/**
* Translate array sequence of tokens from infix to
* Reverse Polish notation (RPN) which representing mathematical expression.
*
* @param array $tokens Collection of Token intances
* @return array Collection of Token intances
* @throws InvalidArgumentException
*/
public function translate(array $tokens)
{
$this->operatorStack = new SplStack();
$this->outputQueue = new SplQueue();
for ($i = 0; $i < count($tokens); $i++) {
$token = $tokens[$i];
switch ($token->getType()) {
case Token::T_OPERAND:
$this->outputQueue->enqueue($token);
break;
case Token::T_OPERATOR:
case Token::T_FUNCTION:
$o1 = $token;
$isUnary = $this->isPreviousTokenOperator($tokens, $i) || $this->isPreviousTokenLeftParenthesis($tokens, $i) || $this->hasPreviousToken($i) === false;
if ($isUnary) {
if ($o1->getValue() === '-' || $o1->getValue() === '+') {
$o1 = new Operator($o1->getValue() . 'u', 3, Operator::O_NONE_ASSOCIATIVE);
} else {
if (!$o1 instanceof FunctionToken) {
throw new \InvalidArgumentException("Syntax error: operator '" . $o1->getValue() . "' cannot be used as a unary operator or with an operator as an operand.");
}
}
} else {
while ($this->hasOperatorInStack() && ($o2 = $this->operatorStack->top()) && $o1->hasLowerPriority($o2)) {
$this->outputQueue->enqueue($this->operatorStack->pop());
}
}
$this->operatorStack->push($o1);
break;
case Token::T_LEFT_BRACKET:
$this->operatorStack->push($token);
break;
case Token::T_RIGHT_BRACKET:
if ($this->isPreviousTokenOperator($tokens, $i)) {
throw new \InvalidArgumentException('Syntax error: an operator cannot be followed by a right parenthesis.');
} elseif ($this->isPreviousTokenLeftParenthesis($tokens, $i)) {
throw new \InvalidArgumentException('Syntax error: empty parenthesis.');
}
while (!$this->operatorStack->isEmpty() && Token::T_LEFT_BRACKET != $this->operatorStack->top()->getType()) {
$this->outputQueue->enqueue($this->operatorStack->pop());
}
if ($this->operatorStack->isEmpty()) {
throw new \InvalidArgumentException('Syntax error: mismatched parentheses.');
}
$this->operatorStack->pop();
break;
default:
throw new \InvalidArgumentException(sprintf('Invalid token detected: %s.', $token));
break;
}
}
while ($this->hasOperatorInStack()) {
$this->outputQueue->enqueue($this->operatorStack->pop());
}
if (!$this->operatorStack->isEmpty()) {
throw new InvalidArgumentException('Syntax error: mismatched parentheses or misplaced number.');
}
return iterator_to_array($this->outputQueue);
}
/**
* @inheritdoc
*/
public function pushHandler(HandlerInterface ...$handlers)
{
$this->initHandlers();
foreach ($handlers as $handler) {
$this->handlers->push($handler);
}
}
/**
* Evaluate array sequence of tokens in Reverse Polish notation (RPN)
* representing mathematical expression.
*
* @param array $expressionTokens
* @return float
* @throws \InvalidArgumentException
*/
private function evaluateRPN(array $expressionTokens)
{
$stack = new \SplStack();
foreach ($expressionTokens as $token) {
$tokenValue = $token->getValue();
if (is_numeric($tokenValue)) {
$stack->push((double) $tokenValue);
continue;
}
switch ($tokenValue) {
case '+':
$stack->push($stack->pop() + $stack->pop());
break;
case '-':
$n = $stack->pop();
$stack->push($stack->pop() - $n);
break;
case '*':
$stack->push($stack->pop() * $stack->pop());
break;
case '/':
$n = $stack->pop();
$stack->push($stack->pop() / $n);
break;
case '%':
$n = $stack->pop();
$stack->push($stack->pop() % $n);
break;
default:
throw new \InvalidArgumentException(sprintf('Invalid operator detected: %s', $tokenValue));
break;
}
}
return $stack->top();
}
/**
* @inheritdoc
*/
public function pushProcessor(ProcessorInterface ...$processors)
{
$this->initProcessors();
foreach ($processors as $processor) {
$this->processors->push($processor);
}
}
public function startOrGroup()
{
$predicate = new OrPredicate(new NullPredicate());
$this->predicateStack->top()->pushPredicate($predicate);
$this->predicateStack->push($predicate);
return $this;
}
/**
* 加载指定目录下的配置并生成[绝对路径=>配置]
* (备用）
*
* @param $filePath
* @param string $ext
*/
private function LoadV2($filePath, $ext = '.php')
{
$resConfig = [];
$split = '.';
if (file_exists($filePath)) {
$key = basename($filePath, $ext);
$configs = (include $filePath);
$keyStack = new \SplStack();
$keyStack->push([$key, $configs]);
$whileCount = 0;
