DateGranularity.php in Date 8

Definition of DateGranularity.

Namespace

Drupal\date_api

File

date_api/lib/Drupal/date_api/DateGranularity.php

<?php

/**
 * @file
 * Definition of DateGranularity.
 */
namespace Drupal\date_api;


/**
 * This class manages granularity. It can set granularity, get it from
 * an array, get it from a format string, see if the array has any
 * time or date elements, set and unset various granularity parts,
 * create a nongranularity array of the granularity parts that
 * are NOT in a given granularity array, identify the precision
 * level of a granularity array, and more.
 *
 * Most methods are static and can be called directly.
 *
 */
class DateGranularity {

  // Static values used in massaging this date.
  public static $granularity_parts = array(
    'year',
    'month',
    'day',
    'hour',
    'minute',
    'second',
  );
  public static $date_parts = array(
    'year',
    'month',
    'day',
  );
  public static $time_parts = array(
    'hour',
    'minute',
    'second',
  );

  // An array to store the granularity of this date, as an array of date parts.
  public $granularity = array();

  // Flags to indicate whether the date has time and date parts.
  public $time_only = FALSE;
  public $date_only = FALSE;

  /**
   * Constructor.
   * Create a granularity instance.
   *
   * @param mixed $input
   *   A granularity array.
   */
  public function __construct($input = NULL, $type = 'array') {
    switch ($type) {
      case 'time':
        $this
          ->setGranularityFromTime($input);
        break;
      case 'format':
        $this
          ->setGranularityFromFormat($input);
        break;
      default:
        $this
          ->setGranularityFromArray($input);
    }
  }

  /**
   * Constructs an array of granularity options and their labels.
   *
   * @return array
   *   An array of translated date parts, keyed by their machine name.
   */
  public static function granularityNames() {
    return array(
      'year' => t('Year', array(), array(
        'context' => 'datetime',
      )),
      'month' => t('Month', array(), array(
        'context' => 'datetime',
      )),
      'day' => t('Day', array(), array(
        'context' => 'datetime',
      )),
      'hour' => t('Hour', array(), array(
        'context' => 'datetime',
      )),
      'minute' => t('Minute', array(), array(
        'context' => 'datetime',
      )),
      'second' => t('Second', array(), array(
        'context' => 'datetime',
      )),
    );
  }

  /**
   * Adds a granularity entry to the array.
   *
   * @param string $part
   *   A single date part.
   */
  public function addGranularity($part) {
    $this->granularity[] = $part;
    $this->granularity = array_unique($this->granularity);
  }

  /**
   * Removes a granularity entry from the array.
   *
   * @param string $part
   *   A single date part.
   */
  public function removeGranularity($part) {
    if ($key = array_search($part, $this->granularity)) {
      unset($this->granularity[$key]);
    }
  }

  /**
   * Create a granularity array from a string time value.
   *
   * @param string $time
   *   A date string.
   */
  public function setGranularityFromTime($time) {
    $this->granularity = array();
    $temp = date_parse($time);
    foreach ($this->granularity_parts as $part) {
      if (isset($temp[$part]) && is_numeric($temp[$part])) {
        $this
          ->addGranularity($part);
      }
    }
  }

  /**
   * Create a granularity array from a passed in array.
   *
   * @param array $array
   *   An array of date values, keyed by date part.
   */
  public function setGranularityFromArray($array) {
    $this->granularity = $array;
  }

  /**
   * Create a granularity array from a date format string.
   *
   * @param string $format
   *   A date format string.
   */
  public function setGranularityFromFormat($format) {
    $this->granularity = $this
      ->formatOrder($format);
  }

  /**
   * Determines if a date is valid for a given granularity.
   *
   * @param array|null $granularity
   *   An array of date parts. Defaults to NULL.
   * @param bool $flexible
   *   TRUE if the granuliarty is flexible, FALSE otherwise. Defaults to FALSE.
   *
   * @return bool
   *   Whether a date is valid for a given granularity.
   */
  public function validGranularity($granularity = NULL, $flexible = FALSE) {
    $true = $this
      ->hasGranularity() && (!$granularity || $flexible || $this
      ->hasGranularity($granularity));
    if (!$true && $granularity) {
      foreach ((array) $granularity as $part) {
        if (!$this
          ->hasGranularity($part)) {
          $this->errors[$part] = t("The @part is missing.", array(
            '@part' => $part,
          ));
        }
      }
    }
    return $true;
  }

