/**
* Splits the given text into a list of Fragments. This is roughly done by
* reversing the text and parsing from the bottom to the top. This way we
* can check for 'On <date>, <author> wrote:' lines above quoted blocks.
*
* @param string $text A email body.
* @param string $encoding Optional encoding to be used when parsing the text.
* @return array A list of parsed Fragments.
*/
public static function read($text, $encoding = null)
{
// Resets everything before starting
self::$_foundVisible = false;
self::$_fragments = array();
self::$_fragment = null;
self::$_encoding = $encoding;
// Check for multi-line reply headers. Some clients break up
// the "On DATE, NAME <EMAIL> wrote:" line into multiple lines.
$text = preg_replace_callback('/^(On.*wrote:)$/msU', function ($matches) {
return str_replace("\n", ' ', $matches[1]);
}, $text);
// Normalize line breaks.
$text = str_replace("\r\n", "\n", $text);
// The text is reversed initially due to the way we check for hidden fragments.
$text = Fragment::reverse($text, self::$_encoding);
// Strip any extra new lines or spaces from start.
$text = rtrim($text);
// Split into lines.
$lines = preg_split("/\n/", $text);
// Scan each line of the email content.
foreach ($lines as $line) {
self::_scanLine($line);
}
// Free variables
unset($text, $lines);
// Finish up the final fragment. Finishing a fragment will detect any
// attributes (hidden, signature, reply), and join each line into a string.
self::_finishFragment();
// Now that parsing is done, reverse the order.
self::$_fragments = array_reverse(self::$_fragments);
return self::$_fragments;
}
