%PDF-
%PDF-
Mini Shell
Mini Shell
<?php
/**
* Implements basic page parsing functions.
*
* @link https://ewww.io
* @package EIO
*/
namespace EWWW;
if ( ! defined( 'ABSPATH' ) ) {
exit;
}
/**
* HTML element and attribute parsing, replacing, etc.
*/
class Page_Parser extends Base {
/**
* Allowed image extensions.
*
* @access protected
* @var array $extensions
*/
protected $extensions = array(
'gif',
'jpg',
'jpeg',
'jpe',
'png',
'svg',
'webp',
);
/**
* Indicates if we are filtering ExactDN urls.
*
* @access protected
* @var bool $parsing_exactdn
*/
protected $parsing_exactdn = false;
/**
* List of images that will be preloaded.
*
* @var array $preload_images
*/
public $preload_images = array();
/**
* Match all images and any relevant <a> tags in a block of HTML.
*
* The hyperlinks param implies that the src attribute is required, but not the other way around.
*
* @param string $content Some HTML.
* @param bool $hyperlinks Default true. Should we include encasing hyperlinks in our search.
* @param bool $src_required Default true. Should we look only for images with src attributes.
* @return array An array of $images matches, where $images[0] is
* an array of full matches, and the link_url, img_tag,
* and img_url keys are arrays of those matches.
*/
public function get_images_from_html( $content, $hyperlinks = true, $src_required = true ) {
$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
$images = array();
$unquoted_images = array();
$unquoted_pattern = '';
$search_pattern = '#(?P<img_tag><img\s[^\\\\>]*?>)#is';
if ( $hyperlinks ) {
$this->debug_message( 'using div/figure+hyperlink(a) patterns with src required' );
$search_pattern = '#(?:<div[^>]*?\s+?class\s*=\s*["\'](?P<div_class>[\w\s-]+?)["\'][^>]*?>\s*(?:<span[^>]*?></span>)?)?(?:<figure[^>]*?\s+?class\s*=\s*["\'](?P<figure_class>[\w\s-]+?)["\'][^>]*?>\s*)?(?:<a[^>]*?\s+?href\s*=\s*["\'](?P<link_url>[^\s]+?)["\'][^>]*?>\s*)?(?P<img_tag><img[^>]*?\s+?src\s*=\s*("|\')(?P<img_url>(?!\5)[^\\\\]+?)\5[^>]*?>){1}(?:\s*</a>)?#is';
$unquoted_pattern = '#(?:<div[^>]*?\s+?class\s*=\s*(?P<div_class>[\w-]+?)[^>]*?>\s*(?:<span[^>]*?></span>)?)?(?:<figure[^>]*?\s+?class\s*=\s*(?P<figure_class>[\w-]+?)[^>]*?>\s*)?(?:<a[^>]*?\s+?href\s*=\s*(?P<link_url>[^"\'\\\\<>][^\s<>]+)[^>]*?>\s*)?(?P<img_tag><img[^>]*?\s+?src\s*=\s*(?P<img_url>[^"\'\\\\<>][^\s\\\\<>]+)(?:\s[^>]*?)?>){1}(?:\s*</a>)?#is';
} elseif ( $src_required ) {
$this->debug_message( 'using plain img pattern, src still required' );
$search_pattern = '#(?P<img_tag><img[^>]*?\s+?src\s*=\s*("|\')(?P<img_url>(?!\2)[^\\\\]+?)\2[^>]*?>)#is';
$unquoted_pattern = '#(?P<img_tag><img[^>]*?\s+?src\s*=\s*(?P<img_url>[^"\'\\\\<>][^\s\\\\<>]+)(?:\s[^>]*?)?>)#is';
}
if ( \preg_match_all( $search_pattern, $content, $images ) ) {
$this->debug_message( 'found ' . \count( $images[0] ) . ' image elements with quoted pattern' );
foreach ( $images as $key => $unused ) {
// Simplify the output as much as possible.
