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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds |
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* |
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* This file is part of the cvc5 project. |
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* |
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* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS |
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* in the top-level source directory and their institutional affiliations. |
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* All rights reserved. See the file COPYING in the top-level source |
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* directory for licensing information. |
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* **************************************************************************** |
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* |
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* Equivalence class info for the theory of strings. |
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*/ |
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#include "cvc5_private.h" |
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#ifndef CVC5__THEORY__STRINGS__EQC_INFO_H |
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#define CVC5__THEORY__STRINGS__EQC_INFO_H |
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#include <map> |
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#include "context/cdo.h" |
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#include "context/context.h" |
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#include "expr/node.h" |
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namespace cvc5 { |
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namespace theory { |
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namespace strings { |
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/** |
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* SAT-context-dependent information about an equivalence class. This |
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* information is updated eagerly as assertions are processed by the theory of |
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* strings at standard effort. |
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*/ |
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class EqcInfo |
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{ |
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public: |
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EqcInfo(context::Context* c); |
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~EqcInfo() {} |
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/** add prefix constant |
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* |
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* This informs this equivalence class info that a term t in its |
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* equivalence class has a constant prefix (if isSuf=true) or suffix |
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* (if isSuf=false). The constant c (if non-null) is the value of that |
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* constant, if it has been computed already. |
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* |
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* If this method returns a non-null node ret, then ret is a conjunction |
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* corresponding to a conflict that holds in the current context. |
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*/ |
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Node addEndpointConst(Node t, Node c, bool isSuf); |
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/** |
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* If non-null, this is a term x from this eq class such that str.len( x ) |
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* occurs as a term in this SAT context. |
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*/ |
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context::CDO<Node> d_lengthTerm; |
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/** |
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* If non-null, this is a term x from this eq class such that str.code( x ) |
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* occurs as a term in this SAT context. |
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*/ |
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context::CDO<Node> d_codeTerm; |
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context::CDO<unsigned> d_cardinalityLemK; |
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context::CDO<Node> d_normalizedLength; |
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/** |
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* A node that explains the longest constant prefix known of this |
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* equivalence class. This can either be: |
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* (1) A term from this equivalence class, including a constant "ABC" or |
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* concatenation term (str.++ "ABC" ...), or |
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* (2) A membership of the form (str.in.re x R) where x is in this |
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* equivalence class and R is a regular expression of the form |
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* (str.to.re "ABC") or (re.++ (str.to.re "ABC") ...). |
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*/ |
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context::CDO<Node> d_prefixC; |
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/** same as above, for suffix. */ |
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context::CDO<Node> d_suffixC; |
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}; |
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} // namespace strings |
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} // namespace theory |
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} // namespace cvc5 |
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#endif /* CVC5__THEORY__STRINGS__EQC_INFO_H */ |