//防止意外进入死循环，限制最多循环1024层
while (!$keyStack->isEmpty() && $whileCount < 1024) {
$whileCount++;
$pair = $keyStack->pop();
foreach ($pair[1] as $pairKey => $pairVal) {
if (is_array($pairVal)) {
$keyStack->push([$pair[0] . $split . $pairKey, $pairVal]);
} else {
$resConfig[$pair[0] . $split . $pairKey] = $pairVal;
}
}
}
}
return $resConfig;
}
public function parse($data)
{
$tokens = $this->tokenizer($data);
$this->stack = new \SplStack();
$this->stack->push(0);
while (true) {
$token = $tokens[0];
$state = $this->stack->top();
$terminal = $token[0];
if (!isset($this->action[$state][$terminal])) {
throw new \Exception('Token not allowed here (' . $token[1] . ')');
}
$action = $this->action[$state][$terminal];
if ($action[0] === 0) {
$this->stack->push($token[1]);
$this->stack->push($action[1]);
array_shift($tokens);
} elseif ($action[0] === 1) {
$value = $this->reduce($action[2], $action[1]);
array_unshift($tokens, array($action[3], $value));
} elseif ($action[0] === 2) {
$this->stack->pop();
return $this->stack->pop();
} else {
throw new \RuntimeException('Cannot compile');
}
}
throw new \RuntimeException('Cannot compile. EOF');
}
/**
* {@inheritdoc}
*/
protected function onElementStart($parser, $name, $attributes)
{
$this->stack->push($name);
if ($name === 'ITEM') {
$this->currentRate = array();
}
}
function testPrintTraversable()
{
$stack = new \SplStack();
$stack->push('foo');
$stack->push('bar');
$this->assertEquals("<SplStack>['bar', 'foo']", ValuePrinter::serialize($stack));
}
public function registerCssFile($filename)
{
if (!isset($this->css_files)) {
$this->css_files = new SplStack();
}
$this->css_files->push($filename);
}
public function calculate(array $variables)
{
$stack = new \SplStack();
foreach ($this->reversePolandNotation as $token) {
if ($token->getExpressionType() == ExpressionElementInterface::CONSTANT) {
/** @var $token Constant */
$stack->push($token->getValue());
}
if ($token->getExpressionType() == ExpressionElementInterface::VARIABLE) {
/** @var $token Variable*/
$variableName = $token->getValue();
if (isset($variables[$variableName])) {
$stack->push($variables[$variableName]);
} else {
throw new ExpressionParserException("Undefined variable: " . $variableName);
}
}
if ($token->getExpressionType() == ExpressionElementInterface::OPERATOR) {
/** @var $token OperatorInterface */
$arg1 = $stack->pop();
$arg2 = $stack->pop();
$stack->push($token->calculate($arg1, $arg2));
}
}
return $stack->top();
}
public function startVisiting($object)
{
if (!is_object($object)) {
return;
}
$this->visitingSet->attach($object);
$this->visitingStack->push($object);
}
/**
* start profiling a block of code
*
* @param string $title the name you are giving to this block of profiled code
* @return boolean pretty much always returns true
*/
public function start($title)
{
$profile_map = array();
$profile_map['start'] = microtime(true);
$profile_map['title'] = $title;
$this->stack_started->push($profile_map);
return true;
}
/**
* {@inheritdoc}
*/
public function withMiddleware($middleware) : StackContract
{
if ($middleware instanceof MiddlewareInterface || $middleware instanceof ServerMiddlewareInterface) {
$this->stack->push($this->isContainerAware($middleware));
return $this;
}
throw new LogicException('Unsupported middleware type.');
}
/**
* {@inheritdoc}
*/
public function enterNode(Node $node)
{
if ($node instanceof Node\FunctionLike) {
$this->loopStacks->push(new \SplStack());
} elseif ($this->isTargetLoopNode($node)) {
$this->getCurrentLoopStack()->push($node);
}
}
/**
* @return self
*
* @throws \InvalidArgumentException Missing argument(s) when calling push
*/
public function push()
{
if (func_num_args() === 0) {
throw new \InvalidArgumentException("Missing argument(s) when calling push");
}
$spec = func_get_args();
$this->specs->push($spec);
return $this;
}
/**
* @return $this
*/
public function push()
{
if (func_num_args() === 0) {
throw new \InvalidArgumentException('Missing argument(s) when calling push');
}
$msgApp = func_get_args();
$this->components->push($msgApp);
return $this;
}
function postorder($tree)
{
$lst = array();
if (!$tree) {
return $lst;
}
$stack = new SplStack();
$stack->push($tree);
$stack->rewind();
$prev = null;
while ($stack->valid()) {
$curr = $stack->current();
// go down the tree.
