<?php
-
-/*
-
-An API for creating shortcode tags that support attributes and enclosed content, such as:
-
-[shortcode /]
-[shortcode foo="bar" baz="bing" /]
-[shortcode foo="bar"]content[/shortcode]
-
-tag and attrbute parsing regexp code based on the Textpattern tag parser.
-
-To apply shortcode tags to content:
-
-$out = do_shortcode($content);
-
-Simplest example of a shortcode tag using the API:
-
-// [footag foo="bar"]
-function footag_func($atts) {
- return "foo = {$atts[foo]}";
-}
-add_shortcode('footag', 'footag_func');
-
-Example with nice attribute defaults:
-
-// [bartag foo="bar"]
-function bartag_func($atts) {
- extract(shortcode_atts(array(
- 'foo' => 'no foo',
- 'baz' => 'default baz',
- ), $atts));
-
- return "foo = {$foo}";
-}
-add_shortcode('bartag', 'bartag_func');
-
-Example with enclosed content:
-
-// [baztag]content[/baztag]
-function baztag_func($atts, $content='') {
- return "content = $content";
-}
-add_shortcode('baztag', 'baztag_func');
-
-*/
-
+/**
+ * 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://codex.wordpress.org/Shortcode_API
+ *
+ * @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();
+/**
+ * Add hook for shortcode tag.
+ *
+ * There can only be one hook for each shortcode. Which means that if another
+ * plugin has a similar shortcode, it will override yours or yours will override
+ * theirs depending on which order the plugins are included and/or ran.
+ *
+ * Simplest example of a shortcode tag using the API:
+ *
+ * // [footag foo="bar"]
+ * function footag_func( $atts ) {
+ * return "foo = {
+ * $atts[foo]
+ * }";
+ * }
+ * add_shortcode( 'footag', 'footag_func' );
+ *
+ * Example with nice attribute defaults:
+ *
+ * // [bartag foo="bar"]
+ * function bartag_func( $atts ) {
+ * $args = shortcode_atts( array(
+ * 'foo' => 'no foo',
+ * 'baz' => 'default baz',
+ * ), $atts );
+ *
+ * return "foo = {$args['foo']}";
+ * }
+ * add_shortcode( 'bartag', 'bartag_func' );
+ *
+ * Example with enclosed content:
+ *
+ * // [baztag]content[/baztag]
+ * function baztag_func( $atts, $content = '' ) {
+ * return "content = $content";
+ * }
+ * add_shortcode( 'baztag', 'baztag_func' );
+ *
+ * @since 2.5.0
+ *
+ * @global array $shortcode_tags
+ *
+ * @param string $tag Shortcode tag to be searched in post content.
+ * @param callable $func Hook to run when shortcode is found.
+ */
function add_shortcode($tag, $func) {
global $shortcode_tags;
- if ( is_callable($func) )
- $shortcode_tags[$tag] = $func;
+ if ( '' == trim( $tag ) ) {
+ $message = __( 'Invalid shortcode name: Empty name given.' );
+ _doing_it_wrong( __FUNCTION__, $message, '4.4.0' );
+ return;
+ }
+
+ if ( 0 !== preg_match( '@[<>&/\[\]\x00-\x20=]@', $tag ) ) {
+ /* translators: 1: shortcode name, 2: space separated list of reserved characters */
+ $message = sprintf( __( 'Invalid shortcode name: %1$s. Do not use spaces or reserved characters: %2$s' ), $tag, '& / < > [ ] =' );
+ _doing_it_wrong( __FUNCTION__, $message, '4.4.0' );
+ return;
+ }
+
+ $shortcode_tags[ $tag ] = $func;
}
+/**
+ * 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]);
}
+/**
+ * Clear all shortcodes.
+ *
+ * This function is simple, it clears all of the shortcode tags by replacing the
+ * shortcodes global by a empty array. This is actually a very efficient method
+ * for removing all shortcodes.