if ( \is_numeric( $key ) && $key > 0 ) {
unset( $images[ $key ] );
}
}
/* $this->debug_message( print_r( $images, true ) ); */
}
$images = \array_filter( $images );
if ( $unquoted_pattern && \preg_match_all( $unquoted_pattern, $content, $unquoted_images ) ) {
$this->debug_message( 'found ' . \count( $unquoted_images[0] ) . ' image elements with unquoted pattern' );
foreach ( $unquoted_images as $key => $unused ) {
// Simplify the output as much as possible.
if ( \is_numeric( $key ) && $key > 0 ) {
unset( $unquoted_images[ $key ] );
}
}
/* $this->debug_message( print_r( $unquoted_images, true ) ); */
}
$unquoted_images = \array_filter( $unquoted_images );
if ( ! empty( $images ) && ! empty( $unquoted_images ) ) {
$this->debug_message( 'both patterns found results, merging' );
/* $this->debug_message( print_r( $images, true ) ); */
$images = \array_merge_recursive( $images, $unquoted_images );
/* $this->debug_message( print_r( $images, true ) ); */
if ( ! empty( $images[0] ) && ! empty( $images[1] ) ) {
$images[0] = \array_merge( $images[0], $images[1] );
unset( $images[1] );
}
} elseif ( empty( $images ) && ! empty( $unquoted_images ) ) {
$this->debug_message( 'unquoted results only, subbing in' );
$images = $unquoted_images;
}
/* $this->debug_message( print_r( $images, true ) ); */
return $images;
}
/**
* Match all images wrapped in <noscript> tags in a block of HTML.
*
* @param string $content Some HTML.
* @return array An array of $images matches, where $images[0] is
* an array of full matches, and the noscript_tag, img_tag,
* and img_url keys are arrays of those matches.
*/
public function get_noscript_images_from_html( $content ) {
$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
$images = array();
if ( \preg_match_all( '#(?P<noscript_tag><noscript[^>]*?>\s*)(?P<img_tag><img[^>]*?\s+?src\s*=\s*["\'](?P<img_url>[^\s]+?)["\'][^>]*?>){1}(?:\s*</noscript>)?#is', $content, $images ) ) {
foreach ( $images as $key => $unused ) {
// Simplify the output as much as possible, mostly for confirming test results.
if ( \is_numeric( $key ) && $key > 0 ) {
unset( $images[ $key ] );
}
}
return $images;
}
return array();
}
/**
* Match all sources wrapped in <picture> tags in a block of HTML.
*
* @param string $content Some HTML.
* @return array An array of $pictures matches, containing full elements with ending tags.
*/
public function get_picture_tags_from_html( $content ) {
$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
$pictures = array();
if ( \preg_match_all( '#(?:<picture[^>]*?>\s*)(?:<source[^>]*?>)+(?:.*?</picture>)?#is', $content, $pictures ) ) {
return $pictures[0];
}
return array();
}
/**
* Match all <style> tags in a block of HTML.
*
* @param string $content Some HTML.
* @return array An array of $styles matches, containing full elements with ending tags.
*/
public function get_style_tags_from_html( $content ) {
$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
$styles = array();
if ( \preg_match_all( '#<style[^>]*?>.*?</style>#is', $content, $styles ) ) {
return $styles[0];
}
return array();
}
/**
* Get a list of images that are going to be preloaded.
*
* @param string $content Some HTML.
*/
public function get_preload_images( $content ) {
$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
if ( count( $this->preload_images ) ) {
$this->debug_message( 'already got some' );
return;
}
$links = $this->get_elements_from_html( $content, 'link' );
foreach ( $links as $link ) {
if ( 'preload' === $this->get_attribute( $link, 'rel' ) && 'image' === $this->get_attribute( $link, 'as' ) ) {
$url = $this->get_attribute( $link, 'href' );
if ( $url ) {
$this->debug_message( "found preload for $url" );
$path = $this->parse_url( $url, PHP_URL_PATH );
$srcset = $this->get_attribute( $link, 'imagesrcset' );
if ( $path ) {
$this->debug_message( "parsed it down to $path" );
$this->preload_images[] = array(
'tag' => $link,
'url' => $url,
'path' => $path,
'srcset' => $srcset,
'found' => false,
);
}
}
}
}
}
/**
* Match all elements by tag name in a block of HTML. Does not retrieve contents or closing tags.
