From a415c29efee45520ae252d2aa28f1083a521cd7b Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Wed, 17 Apr 2024 09:56:49 +0200
Subject: Adding upstream version 6.4.3+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 wp-includes/shortcodes.php | 762 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 762 insertions(+)
 create mode 100644 wp-includes/shortcodes.php

(limited to 'wp-includes/shortcodes.php')

diff --git a/wp-includes/shortcodes.php b/wp-includes/shortcodes.php
new file mode 100644
index 0000000..24df21d
--- /dev/null
+++ b/wp-includes/shortcodes.php
@@ -0,0 +1,762 @@
+<?php
+/**
+ * WordPress API for creating bbcode-like tags or what WordPress calls
+ * "shortcodes". The tag and attribute parsing or regular expression code is
+ * based on the Textpattern tag parser.
+ *
+ * A few examples are below:
+ *
+ * [shortcode /]
+ * [shortcode foo="bar" baz="bing" /]
+ * [shortcode foo="bar"]content[/shortcode]
+ *
+ * Shortcode tags support attributes and enclosed content, but does not entirely
+ * support inline shortcodes in other shortcodes. You will have to call the
+ * shortcode parser in your function to account for that.
+ *
+ * {@internal
+ * Please be aware that the above note was made during the beta of WordPress 2.6
+ * and in the future may not be accurate. Please update the note when it is no
+ * longer the case.}}
+ *
+ * To apply shortcode tags to content:
+ *
+ *     $out = do_shortcode( $content );
+ *
+ * @link https://developer.wordpress.org/plugins/shortcodes/
+ *
+ * @package WordPress
+ * @subpackage Shortcodes
+ * @since 2.5.0
+ */
+
+/**
+ * Container for storing shortcode tags and their hook to call for the shortcode.
+ *
+ * @since 2.5.0
+ *
+ * @name $shortcode_tags
+ * @var array
+ * @global array $shortcode_tags
+ */
+$shortcode_tags = array();
+
+/**
+ * Adds a new shortcode.
+ *
+ * Care should be taken through prefixing or other means to ensure that the
+ * shortcode tag being added is unique and will not conflict with other,
+ * already-added shortcode tags. In the event of a duplicated tag, the tag
+ * loaded last will take precedence.
+ *
+ * @since 2.5.0
+ *
+ * @global array $shortcode_tags
+ *
+ * @param string   $tag      Shortcode tag to be searched in post content.
+ * @param callable $callback The callback function to run when the shortcode is found.
+ *                           Every shortcode callback is passed three parameters by default,
+ *                           including an array of attributes (`$atts`), the shortcode content
+ *                           or null if not set (`$content`), and finally the shortcode tag
+ *                           itself (`$shortcode_tag`), in that order.
+ */
+function add_shortcode( $tag, $callback ) {
+	global $shortcode_tags;
+
+	if ( '' === trim( $tag ) ) {
+		_doing_it_wrong(
+			__FUNCTION__,
+			__( 'Invalid shortcode name: Empty name given.' ),
+			'4.4.0'
+		);
+		return;
+	}
+
+	if ( 0 !== preg_match( '@[<>&/\[\]\x00-\x20=]@', $tag ) ) {
+		_doing_it_wrong(
+			__FUNCTION__,
+			sprintf(
+				/* translators: 1: Shortcode name, 2: Space-separated list of reserved characters. */
+				__( 'Invalid shortcode name: %1$s. Do not use spaces or reserved characters: %2$s' ),
+				$tag,
+				'& / < > [ ] ='
+			),
+			'4.4.0'
+		);
+		return;
+	}
+
+	$shortcode_tags[ $tag ] = $callback;
+}
+
+/**
+ * Removes hook for shortcode.
+ *
+ * @since 2.5.0
+ *
+ * @global array $shortcode_tags
+ *
+ * @param string $tag Shortcode tag to remove hook for.
+ */
+function remove_shortcode( $tag ) {
+	global $shortcode_tags;
+
+	unset( $shortcode_tags[ $tag ] );
+}
+
+/**
+ * Clears all shortcodes.
