private function CSSmin::shortenZeroValues in Advanced CSS/JS Aggregation 7.2

Shortens all zero values for a set of safe properties e.g. padding: 0px 1px; -> padding:0 1px e.g. padding: 0px 0rem 0em 0.0pc; -> padding:0

Parameters

string $css:

Return value

string

1 call to CSSmin::shortenZeroValues()

CSSmin::minify in advagg_css_compress/yui/CSSMin.inc

Minifies the given input CSS string

File

advagg_css_compress/yui/CSSMin.inc, line 644

Class

CSSmin

Code

private function shortenZeroValues($css) {
  $unitsGroupReg = $this->unitsGroupRegex;
  $numOrPosReg = '(' . $this->numRegex . '|top|left|bottom|right|center)';
  $oneZeroSafeProperties = array(
    '(?:line-)?height',
    '(?:(?:min|max)-)?width',
    'top',
    'left',
    'background-position',
    'bottom',
    'right',
    'border(?:-(?:top|left|bottom|right))?(?:-width)?',
    'border-(?:(?:top|bottom)-(?:left|right)-)?radius',
    'column-(?:gap|width)',
    'margin(?:-(?:top|left|bottom|right))?',
    'outline-width',
    'padding(?:-(?:top|left|bottom|right))?',
  );
  $nZeroSafeProperties = array(
    'margin',
    'padding',
    'background-position',
  );
  $regStart = '/(;|\\{)';
  $regEnd = '/i';

  // First zero regex start
  $oneZeroRegStart = $regStart . '(' . implode('|', $oneZeroSafeProperties) . '):';

  // Multiple zeros regex start
  $nZerosRegStart = $regStart . '(' . implode('|', $nZeroSafeProperties) . '):';
  $css = preg_replace(array(
    $oneZeroRegStart . '0' . $unitsGroupReg . $regEnd,
    $nZerosRegStart . $numOrPosReg . ' 0' . $unitsGroupReg . $regEnd,
    $nZerosRegStart . $numOrPosReg . ' ' . $numOrPosReg . ' 0' . $unitsGroupReg . $regEnd,
    $nZerosRegStart . $numOrPosReg . ' ' . $numOrPosReg . ' ' . $numOrPosReg . ' 0' . $unitsGroupReg . $regEnd,
  ), array(
    '$1$2:0',
    '$1$2:$3 0',
    '$1$2:$3 $4 0',
    '$1$2:$3 $4 $5 0',
  ), $css);

  // Remove background-position
  array_pop($nZeroSafeProperties);

  // Replace 0 0; or 0 0 0; or 0 0 0 0; with 0 for safe properties only.
  $css = preg_replace('/(' . implode('|', $nZeroSafeProperties) . '):0(?: 0){1,3}(;|\\}| !)' . $regEnd, '$1:0$2', $css);

  // Replace 0 0 0; or 0 0 0 0; with 0 0 for background-position property.
  $css = preg_replace('/(background-position):0(?: 0){2,3}(;|\\}| !)' . $regEnd, '$1:0 0$2', $css);
  return $css;
}