625 lines
18 KiB
PHP
625 lines
18 KiB
PHP
<?php
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/**
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* A simple parser that allows you to map BBCode-like "shortcodes" to an arbitrary callback.
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* It is a simple regex based parser that allows you to replace simple bbcode-like tags
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* within a HTMLText or HTMLVarchar field when rendered into a template. The API is inspired by and very similar to the
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* [Wordpress implementation](http://codex.wordpress.org/Shortcode_API) of shortcodes.
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*
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* @see http://doc.silverstripe.org/framework/en/reference/shortcodes
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* @package framework
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* @subpackage misc
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*/
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class ShortcodeParser extends Object {
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public function img_shortcode($attrs) {
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return "<img src='".$attrs['src']."'>";
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}
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protected static $instances = array();
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protected static $active_instance = 'default';
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// --------------------------------------------------------------------------------------------------------------
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protected $shortcodes = array();
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// --------------------------------------------------------------------------------------------------------------
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/**
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* Get the {@link ShortcodeParser} instance that is attached to a particular identifier.
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*
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* @param string $identifier Defaults to "default".
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* @return ShortcodeParser
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*/
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public static function get($identifier = 'default') {
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if(!array_key_exists($identifier, self::$instances)) {
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self::$instances[$identifier] = static::create();
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}
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return self::$instances[$identifier];
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}
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/**
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* Get the currently active/default {@link ShortcodeParser} instance.
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*
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* @return ShortcodeParser
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*/
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public static function get_active() {
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return static::get(self::$active_instance);
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}
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/**
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* Set the identifier to use for the current active/default {@link ShortcodeParser} instance.
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*
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* @param string $identifier
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*/
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public static function set_active($identifier) {
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self::$active_instance = (string) $identifier;
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}
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// --------------------------------------------------------------------------------------------------------------
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/**
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* Register a shortcode, and attach it to a PHP callback.
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*
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* The callback for a shortcode will have the following arguments passed to it:
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* - Any parameters attached to the shortcode as an associative array (keys are lower-case).
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* - Any content enclosed within the shortcode (if it is an enclosing shortcode). Note that any content within
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* this will not have been parsed, and can optionally be fed back into the parser.
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* - The {@link ShortcodeParser} instance used to parse the content.
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* - The shortcode tag name that was matched within the parsed content.
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* - An associative array of extra information about the shortcode being parsed.
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*
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* @param string $shortcode The shortcode tag to map to the callback - normally in lowercase_underscore format.
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* @param callback $callback The callback to replace the shortcode with.
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* @return $this
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*/
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public function register($shortcode, $callback) {
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if(is_callable($callback)) {
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$this->shortcodes[$shortcode] = $callback;
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} else {
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throw new InvalidArgumentException("Callback is not callable");
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}
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return $this;
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}
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/**
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* Check if a shortcode has been registered.
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*
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* @param string $shortcode
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* @return bool
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*/
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public function registered($shortcode) {
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return array_key_exists($shortcode, $this->shortcodes);
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}
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/**
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* Remove a specific registered shortcode.
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*
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* @param string $shortcode
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*/
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public function unregister($shortcode) {
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if($this->registered($shortcode)) unset($this->shortcodes[$shortcode]);
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}
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/**
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* Remove all registered shortcodes.
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*/
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public function clear() {
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$this->shortcodes = array();
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}
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/**
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* Call a shortcode and return its replacement text
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* Returns false if the shortcode isn't registered
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*/
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public function callShortcode($tag, $attributes, $content, $extra = array()) {
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if (!$tag || !isset($this->shortcodes[$tag])) return false;
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return call_user_func($this->shortcodes[$tag], $attributes, $content, $this, $tag, $extra);
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}
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/**
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* Return the text to insert in place of a shoprtcode.
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* Behaviour in the case of missing shortcodes depends on the setting of ShortcodeParser::$error_behavior.