+ *
+ * This function clears all of the shortcode tags by replacing the shortcodes global with
+ * an empty array. This is actually an efficient method for removing all shortcodes.
+ *
+ * @since 2.5.0
+ *
+ * @global array $shortcode_tags
+ */
+function remove_all_shortcodes() {
+	global $shortcode_tags;
+
+	$shortcode_tags = array();
+}
+
+/**
+ * Determines whether a registered shortcode exists named $tag.
+ *
+ * @since 3.6.0
+ *
+ * @global array $shortcode_tags List of shortcode tags and their callback hooks.
+ *
+ * @param string $tag Shortcode tag to check.
+ * @return bool Whether the given shortcode exists.
+ */
+function shortcode_exists( $tag ) {
+	global $shortcode_tags;
+	return array_key_exists( $tag, $shortcode_tags );
+}
+
+/**
+ * Determines whether the passed content contains the specified shortcode.
+ *
+ * @since 3.6.0
+ *
+ * @global array $shortcode_tags
+ *
+ * @param string $content Content to search for shortcodes.
+ * @param string $tag     Shortcode tag to check.
+ * @return bool Whether the passed content contains the given shortcode.
+ */
+function has_shortcode( $content, $tag ) {
+	if ( ! str_contains( $content, '[' ) ) {
+		return false;
+	}
+
+	if ( shortcode_exists( $tag ) ) {
+		preg_match_all( '/' . get_shortcode_regex() . '/', $content, $matches, PREG_SET_ORDER );
+		if ( empty( $matches ) ) {
+			return false;
+		}
+
+		foreach ( $matches as $shortcode ) {
+			if ( $tag === $shortcode[2] ) {
+				return true;
+			} elseif ( ! empty( $shortcode[5] ) && has_shortcode( $shortcode[5], $tag ) ) {
+				return true;
+			}
+		}
+	}
+	return false;
+}
+
+/**
+ * Returns a list of registered shortcode names found in the given content.
+ *
+ * Example usage:
+ *
+ *     get_shortcode_tags_in_content( '[audio src="file.mp3"][/audio] [foo] [gallery ids="1,2,3"]' );
+ *     // array( 'audio', 'gallery' )
+ *
+ * @since 6.3.2
+ *
+ * @param string $content The content to check.
+ * @return string[] An array of registered shortcode names found in the content.
+ */
+function get_shortcode_tags_in_content( $content ) {
+	if ( false === strpos( $content, '[' ) ) {
+		return array();
+	}
+
+	preg_match_all( '/' . get_shortcode_regex() . '/', $content, $matches, PREG_SET_ORDER );
+	if ( empty( $matches ) ) {
+		return array();
+	}
+
+	$tags = array();
+	foreach ( $matches as $shortcode ) {
+		$tags[] = $shortcode[2];
+
+		if ( ! empty( $shortcode[5] ) ) {
+			$deep_tags = get_shortcode_tags_in_content( $shortcode[5] );
+			if ( ! empty( $deep_tags ) ) {
+				$tags = array_merge( $tags, $deep_tags );
+			}
+		}
+	}
+
+	return $tags;
+}
+
+/**
+ * Searches content for shortcodes and filter shortcodes through their hooks.
+ *
+ * This function is an alias for do_shortcode().
+ *
+ * @since 5.4.0
+ *
+ * @see do_shortcode()
+ *
+ * @param string $content     Content to search for shortcodes.
+ * @param bool   $ignore_html When true, shortcodes inside HTML elements will be skipped.
+ *                            Default false.
+ * @return string Content with shortcodes filtered out.
+ */
+function apply_shortcodes( $content, $ignore_html = false ) {
+	return do_shortcode( $content, $ignore_html );
+}
+
+/**
+ * Searches content for shortcodes and filter shortcodes through their hooks.
+ *
+ * If there are no shortcode tags defined, then the content will be returned
+ * without any filtering. This might cause issues when plugins are disabled but
+ * the shortcode will still show up in the post or content.
+ *
+ * @since 2.5.0
+ *
+ * @global array $shortcode_tags List of shortcode tags and their callback hooks.
