C++ (Cpp) TNode::substitute Examples

Example #1

File: ite_simplifier.cpp Project: audemard/CVC4

Node ITESimplifier::simpConstants(TNode simpContext, TNode iteNode, TNode simpVar)
{
  NodePairMap::iterator it;
  it = d_simpConstCache.find(pair<Node, Node>(simpContext,iteNode));
  if (it != d_simpConstCache.end()) {
    return (*it).second;
  }

  if (iteNode.getKind() == kind::ITE) {
    NodeBuilder<> builder(kind::ITE);
    builder << iteNode[0];
    unsigned i = 1;
    for (; i < iteNode.getNumChildren(); ++ i) {
      Node n = simpConstants(simpContext, iteNode[i], simpVar);
      if (n.isNull()) {
        return n;
      }
      builder << n;
    }
    // Mark the substitution and continue
    Node result = builder;
    result = Rewriter::rewrite(result);
    d_simpConstCache[pair<Node, Node>(simpContext, iteNode)] = result;
    return result;
  }

  if (!containsTermITE(iteNode)) {
    Node n = Rewriter::rewrite(simpContext.substitute(simpVar, iteNode));
    d_simpConstCache[pair<Node, Node>(simpContext, iteNode)] = n;
    return n;
  }

  Node iteNode2;
  Node simpVar2;
  d_simpContextCache.clear();
  Node simpContext2 = createSimpContext(iteNode, iteNode2, simpVar2);
  if (!simpContext2.isNull()) {
    Assert(!iteNode2.isNull());
    simpContext2 = simpContext.substitute(simpVar, simpContext2);
    Node n = simpConstants(simpContext2, iteNode2, simpVar2);
    if (n.isNull()) {
      return n;
    }
    d_simpConstCache[pair<Node, Node>(simpContext, iteNode)] = n;
    return n;
  }
  return Node();
}