*
* @param string $content Some HTML.
* @param string $tag_name The name of the elements to retrieve.
* @return array An array of $elements.
*/
public function get_elements_from_html( $content, $tag_name ) {
$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
if ( ! \ctype_alpha( str_replace( '-', '', $tag_name ) ) ) {
return array();
}
if ( \preg_match_all( '#<' . $tag_name . '\s[^\\\\>]+?>#is', $content, $elements ) ) {
return $elements[0];
}
return array();
}
/**
* Try to determine height and width from strings WP appends to resized image filenames.
*
* @param string $src The image URL.
* @param bool $use_params Check ExactDN image parameters for additional size information. Default to false.
* @return array An array consisting of width and height.
*/
public function get_dimensions_from_filename( $src, $use_params = false ) {
$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
$width_height_string = array();
$this->debug_message( "looking for dimensions in $src" );
$width_param = false;
$height_param = false;
if ( $use_params && \strpos( $src, '?' ) ) {
$url_params = \urldecode( $this->parse_url( $src, PHP_URL_QUERY ) );
if ( $url_params && false !== \strpos( $url_params, 'resize=' ) ) {
\preg_match( '/resize=(\d+),(\d+)/', $url_params, $resize_matches );
if ( \is_array( $resize_matches ) && ! empty( $resize_matches[1] ) && ! empty( $resize_matches[2] ) ) {
$width_param = (int) $resize_matches[1];
$height_param = (int) $resize_matches[2];
}
} elseif ( false !== \strpos( $url_params, 'fit=' ) ) {
\preg_match( '/fit=(\d+),(\d+)/', $url_params, $fit_matches );
if ( \is_array( $fit_matches ) && ! empty( $fit_matches[1] ) && ! empty( $fit_matches[2] ) ) {
$width_param = (int) $fit_matches[1];
$height_param = (int) $fit_matches[2];
}
}
}
if ( \preg_match( '#-(\d+)x(\d+)(@2x)?\.(?:' . \implode( '|', $this->extensions ) . '){1}(?:\?.+)?$#i', $src, $width_height_string ) ) {
$width = (int) $width_height_string[1];
$height = (int) $width_height_string[2];
if ( \strpos( $src, '@2x' ) ) {
$width = 2 * $width;
$height = 2 * $height;
}
if ( $width && $height ) {
if ( $width_param && $width_param < $width ) {
$width = $width_param;
}
if ( $height_param && $height_param < $height ) {
$height = $height_param;
}
$this->debug_message( "found w$width h$height" );
return array( $width, $height );
}
}
return array( $width_param, $height_param ); // These may be false, unless URL parameters were found.
}
/**
* Get dimensions of a file from the URL.
*
* @param string $url The URL of the image.
* @return array The width and height, in pixels.
*/
public function get_image_dimensions_by_url( $url ) {
$this->debug_message( '<b>' . __METHOD__ . '()</b>' );
$this->debug_message( "getting dimensions for $url" );
list( $width, $height ) = $this->get_dimensions_from_filename( $url, ! empty( $this->parsing_exactdn ) );
if ( empty( $width ) || empty( $height ) ) {
// Couldn't get it from the URL directly, see if we can get the actual filename.
$file = false;
if ( $this->allowed_urls && $this->allowed_domains ) {
$file = $this->cdn_to_local( $url );
}
if ( ! $file ) {
$file = $this->url_to_path_exists( $url );
}
if ( $file && $this->is_file( $file ) ) {
list( $width, $height ) = \wp_getimagesize( $file );
}
}
$width = $width && \is_numeric( $width ) ? (int) $width : false;
$height = $height && \is_numeric( $height ) ? (int) $height : false;
return array( $width, $height );
}
/**
* Get the width from an image element.
*
* @param string $img The full image element.
* @return string The width found or an empty string.
*/
public function get_img_style_width( $img ) {
// Check for an inline max-width directive.