+ *
+ * @param string $content     Content to search for shortcodes.
+ * @param bool   $ignore_html When true, shortcodes inside HTML elements will be skipped.
+ *                            Default false.
+ * @return string Content with shortcodes filtered out.
+ */
+function do_shortcode( $content, $ignore_html = false ) {
+	global $shortcode_tags;
+
+	if ( ! str_contains( $content, '[' ) ) {
+		return $content;
+	}
+
+	if ( empty( $shortcode_tags ) || ! is_array( $shortcode_tags ) ) {
+		return $content;
+	}
+
+	// Find all registered tag names in $content.
+	preg_match_all( '@\[([^<>&/\[\]\x00-\x20=]++)@', $content, $matches );
+	$tagnames = array_intersect( array_keys( $shortcode_tags ), $matches[1] );
+
+	if ( empty( $tagnames ) ) {
+		return $content;
+	}
+
+	// Ensure this context is only added once if shortcodes are nested.
+	$has_filter   = has_filter( 'wp_get_attachment_image_context', '_filter_do_shortcode_context' );
+	$filter_added = false;
+
+	if ( ! $has_filter ) {
+		$filter_added = add_filter( 'wp_get_attachment_image_context', '_filter_do_shortcode_context' );
+	}
+
+	$content = do_shortcodes_in_html_tags( $content, $ignore_html, $tagnames );
+
+	$pattern = get_shortcode_regex( $tagnames );
+	$content = preg_replace_callback( "/$pattern/", 'do_shortcode_tag', $content );
+
+	// Always restore square braces so we don't break things like <!--[if IE ]>.
+	$content = unescape_invalid_shortcodes( $content );
+
+	// Only remove the filter if it was added in this scope.
+	if ( $filter_added ) {
+		remove_filter( 'wp_get_attachment_image_context', '_filter_do_shortcode_context' );
+	}
+
+	return $content;
+}
+
+/**
+ * Filter the `wp_get_attachment_image_context` hook during shortcode rendering.
+ *
+ * When wp_get_attachment_image() is called during shortcode rendering, we need to make clear
+ * that the context is a shortcode and not part of the theme's template rendering logic.
+ *
+ * @since 6.3.0
+ * @access private
+ *
+ * @return string The filtered context value for wp_get_attachment_images when doing shortcodes.
+ */
+function _filter_do_shortcode_context() {
+	return 'do_shortcode';
+}
+
+/**
+ * Retrieves the shortcode regular expression for searching.
+ *
+ * The regular expression combines the shortcode tags in the regular expression
+ * in a regex class.
+ *
+ * The regular expression contains 6 different sub matches to help with parsing.
+ *
+ * 1 - An extra [ to allow for escaping shortcodes with double [[]]
+ * 2 - The shortcode name
+ * 3 - The shortcode argument list
+ * 4 - The self closing /
+ * 5 - The content of a shortcode when it wraps some content.
+ * 6 - An extra ] to allow for escaping shortcodes with double [[]]
+ *
+ * @since 2.5.0
+ * @since 4.4.0 Added the `$tagnames` parameter.
+ *
+ * @global array $shortcode_tags
+ *
+ * @param array $tagnames Optional. List of shortcodes to find. Defaults to all registered shortcodes.
+ * @return string The shortcode search regular expression
+ */
+function get_shortcode_regex( $tagnames = null ) {
+	global $shortcode_tags;
+
+	if ( empty( $tagnames ) ) {
+		$tagnames = array_keys( $shortcode_tags );
+	}
+	$tagregexp = implode( '|', array_map( 'preg_quote', $tagnames ) );
+
+	/*
+	 * WARNING! Do not change this regex without changing do_shortcode_tag() and strip_shortcode_tag().
+	 * Also, see shortcode_unautop() and shortcode.js.
+	 */
+
+	// phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation
+	return '\\['                             // Opening bracket.
+		. '(\\[?)'                           // 1: Optional second opening bracket for escaping shortcodes: [[tag]].
+		. "($tagregexp)"                     // 2: Shortcode name.
+		. '(?![\\w-])'                       // Not followed by word character or hyphen.
