function PseudoIndex::check

Returns true if the selector part matches the given node, false otherwise

Parameters

Node $node Node:

Node $parent Parent node:

Return value

bool

Overrides Part::check

File

vendor/mck89/peast/lib/Peast/Selector/Node/Part/PseudoIndex.php, line 78

Class

PseudoIndex

Selector part index pseudo class

Namespace

Peast\Selector\Node\Part

Code

public function check(Node $node, $parent = null) {
    $props = Utils::getExpandedNodeProperties($parent);
    $count = count($props);
    $reverse = $this->name === "nth-last-child";
    if ($reverse) {
        $start = $count - 1 - ($this->offset - 1);
        $step = $this->step * -1;
        if ($step > 0) {
            $reverse = false;
        }
    }
    else {
        $start = $this->offset - 1;
        $step = $this->step;
        if ($step < 0) {
            $reverse = true;
        }
    }
    
    //Step 0 will cause an infinite loop, so it must be set to the
    
    //number of props so that it will execute only one iteration
    if (!$step) {
        $step = $reverse ? -$count : $count;
    }
    for ($i = $start; $reverse && $i >= 0 || !$reverse && $i < $count; $i += $step) {
        if (isset($props[$i]) && $props[$i] === $node) {
            return true;
        }
    }
    return false;
}