]+>)~i',
array( $this, 'tag_script' ),
$buffer
);
if ( ! empty( $this->preload_url ) ) {
$preload_html = '';
$buffer = preg_replace(
'~]*)*>~Ui',
'\\0' . $preload_html,
$buffer,
1
);
add_filter( 'w3tc_lazyload_on_initialized_javascript', array( $this, 'w3tc_lazyload_on_initialized_javascript' ) );
}
$data['buffer'] = $buffer;
$data['modified'] |= ! empty( $this->preload_url );
return $data;
}
/**
* Processes a script tag to identify and handle specific Google Maps scripts.
*
* Examines the script tag to check if it matches the Google Maps Easy plugin's
* frontend script. If a match is found, it updates `$preload_url` and removes
* the tag from the buffer.
*
* @param array $m {
* Matches from the regular expression applied to the buffer.
*
* @type string $0 The full matched script tag.
* }
*
* @return string The modified or original script tag.
*/
public function tag_script( $m ) {
$script_tag = $m[0];
if (
! preg_match(
'~]*src=["\']?([^"\'> ]+)["\'> ]~is',
$script_tag,
$match
)
) {
return $script_tag;
}
$script_src = $match[1];
$script_src = Util_Environment::url_relative_to_full( $script_src );
if ( ! $this->starts_with( $script_src, WP_PLUGIN_URL . '/google-maps-easy/modules/gmap/js/frontend.gmap.js' ) ) {
return $script_tag;
}
$this->preload_url = $script_src;
return '';
}
/**
* Checks if a string starts with a given prefix.
*
* Utility function to determine if the provided string begins with the specified prefix.
*
* @param string $v The string to check.
* @param string $prefix The prefix to look for.
*
* @return bool True if the string starts with the prefix, false otherwise.
*/
private function starts_with( $v, $prefix ) {
return substr( $v, 0, strlen( $prefix ) ) === $prefix;
}
/**
* Generates the JavaScript initialization code for lazy loading Google Maps.
*
* This method returns the JavaScript code that initializes lazy loading for Google Maps
* using the LazyLoad library. It includes a callback to dynamically load the required script
* when the map element enters the viewport.
*
* @return string The JavaScript code for initializing lazy loading.
*/
public function w3tc_lazyload_on_initialized_javascript() {
return 'window.w3tc_lazyLazy_googlemaps_wpmaps = new LazyLoad({' .
'elements_selector: ".gmp_map_opts",' .
'callback_enter: function(e){' .
// w3tc_load_js function.
'function w3tc_load_js(t,n){"use strict";var o=document.getElementsByTagName("script")[0],r=document.createElement("script");return r.src=t,r.async=!0,o.parentNode.insertBefore(r,o),n&&"function"==typeof n&&(r.onload=n),r};' .
'w3tc_load_js("' . esc_url( $this->preload_url ) . '");' .
'}});';
}
}