+		. '('                                // 3: Unroll the loop: Inside the opening shortcode tag.
+		.     '[^\\]\\/]*'                   // Not a closing bracket or forward slash.
+		.     '(?:'
+		.         '\\/(?!\\])'               // A forward slash not followed by a closing bracket.
+		.         '[^\\]\\/]*'               // Not a closing bracket or forward slash.
+		.     ')*?'
+		. ')'
+		. '(?:'
+		.     '(\\/)'                        // 4: Self closing tag...
+		.     '\\]'                          // ...and closing bracket.
+		. '|'
+		.     '\\]'                          // Closing bracket.
+		.     '(?:'
+		.         '('                        // 5: Unroll the loop: Optionally, anything between the opening and closing shortcode tags.
+		.             '[^\\[]*+'             // Not an opening bracket.
+		.             '(?:'
+		.                 '\\[(?!\\/\\2\\])' // An opening bracket not followed by the closing shortcode tag.
+		.                 '[^\\[]*+'         // Not an opening bracket.
+		.             ')*+'
+		.         ')'
+		.         '\\[\\/\\2\\]'             // Closing shortcode tag.
+		.     ')?'
+		. ')'
+		. '(\\]?)';                          // 6: Optional second closing brocket for escaping shortcodes: [[tag]].
+	// phpcs:enable
+}
+
+/**
+ * Regular Expression callable for do_shortcode() for calling shortcode hook.
+ *
+ * @see get_shortcode_regex() for details of the match array contents.
+ *
+ * @since 2.5.0
+ * @access private
+ *
+ * @global array $shortcode_tags
+ *
+ * @param array $m {
+ *     Regular expression match array.
+ *
+ *     @type string $0 Entire matched shortcode text.
+ *     @type string $1 Optional second opening bracket for escaping shortcodes.
+ *     @type string $2 Shortcode name.
+ *     @type string $3 Shortcode arguments list.
+ *     @type string $4 Optional self closing slash.
+ *     @type string $5 Content of a shortcode when it wraps some content.
+ *     @type string $6 Optional second closing brocket for escaping shortcodes.
+ * }
+ * @return string Shortcode output.
+ */
+function do_shortcode_tag( $m ) {
+	global $shortcode_tags;
+
+	// Allow [[foo]] syntax for escaping a tag.
+	if ( '[' === $m[1] && ']' === $m[6] ) {
+		return substr( $m[0], 1, -1 );
+	}
+
+	$tag  = $m[2];
+	$attr = shortcode_parse_atts( $m[3] );
+
+	if ( ! is_callable( $shortcode_tags[ $tag ] ) ) {
+		_doing_it_wrong(
+			__FUNCTION__,
+			/* translators: %s: Shortcode tag. */
+			sprintf( __( 'Attempting to parse a shortcode without a valid callback: %s' ), $tag ),
+			'4.3.0'
+		);
+		return $m[0];
+	}
+
+	/**
+	 * Filters whether to call a shortcode callback.
+	 *
+	 * Returning a non-false value from filter will short-circuit the
+	 * shortcode generation process, returning that value instead.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param false|string $output Short-circuit return value. Either false or the value to replace the shortcode with.
+	 * @param string       $tag    Shortcode name.
+	 * @param array|string $attr   Shortcode attributes array or the original arguments string if it cannot be parsed.
+	 * @param array        $m      Regular expression match array.
+	 */
+	$return = apply_filters( 'pre_do_shortcode_tag', false, $tag, $attr, $m );
+	if ( false !== $return ) {
+		return $return;
+	}
+
+	$content = isset( $m[5] ) ? $m[5] : null;
+
+	$output = $m[1] . call_user_func( $shortcode_tags[ $tag ], $attr, $content, $tag ) . $m[6];
+
+	/**
+	 * Filters the output created by a shortcode callback.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param string       $output Shortcode output.
+	 * @param string       $tag    Shortcode name.
+	 * @param array|string $attr   Shortcode attributes array or the original arguments string if it cannot be parsed.
+	 * @param array        $m      Regular expression match array.