//check if current node is leaf, if so, process it and pop stack,
//otherwise, keep going down
if (!$prev || @$prev->left->key == @$curr->key || @$prev->right->key == @$curr->key) {
//prev == null is the situation for the root node
if ($curr->left) {
$stack->push($curr->left);
$stack->rewind();
} else {
if ($curr->right) {
$stack->push($curr->right);
$stack->rewind();
} else {
$stack->pop();
$stack->rewind();
$lst[] = $curr->key;
}
}
//go up the tree from left node
//need to check if there is a right child
//if yes, push it to stack
//otherwise, process parent and pop stack
} else {
if (@$curr->left->key == @$prev->key) {
if (@$curr->right->key) {
$stack->push($curr->right);
$stack->rewind();
} else {
$stack->pop();
$stack->rewind();
$lst[] = $curr->key;
}
} else {
if (@$curr->right->key == @$prev->key) {
$stack->pop();
$stack->rewind();
$lst[] = $curr->key;
}
}
}
$prev = $curr;
}
return $lst;
}
public function getParamsStack()
{
if (null === $this->paramsStack) {
$this->paramsStack = new \SplStack();
if ($this->getParentCommand() instanceof CommandInterface) {
$this->paramsStack->push($this->getParentCommand()->getParams());
}
}
return $this->paramsStack;
}
public function testForValidValues()
{
$var = new \SplStack();
$var->push(1);
$var->push(2);
$var->push(3);
$data = new VariableWrapper(get_class($var), $var);
$result = $this->inspector->get($data);
$this->assertInstanceOf('Ladybug\\Plugin\\Extra\\Type\\CollectionType', $result);
$this->assertCount(3, $result);
}
public function enterNode(Node $node)
{
if ($node instanceof Node\Stmt\Foreach_) {
$this->checkNestedByReferenceForeach($node);
$this->foreachStack->push($node);
} elseif (!$this->foreachStack->isEmpty()) {
$this->checkInternalArrayPointerAccessInByValueForeach($node);
$this->checkArrayModificationByFunctionInByReferenceForeach($node);
$this->checkAddingToArrayInByReferenceForeach($node);
}
}
public function getPathTo($endVertex)
{
if (!$this->hasPathTo($endVertex)) {
return null;
}
$path = new \SplStack();
for ($i = $endVertex; $i != $this->startVertex; $i = $this->edgeTo[$i]) {
$path->push($i);
}
$path->push($this->startVertex);
return $path;
}
public function enterNode(Node $node)
{
if ($node instanceof Node\Expr\Yield_) {
$startTokenPosition = $node->getAttribute('startTokenPos');
$endTokenPosition = $node->getAttribute('endTokenPos');
if (!($this->tokenCollection->isTokenPrecededBy($startTokenPosition, '(') && $this->tokenCollection->isTokenFollowedBy($endTokenPosition, ')')) && !$this->expressionStack->isEmpty()) {
$this->addContextMessage('"yield" usage in expression context', $this->expressionStack->top());
}
} elseif ($node instanceof Node\Expr) {
$this->expressionStack->push($node);
}
}
/**
* Поиск самого дешёвого пути между двумя локациями
* Для поиска используется алгоритм Дейкстры
*
* @see http://www.sitepoint.com/data-structures-4/
*
* @param array $data Массив с локациями и ценой проезда между ними [][src, dst, cost]
* @param string $source Название исходного пункта
* @param string $target Название конечного пункта
*
* @return SplStack
*/
function find_path(array $data, $source, $target)
{
$graph = build_graph($data);
// массив лучших цен кратчайшего пути для каждой локации
$best_cost = [];
// массив предыдущих локаций для каждой локации
$prev_loc = array();
// очередь из необработанных локаций
$queue = new SplPriorityQueue();
foreach ($graph as $src => $dst) {
$best_cost[$src] = INF;
// изначальные значения цен бесконечны
$prev_loc[$src] = null;
// предыдущие локации неизвестны
foreach ($dst as $name => $cost) {
// используем цену как приоритет в очереди
$queue->insert($name, $cost);
}
}
// цена поездки в исходный пункт = 0
$best_cost[$source] = 0;
while (!$queue->isEmpty()) {
// получаем минимальную цену
$u = $queue->extract();
if (empty($graph[$u])) {
continue;
}
// обрабатываем доступные маршруты для локации
foreach ($graph[$u] as $v => $cost) {
// альтернативная цена для маршрута
$alt = $best_cost[$u] + $cost;
if ($alt < $best_cost[$v]) {
// обновляем минимальную цену для локации
$best_cost[$v] = $alt;
// добавляем локацию в массив предыдущих локаций
$prev_loc[$v] = $u;
}
}
}
// ищем дешёвый путь и складываем его в стек
$stack = new SplStack();
$u = $target;
$final_cost = 0;
// проходим в обратном порядке от пункта назначения к исходному пункту
while (isset($prev_loc[$u]) && $prev_loc[$u]) {
$stack->push($u);
$final_cost += $graph[$u][$prev_loc[$u]];
$u = $prev_loc[$u];
}
$stack->push($source);
return [$stack, $final_cost];
}
/**
* Open given block if it is valid.
