function main($argc, $argv)
{
if ($argc < 2 || $argc > 3) {
usage($argv[0]);
}
// Als '-v' is meegegeven tijdens het starten, ga in verbose mode
if ($argv[1] == '-v') {
verbose(true);
$argc--;
array_shift($argv);
} else {
verbose(false);
}
// Reader voor de XML-bestanden
$reader = new KnowledgeBaseReader();
// Parse een xml-bestand (het eerste argument) tot knowledge base
$state = $reader->parse($argv[1]);
// Start de solver, dat ding dat kan infereren
$solver = new Solver();
// leid alle goals in de knowledge base af.
$goals = $state->goals;
// Begin met de doelen die we hebben op de goal stack te zetten
foreach ($goals as $goal) {
$state->goalStack->push($goal->name);
}
// Zo lang we nog vragen kunnen stellen, stel ze
while (($question = $solver->solveAll($state)) instanceof AskedQuestion) {
$answer = cli_ask($question);
if ($answer instanceof Option) {
$state->apply($answer->consequences, Yes::because("User answered '{$answer->description}' to '{$question->description}'"));
}
}
// Geen vragen meer, print de gevonden oplossingen.
foreach ($goals as $goal) {
printf("%s: %s\n", $goal->description, $goal->answer($state)->description);
}
}
public function evaluate(KnowledgeState $state)
{
$state_value = $state->value($this->name);
if ($state_value instanceof Maybe) {
return $state_value;
}
return $state_value == $this->value ? Yes::because([$this->name]) : No::because([$this->name]);
}