+	 */
+	return apply_filters( 'do_shortcode_tag', $output, $tag, $attr, $m );
+}
+
+/**
+ * Searches only inside HTML elements for shortcodes and process them.
+ *
+ * Any [ or ] characters remaining inside elements will be HTML encoded
+ * to prevent interference with shortcodes that are outside the elements.
+ * Assumes $content processed by KSES already.  Users with unfiltered_html
+ * capability may get unexpected output if angle braces are nested in tags.
+ *
+ * @since 4.2.3
+ *
+ * @param string $content     Content to search for shortcodes.
+ * @param bool   $ignore_html When true, all square braces inside elements will be encoded.
+ * @param array  $tagnames    List of shortcodes to find.
+ * @return string Content with shortcodes filtered out.
+ */
+function do_shortcodes_in_html_tags( $content, $ignore_html, $tagnames ) {
+	// Normalize entities in unfiltered HTML before adding placeholders.
+	$trans   = array(
+		'&#91;' => '&#091;',
+		'&#93;' => '&#093;',
+	);
+	$content = strtr( $content, $trans );
+	$trans   = array(
+		'[' => '&#91;',
+		']' => '&#93;',
+	);
+
+	$pattern = get_shortcode_regex( $tagnames );
+	$textarr = wp_html_split( $content );
+
+	foreach ( $textarr as &$element ) {
+		if ( '' === $element || '<' !== $element[0] ) {
+			continue;
+		}
+
+		$noopen  = ! str_contains( $element, '[' );
+		$noclose = ! str_contains( $element, ']' );
+		if ( $noopen || $noclose ) {
+			// This element does not contain shortcodes.
+			if ( $noopen xor $noclose ) {
+				// Need to encode stray '[' or ']' chars.
+				$element = strtr( $element, $trans );
+			}
+			continue;
+		}
+
+		if ( $ignore_html || str_starts_with( $element, '<!--' ) || str_starts_with( $element, '<![CDATA[' ) ) {
+			// Encode all '[' and ']' chars.
+			$element = strtr( $element, $trans );
+			continue;
+		}
+
+		$attributes = wp_kses_attr_parse( $element );
+		if ( false === $attributes ) {
+			// Some plugins are doing things like [name] <[email]>.
+			if ( 1 === preg_match( '%^<\s*\[\[?[^\[\]]+\]%', $element ) ) {
+				$element = preg_replace_callback( "/$pattern/", 'do_shortcode_tag', $element );
+			}
+
+			// Looks like we found some crazy unfiltered HTML. Skipping it for sanity.
+			$element = strtr( $element, $trans );
+			continue;
+		}
+
+		// Get element name.
+		$front   = array_shift( $attributes );
+		$back    = array_pop( $attributes );
+		$matches = array();
+		preg_match( '%[a-zA-Z0-9]+%', $front, $matches );
+		$elname = $matches[0];
+
+		// Look for shortcodes in each attribute separately.
+		foreach ( $attributes as &$attr ) {
+			$open  = strpos( $attr, '[' );
+			$close = strpos( $attr, ']' );
+			if ( false === $open || false === $close ) {
+				continue; // Go to next attribute. Square braces will be escaped at end of loop.
+			}
+			$double = strpos( $attr, '"' );
+			$single = strpos( $attr, "'" );
+			if ( ( false === $single || $open < $single ) && ( false === $double || $open < $double ) ) {
+				/*
+				 * $attr like '[shortcode]' or 'name = [shortcode]' implies unfiltered_html.
+				 * In this specific situation we assume KSES did not run because the input
+				 * was written by an administrator, so we should avoid changing the output
+				 * and we do not need to run KSES here.
+				 */
+				$attr = preg_replace_callback( "/$pattern/", 'do_shortcode_tag', $attr );
+			} else {
+				/*
+				 * $attr like 'name = "[shortcode]"' or "name = '[shortcode]'".
+				 * We do not know if $content was unfiltered. Assume KSES ran before shortcodes.
