Apple_Exporter\Builders\Components::group_body_components PHP Method

    private function group_body_components($components)
    {
        $new_components = array();
        $body_collector = null;
        $i = 0;
        $len = count($components);
        while ($i < $len) {
            $component = $components[$i];
            // If the component is not body, no need to group, just add.
            if ('body' != $component['role']) {
                if (!is_null($body_collector)) {
                    $body_collector['text'] = $body_collector['text'];
                    $new_components[] = $body_collector;
                    $body_collector = null;
                }
                $new_components[] = $component;
                $i++;
                continue;
            }
            // If the component is a body, test if it is an anchor target. For
            // grouping an anchor target body several things need to happen:
            if (isset($component['identifier']) && isset($components[$i + 1]['anchor']) && isset($components[$i + 2]['role']) && 'body' == $components[$i + 2]['role'] && !isset($components[$i + 2]['identifier'])) {
                // Collect
                if (!is_null($body_collector)) {
                    $body_collector['text'] = $body_collector['text'];
                    $new_components[] = $body_collector;
                    $body_collector = null;
                }
                $new_components[] = $components[$i + 1];
                $body_collector = $component;
                $body_collector['text'] .= $components[$i + 2]['text'];
                $i += 3;
                continue;
            }
            // Another case for anchor target grouping is when the component was anchored
            // to the next element rather than the previous one, in that case:
            if (isset($component['identifier']) && isset($components[$i + 1]['role']) && 'body' == $components[$i + 1]['role'] && !isset($components[$i + 1]['identifier'])) {
                // Collect
                if (!is_null($body_collector)) {
                    $body_collector['text'] = $body_collector['text'];
                    $new_components[] = $body_collector;
                    $body_collector = null;
                }
                $body_collector = $component;
                $body_collector['text'] .= $components[$i + 1]['text'];
                $i += 2;
                continue;
            }
            // If the component was an anchor target but failed to match the
            // requirements for grouping, just add it, don't group it.
            if (isset($component['identifier'])) {
                if (!is_null($body_collector)) {
                    $body_collector['text'] = $body_collector['text'];
                    $new_components[] = $body_collector;
                    $body_collector = null;
                }
                $new_components[] = $component;
            } else {
                // The component is not an anchor target, just collect.
                if (is_null($body_collector)) {
                    $body_collector = $component;
                } else {
                    $body_collector['text'] .= $component['text'];
                }
            }
            $i++;
        }
        // Make a final check for the body collector, as it might not be empty
        if (!is_null($body_collector)) {
            $body_collector['text'] = $body_collector['text'];
            $new_components[] = $body_collector;
        }
        // Trim all body components before returning.
        // Also set the layout for the final body component.
        $cover_index = null;
        foreach ($new_components as $i => $component) {
            if ('body' == $component['role']) {
                $new_components[$i]['text'] = trim($new_components[$i]['text']);
                if ($i + 1 === count($new_components)) {
                    $new_components[$i]['layout'] = 'body-layout-last';
                }
            }
            // Find the location of the cover for later
            if ('header' == $component['role']) {
                $cover_index = $i;
            }
        }
        // Finally, all components after the cover must be grouped
        // to avoid issues with parallax text scroll.
        //
        // If no cover was found, this is unnecessary.
        if (null !== $cover_index) {
            $regrouped_components = array_slice($new_components, 0, $cover_index + 1);
            if (count($new_components) > $cover_index + 1) {
                $regrouped_components[] = array('role' => 'container', 'layout' => array('columnStart' => 0, 'columnSpan' => 7, 'ignoreDocumentMargin' => true), 'style' => array('backgroundColor' => $this->get_setting('body_background_color')), 'components' => array_slice($new_components, $cover_index + 1));
            }
        } else {
            $regrouped_components = $new_components;
        }
        return $regrouped_components;
    }