public function IngredientQuantityUtility::getQuantityFromDecimal in Recipe 8.2

Converts an ingredient's quantity from decimal to fraction.

Parameters

float $ingredient_quantity: The ingredient quantity formatted as a decimal.

string $fraction_format: A string representing the fraction format, used by sprintf().

bool $edit_mode: Whether or not the ingredient is being edited.

Return value

string The ingredient quantity formatted as a fraction.

File

modules/ingredient/src/Utility/IngredientQuantityUtility.php, line 25

Class

IngredientQuantityUtility

Provides the ingredient.quantity service.

Namespace

Drupal\ingredient\Utility

Code

public function getQuantityFromDecimal($ingredient_quantity, $fraction_format = '{%d} %d⁄%d', $edit_mode = FALSE) {
  if (strpos($ingredient_quantity, '.')) {
    $decimal = abs($ingredient_quantity);
    $whole = floor($decimal);
    $numerator = 0;
    $denominator = 1;
    $top_heavy = 0;
    $power = 1;
    $flag = 0;
    while ($flag == 0) {
      $argument = $decimal * $power;
      if ($argument == floor($argument)) {
        $flag = 1;
      }
      else {
        $power = $power * 10;
      }
    }

    // We have to workaround for repeating, non-exact decimals for thirds,
    // sixths, ninths, twelfths.
    $overrides = [
      // Thirds.
      '3333' => [
        1,
        3,
      ],
      '6666' => [
        2,
        3,
      ],
      '9999' => [
        3,
        3,
      ],
      '1666' => [
        1,
        6,
      ],
      // Sixths.
      '8333' => [
        5,
        6,
      ],
      // Ninths.
      '1111' => [
        1,
        9,
      ],
      '2222' => [
        2,
        9,
      ],
      '4444' => [
        4,
        9,
      ],
      '5555' => [
        5,
        9,
      ],
      '7777' => [
        7,
        9,
      ],
      '8888' => [
        8,
        9,
      ],
      '0833' => [
        1,
        12,
      ],
      '4166' => [
        5,
        12,
      ],
      '5833' => [
        7,
        12,
      ],
      // twelfths.
      '9166' => [
        11,
        12,
      ],
    ];

    // Truncate the whole part to get just the fractional part.
    $conversionstr = substr((string) ($decimal - floor($decimal)), 2, 4);
    if (array_key_exists($conversionstr, $overrides)) {
      if ($overrides[$conversionstr][0] == $overrides[$conversionstr][1]) {
        return $whole + 1;
      }
      $denominator = $overrides[$conversionstr][1];
      $numerator = floor($decimal) * $denominator + $overrides[$conversionstr][0];
    }
    else {
      $numerator = $decimal * $power;
      $denominator = $power;
    }

    // Repeating decimals have been corrected.
    $gcd = $this
      ->getGcd($numerator, $denominator);
    $numerator = $numerator / $gcd;
    $denominator = $denominator / $gcd;
    $top_heavy = $numerator;
    $numerator = abs($top_heavy) - abs($whole) * $denominator;
    $ingredient_quantity = sprintf($fraction_format, $whole, $numerator, $denominator);
    if ($whole == 0 && strpos($ingredient_quantity, '{') >= 0) {

      // Remove anything in curly braces.
      $ingredient_quantity = preg_replace('/{.*}/', '', $ingredient_quantity);
    }
    else {

      // Remove just the curly braces, but keep everything between them.
      $ingredient_quantity = preg_replace('/{|}/', '', $ingredient_quantity);
    }

    // In edit mode we don't want to show html tags like <sup> and <sub>.
    if ($edit_mode) {
      $ingredient_quantity = strip_tags($ingredient_quantity);
    }
  }
  return Xss::filterAdmin(trim($ingredient_quantity));
}