function recipe_ingredient_quantity_from_decimal in Recipe 5

Same name and namespace in other branches

1. 6 recipe.module \recipe_ingredient_quantity_from_decimal()
2. 7.2 recipe.module \recipe_ingredient_quantity_from_decimal()
3. 7 recipe.module \recipe_ingredient_quantity_from_decimal()

Converts an ingredient's quantity from decimal to fraction

2 calls to recipe_ingredient_quantity_from_decimal()

recipe_form in ./recipe.module

Implementation of hook_form().

theme_node_recipe in ./recipe.module

A custom theme function.

File

./recipe.module, line 588

recipe.module - share recipes for drupal 5.x

Code

function recipe_ingredient_quantity_from_decimal($ingredient_quantity) {
  if (strpos($ingredient_quantity, '.') && variable_get('recipe_fraction_display', t('{%d} %d⁄%d'))) {
    $decimal = $ingredient_quantity;
    if ($decimal == 0) {
      $whole = 0;
      $numerator = 0;
      $denominator = 1;
      $top_heavy = 0;
    }
    else {
      $sign = 1;
      if ($decimal < 0) {
        $sign = -1;
      }
    }
    if (floor(abs($decimal)) == 0) {
      $whole = 0;
      $conversion = abs($decimal);
    }
    else {
      $whole = floor(abs($decimal));
      $conversion = abs($decimal);
    }
    $power = 1;
    $flag = 0;
    while ($flag == 0) {
      $argument = $conversion * $power;
      if ($argument == floor($argument)) {
        $flag = 1;
      }
      else {
        $power = $power * 10;
      }
    }

    // workaround for thirds, sixths, ninths, twelfths
    $overrides = array(
      '3333' => array(
        1,
        3,
      ),
      '6666' => array(
        2,
        3,
      ),
      '9999' => array(
        3,
        3,
      ),
      // thirds
      '1666' => array(
        1,
        6,
      ),
      '8333' => array(
        5,
        6,
      ),
      // sixths
      '1111' => array(
        1,
        9,
      ),
      '2222' => array(
        2,
        9,
      ),
      '4444' => array(
        4,
        9,
      ),
      '5555' => array(
        5,
        9,
      ),
      '7777' => array(
        7,
        9,
      ),
      '8888' => array(
        8,
        9,
      ),
      // ninths
      '0833' => array(
        1,
        12,
      ),
      '4166' => array(
        5,
        12,
      ),
      '5833' => array(
        7,
        12,
      ),
      '9166' => array(
        11,
        12,
      ),
    );
    $conversionstr = substr((string) ($conversion - floor($conversion)), 2, 4);
    if (array_key_exists($conversionstr, $overrides)) {
      if ($overrides[$conversionstr][0] == $overrides[$conversionstr][1]) {
        return ($whole + 1) * $sign;
      }
      $denominator = $overrides[$conversionstr][1];
      $numerator = floor($conversion) * $denominator + $overrides[$conversionstr][0];
    }
    else {
      $numerator = $conversion * $power;
      $denominator = $power;
    }
    $hcf = recipe_euclid($numerator, $denominator);
    $numerator = $numerator / $hcf;
    $denominator = $denominator / $hcf;
    $whole = $sign * $whole;
    $top_heavy = $sign * $numerator;
    $numerator = abs($top_heavy) - abs($whole) * $denominator;
    if ($whole == 0 && $sign == -1) {
      $numerator = $numerator * $sign;
    }
    $ingredient_quantity = sprintf(variable_get('recipe_fraction_display', t('{%d} %d&frasl;%d')), $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('/{|}/', '', $ingredient_quantity);
    }
  }
  return filter_xss_admin($ingredient_quantity);
}