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<?php |
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namespace ArjanSchouten\HtmlMinifier\Placeholders; |
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use ArjanSchouten\HtmlMinifier\PlaceholderContainer; |
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class CommentPlaceholder implements PlaceholderInterface |
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{ |
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/** |
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* Replace critical content with a temp placeholder for integrity. |
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* |
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* @param \ArjanSchouten\HtmlMinifier\MinifyContext $context |
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* |
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* @return \ArjanSchouten\HtmlMinifier\MinifyContext |
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*/ |
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public function process($context) |
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{ |
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$context->setContents($this->setCDataPlaceholder($context->getContents(), $context->getPlaceholderContainer())); |
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return $context->setContents($this->setConditionalCommentsPlaceholder($context->getContents(), $context->getPlaceholderContainer())); |
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} |
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/** |
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* Replace CData with a temporary placeholder. |
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* |
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* @param string $contents |
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* @param \ArjanSchouten\HtmlMinifier\PlaceholderContainer $placeholderContainer |
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* |
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* @return string |
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*/ |
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protected function setCDataPlaceholder($contents, PlaceholderContainer $placeholderContainer) |
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{ |
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return preg_replace_callback('/<!\[CDATA\[((?!\]\]>).)*\]\]>/s', function ($match) use ($placeholderContainer) { |
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return $placeholderContainer->createPlaceholder($match[0]); |
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}, $contents); |
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} |
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/** |
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* Replace conditional placeholders used by Internet Explorer. |
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* |
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* @param string $contents |
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* @param \ArjanSchouten\HtmlMinifier\PlaceholderContainer $placeholderContainer |
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* |
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* @return string |
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*/ |
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protected function setConditionalCommentsPlaceholder($contents, PlaceholderContainer $placeholderContainer) |
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{ |
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return preg_replace_callback( |
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'/ |
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( |
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<! # Match the start of a comment |
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(-{2})? # IE can understand comments without dashes |
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\[ # Match the start ("[" is a metachar => escape it) |
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(?:(?!\]>).)* # Match everything except "]>" |
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\]> # Match end |
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) |
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( |
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(?: |
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(?!<!\[endif\]-{2}?>) |
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.)* |
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) # Match everything except end of conditional comment |
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( |
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<!\[endif\] |
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(?:\2|(?=>)) # Use a trick to ensure that when dashes are captured they are... |
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# matched at the end! Else make sure that the next char is a ">"! |
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> # Match the endif with the captured dashes |
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) |
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/xis', |
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function ($match) use ($placeholderContainer) { |
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if (!empty(preg_replace('/\s*/', '', $match[3]))) { |
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return $placeholderContainer->createPlaceholder($match[1]).$match[3].$placeholderContainer->createPlaceholder($match[4]); |
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} else { |
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return ''; |
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} |
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}, $contents); |
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} |
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} |
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ArjanSchouten /
HtmlMinifier
