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       1                 :            : /******************************************************************************
       2                 :            :  * Top contributors (to current version):
       3                 :            :  *   Andrew Reynolds, Tianyi Liang
       4                 :            :  *
       5                 :            :  * This file is part of the cvc5 project.
       6                 :            :  *
       7                 :            :  * Copyright (c) 2009-2024 by the authors listed in the file AUTHORS
       8                 :            :  * in the top-level source directory and their institutional affiliations.
       9                 :            :  * All rights reserved.  See the file COPYING in the top-level source
      10                 :            :  * directory for licensing information.
      11                 :            :  * ****************************************************************************
      12                 :            :  *
      13                 :            :  * Model normal form finder for strings
      14                 :            :  */
      15                 :            : 
      16                 :            : #include "cvc5_private.h"
      17                 :            : 
      18                 :            : #ifndef CVC5__THEORY__STRINGS__MODEL_CONS_H
      19                 :            : #define CVC5__THEORY__STRINGS__MODEL_CONS_H
      20                 :            : 
      21                 :            : #include "smt/env_obj.h"
      22                 :            : 
      23                 :            : namespace cvc5::internal {
      24                 :            : namespace theory {
      25                 :            : namespace strings {
      26                 :            : 
      27                 :            : /**
      28                 :            :  * The base class for strings model construction. This is used by TheoryStrings
      29                 :            :  * during collectModeValues for specifying how to construct model values
      30                 :            :  * for string-like terms.
      31                 :            :  */
      32                 :            : class ModelCons : protected EnvObj
      33                 :            : {
      34                 :            :  public:
      35                 :      49278 :   ModelCons(Env& env) : EnvObj(env) {}
      36                 :      49022 :   virtual ~ModelCons() {}
      37                 :            : 
      38                 :            :   /**
      39                 :            :    * Get string representatives from relevant term set.
      40                 :            :    *
      41                 :            :    * Based on the current set of relevant terms in termSet, this gets all
      42                 :            :    * representatives of string-like type to be used for model construction,
      43                 :            :    * and groups them by type.
      44                 :            :    *
      45                 :            :    * @param termSet The relevant term set
      46                 :            :    * @param repTypes The set of types of terms in the domain of repSet
      47                 :            :    * @param repSet Map from types to the representatives of that type
      48                 :            :    * @param auxEq A list of equalities to assert directly to the model, e.g.
      49                 :            :    * if some term was equated to another.
      50                 :            :    */
      51                 :            :   virtual void getStringRepresentativesFrom(
      52                 :            :       const std::set<Node>& termSet,
      53                 :            :       std::unordered_set<TypeNode>& repTypes,
      54                 :            :       std::map<TypeNode, std::unordered_set<Node>>& repSet,
      55                 :            :       std::vector<Node>& auxEq) = 0;
      56                 :            :   /**
      57                 :            :    * Separate by length.
      58                 :            :    *
      59                 :            :    * Separate the string representatives in argument n into a partition cols
      60                 :            :    * whose collections have equal length. The i^th vector in cols has length
      61                 :            :    * lts[i] for all elements in col.
      62                 :            :    *
      63                 :            :    * Must assign lts to *concrete* lengths.
      64                 :            :    */
      65                 :            :   virtual void separateByLength(const std::vector<Node>& n,
      66                 :            :                                 std::vector<std::vector<Node>>& cols,
      67                 :            :                                 std::vector<Node>& lts) = 0;
      68                 :            :   /**
      69                 :            :    * Get the normal form for n. If the returned vector has length > 1, then the
      70                 :            :    * model value for (all variables in) the equivalence class of n will be
      71                 :            :    * assigned to the model value based on this list. If the returned vector
      72                 :            :    * has length 0, the equivalence class will be assigned the empty string.
      73                 :            :    * If the returned vector has size 1 and contains a constant, the equivalence
      74                 :            :    * class will be assigned that constant. Otherwise, the equivalence class
      75                 :            :    * will be assigned an arbitrary value whose length was determined by
      76                 :            :    * a call to separateByLength.
      77                 :            :    */
      78                 :            :   virtual std::vector<Node> getNormalForm(Node n) = 0;
      79                 :            : };
      80                 :            : 
      81                 :            : }  // namespace strings
      82                 :            : }  // namespace theory
      83                 :            : }  // namespace cvc5::internal
      84                 :            : 
      85                 :            : #endif /* CVC5__THEORY__STRINGS__MODEL_CONS_H */