function csstidy_optimise::merge_bg in Advanced CSS/JS Aggregation 6

Same name and namespace in other branches

1. 7 advagg_css_compress/csstidy/class.csstidy_optimise.inc \csstidy_optimise::merge_bg()

Merges all background properties

@version 1.0 @todo full CSS 3 compliance

Parameters

array $input_css:

Return value

array

See also

dissolve_short_bg()

1 call to csstidy_optimise::merge_bg()

csstidy_optimise::postparse in advagg_css_compress/csstidy/class.csstidy_optimise.inc

Optimises $css after parsing @access public @version 1.0

File

advagg_css_compress/csstidy/class.csstidy_optimise.inc, line 759

Class

csstidy_optimise

CSS Optimising Class

Code

function merge_bg($input_css) {
  $background_prop_default =& $GLOBALS['csstidy']['background_prop_default'];

  // Max number of background images. CSS3 not yet fully implemented
  $number_of_values = @max(count(csstidy_optimise::explode_ws(',', $input_css['background-image'])), count(csstidy_optimise::explode_ws(',', $input_css['background-color'])), 1);

  // Array with background images to check if BG image exists
  $bg_img_array = @csstidy_optimise::explode_ws(',', csstidy::gvw_important($input_css['background-image']));
  $new_bg_value = '';
  $important = '';

  // if background properties is here and not empty, don't try anything
  if (isset($input_css['background']) and $input_css['background']) {
    return $input_css;
  }
  for ($i = 0; $i < $number_of_values; $i++) {
    foreach ($background_prop_default as $bg_property => $default_value) {

      // Skip if property does not exist
      if (!isset($input_css[$bg_property])) {
        continue;
      }
      $cur_value = $input_css[$bg_property];

      // skip all optimisation if gradient() somewhere
      if (stripos($cur_value, "gradient(") !== FALSE) {
        return $input_css;
      }

      // Skip some properties if there is no background image
      if ((!isset($bg_img_array[$i]) || $bg_img_array[$i] === 'none') && ($bg_property === 'background-size' || $bg_property === 'background-position' || $bg_property === 'background-attachment' || $bg_property === 'background-repeat')) {
        continue;
      }

      // Remove !important
      if (csstidy::is_important($cur_value)) {
        $important = ' !important';
        $cur_value = csstidy::gvw_important($cur_value);
      }

      // Do not add default values
      if ($cur_value === $default_value) {
        continue;
      }
      $temp = csstidy_optimise::explode_ws(',', $cur_value);
      if (isset($temp[$i])) {
        if ($bg_property === 'background-size') {
          $new_bg_value .= '(' . $temp[$i] . ') ';
        }
        else {
          $new_bg_value .= $temp[$i] . ' ';
        }
      }
    }
    $new_bg_value = trim($new_bg_value);
    if ($i != $number_of_values - 1) {
      $new_bg_value .= ',';
    }
  }

  // Delete all background-properties
  foreach ($background_prop_default as $bg_property => $default_value) {
    unset($input_css[$bg_property]);
  }

  // Add new background property
  if ($new_bg_value !== '') {
    $input_css['background'] = $new_bg_value . $important;
  }
  elseif (isset($input_css['background'])) {
    $input_css['background'] = 'none';
  }
  return $input_css;
}