT_
};

struct RxToken {
    enum Op : uint8_t {
        PUSH_NUM = 0,   
        PUSH_SPECIES,   
        PUSH_COEF,      
        PUSH_TERM,      
        PUSH_HYDVAR,    
        PUSH_POLLUT,    
        ADD, SUB, MUL, DIV, POW, NEG,
        F_EXP, F_LOG, F_LOG10, F_SQRT, F_ABS, F_SGN, F_STEP,
        F_SIN, F_COS, F_TAN,
        F_MIN, F_MAX    
    };
    uint8_t  op    = PUSH_NUM;
    int32_t  idx   = 0;
    double   value = 0.0;
};

struct RxExprSpan {
    int32_t begin = 0;
    int32_t len   = 0;
};

inline constexpr int kRxMaxStackDepth = 32;
 
}  // namespace openswmm
 
#endif  // OPENSWMM_ENGINE_DATA_REACTION_TOKENS_HPP