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*
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* @param array $tag A map containing the the following keys:
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* - 'open': The name of the tag
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* - 'attrs': Attributes of the tag
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* - 'content': Content of the tag
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* @param array $extra Extra-meta data
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* @param boolean $isHTMLAllowed A boolean indicating whether it's okay to insert HTML tags into the result
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*
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* @return bool|mixed|string
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*/
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public function getShortcodeReplacementText($tag, $extra = array(), $isHTMLAllowed = true) {
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$content = $this->callShortcode($tag['open'], $tag['attrs'], $tag['content'], $extra);
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// Missing tag
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if ($content === false) {
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if(ShortcodeParser::$error_behavior == ShortcodeParser::ERROR) {
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user_error('Unknown shortcode tag '.$tag['open'], E_USER_ERRROR);
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}
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else if (self::$error_behavior == self::WARN && $isHTMLAllowed) {
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$content = '<strong class="warning">'.$tag['text'].'</strong>';
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}
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else if(ShortcodeParser::$error_behavior == ShortcodeParser::STRIP) {
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return '';
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}
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else {
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return $tag['text'];
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}
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}
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return $content;
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}
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// --------------------------------------------------------------------------------------------------------------
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protected function removeNode($node) {
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$node->parentNode->removeChild($node);
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}
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protected function insertAfter($new, $after) {
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$parent = $after->parentNode;
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$next = $after->nextSibling;
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if ($next) {
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$parent->insertBefore($new, $next);
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}
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else {
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$parent->appendChild($new);
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}
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}
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protected function insertListAfter($new, $after) {
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$doc = $after->ownerDocument; $parent = $after->parentNode; $next = $after->nextSibling;
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for ($i = 0; $i < $new->length; $i++) {
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$imported = $doc->importNode($new->item($i), true);
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if ($next) {
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$parent->insertBefore($imported, $next);
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}
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else {
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$parent->appendChild($imported);
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}
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}
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}
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/**
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* @var string
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*/
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protected static $marker_class = '--ss-shortcode-marker';
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protected static $block_level_elements = array(
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'address', 'article', 'aside', 'audio', 'blockquote', 'canvas', 'dd', 'div', 'dl', 'fieldset', 'figcaption',
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'figure', 'footer', 'form', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'header', 'hgroup', 'ol', 'output', 'p',
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'pre', 'section', 'table', 'ul'
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);
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protected static $attrrx = '
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([^\s\/\'"=,]+) # Name
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\s* = \s*
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(?:
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(?:\'([^\']+)\') | # Value surrounded by \'
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(?:"([^"]+)") | # Value surrounded by "
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([^\s,\]]+) # Bare value
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)
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';
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protected static function attrrx() {
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return '/'.self::$attrrx.'/xS';
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}
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protected static $tagrx = '
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# HTML Tag
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<(?<element>(?:"[^"]*"[\'"]*|\'[^\']*\'[\'"]*|[^\'">])+)>
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| # Opening tag
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(?<oesc>\[?)
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\[
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(?<open>\w+)
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[\s,]*
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(?<attrs> (?: %s [\s,]*)* )
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\/?\]
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(?<cesc1>\]?)
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| # Closing tag
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\[\/
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(?<close>\w+)
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\]
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(?<cesc2>\]?)
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';
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protected static function tagrx() {
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return '/'.sprintf(self::$tagrx, self::$attrrx).'/xS';
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}
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const WARN = 'warn';
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const STRIP = 'strip';
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const LEAVE = 'leave';
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const ERROR = 'error';
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public static $error_behavior = self::LEAVE;
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/**
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* Look through a string that contains shortcode tags and pull out the locations and details
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* of those tags
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*
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* Doesn't support nested shortcode tags
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*
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* @param string $content
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* @return array - The list of tags found. When using an open/close pair, only one item will be in the array,
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* with "content" set to the text between the tags
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*/
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public function extractTags($content) {
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$tags = array();
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// Step 1: perform basic regex scan of individual tags
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if(preg_match_all(static::tagrx(), $content, $matches, PREG_SET_ORDER | PREG_OFFSET_CAPTURE)) {
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foreach($matches as $match) {
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// Ignore any elements
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if (empty($match['open'][0]) && empty($match['close'][0])) continue;
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// Pull the attributes out into a key/value hash
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$attrs = array();
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if (!empty($match['attrs'][0])) {
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preg_match_all(static::attrrx(), $match['attrs'][0], $attrmatches, PREG_SET_ORDER);
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foreach ($attrmatches as $attr) {
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list($whole, $name, $value) = array_values(array_filter($attr, function($attrPart) {
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return $attrPart !== '';
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}));
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$attrs[$name] = $value;
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}
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}
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// And store the indexes, tag details, etc
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$tags[] = array(
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'text' => $match[0][0],
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's' => $match[0][1],
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'e' => $match[0][1] + strlen($match[0][0]),
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'open' => isset($match['open'][0]) ? $match['open'][0] : null,
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'close' => isset($match['close'][0]) ? $match['close'][0] : null,
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'attrs' => $attrs,
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'content' => '',
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'escaped' => !empty($match['oesc'][0]) || !empty($match['cesc1'][0]) || !empty($match['cesc2'][0])
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);
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}
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}
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// Step 2: cluster open/close tag pairs into single entries
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$i = count($tags);
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while($i--) {
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if(!empty($tags[$i]['close'])) {
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// If the tag just before this one isn't the related opening tag, throw an error
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$err = null;
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if ($i == 0) {
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$err = 'Close tag "'.$tags[$i]['close'].'" is the first found tag, so has no related open tag';
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}
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else if (!$tags[$i-1]['open']) {
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$err = 'Close tag "'.$tags[$i]['close'].'" preceded by another close tag "'.
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$tags[$i-1]['close'].'"';
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}
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else if ($tags[$i]['close'] != $tags[$i-1]['open']) {
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$err = 'Close tag "'.$tags[$i]['close'].'" doesn\'t match preceding open tag "'.