+				 */
+				$count    = 0;
+				$new_attr = preg_replace_callback( "/$pattern/", 'do_shortcode_tag', $attr, -1, $count );
+				if ( $count > 0 ) {
+					// Sanitize the shortcode output using KSES.
+					$new_attr = wp_kses_one_attr( $new_attr, $elname );
+					if ( '' !== trim( $new_attr ) ) {
+						// The shortcode is safe to use now.
+						$attr = $new_attr;
+					}
+				}
+			}
+		}
+		$element = $front . implode( '', $attributes ) . $back;
+
+		// Now encode any remaining '[' or ']' chars.
+		$element = strtr( $element, $trans );
+	}
+
+	$content = implode( '', $textarr );
+
+	return $content;
+}
+
+/**
+ * Removes placeholders added by do_shortcodes_in_html_tags().
+ *
+ * @since 4.2.3
+ *
+ * @param string $content Content to search for placeholders.
+ * @return string Content with placeholders removed.
+ */
+function unescape_invalid_shortcodes( $content ) {
+	// Clean up entire string, avoids re-parsing HTML.
+	$trans = array(
+		'&#91;' => '[',
+		'&#93;' => ']',
+	);
+
+	$content = strtr( $content, $trans );
+
+	return $content;
+}
+
+/**
+ * Retrieves the shortcode attributes regex.
+ *
+ * @since 4.4.0
+ *
+ * @return string The shortcode attribute regular expression.
+ */
+function get_shortcode_atts_regex() {
+	return '/([\w-]+)\s*=\s*"([^"]*)"(?:\s|$)|([\w-]+)\s*=\s*\'([^\']*)\'(?:\s|$)|([\w-]+)\s*=\s*([^\s\'"]+)(?:\s|$)|"([^"]*)"(?:\s|$)|\'([^\']*)\'(?:\s|$)|(\S+)(?:\s|$)/';
+}
+
+/**
+ * Retrieves all attributes from the shortcodes tag.
+ *
+ * The attributes list has the attribute name as the key and the value of the
+ * attribute as the value in the key/value pair. This allows for easier
+ * retrieval of the attributes, since all attributes have to be known.
+ *
+ * @since 2.5.0
+ *
+ * @param string $text Shortcode arguments list.
+ * @return array|string Array of attribute values keyed by attribute name.
+ *                      Returns empty array if there are no attributes.
+ *                      Returns the original arguments string if it cannot be parsed.
+ */
+function shortcode_parse_atts( $text ) {
+	$atts    = array();
+	$pattern = get_shortcode_atts_regex();
+	$text    = preg_replace( "/[\x{00a0}\x{200b}]+/u", ' ', $text );
+	if ( preg_match_all( $pattern, $text, $match, PREG_SET_ORDER ) ) {
+		foreach ( $match as $m ) {
+			if ( ! empty( $m[1] ) ) {
+				$atts[ strtolower( $m[1] ) ] = stripcslashes( $m[2] );
+			} elseif ( ! empty( $m[3] ) ) {
+				$atts[ strtolower( $m[3] ) ] = stripcslashes( $m[4] );
+			} elseif ( ! empty( $m[5] ) ) {
+				$atts[ strtolower( $m[5] ) ] = stripcslashes( $m[6] );
+			} elseif ( isset( $m[7] ) && strlen( $m[7] ) ) {
+				$atts[] = stripcslashes( $m[7] );
+			} elseif ( isset( $m[8] ) && strlen( $m[8] ) ) {
+				$atts[] = stripcslashes( $m[8] );
+			} elseif ( isset( $m[9] ) ) {
+				$atts[] = stripcslashes( $m[9] );
+			}
+		}
+
+		// Reject any unclosed HTML elements.
+		foreach ( $atts as &$value ) {
+			if ( str_contains( $value, '<' ) ) {
+				if ( 1 !== preg_match( '/^[^<]*+(?:<[^>]*+>[^<]*+)*+$/', $value ) ) {
+					$value = '';
+				}
+			}
+		}
+	} else {
+		$atts = ltrim( $text );
+	}
+
+	return $atts;
+}
+
+/**
+ * Combines user attributes with known attributes and fill in defaults when needed.
