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drupal_parse_dependency

7 common.inc drupal_parse_dependency($dependency)

Parse a dependency for comparison by drupal_check_incompatibility().

Parameters

$dependency: A dependency string, for example 'foo (>=7.x-4.5-beta5, 3.x)'.

Return value

An associative array with three keys:

  • 'name' includes the name of the thing to depend on (e.g. 'foo').
  • 'original_version' contains the original version string (which can be used in the UI for reporting incompatibilities).
  • 'versions' is a list of associative arrays, each containing the keys 'op' and 'version'. 'op' can be one of: '=', '==', '!=', '<>', '<', '<=', '>', or '>='. 'version' is one piece like '4.5-beta3'.

Callers should pass this structure to drupal_check_incompatibility().

See also

drupal_check_incompatibility()

1 call to drupal_parse_dependency()

File

drupal/includes/common.inc, line 7205
Common functions that many Drupal modules will need to reference.

Code

function drupal_parse_dependency($dependency) {
  // We use named subpatterns and support every op that version_compare
  // supports. Also, op is optional and defaults to equals.
  $p_op = '(?P<operation>!=|==|=|<|<=|>|>=|<>)?';
  // Core version is always optional: 7.x-2.x and 2.x is treated the same.
  $p_core = '(?:' . preg_quote(DRUPAL_CORE_COMPATIBILITY) . '-)?';
  $p_major = '(?P<major>\d+)';
  // By setting the minor version to x, branches can be matched.
  $p_minor = '(?P<minor>(?:\d+|x)(?:-[A-Za-z]+\d+)?)';
  $value = array();
  $parts = explode('(', $dependency, 2);
  $value['name'] = trim($parts[0]);
  if (isset($parts[1])) {
    $value['original_version'] = ' (' . $parts[1];
    foreach (explode(',', $parts[1]) as $version) {
      if (preg_match("/^\s*$p_op\s*$p_core$p_major\.$p_minor/", $version, $matches)) {
        $op = !empty($matches['operation']) ? $matches['operation'] : '=';
        if ($matches['minor'] == 'x') {
          // Drupal considers "2.x" to mean any version that begins with
          // "2" (e.g. 2.0, 2.9 are all "2.x"). PHP's version_compare(),
          // on the other hand, treats "x" as a string; so to
          // version_compare(), "2.x" is considered less than 2.0. This
          // means that >=2.x and <2.x are handled by version_compare()
          // as we need, but > and <= are not.
          if ($op == '>' || $op == '<=') {
            $matches['major']++;
          }
          // Equivalence can be checked by adding two restrictions.
          if ($op == '=' || $op == '==') {
            $value['versions'][] = array(
              'op' => '<',
              'version' => ($matches['major'] + 1) . '.x',
            );
            $op = '>=';
          }
        }
        $value['versions'][] = array(
          'op' => $op,
          'version' => $matches['major'] . '.' . $matches['minor'],
        );
      }
    }
  }
  return $value;
}