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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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* Implementation of term context utilities. |
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*/ |
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#include "expr/term_context.h" |
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#include "theory/theory.h" |
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namespace cvc5 { |
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uint32_t TermContext::computeValueOp(TNode t, uint32_t tval) const |
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{ |
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// default is no change |
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return tval; |
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} |
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uint32_t RtfTermContext::initialValue() const |
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{ |
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// by default, not in a term context or a quantifier |
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return 0; |
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} |
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uint32_t RtfTermContext::computeValue(TNode t, |
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uint32_t tval, |
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size_t child) const |
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{ |
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if (t.isClosure()) |
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{ |
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if (tval % 2 == 0) |
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{ |
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return tval + 1; |
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} |
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} |
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else if (hasNestedTermChildren(t)) |
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{ |
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if (tval < 2) |
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{ |
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return tval + 2; |
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} |
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} |
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return tval; |
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} |
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uint32_t RtfTermContext::getValue(bool inQuant, bool inTerm) |
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{ |
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return (inQuant ? 1 : 0) + 2 * (inTerm ? 1 : 0); |
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} |
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void RtfTermContext::getFlags(uint32_t val, bool& inQuant, bool& inTerm) |
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{ |
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inQuant = val % 2 == 1; |
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inTerm = val >= 2; |
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} |
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bool RtfTermContext::hasNestedTermChildren(TNode t) |
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{ |
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Kind k = t.getKind(); |
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// dont' worry about FORALL or EXISTS, these are part of inQuant. |
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return theory::kindToTheoryId(k) != theory::THEORY_BOOL && k != kind::EQUAL |
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&& k != kind::SEP_STAR && k != kind::SEP_WAND && k != kind::SEP_LABEL |
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&& k != kind::BITVECTOR_EAGER_ATOM; |
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} |
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uint32_t InQuantTermContext::initialValue() const { return 0; } |
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uint32_t InQuantTermContext::computeValue(TNode t, |
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uint32_t tval, |
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size_t index) const |
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{ |
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return t.isClosure() ? 1 : tval; |
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} |
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uint32_t InQuantTermContext::getValue(bool inQuant) { return inQuant ? 1 : 0; } |
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bool InQuantTermContext::inQuant(uint32_t val, bool& inQuant) |
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{ |
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return val == 1; |
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} |
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uint32_t PolarityTermContext::initialValue() const |
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{ |
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// by default, we have true polarity |
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return 2; |
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} |
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uint32_t PolarityTermContext::computeValue(TNode t, |
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uint32_t tval, |
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size_t index) const |
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{ |
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switch (t.getKind()) |
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{ |
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case kind::AND: |
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case kind::OR: |
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case kind::SEP_STAR: |
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// polarity preserved |
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return tval; |
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case kind::IMPLIES: |
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// first child reverses, otherwise we preserve |
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return index == 0 ? (tval == 0 ? 0 : (3 - tval)) : tval; |
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case kind::NOT: |
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// polarity reversed |
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return tval == 0 ? 0 : (3 - tval); |
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case kind::ITE: |
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// head has no polarity, branches preserve |
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return index == 0 ? 0 : tval; |
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case kind::FORALL: |
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// body preserves, others have no polarity. |
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return index == 1 ? tval : 0; |
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default: |
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// no polarity |
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break; |
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} |
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return 0; |
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} |
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uint32_t PolarityTermContext::getValue(bool hasPol, bool pol) |
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{ |
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return hasPol ? (pol ? 2 : 1) : 0; |
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} |
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void PolarityTermContext::getFlags(uint32_t val, bool& hasPol, bool& pol) |
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{ |
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hasPol = val == 0; |
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pol = val == 2; |
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} |
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uint32_t TheoryLeafTermContext::initialValue() const { return 0; } |
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uint32_t TheoryLeafTermContext::computeValue(TNode t, |
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uint32_t tval, |
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size_t index) const |
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{ |
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return theory::Theory::isLeafOf(t, d_theoryId) ? 1 : tval; |
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} |
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} // namespace cvc5 |