+ *
+ * The pairs should be considered to be all of the attributes which are
+ * supported by the caller and given as a list. The returned attributes will
+ * only contain the attributes in the $pairs list.
+ *
+ * If the $atts list has unsupported attributes, then they will be ignored and
+ * removed from the final returned list.
+ *
+ * @since 2.5.0
+ *
+ * @param array  $pairs     Entire list of supported attributes and their defaults.
+ * @param array  $atts      User defined attributes in shortcode tag.
+ * @param string $shortcode Optional. The name of the shortcode, provided for context to enable filtering
+ * @return array Combined and filtered attribute list.
+ */
+function shortcode_atts( $pairs, $atts, $shortcode = '' ) {
+	$atts = (array) $atts;
+	$out  = array();
+	foreach ( $pairs as $name => $default ) {
+		if ( array_key_exists( $name, $atts ) ) {
+			$out[ $name ] = $atts[ $name ];
+		} else {
+			$out[ $name ] = $default;
+		}
+	}
+
+	if ( $shortcode ) {
+		/**
+		 * Filters shortcode attributes.
+		 *
+		 * If the third parameter of the shortcode_atts() function is present then this filter is available.
+		 * The third parameter, $shortcode, is the name of the shortcode.
+		 *
+		 * @since 3.6.0
+		 * @since 4.4.0 Added the `$shortcode` parameter.
+		 *
+		 * @param array  $out       The output array of shortcode attributes.
+		 * @param array  $pairs     The supported attributes and their defaults.
+		 * @param array  $atts      The user defined shortcode attributes.
+		 * @param string $shortcode The shortcode name.
+		 */
+		$out = apply_filters( "shortcode_atts_{$shortcode}", $out, $pairs, $atts, $shortcode );
+	}
+
+	return $out;
+}
+
+/**
+ * Removes all shortcode tags from the given content.
+ *
+ * @since 2.5.0
+ *
+ * @global array $shortcode_tags
+ *
+ * @param string $content Content to remove shortcode tags.
+ * @return string Content without shortcode tags.
+ */
+function strip_shortcodes( $content ) {
+	global $shortcode_tags;
+
+	if ( ! str_contains( $content, '[' ) ) {
+		return $content;
+	}
+
+	if ( empty( $shortcode_tags ) || ! is_array( $shortcode_tags ) ) {
+		return $content;
+	}
+
+	// Find all registered tag names in $content.
+	preg_match_all( '@\[([^<>&/\[\]\x00-\x20=]++)@', $content, $matches );
+
+	$tags_to_remove = array_keys( $shortcode_tags );
+
+	/**
+	 * Filters the list of shortcode tags to remove from the content.
+	 *
+	 * @since 4.7.0
+	 *
+	 * @param array  $tags_to_remove Array of shortcode tags to remove.
+	 * @param string $content        Content shortcodes are being removed from.
+	 */
+	$tags_to_remove = apply_filters( 'strip_shortcodes_tagnames', $tags_to_remove, $content );
+
+	$tagnames = array_intersect( $tags_to_remove, $matches[1] );
+
+	if ( empty( $tagnames ) ) {
+		return $content;
+	}
+
+	$content = do_shortcodes_in_html_tags( $content, true, $tagnames );
+
+	$pattern = get_shortcode_regex( $tagnames );
+	$content = preg_replace_callback( "/$pattern/", 'strip_shortcode_tag', $content );
+
+	// Always restore square braces so we don't break things like <!--[if IE ]>.
+	$content = unescape_invalid_shortcodes( $content );
+
+	return $content;
+}
+
+/**
+ * Strips a shortcode tag based on RegEx matches against post content.
+ *
+ * @since 3.3.0
+ *
+ * @param array $m RegEx matches against post content.
+ * @return string|false The content stripped of the tag, otherwise false.
+ */
+function strip_shortcode_tag( $m ) {
+	// Allow [[foo]] syntax for escaping a tag.
+	if ( '[' === $m[1] && ']' === $m[6] ) {
+		return substr( $m[0], 1, -1 );
+	}
+
+	return $m[1] . $m[6];
+}
-- 
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