$style = $this->get_attribute( $img, 'style' );
if ( $style && \preg_match( '#max-width:\s?(\d+)px#', $style, $max_width_string ) ) {
if ( ! empty( $max_width_string[1] ) && \is_numeric( $max_width_string ) ) {
return (int) $max_width_string[1];
}
} elseif ( $style && \preg_match( '#width:\s?(\d+)px#', $style, $width_string ) ) {
if ( ! empty( $width_string[1] ) && \is_numeric( $width_string[1] ) ) {
return (int) $width_string[1];
}
}
return false;
}
/**
* Get the height from an image element.
*
* @param string $img The full image element.
* @return string The height found or an empty string.
*/
public function get_img_style_height( $img ) {
// Then check for an inline max-height directive.
$style = $this->get_attribute( $img, 'style' );
if ( $style && \preg_match( '#max-height:\s?(\d+)px#', $style, $max_height_string ) ) {
if ( ! empty( $max_height_string[1] ) && \is_numeric( $max_height_string[1] ) ) {
return (int) $max_height_string[1];
}
} elseif ( $style && \preg_match( '#height:\s?(\d+)px#', $style, $height_string ) ) {
if ( ! empty( $height_string[1] ) && \is_numeric( $height_string[1] ) ) {
return (int) $height_string[1];
}
}
return false;
}
/**
* Get an attribute from an HTML element.
*
* @param string $element The HTML element to parse.
* @param string $name The name of the attribute to search for.
* @return string The value of the attribute, or an empty string if not found.
*/
public function get_attribute( $element, $name ) {
// Don't forget, back references cannot be used in character classes.
if ( \preg_match( '#\s' . $name . '\s*=\s*("|\')((?!\1).+?)\1#is', $element, $attr_matches ) ) {
if ( ! empty( $attr_matches[2] ) ) {
return $attr_matches[2];
}
}
// If there were not any matches with quotes, look for unquoted attributes, no spaces or quotes allowed.
if ( \preg_match( '#\s' . $name . '\s*=\s*([^"\'][^\s>]+)#is', $element, $attr_matches ) ) {
if ( ! empty( $attr_matches[1] ) ) {
return $attr_matches[1];
}
}
return '';
}
/**
* Get CSS background-image URLs.
*
* @param string $attribute An element's style attribute. Do not pass a full HTML element.
* @return array An array containing URL(s) from the background/background-image property.
*/
public function get_background_image_urls( $attribute ) {
$urls = array();
if ( ( false !== \strpos( $attribute, 'background:' ) || false !== \strpos( $attribute, 'background-image:' ) ) && false !== \strpos( $attribute, 'url(' ) ) {
if ( \preg_match_all( '#url\((?P<bg_url>[^)]+)\)#', $attribute, $prop_matches ) ) {
if ( $this->is_iterable( $prop_matches['bg_url'] ) ) {
foreach ( $prop_matches['bg_url'] as $url ) {
$urls[] = \trim( \html_entity_decode( $url, ENT_QUOTES | ENT_HTML401 ), "'\"\t\n\r " );
}
}
}
}
return $urls;
}
/**
* Get a single CSS background-image URL. For backwords compat.
*
* @param string $attribute An element's style attribute. Do not pass a full HTML element.
* @return array An array containing URL(s) from the background/background-image property.
*/
public function get_background_image_url( $attribute ) {
if ( ( false !== \strpos( $attribute, 'background:' ) || false !== \strpos( $attribute, 'background-image:' ) ) && false !== \strpos( $attribute, 'url(' ) ) {
$background_urls = $this->get_background_image_urls( $attribute );
if ( ! empty( $background_urls[0] ) ) {
return $background_urls[0];
}
}
return '';
}
/**
* Get CSS background-image rules from HTML.
*
* @param string $html The code containing potential background images.
* @return array The URLs with background/background-image properties.
*/
public function get_background_images( $html ) {
if ( ( false !== \strpos( $html, 'background:' ) || false !== \strpos( $html, 'background-image:' ) ) && false !== \strpos( $html, 'url(' ) ) {
if ( \preg_match_all( '#background(-image)?:\s*?[^;}]*?url\([^)]+\)#', $html, $matches ) ) {
return $matches[0];
}
}
return array();
}
/**
* Set an attribute on an HTML element.
