public function matchSymbol(Symbol $symbol)
{
$matches = $this->predicate->matchSymbol($symbol);
if ($matches) {
$this->matchCount++;
}
return $matches;
}
/**
* @param SymbolSet $otherSet
* @param SymbolPredicate $acceptPredicate
* @return bool
*/
public function addSome(SymbolSet $otherSet, SymbolPredicate $acceptPredicate)
{
$newSymbolsAdded = false;
foreach ($otherSet as $otherSymbol) {
if ($acceptPredicate->matchSymbol($otherSymbol)) {
$newSymbolsAdded |= $this->add($otherSymbol);
}
}
return $newSymbolsAdded;
}
/**
* @param Expression $lastVisited
* @return boolean
*/
public function continueWalkingAfterVisit(Expression $lastVisited)
{
if ($this->countLeft == 0) {
return false;
}
$found = $this->predicateAdapter->matchExpression($lastVisited);
if ($found) {
$this->countLeft--;
}
return $this->countLeft == 0 ? false : true;
}
/**
* @param Expression $lastVisited
* @return boolean
*/
public function continueWalkingAfterVisit(Expression $lastVisited)
{
if (!is_null($this->foundExpression)) {
return false;
}
$found = $this->predicateAdapter->matchExpression($lastVisited);
if ($found) {
$this->foundExpression = $lastVisited;
}
return !$found;
}
/**
* @param Symbol $nonTerminal
* @param SymbolPredicate $acceptPredicate
* @return ArraySet
*/
public function filterTerminalSet(Symbol $nonTerminal, SymbolPredicate $acceptPredicate)
{
$terminalSetIterator = $this->getTerminalSetIterator($nonTerminal);
$filtered = new ArraySet();
while ($terminalSetIterator->valid()) {
$terminal = $terminalSetIterator->current();
$terminalSetIterator->next();
if ($acceptPredicate->matchSymbol($terminal)) {
$filtered->add($terminal);
}
}
return $filtered;
}
/**
* @param Symbol $symbol
* @return bool
*/
protected function collectSymbol(Symbol $symbol)
{
if ($this->symbolPredicate->matchSymbol($symbol)) {
$this->collectedSymbols[] = $symbol;
return true;
}
return false;
}
/**
* @param \Helstern\Nomsky\Grammar\Symbol\Predicate\SymbolPredicate $predicate
*
* @return Symbol|null
*/
public function findFirst(SymbolPredicate $predicate)
{
$found = null;
foreach ($this->rhs as $symbol) {
if ($predicate->matchSymbol($symbol)) {
$found = $symbol;
}
}
return $found;
}
/**
* @param Symbol $symbol
* @return mixed
*/
public function matchSymbol(Symbol $symbol)
{
return $this->symbolPredicate->matchSymbol($symbol);
}