public static function strToDate($string)
{
// Parse 'yesterday'/'today'/'tomorrow'
$lc = strtolower($string);
if ($lc == 'yesterday' || $lc == self::getString('date.yesterday')) {
$string = date("Y-m-d", strtotime('yesterday'));
} else {
if ($lc == 'today' || $lc == self::getString('date.today')) {
$string = date("Y-m-d");
} else {
if ($lc == 'tomorrow' || $lc == self::getString('date.tomorrow')) {
$string = date("Y-m-d", strtotime('tomorrow'));
}
}
}
$date = array();
// skip empty things
if (!$string) {
return $date;
}
$string = preg_replace(array("/^\\s+/", "/\\s+\$/", "/\\s+/"), array("", "", " "), $string);
// first, directly inspect the string
preg_match(self::$slashRE, $string, $m);
if ($m && (empty($m[5]) || $m[3] == $m[5] || $m[3] == "年" && $m[5] == "月") && (!empty($m[2]) && !empty($m[4]) && !empty($m[6]) || empty($m[1]) && empty($m[7]))) {
// require that either all parts are found,
// or else this is the entire date field
// figure out date based on parts
if (mb_strlen($m[2]) == 3 || mb_strlen($m[2]) == 4 || $m[3] == "年") {
// ISO 8601 style date (big endian)
$date['year'] = $m[2];
$date['month'] = $m[4];
$date['day'] = $m[6];
} else {
// local style date (middle or little endian)
$date['year'] = $m[6];
$country = substr(self::$locale, 3);
if ($country == "US" || $country == "FM" || $country == "PW" || $country == "PH") {
// The Philippines
$date['month'] = $m[2];
$date['day'] = $m[4];
} else {
$date['month'] = $m[4];
$date['day'] = $m[2];
}
}
if ($date['year']) {
$date['year'] = (int) $date['year'];
}
if ($date['day']) {
$date['day'] = (int) $date['day'];
}
if ($date['month']) {
$date['month'] = (int) $date['month'];
if ($date['month'] > 12) {
// swap day and month
$tmp = $date['day'];
$date['day'] = $date['month'];
$date['month'] = $tmp;
}
}
if ((empty($date['month']) || $date['month'] <= 12) && (empty($date['day']) || $date['day'] <= 31)) {
if (!empty($date['year']) && $date['year'] < 100) {
// for two digit years, determine proper
$year = date('Y');
$twoDigitYear = date('y');
$century = $year - $twoDigitYear;
if ($date['year'] <= $twoDigitYear) {
// assume this date is from our century
$date['year'] = $century + $date['year'];
} else {
// assume this date is from the previous century
$date['year'] = $century - 100 + $date['year'];
}
}
Z_Core::debug("DATE: retrieved with algorithms: " . json_encode($date));
$date['part'] = $m[1] . $m[7];
} else {
// give up; we failed the sanity check
Z_Core::debug("DATE: algorithms failed sanity check");
$date = array("part" => $string);
}
} else {
//Zotero.debug("DATE: could not apply algorithms");
$date['part'] = $string;
}
// couldn't find something with the algorithms; use regexp
// YEAR
if (empty($date['year'])) {
if (preg_match(self::$yearRE, $date['part'], $m)) {
$date['year'] = $m[2];
$date['part'] = $m[1] . $m[3];
Z_Core::debug("DATE: got year (" . $date['year'] . ", " . $date['part'] . ")");
}
}
// MONTH
if (empty($date['month'])) {
// compile month regular expression
$months = array('Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec');
// If using a non-English bibliography locale, try those too
if (self::$locale != 'en-US') {
throw new Exception("Unimplemented");
//$months = array_merge($months, .concat(Zotero.$date['month']s.short);
}
if (!self::$monthRE) {
self::$monthRE = "/^(.*)\\b(" . implode("|", $months) . ")[^ ]*(?: (.*)\$|\$)/iu";
}
if (preg_match(self::$monthRE, $date['part'], $m)) {
// Modulo 12 in case we have multiple languages
$date['month'] = array_search(ucwords(strtolower($m[2])), $months) % 12 + 1;
$date['part'] = $m[1] . (isset($m[3]) ? $m[3] : '');
Z_Core::debug("DATE: got month (" . $date['month'] . ", " . $date['part'] . ")");
}
}
// DAY
if (empty($date['day'])) {
// compile day regular expression
if (!self::$dayRE) {
$daySuffixes = preg_replace("/, ?/", "|", self::getString("date.daySuffixes"));
self::$dayRE = "/\\b([0-9]{1,2})(?:" . $daySuffixes . ")?\\b(.*)/iu";
}
if (preg_match(self::$dayRE, $date['part'], $m, PREG_OFFSET_CAPTURE)) {
$day = (int) $m[1][0];
// Sanity check
if ($day <= 31) {
$date['day'] = $day;
if ($m[0][1] > 0) {
$date['part'] = substr($date['part'], 0, $m[0][1]);
if ($m[2][0]) {
$date['part'] .= " " . $m[2][0];
}
} else {
$date['part'] = $m[2][0];
}
Z_Core::debug("DATE: got day (" . $date['day'] . ", " . $date['part'] . ")");
}
}
}
// clean up date part
if ($date['part']) {
$date['part'] = preg_replace(array("/^[^A-Za-z0-9]+/", "/[^A-Za-z0-9]+\$/"), "", $date['part']);
}
if ($date['part'] === "" || !isset($date['part'])) {
unset($date['part']);
}
return $date;
}