#pragma warning disable 1573
/// <inheritdoc cref="SwiPrologQuery(string)" />
/// <summary>locating the predicate in the named module.</summary>
/// <param name="module">locating the predicate in the named module.</param>
public SwiPrologQuery(string module, string goal)
{
if (string.IsNullOrEmpty(goal))
{
throw new ArgumentNullException("goal");
}
if (string.IsNullOrEmpty(module))
{
_module = ModuleDefault;
}
else
{
_module = module;
}
var queryString = goal;
try
{
// call read_term(Term_of_query_string, [variable_names(VN)]).
// read_term_from_atom('noun(ş,C)', T, [variable_names(Vars)]).
// befor 2014 with redirected IO-Streams (PlQuery_Old_Kill_unused)
var atom = new SwiPrologTerm("'" + goal.Replace(@"\", @"\\").Replace("'", @"\'") + "'");
SwiPrologTerm term = SwiPrologTerm.Variable();
SwiPrologTerm options = SwiPrologTerm.Variable();
SwiPrologTerm variablenames = SwiPrologTerm.Variable();
SwiPrologTerm l = SwiPrologTerm.Tail(options);
l.Append(SwiPrologTerm.Compound("variable_names", variablenames));
l.Close();
var args = new SwiPrologTermVector(atom, term, options);
if (!Call(_module, "read_term_from_atom", args))
{
throw new SwiPrologLibraryException("Call read_term_from_atom/3 fails! goal:" + queryString);
}
// set list of variables and variable_names into _queryVariables
foreach (SwiPrologTerm t in variablenames.ToList())
{
// t[0]='=' , t[1]='VN', t[2]=_G123
_queryVariables.Add(new SwiPrologQueryVariable(t[1].ToString(), t[2]));
}
// Build the query
_name = term.Name;
// is ok e.g. for listing/0.
// Check.Require(term.Arity > 0, "PlQuery(PlTerm t): t.Arity must be greater than 0.");
_av = new SwiPrologTermVector(term.Arity);
for (int index = 0; index < term.Arity; index++)
{
if (0 == libswipl.PL_get_arg(index + 1, term.TermRef, _av[index].TermRef))
{
throw new SwiPrologException("PL_get_arg in PlQuery " + term.ToString());
}
}
}
#if _DEBUG
catch (Exception ex)
{
System.Diagnostics.Debug.Print(ex.Message);
Console.WriteLine(ex.Message);
}
#endif
finally
{
// NBT
}
}