  /**
   * Checks granularity array for a given entry.
   *
   * @param array|null $parts
   *   An array of date parts. Defaults to NULL.
   *
   * @returns bool
   *   TRUE if the date part is present in the date's granularity.
   */
  public static function hasGranularity($parts, $granularity) {
    if (is_array($parts)) {
      foreach ($parts as $part) {
        if (!in_array($part, $granularity)) {
          return FALSE;
        }
      }
      return TRUE;
    }
    return in_array($parts, $granularity);
  }

  /**
   * Removes unwanted date parts from a date.
   *
   * In common usage we should not unset timezone through this.
   *
   * @param array $array
   *   An array of date parts.
   */
  public static function limitGranularity($array) {
    foreach (self::$granularity_parts as $key => $val) {
      if (!in_array($val, $array)) {
        unset($array[$key]);
      }
    }
    return $array;
  }

  /**
   * Sorts a granularity array.
   *
   * @param array $array
   *   An array of date parts.
   */
  public static function sorted($array) {
    return array_intersect(self::$granularity_parts, $array);
  }

  /**
   * Constructs an array of granularity based on a given precision.
   *
   * @param string $precision
   *   A granularity item.
   *
   * @return array
   *   A granularity array containing the given precision and all those above it.
   *   For example, passing in 'month' will return array('year', 'month').
   */
  public static function arrayFromPrecision($precision) {
    $granularity_array = self::$granularity_parts;
    switch ($precision) {
      case 'year':
        return array_slice($granularity_array, -6, 1);
      case 'month':
        return array_slice($granularity_array, -6, 2);
      case 'day':
        return array_slice($granularity_array, -6, 3);
      case 'hour':
        return array_slice($granularity_array, -6, 4);
      case 'minute':
        return array_slice($granularity_array, -6, 5);
      default:
        return $granularity_array;
    }
  }

  /**
   * Give a granularity array, return the highest precision.
   *
   * @param array $array
   *   An array of date parts.
   *
   * @return string
   *   The most precise element in a granularity array.
   */
  public static function precision($array) {
    $input = self::sorted($array);
    return array_pop($input);
  }

  /**
   * Constructs a valid DATETIME format string, limited to a certain granularity.
   */
  public static function format($granularity) {
    if (is_array($granularity)) {
      $granularity = self::precision($granularity);
    }
    $format = 'Y-m-d H:i:s';
    switch ($granularity) {
      case 'year':
        return substr($format, 0, 1);
      case 'month':
        return substr($format, 0, 3);
      case 'day':
        return substr($format, 0, 5);
      case 'hour':
        return substr($format, 0, 7);
      case 'minute':
        return substr($format, 0, 9);
      default:
        return $format;
    }
  }

  /**
   * Limits a date format to include only elements from a given granularity array.
   *
   * Example:
   *   DateGranularity::limitFormat('F j, Y - H:i', array('year', 'month', 'day'));
   *   returns 'F j, Y'
   *
   * @param string $format
   *   A date format string.
   * @param array $array
   *   An array of allowed date parts, all others will be removed.
   *
   * @return string
   *   The format string with all other elements removed.
   */
  public static function limitFormat($format, $array) {

    // If punctuation has been escaped, remove the escaping. Done using strtr()
    // because it is easier than getting the escape character extracted using
    // preg_replace().
    $replace = array(
      '\\-' => '-',
      '\\:' => ':',
      "\\'" => "'",
      '\\. ' => ' . ',
      '\\,' => ',',
    );
    $format = strtr($format, $replace);

    // Get the 'T' out of ISO date formats that don't have both date and time.
    if (!self::hasTime($array) || !self::hasDate($array)) {
      $format = str_replace('\\T', ' ', $format);
      $format = str_replace('T', ' ', $format);
    }
    $regex = array();
    if (!DateGranularity::hasTime($array)) {
      $regex[] = '((?<!\\\\)[a|A])';
    }

    // Create regular expressions to remove selected values from string.
    // Use (?<!\\\\) to keep escaped letters from being removed.
    foreach (self::nongranularity($array) as $element) {
      switch ($element) {
        case 'year':
          $regex[] = '([\\-/\\.,:]?\\s?(?<!\\\\)[Yy])';
          break;
        case 'day':
          $regex[] = '([\\-/\\.,:]?\\s?(?<!\\\\)[l|D|d|dS|j|jS|N|w|W|z]{1,2})';
          break;
        case 'month':
          $regex[] = '([\\-/\\.,:]?\\s?(?<!\\\\)[FMmn])';
          break;
        case 'hour':
          $regex[] = '([\\-/\\.,:]?\\s?(?<!\\\\)[HhGg])';
          break;
        case 'minute':
          $regex[] = '([\\-/\\.,:]?\\s?(?<!\\\\)[i])';
          break;
        case 'second':
          $regex[] = '([\\-/\\.,:]?\\s?(?<!\\\\)[s])';
          break;
        case 'timezone':
          $regex[] = '([\\-/\\.,:]?\\s?(?<!\\\\)[TOZPe])';
          break;
      }
    }