*
* @param string $name
* @param array $args
*/
public function open($name, array $args = [])
{
if (!is_string($name)) {
throw new InvalidArgumentException('Foil block name must be in a string.');
}
if (!array_key_exists($name, $this->blocks)) {
throw new InvalidArgumentException("{$name} is not a registered Foil block.");
}
/** @var \Foil\Blocks\Block $buffer */
$buffer = $this->blocks[$name];
$buffer->open($args);
$this->buffers->push([$buffer, $name]);
}
/**
* get the current element
*
* this will push the current iterator on the stack if an array is found
*
* @return mixed
*/
public function current()
{
$current = $this->iterator->current();
if (is_array($current)) {
$this->keys[] = $this->key();
// move the iterator to the next element so it will be ready when it pops...
$this->iterator->next();
$this->stack->push($this->iterator);
$this->iterator = new ArrayIterator($current);
$current = $this->current();
}
//if
return $current;
}
/**
* @param null $class
* @return void
*/
public function disable($class = null)
{
if ($class !== null) {
$this->classStack->push($class);
}
if ($this->entityManager->getFilters()->isEnabled('softdeleteable')) {
if ($class !== null) {
/** @var SoftDeleteableFilter $filter */
$filter = $this->entityManager->getFilters()->getFilter('softdeleteable');
$filter->disableForEntity($class);
} else {
$this->entityManager->getFilters()->disable('softdeleteable');
}
}
}
/**
* Pushes the specified form into the stack.
*
* @internal
* @static
* @param Opf_Form $form The form pushed to the stack.
*/
public static function pushToStack(Opf_Form $form)
{
if (self::$_stack === null) {
self::$_stack = new SplStack();
}
self::$_stack->push($form);
}
/**
* Run the pathfinder algorithm
*
* @return \SplStack
*/
public function run()
{
$start = $this->start;
$goal = $this->goal;
$open = new Set([$start], function (NodeInterface $node) use($goal) {
return $this->getHeuristic($goal, $node);
});
$closed = new Set();
$open->add($start);
$path = new \SplStack();
$step = null;
while (!$open->isEmpty()) {
$current = $open->current();
$path->push($current->getNode());
$step = new Step($current->getNode(), $step);
if ($current->getNode() == $goal) {
break;
}
$closed->add($current->getNode());
$neighbours = $current->getNode()->getNeighbours();
foreach ($neighbours as $neighbour) {
if ($closed->has($neighbour)) {
continue;
}
if (!$open->has($neighbour)) {
$open->add($neighbour, $this->getHeuristic($current->getNode(), $neighbour) + $neighbour->getCost());
}
}
}
return $path;
}
public function providerForValidInput()
{
$ruleNotEmpty = new Each($this->getRuleMock(true));
$ruleAlphaItemIntKey = new Each($this->getRuleMock(true), $this->getRuleMock(true));
$ruleOnlyKeyValidation = new Each(null, $this->getRuleMock(true));
$intStack = new \SplStack();
$intStack->push(1);
$intStack->push(2);
$intStack->push(3);
$intStack->push(4);
$intStack->push(5);
$stdClass = new \stdClass();
$stdClass->name = 'Emmerson';
$stdClass->age = 22;
return [[$ruleNotEmpty, [1, 2, 3, 4, 5]], [$ruleNotEmpty, $intStack], [$ruleNotEmpty, $stdClass], [$ruleAlphaItemIntKey, ['a', 'b', 'c', 'd', 'e']], [$ruleOnlyKeyValidation, ['a', 'b', 'c', 'd', 'e']]];
}
