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<?php namespace Done\Subtitles;
class Helpers
{
public static function shouldBlockTimeBeShifted($from, $till, $block_start, $block_end)
{
if ($block_end < $from) {
return false;
}
if ($till === null) {
return true;
}
return $till >= $block_start;
}
public static function removeUtf8Bom($text)
{
$bom = pack('H*', 'EFBBBF');
$text = preg_replace("/^$bom/", '', $text);
return $text;
}
public static function getConverter($extension)
{
$class_name = ucfirst($extension) . 'Converter';
if (!file_exists(__DIR__ . '/Converters/' . $class_name . '.php')) {
throw new \Exception('unknown format: ' . $extension);
}
$full_class_name = "\\Done\\Subtitles\\" . $class_name;
return new $full_class_name();
}
public static function fileExtension($filename) {
$parts = explode('.', $filename);
$extension = end($parts);
$extension = strtolower($extension);
return $extension;
}
public static function normalizeNewLines($file_content)
{
$file_content = str_replace("\r\n", "\n", $file_content);
$file_content = str_replace("\r", "\n", $file_content);
return $file_content;
}
public static function shiftBlockTime($block, $seconds, $from, $till)
{
if (!static::blockTimesWithinRange($block, $from, $till)) {
return $block;
}
// start
$tmp_from_start = $block['start'] - $from;
$start_percents = $tmp_from_start / ($till - $from);
$block['start'] += $seconds * $start_percents;
// end
$tmp_from_start = $block['end'] - $from;
$end_percents = $tmp_from_start / ($till - $from);
$block['end'] += $seconds * $end_percents;
return $block;
}
public static function blockTimesWithinRange($block, $from, $till)
{
return ($from <= $block['start'] && $block['start'] <= $till && $from <= $block['end'] && $block['end'] <= $till);
}
}