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<?php
namespace AmpProject\Optimizer;
/**
* Collection of CSS rules.
*
* This is used in conjunction with CssRule for deduplication of CSS when adding styles during transformations.
*
* Note: This is a simplistic representation of CSS rules built for a specific purpose.
* Make sure it supports a given use case before including in new code!
*
* @package ampproject/optimizer
*/
final class CssRules
{
/**
* Internal array of CssRule objects.
*
* @var CssRule[]
*/
private $cssRules = [];
/**
* Rendered CSS cache.
*
* @var string|null
*/
private $renderedCss;
/**
* Byte count cache.
*
* @var int|null
*/
private $byteCount;
/**
* Create a new CssRules collection from an array of CssRule objects.
*
* @param CssRule[] $cssRuleArray Array of CssRule objects.
* @return CssRules CSS rules collection.
*/
public static function fromCssRuleArray($cssRuleArray)
{
$cssRules = new self();
array_walk(
$cssRuleArray,
static function (CssRule $cssRule) use (&$cssRules) {
$cssRules = $cssRules->add($cssRule);
}
);
return $cssRules;
}
/**
* Add a CSS rule to the collection.
*
* @param CssRule $cssRule
* @return CssRules Adapted collection with the added CSS rule.
*/
public function add(CssRule $cssRule)
{
$clone = clone $this;
if (empty($clone->cssRules)) {
$clone->cssRules = [$cssRule];
return $clone;
}
foreach ($clone->cssRules as $index => $existingCssRule) {
if ($existingCssRule->canBeMerged($cssRule)) {
$clone->cssRules[$index] = $existingCssRule->mergeWith($cssRule);
// Rendered CSS and byte count need to be rebuilt, as some previously rendered CSS rule has changed.
$clone->renderedCss = null;
$clone->byteCount = null;
return $clone;
}
}
$clone->cssRules[] = $cssRule;
if ($clone->renderedCss !== null) {
// As we didn't merge, we can save rerendering and just concat the single rule.
$clone->renderedCss .= $cssRule->getCss();
}
if ($clone->byteCount !== null) {
// As we didn't merge, we can save recounting and just add the bytes of the single rule.
$clone->byteCount += $cssRule->getByteCount();
}
return $clone;
}
/**
* Get the CSS for the entire collection of CSS rules.
*
* @return string String representation of the collection of CSS rules.
*/
public function getCss()
{
if ($this->renderedCss === null) {
$this->renderedCss = array_reduce(
$this->cssRules,
static function ($css, CssRule $cssRule) {
return $css . $cssRule->getCss();
},
''
);
}
return $this->renderedCss;
}
/**
* Get the byte count for the entire collection of CSS rules.
*
* @return int Byte count of the collection of CSS rules.
*/
public function getByteCount()
{
if ($this->byteCount === null) {
$this->byteCount = array_reduce(
$this->cssRules,
static function ($byteCount, CssRule $cssRule) {
return $byteCount + $cssRule->getByteCount();
},
0
);
}
return $this->byteCount;
}
}
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