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<?php
declare(strict_types=1);
namespace WP_Rocket\Engine\Optimization;
trait RegexTrait {
/**
* Array of replaced xmp tags
*
* @var array
*/
private $xmp_replace = [];
/**
* Array of replaced html tags.
*
* @var array
*/
private $html_replace = [];
/**
* Array of replaced svg tags
*
* @var array
*/
private $svg_replace = [];
/**
* Finds nodes matching the pattern in the HTML.
*
* @param string $pattern Pattern to match.
* @param string $html HTML content.
* @param string $modifiers Regex modifiers.
* @param mixed $flag Flag to use.
* @return array
*/
protected function find( string $pattern, string $html, string $modifiers = 'Umsi', $flag = PREG_SET_ORDER ) {
preg_match_all( '/' . $pattern . '/' . $modifiers, $html, $matches, $flag );
if ( empty( $matches ) ) {
return [];
}
return $matches;
}
/**
* Hides unwanted blocks from the HTML to be parsed for optimization
*
* @since 3.1.4
*
* @param string $html HTML content.
* @return string
*/
protected function hide_comments( $html ) {
$replace = preg_replace( '#<!--\s*noptimize\s*-->.*?<!--\s*/\s*noptimize\s*-->#is', '', $html );
if ( null === $replace ) {
return $html;
}
$replace = preg_replace( '/<!--(.*)-->/Uis', '', $replace );
if ( null === $replace ) {
return $html;
}
return $replace;
}
/**
* Hides scripts from the HTML to be parsed when removing CSS from it
*
* @since 3.10.2
*
* @param string $html HTML content.
*
* @return string
*/
protected function hide_scripts( $html ) {
$replace = preg_replace( '#<script[^>]*>.*?<\/script\s*>#mis', '', $html );
if ( null === $replace ) {
return $html;
}
return $replace;
}
/**
* Hides <noscript> blocks from the HTML to be parsed.
*
* @param string $html HTML content.
*
* @return string
*/
protected function hide_noscripts( $html ) {
$replace = preg_replace( '#<noscript[^>]*>.*?<\/noscript\s*>#mis', '', $html );
if ( null === $replace ) {
return $html;
}
return $replace;
}
/**
* Replace HTML comments.
*
* @param string $html HTML content.
*
* @return string
*/
protected function replace_html_comments( string $html ): string {
$this->html_replace = [];
$regex = '#<!--.*-->#iUs';
$replaced_html = preg_replace_callback( $regex, [ $this, 'replace_html_comment' ], $html );
if ( empty( $replaced_html ) ) {
return $html;
}
return $replaced_html;
}
/**
* Replace html with comment
*
* @param array $match HTML comment.
* @return string
*/
protected function replace_html_comment( $match ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.matchFound
$key = sprintf( '<!-- %s -->', uniqid( 'WPR_HTML_COMMENT_' ) );
$this->html_replace[ $key ] = $match[0];
return $key;
}
/**
* Restore html with comment
*
* @param string $html HTML content.
* @return string
*/
protected function restore_html_comments( $html ) {
if ( empty( $this->html_replace ) ) {
return $html;
}
return str_replace( array_keys( $this->html_replace ), array_values( $this->html_replace ), $html );
}
/**
* Replace <xmp> tags in the HTML with comment
*
* @since 3.12.3
*
* @param string $html HTML content.
* @return string
*/
protected function replace_xmp_tags( $html ) {
$this->xmp_replace = [];
$regex = '#<xmp.*>.*</xmp>#Uis';
$replaced_html = preg_replace_callback( $regex, [ $this, 'replace_xmp' ], $html );
if ( empty( $replaced_html ) ) {
return $html;
}
return $replaced_html;
}
/**
* Replace <svg> tags in the HTML with comment
*
* @since 3.12.5.3
*
* @param string $html HTML content.
* @return string
*/
protected function replace_svg_tags( $html ) {
$this->svg_replace = [];
$regex = '#<\s*svg.*>.*<\s*\\\\?/\s*svg\s*>#Uis';
$replaced_html = preg_replace_callback( $regex, [ $this, 'replace_svg' ], $html );
if ( empty( $replaced_html ) ) {
return $html;
}
return $replaced_html;
}
/**
* Replace svg with comment
*
* @since 3.12.3
*
* @param array $match svg tag.
* @return string
*/
protected function replace_svg( $match ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.matchFound
$key = sprintf( '<!-- %s -->', uniqid( 'WPR_SVG_' ) );
$this->svg_replace[ $key ] = $match[0];
return $key;
}
/**
* Replace xmp with comment
*
* @since 3.12.3
*
* @param array $match xmp tag.
* @return string
*/
protected function replace_xmp( $match ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.matchFound
$key = sprintf( '<!-- %s -->', uniqid( 'WPR_XMP_' ) );
$this->xmp_replace[ $key ] = $match[0];
return $key;
}
/**
* Restore <svg> tags
*
* @since 3.12.5.3
*
* @param string $html HTML content.
* @return string
*/
protected function restore_svg_tags( $html ) {
if ( empty( $this->svg_replace ) ) {
return $html;
}
return str_replace( array_keys( $this->svg_replace ), array_values( $this->svg_replace ), $html );
}
/**
* Restore <xmp> tags
*
* @since 3.12.3
*
* @param string $html HTML content.
* @return string
*/
protected function restore_xmp_tags( $html ) {
if ( empty( $this->xmp_replace ) ) {
return $html;
}
return str_replace( array_keys( $this->xmp_replace ), array_values( $this->xmp_replace ), $html );
}
/**
* Checks if the page HTML is valid or not.
* Valid here means that it has a closing title tag.
*
* @param string $html Page HTML.
*
* @return bool
*/
private function html_has_title_tag( string $html ) {
return (bool) preg_match( '#</title>#iU', $html );
}
}
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