static function choose($articles)
{
$consumed = array();
$consumeArticle = function (&$spot, $i) use(&$articles, &$consumed) {
$spot = array('title' => @$articles[$i]['title'], 'image' => @$articles[$i]['image'], 'dims' => $spot);
$consumed[] = $i;
};
$taller = self::findFirstTall($articles);
$large = self::findFirstLarge($articles, $consumed);
// Get formats based on whether there is an image that could
// work as a 1x2 image
// Disable Tall formats for now since they are causing problems
$possibleFormats = self::getPossibleWideFormats();
$seed = self::stringToNumber($articles[0]['image']->getSha1());
mt_srand($seed);
$pos = mt_rand(0, count($possibleFormats) - 1);
$format = $possibleFormats[$pos];
// Only consider the first count($articles) - $trim articles
// from the stream because we don't want to leave out of order
// elements unconsumed.
$spots = 0;
foreach ($format as $spot) {
if ($spot) {
$spots++;
}
}
if (count($articles) > $spots) {
array_splice($articles, $spots);
}
// If we have a suitable 1x2 image, use it first -- there is at
// most one 1x2 image per format
if ($taller >= 0) {
foreach ($format as &$spot) {
// find the taller image spot
if ($spot == '1x2') {
$consumeArticle($spot, $taller);
break;
}
}
}
// If we have a suitable 2x2 image, use that next -- this is at
// most one 2x2 image per format
if ($large >= 0) {
foreach ($format as &$spot) {
if (is_string($spot) && $spot == '2x2') {
$consumeArticle($spot, $large);
break;
}
}
}
// Next, sort the images by "flatness" to put the appropriate
// images into 2x1 slots. There can be multiple 2x1 slots in a
// format.
$flatness = self::sortByFlatness($articles, $consumed);
foreach ($format as &$spot) {
if (count($flatness) == 0) {
break;
}
if (is_string($spot) && $spot == '2x1') {
$flat = array_shift($flatness);
// Make the default image the wide one
if (preg_match("@Default_wikihow_(green|blue)(_intl)?.png@", $articles[$flat]['image']->getPath())) {
$articles[$flat]['image'] = Wikitext::getDefaultTitleImage($articles[$flat]['title'], true);
}
$consumeArticle($spot, $flat);
}
}
// Fill the rest of the spots with the rest of the articles --
// this should only be 1x1 elements now.
$i = 0;
foreach ($format as &$spot) {
// skip already consumed articles
while (in_array($i, $consumed)) {
$i++;
}
if (!$spot || !is_string($spot)) {
// nothing
} elseif ($i < count($articles)) {
$consumeArticle($spot, $i);
$i++;
} else {
$spot = array('title' => null, 'image' => null, 'dims' => $spot);
}
}
return array($format, $consumed);
}
