Habari\HTMLTokenSet::find_slice PHP Метод

    protected function find_slice($offset, $name, array $attr)
    {
        // find start:
        $foundStart = false;
        for (; $offset < count($this->tokens); $offset++) {
            // short circuit if possible
            if ($this->tokens[$offset]['type'] != HTMLTokenizer::NODE_TYPE_ELEMENT_OPEN) {
                continue;
            }
            if ($this->tokens[$offset]['name'] != $name) {
                continue;
            }
            // check attributes
            if (!count($attr)) {
                $foundStart = true;
                break;
                // To: FOUNDSTARTBREAKPOINT
            }
            foreach ($attr as $compareName => $compareVal) {
                if (isset($this->tokens[$offset]['attrs'][$compareName]) && stripos($this->tokens[$offset]['attrs'][$compareName], $compareVal) !== false) {
                    $foundStart = true;
                    break 2;
                    // To: FOUNDSTARTBREAKPOINT
                }
            }
        }
        // Fake label: FOUNDSTARTBREAKPOINT
        // short circuit if possible:
        if (!$foundStart) {
            return false;
        }
        $startOffset = $offset;
        // find the closing tag
        // (keep a stack so we don't mistake a nested node for this closing node)
        $stackDepth = 0;
        $foundEnd = false;
        for (; $offset < count($this->tokens); $offset++) {
            switch ($this->tokens[$offset]['type']) {
                case HTMLTokenizer::NODE_TYPE_ELEMENT_OPEN:
                    if ($this->tokens[$offset]['name'] == $name) {
                        ++$stackDepth;
                    }
                    break;
                case HTMLTokenizer::NODE_TYPE_ELEMENT_CLOSE:
                    if ($this->tokens[$offset]['name'] == $name) {
                        --$stackDepth;
                    }
                    break;
                    // default: skip
            }
            if ($stackDepth <= 0) {
                $foundEnd = true;
                break;
            }
        }
        // short circuit if possible:
        if (!$foundEnd) {
            return false;
        }
        $offsetLength = $offset - $startOffset + 1;
        // now, place the found set into a new HTMLTokenSet:
        $slice = new HTMLTokenSet($this->escape);
        $slice->sliceOffsetBegin = $startOffset;
        $slice->sliceOffsetLength = $offsetLength;
        $slice->tokens = array_slice($this->tokens, $slice->sliceOffsetBegin, $slice->sliceOffsetLength);
        return $slice;
    }