Examples of kodkod.ast.Decl

kodkod.ast.Decl
A variable declaration, such as 'x : lone X'. Declarations are used with quantified formulas and comprehension expressions. @specfield variable: Variable @specfield expression: Expression @specfield multiplicity: LONE + ONE + SOME + SET @invariant variable.arity = expression.arity @invariant children=0->variable + 1->expression @author Emina Torlak

   * @return { d: Declaration |  d.variable = decl.variable && d.multiplicity = decl.multiplicity &&
   *                             d.expression = decl.expression.accept(this) } 
   */
  @Override
  public final Decl visit(Decl decl) {
    Decl ret = lookup(decl);
    if (ret!=null) return ret;
    final int oldDepth = skolemDepth;
    skolemDepth = -1; // can't skolemize inside a decl
    final Expression expression = decl.expression().accept(this);
    skolemDepth = oldDepth;

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    if (skolemDepth>=0 && (negated && quant==ALL || !negated && quant==SOME)) { // skolemizable formula
      final List<Formula> rangeConstraints = new LinkedList<Formula>();
      final List<Formula> domConstraints = new LinkedList<Formula>();
      
      for(Decl decl : decls) {  
        final Decl skolemDecl = visit(decl);
        
        final Relation skolem = Relation.nary("$"+ skolemDecl.variable().name(), nonSkolems.size() + skolemDecl.variable().arity());
        reporter.skolemizing(decl, skolem, nonSkolemsView);
        
        final Expression skolemExpr = skolemExpr(skolemDecl, skolem);
        
        final Multiplicity mult = decl.multiplicity();
        rangeConstraints.add(source(skolemExpr.in(skolemDecl.expression()), decl));
        if (mult!=Multiplicity.SET) { 
          rangeConstraints.add(source(skolemExpr.apply(mult), decl));
        }


        if (!nonSkolems.isEmpty())

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    if (currentDecl==decls.size()) {
      matrix.set(partialIndex, factory.and(declConstraints, formula.accept(this)));
      return;
    }


    final Decl decl = decls.get(currentDecl);
    final BooleanMatrix declTransl = visit(decl);
    final int position = (int)StrictMath.pow(interpreter.universe().size(), decls.size()-currentDecl-1);
    final BooleanMatrix groundValue = factory.matrix(declTransl.dimensions());
    env = env.extend(decl.variable(), groundValue);
    for(IndexedEntry<BooleanValue> entry : declTransl) {
      groundValue.set(entry.index(), BooleanConstant.TRUE);
      comprehension(decls, formula, currentDecl+1, factory.and(entry.value(), declConstraints), 
          partialIndex + entry.index()*position, matrix);
      groundValue.set(entry.index(), BooleanConstant.FALSE);

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    if (decls.size()==currentDecl) {
      acc.add(factory.or(declConstraints, formula.accept(this)));
      return;
    }


    final Decl decl = decls.get(currentDecl);
    final BooleanMatrix declTransl = visit(decl);
    final BooleanMatrix groundValue = factory.matrix(declTransl.dimensions());
    env = env.extend(decl.variable(), groundValue);
    for(IndexedEntry<BooleanValue> entry : declTransl) {
      groundValue.set(entry.index(), BooleanConstant.TRUE);
      all(decls, formula, currentDecl+1, factory.or(factory.not(entry.value()), declConstraints), acc);
      groundValue.set(entry.index(), BooleanConstant.FALSE);  
    }

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    if (decls.size()==currentDecl) {
      acc.add(factory.and(declConstraints, formula.accept(this)));
      return;
    }


    final Decl decl = decls.get(currentDecl);
    final BooleanMatrix declTransl = visit(decl);
    final BooleanMatrix groundValue = factory.matrix(declTransl.dimensions());
    env = env.extend(decl.variable(), groundValue);
    for(IndexedEntry<BooleanValue> entry : declTransl) {
      groundValue.set(entry.index(), BooleanConstant.TRUE);
      some(decls, formula, currentDecl+1, factory.and(entry.value(), declConstraints), acc);
      groundValue.set(entry.index(), BooleanConstant.FALSE);  
    }

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    if (decls.size()==currentDecl) {
      values.add( expr.accept(this).choice(declConstraints, factory.integer(0)) );
      return;
    }


    final Decl decl = decls.get(currentDecl);
    final BooleanMatrix declTransl = visit(decl);
    final BooleanMatrix groundValue = factory.matrix(declTransl.dimensions());
    env = env.extend(decl.variable(), groundValue);
    for(IndexedEntry<BooleanValue> entry : declTransl) {
      groundValue.set(entry.index(), BooleanConstant.TRUE);
      sum(decls, expr, currentDecl+1, factory.and(entry.value(), declConstraints), values);
      groundValue.set(entry.index(), BooleanConstant.FALSE);  
    }

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   * @return { d: Declaration |  d.variable = declaration.variable.accept(this) && 
   *                             d.multiplicity = decl.multiplicity && 
   *                             d.expression = declaration.expression.accept(this) 
   */
  public Decl visit(Decl decl) {
    Decl ret = lookup(decl);
    if (ret!=null) return ret;
    
    final Variable variable = (Variable) decl.variable().accept(this);
    final Expression expression = decl.expression().accept(this);
    ret = (variable==decl.variable() && expression==decl.expression()) ?

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Related Classes of kodkod.ast.Decl

kodkod.ast.visitor.AbstractReplacer

kodkod.engine.fol2sat.FOL2BoolTranslator

kodkod.engine.fol2sat.Skolemizer

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