public static int standardizeApart(Chain c, int saIdx) {
List<Variable> variables = new List<Variable>();
foreach (Literal l in c.getLiterals()) {
collectAllVariables(l.getAtomicSentence(), variables);
}
return standardizeApart(variables, c, saIdx);
}
public List<Variable> collectAllVariables(Chain aChain)
{
List<Variable> variables = new List<Variable>();
foreach (Literal l in aChain.getLiterals())
{
l.getAtomicSentence().accept(this, variables);
}
return variables;
}
public Chain standardizeApart(Chain chain,
StandardizeApartIndexical standardizeApartIndexical)
{
List<Variable> toRename = variableCollector.collectAllVariables(chain);
Dictionary<Variable, Term> renameSubstitution = new Dictionary<Variable, Term>();
foreach (Variable var in toRename)
{
Variable v = null;
do
{
v = new Variable(standardizeApartIndexical.getPrefix()
+ standardizeApartIndexical.getNextIndex());
// Ensure the new variable name is not already
// accidentally used in the sentence
} while (toRename.Contains(v));
renameSubstitution.Add(var, v);
}
if (renameSubstitution.Count > 0)
{
List<Literal> lits = new List<Literal>();
foreach (Literal l in chain.getLiterals())
{
AtomicSentence atom = (AtomicSentence)substVisitor.subst(
renameSubstitution, l.getAtomicSentence());
lits.Add(l.newInstance(atom));
}
Chain renamed = new Chain(lits);
renamed.setProofStep(new ProofStepRenaming(renamed, chain
.getProofStep()));
return renamed;
}
return chain;
}