+ *
+ * @since 2.5.0
+ *
+ * @global array $shortcode_tags
+ */
function remove_all_shortcodes() {
global $shortcode_tags;
$shortcode_tags = array();
}
-function do_shortcode($content) {
+/**
+ * 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 );
+}
+
+/**
+ * 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 ( false === strpos( $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;
+}
+
+/**
+ * Search 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.
+ * @return string Content with shortcodes filtered out.
+ */
+function do_shortcode( $content, $ignore_html = false ) {
+ global $shortcode_tags;
+
+ if ( false === strpos( $content, '[' ) ) {
+ return $content;
+ }
if (empty($shortcode_tags) || !is_array($shortcode_tags))
return $content;
- $pattern = get_shortcode_regex();
- return preg_replace_callback('/'.$pattern.'/s', 'do_shortcode_tag', $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;
+ }
+
+ $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 );
+
+ return $content;
}
-function get_shortcode_regex() {
+/**
+ * Retrieve 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
+ *
+ * @global array $shortcode_tags
+ *
+ * @param array $tagnames List of shortcodes to find. Optional. Defaults to all registered shortcodes.
+ * @return string The shortcode search regular expression
+ */
+function get_shortcode_regex( $tagnames = null ) {
global $shortcode_tags;
- $tagnames = array_keys($shortcode_tags);
+
+ if ( empty( $tagnames ) ) {
+ $tagnames = array_keys( $shortcode_tags );
+ }
$tagregexp = join( '|', array_map('preg_quote', $tagnames) );
- return '\[('.$tagregexp.')\b(.*?)(?:(\/))?\](?:(.+?)\[\/\1\])?';
+ // WARNING! Do not change this regex without changing do_shortcode_tag() and strip_shortcode_tag()
+ // Also, see shortcode_unautop() and shortcode.js.
+ return
+ '\\[' // Opening bracket
+ . '(\\[?)' // 1: Optional second opening bracket for escaping shortcodes: [[tag]]
+ . "($tagregexp)" // 2: Shortcode name
+ . '(?![\\w-])' // Not followed by word character or hyphen
+ . '(' // 3: Unroll the loop: Inside the opening shortcode tag
+ . '[^\\]\\/]*' // Not a closing bracket or forward slash
+ . '(?:'
+ . '\\/(?!\\])' // A forward slash not followed by a closing bracket
+ . '[^\\]\\/]*' // Not a closing bracket or forward slash
+ . ')*?'
+ . ')'
+ . '(?:'
+ . '(\\/)' // 4: Self closing tag ...
+ . '\\]' // ... and closing bracket
+ . '|'
+ . '\\]' // Closing bracket
+ . '(?:'
+ . '(' // 5: Unroll the loop: Optionally, anything between the opening and closing shortcode tags
+ . '[^\\[]*+' // Not an opening bracket
+ . '(?:'
+ . '\\[(?!\\/\\2\\])' // An opening bracket not followed by the closing shortcode tag
+ . '[^\\[]*+' // Not an opening bracket
+ . ')*+'
+ . ')'
+ . '\\[\\/\\2\\]' // Closing shortcode tag
+ . ')?'
+ . ')'
+ . '(\\]?)'; // 6: Optional second closing brocket for escaping shortcodes: [[tag]]
}
-function do_shortcode_tag($m) {
+/**
+ * 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
+ * @return string|false False on failure.
