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<?php |
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namespace ArjanSchouten\HtmlMinifier\Minifiers\Html; |
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use ArjanSchouten\HtmlMinifier\Constants; |
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use ArjanSchouten\HtmlMinifier\Minifiers\MinifierInterface; |
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use ArjanSchouten\HtmlMinifier\MinifyContext; |
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use ArjanSchouten\HtmlMinifier\Options; |
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class WhitespaceMinifier implements MinifierInterface |
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{ |
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/** |
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* Max allowed html line length for old e.g. browsers, firewalls and routers. |
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* |
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* @var int |
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*/ |
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protected $maxHtmlLineLength = 32000; |
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/** |
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* Minification regexp's for replacing redundant whitespaces. |
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* |
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* @var array |
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*/ |
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protected $minifyRules = [ |
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'/\s?=\s?/' => '=', |
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'/\s?\/>/' => '>', |
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'/>\s</' => '><', |
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'/\s\s/' => ' ', |
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'/<\s/' => '<', |
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'/\s>/' => '>', |
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'/\t/' => ' ', |
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'/\r/' => '', |
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'/\n/' => '', |
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]; |
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/** |
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* Minify redundant whitespaces. |
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* |
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* @param \ArjanSchouten\HtmlMinifier\MinifyContext $context |
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* |
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* @return \ArjanSchouten\HtmlMinifier\MinifyContext |
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*/ |
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public function process(MinifyContext $context) |
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{ |
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$context->setContents($this->trailingWhitespaces($context->getContents())); |
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$context->setContents($this->runMinificationRules($context->getContents())); |
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$context->setContents($this->removeSpacesAroundPlaceholders($context->getContents())); |
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return $context->setContents($this->maxHtmlLineLength($context->getContents(), $this->maxHtmlLineLength)); |
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} |
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/** |
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* Remove trailing whitespaces around the contents. |
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* |
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* @param string $contents |
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* |
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* @return string |
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*/ |
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public function trailingWhitespaces($contents) |
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{ |
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return trim($contents); |
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} |
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/** |
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* Loop over the minification rules as long as changes in output occur. |
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* |
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* @param string $contents |
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* |
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* @return string |
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*/ |
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public function runMinificationRules($contents) |
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{ |
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do { |
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$originalContents = $contents; |
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$contents = preg_replace(array_keys($this->minifyRules), array_values($this->minifyRules), $contents); |
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} while ($originalContents != $contents); |
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return $contents; |
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} |
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/** |
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* Remove all spaces around placeholders. |
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* |
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* @param string $contents |
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* |
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* @return string |
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*/ |
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public function removeSpacesAroundPlaceholders($contents) |
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{ |
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return preg_replace('/\s*('.Constants::PLACEHOLDER_PATTERN.')\s*/', '$1', $contents); |
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} |
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/** |
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* Old browsers, firewalls and more can't handle to long lines. |
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* Therefore add a linebreak after specified character length. |
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* |
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* @param int $maxHtmlLineLength |
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* @param string $contents |
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* |
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* @return string |
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*/ |
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public function maxHtmlLineLength($contents, $maxHtmlLineLength) |
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{ |
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if (strlen($contents) <= $maxHtmlLineLength) { |
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return $contents; |
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} |
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$result = ''; |
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$splits = str_split($contents, $maxHtmlLineLength); |
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foreach ($splits as $split) { |
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$pos = strrpos($split, '><'); |
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if ($pos === false) { |
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$result .= $split; |
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} else { |
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$result .= substr_replace($split, PHP_EOL, $pos + 1, 0); |
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} |
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} |
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return $result; |
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} |
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/** |
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* Indicates if minification rules depends on command options. |
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* |
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* @return string |
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*/ |
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public function provides() |
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{ |
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return Options::WHITESPACES; |
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} |
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} |
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ArjanSchouten /
HtmlMinifier