*
* @param string $element The HTML element to modify. Passed by reference.
* @param string $name The name of the attribute to set.
* @param string $value The value of the attribute to set.
* @param bool $replace Default false. True to replace, false to append.
*/
public function set_attribute( &$element, $name, $value, $replace = false ) {
if ( 'class' === $name ) {
$element = \preg_replace( "#\s$name\s+([^=])#", ' $1', $element );
}
// Remove empty attributes first.
$element = \preg_replace( "#\s$name=\"\"#", ' ', $element );
// Remove/escape double-quotes with the encoded version, so that we can safely enclose the value in double-quotes.
$value = \str_replace( '"', '"', $value );
$value = \trim( $value );
if ( $replace ) {
// Don't forget, back references cannot be used in character classes.
$new_element = \preg_replace( '#\s' . $name . '\s*=\s*("|\')(?!\1).*?\1#is', ' ' . $name . '="' . $value . '"', $element );
if ( \strpos( $new_element, "$name=" ) && $new_element !== $element ) {
$element = $new_element;
return;
}
// Purge un-quoted attribute patterns, so the new value can be inserted further down.
$new_element = \preg_replace( '#\s' . $name . '\s*=\s*[^"\'][^\s>]+#is', ' ', $element );
// But if we couldn't purge the attribute, then bail out.
if ( \preg_match( '#\s' . $name . '\s*=\s*#', $new_element ) && $new_element === $element ) {
$this->debug_message( "$name replacement failed, still exists in $element" );
return;
}
$element = $new_element;
}
$closing = ' />';
if ( false === \strpos( $element, '/>' ) ) {
$closing = '>';
}
if ( false === \strpos( $value, '"' ) ) { // This should always be true, since we escape double-quotes above.
$element = \rtrim( $element, $closing ) . " $name=\"$value\"$closing";
return;
}
// If we get here, something is kind of weird, since double-quotes were supposed to be escaped.
$element = \rtrim( $element, $closing ) . " $name='$value'$closing";
}
/**
* Remove an attribute from an HTML element.
*
* @param string $element The HTML element to modify. Passed by reference.
* @param string $name The name of the attribute to remove.
*/
public function remove_attribute( &$element, $name ) {
// Don't forget, back references cannot be used in character classes.
$element = \preg_replace( '#\s' . $name . '\s*=\s*("|\')(?!\1).+?\1#is', ' ', $element );
$element = \preg_replace( '#\s' . $name . '\s*=\s*[^"\'][^\s>]+#is', ' ', $element );
}
/**
* Remove the background image URL from a style attribute.
*
* @param string $attribute The element's style attribute to modify.
* @return string The style attribute with any image url removed.
*/
public function remove_background_image( $attribute ) {
if ( false !== \strpos( $attribute, 'background:' ) && false !== \strpos( $attribute, 'url(' ) ) {
$new_attribute = \preg_replace( '#\s?url\([^)]+\)#', '', $attribute );
if ( $new_attribute !== $attribute ) {
return $new_attribute;
}
}
if ( false !== \strpos( $attribute, 'background-image:' ) && false !== \strpos( $attribute, 'url(' ) ) {
$new_attribute = \preg_replace( '#background-image:\s*(,?\s*url\([^)]+\))+;?\s*#', '', $attribute );
if ( $new_attribute !== $attribute ) {
$new_attribute = \preg_replace( '#background-image:\s*;?\s*$#', '', $new_attribute );
return $new_attribute;
}
}
if ( false !== \strpos( $attribute, 'background-image:' ) && false !== \strpos( $attribute, 'url(' ) ) {
$new_attribute = \preg_replace( '#,?\s*url\([^)]+\)#', '', $attribute );
if ( $new_attribute !== $attribute ) {
$new_attribute = \preg_replace( '#background-image:\s*;?\s*$#', '', $new_attribute );
return $new_attribute;
}
}
return $attribute;
}
}
Zerion Mini Shell 1.0