+ */
+function do_shortcode_tag( $m ) {
global $shortcode_tags;
- $tag = $m[1];
- $attr = shortcode_parse_atts($m[2]);
+ // 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( $m[3] );
- if ( isset($m[4]) ) {
+ if ( ! is_callable( $shortcode_tags[ $tag ] ) ) {
+ /* translators: %s: shortcode tag */
+ $message = sprintf( __( 'Attempting to parse a shortcode without a valid callback: %s' ), $tag );
+ _doing_it_wrong( __FUNCTION__, $message, '4.3.0' );
+ return $m[0];
+ }
+
+ if ( isset( $m[5] ) ) {
// enclosing tag - extra parameter
- return call_user_func($shortcode_tags[$tag], $attr, $m[4]);
+ return $m[1] . call_user_func( $shortcode_tags[$tag], $attr, $m[5], $tag ) . $m[6];
} else {
// self-closing tag
- return call_user_func($shortcode_tags[$tag], $attr);
+ return $m[1] . call_user_func( $shortcode_tags[$tag], $attr, null, $tag ) . $m[6];
}
}
+/**
+ * Search 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( '[' => '[', ']' => ']' );
+ $content = strtr( $content, $trans );
+ $trans = array( '[' => '[', ']' => ']' );
+
+ $pattern = get_shortcode_regex( $tagnames );
+ $textarr = wp_html_split( $content );
+
+ foreach ( $textarr as &$element ) {
+ if ( '' == $element || '<' !== $element[0] ) {
+ continue;
+ }
+
+ $noopen = false === strpos( $element, '[' );
+ $noclose = false === strpos( $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 || '<!--' === substr( $element, 0, 4 ) || '<![CDATA[' === substr( $element, 0, 9 ) ) {
+ // 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;
+}
+
+/**
+ * Remove 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( '[' => '[', ']' => ']' );
+ $content = strtr( $content, $trans );
+
+ return $content;
+}
+
+/**
+ * Retrieve the shortcode attributes regex.
+ *
+ * @since 4.4.0
+ *
+ * @return string The shortcode attribute regular expression
+ */
+function get_shortcode_atts_regex() {
+ return '/([\w-]+)\s*=\s*"([^"]*)"(?:\s|$)|([\w-]+)\s*=\s*\'([^\']*)\'(?:\s|$)|([\w-]+)\s*=\s*([^\s\'"]+)(?:\s|$)|"([^"]*)"(?:\s|$)|(\S+)(?:\s|$)/';
+}
+
+/**
+ * Retrieve 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
+ * @return array|string List of attribute values.
+ * Returns empty array if trim( $text ) == '""'.
+ * Returns empty string if trim( $text ) == ''.
+ * All other matches are checked for not empty().
+ */
function shortcode_parse_atts($text) {
$atts = array();
- $pattern = '/(\w+)\s*=\s*"([^"]*)"(?:\s|$)|(\w+)\s*=\s*\'([^\']*)\'(?:\s|$)|(\w+)\s*=\s*([^\s\'"]+)(?:\s|$)|"([^"]*)"(?:\s|$)|(\S+)(?:\s|$)/';
+ $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) {
$atts[strtolower($m[3])] = stripcslashes($m[4]);
elseif (!empty($m[5]))
$atts[strtolower($m[5])] = stripcslashes($m[6]);
- elseif (isset($m[7]) and strlen($m[7]))
+ elseif (isset($m[7]) && strlen($m[7]))
$atts[] = stripcslashes($m[7]);
elseif (isset($m[8]))
$atts[] = stripcslashes($m[8]);
}
+
+ // Reject any unclosed HTML elements
+ foreach( $atts as &$value ) {
+ if ( false !== strpos( $value, '<' ) ) {
+ if ( 1 !== preg_match( '/^[^<]*+(?:<[^>]*+>[^<]*+)*+$/', $value ) ) {
+ $value = '';
+ }
+ }
+ }
} else {
$atts = ltrim($text);
}
return $atts;
}
-function shortcode_atts($pairs, $atts) {
+/**
+ * Combine 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 => $default) {
+ foreach ($pairs as $name => $default) {
if ( array_key_exists($name, $atts) )
$out[$name] = $atts[$name];
else
$out[$name] = $default;
}
+ /**
+ * Filters a shortcode's default 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.
+ */
+ if ( $shortcode ) {
+ $out = apply_filters( "shortcode_atts_{$shortcode}", $out, $pairs, $atts, $shortcode );
+ }
+
return $out;
}
-add_filter('the_content', 'do_shortcode', 11); // AFTER wpautop()
+/**
+ * Remove 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 ( false === strpos( $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;
+ }
+
+ $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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