    // Remove empty parentheses, brackets, pipes.
    $regex[] = '(\\(\\))';
    $regex[] = '(\\[\\])';
    $regex[] = '(\\|\\|)';

    // Remove selected values from string.
    $format = trim(preg_replace($regex, array(), $format));

    // Remove orphaned punctuation at the beginning of the string.
    $format = preg_replace('`^([\\-/\\.,:\'])`', '', $format);

    // Remove orphaned punctuation at the end of the string.
    $format = preg_replace('([\\-/,:\']$)', '', $format);
    $format = preg_replace('(\\$)', '', $format);

    // Trim any whitespace from the result.
    $format = trim($format);

    // After removing the non-desired parts of the format, test if the only things
    // left are escaped, non-date, characters. If so, return nothing.
    // Using S instead of w to pick up non-ASCII characters.
    $test = trim(preg_replace('(\\\\\\S{1,3})', '', $format));
    if (empty($test)) {
      $format = '';
    }
    return $format;
  }

  /**
   * Converts a format to an ordered array of granularity parts.
   *
   * Example:
   *   DateGranularity::formatOrder('m/d/Y H:i')
   *   returns
   *     array(
   *       0 => 'month',
   *       1 => 'day',
   *       2 => 'year',
   *       3 => 'hour',
   *       4 => 'minute',
   *     );
   *
   * @param string $format
   *   A date format string.
   *
   * @return array
   *   An array of ordered granularity elements from the given format string.
   */
  public static function formatOrder($format) {
    $order = array();
    if (empty($format)) {
      return $order;
    }
    $max = strlen($format);
    for ($i = 0; $i <= $max; $i++) {
      if (!isset($format[$i])) {
        break;
      }
      switch ($format[$i]) {
        case 'd':
        case 'j':
          $order[] = 'day';
          break;
        case 'F':
        case 'M':
        case 'm':
        case 'n':
          $order[] = 'month';
          break;
        case 'Y':
        case 'y':
          $order[] = 'year';
          break;
        case 'g':
        case 'G':
        case 'h':
        case 'H':
          $order[] = 'hour';
          break;
        case 'i':
          $order[] = 'minute';
          break;
        case 's':
          $order[] = 'second';
          break;
      }
    }
    return $order;
  }

  /**
   * Strips out unwanted granularity elements.
   *
   * @param array $array
   *   An array like ('year', 'month', 'day', 'hour', 'minute', 'second');
   *
   * @return array
   *   A reduced set of granularitiy elements.
   */
  public static function nongranularity($array) {
    return array_diff(self::$granularity_parts, (array) $array);
  }

  /**
   * Determines if the granularity contains a time portion.
   *
   * @param array $array
   *   An array of allowed date parts, all others will be removed.
   *
   * @return bool
   *   TRUE if the granularity contains a time portion, FALSE otherwise.
   */
  public static function hasTime($array) {
    return (bool) count(array_intersect($array, self::$time_parts));
  }

  /**
   * Determines if the granularity contains a date portion.
   *
   * @param array $array
   *   An array of allowed date parts, all others will be removed.
   *
   * @return bool
   *   TRUE if the granularity contains a date portion, FALSE otherwise.
   */
  public static function hasDate($array) {
    return (bool) count(array_intersect($array, self::$date_parts));
  }

  /**
   * Helper function to get a format for a specific part of a date field.
   *
   * @param string $part
   *   The date field part, either 'time' or 'date'.
   * @param string $format
   *   A date format string.
   *
   * @return string
   *   The date format for the given part.
   */
  public static function partFormat($part, $format) {
    switch ($part) {
      case 'date':
        return self::limitFormat($format, self::$date_parts);
      case 'time':
        return self::limitFormat($format, self::$time_parts);
      default:
        return self::limitFormat($format, array(
          $part,
        ));
    }
  }

}

Classes

Name	Description
DateGranularity	This class manages granularity. It can set granularity, get it from an array, get it from a format string, see if the array has any time or date elements, set and unset various granularity parts, create a nongranularity array of the granularity parts…