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$tags[$i-1]['open'].'"';
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}
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if($err) {
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if(self::$error_behavior == self::ERROR) user_error($err, E_USER_ERRROR);
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}
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else {
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if ($tags[$i]['escaped']) {
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if (!$tags[$i-1]['escaped']) {
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$tags[$i]['e'] -= 1;
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$tags[$i]['escaped'] = false;
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}
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}
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else {
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if ($tags[$i-1]['escaped']) {
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$tags[$i-1]['s'] += 1;
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$tags[$i-1]['escaped'] = false;
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}
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}
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// Otherwise, grab content between tags, save in opening tag & delete the closing one
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$tags[$i-1]['text'] = substr($content, $tags[$i-1]['s'], $tags[$i]['e'] - $tags[$i-1]['s']);
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$tags[$i-1]['content'] = substr($content, $tags[$i-1]['e'], $tags[$i]['s'] - $tags[$i-1]['e']);
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$tags[$i-1]['e'] = $tags[$i]['e'];
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unset($tags[$i]);
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}
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}
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}
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// Step 3: remove any tags that don't have handlers registered
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// Only do this if self::$error_behavior == self::LEAVE
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// This is optional but speeds things up.
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if(self::$error_behavior == self::LEAVE) {
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foreach($tags as $i => $tag) {
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if(empty($this->shortcodes[$tag['open']])) {
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unset($tags[$i]);
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}
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}
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}
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return array_values($tags);
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}
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/**
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* Replaces the shortcode tags extracted by extractTags with HTML element "markers", so that
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* we can parse the resulting string as HTML and easily mutate the shortcodes in the DOM
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*
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* @param string $content - The HTML string with [tag] style shortcodes embedded
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* @param array $tags - The tags extracted by extractTags
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* @return string - The HTML string with [tag] style shortcodes replaced by markers
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*/
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protected function replaceTagsWithText($content, $tags, $generator) {
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// The string with tags replaced with markers
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$str = '';
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// The start index of the next tag, remembered as we step backwards through the list
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$li = null;
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$i = count($tags);
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while($i--) {
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if ($li === null) $tail = substr($content, $tags[$i]['e']);
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else $tail = substr($content, $tags[$i]['e'], $li - $tags[$i]['e']);
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if ($tags[$i]['escaped']) {
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$str = substr($content, $tags[$i]['s']+1, $tags[$i]['e'] - $tags[$i]['s'] - 2) . $tail . $str;
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}
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else {
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$str = $generator($i, $tags[$i]) . $tail . $str;
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}
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$li = $tags[$i]['s'];
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}
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return substr($content, 0, $tags[0]['s']) . $str;
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}
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/**
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* Replace the shortcodes in attribute values with the calculated content
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*
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* We don't use markers with attributes because there's no point, it's easier to do all the matching
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* in-DOM after the XML parse
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*
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* @param DOMDocument $doc
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*/
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protected function replaceAttributeTagsWithContent($htmlvalue) {
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$attributes = $htmlvalue->query('//@*[contains(.,"[")][contains(.,"]")]');
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$parser = $this;
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for($i = 0; $i < $attributes->length; $i++) {
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$node = $attributes->item($i);
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$tags = $this->extractTags($node->nodeValue);
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$extra = array('node' => $node, 'element' => $node->ownerElement);
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if($tags) {
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$node->nodeValue = $this->replaceTagsWithText($node->nodeValue, $tags,
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function($idx, $tag) use ($parser, $extra) {
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return $parser->getShortcodeReplacementText($tag, $extra, false);
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}
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);
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}
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}
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}
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/**
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* Replace the element-scoped tags with markers
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*
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* @param string $content
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*/
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protected function replaceElementTagsWithMarkers($content) {
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$tags = $this->extractTags($content);
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if($tags) {
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$markerClass = self::$marker_class;
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$content = $this->replaceTagsWithText($content, $tags, function($idx, $tag) use ($markerClass) {
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return '<img class="'.$markerClass.'" data-tagid="'.$idx.'" />';
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});
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}
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return array($content, $tags);
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}
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protected function findParentsForMarkers($nodes) {
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$parents = array();
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foreach($nodes as $node) {
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$parent = $node;
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do {
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$parent = $parent->parentNode;
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}
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while($parent instanceof DOMElement &&
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!in_array(strtolower($parent->tagName), self::$block_level_elements));
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$node->setAttribute('data-parentid', count($parents));
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$parents[] = $parent;
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}
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return $parents;
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}
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const BEFORE = 'before';
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const AFTER = 'after';
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const SPLIT = 'split';
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const INLINE = 'inline';
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/**
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* Given a node with represents a shortcode marker and a location string, mutates the DOM to put the
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* marker in the compliant location
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*
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* For shortcodes inserted BEFORE, that location is just before the block container that
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* the marker is in
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*
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* For shortcodes inserted AFTER, that location is just after the block container that
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* the marker is in
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*
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* For shortcodes inserted SPLIT, that location is where the marker is, but the DOM
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* is split around it up to the block container the marker is in - for instance,
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*
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* <p>A<span>B<marker />C</span>D</p>
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*
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* becomes
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*
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* <p>A<span>B</span></p><marker /><p><span>C</span>D</p>
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*
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* For shortcodes inserted INLINE, no modification is needed (but in that case the shortcode handler needs to
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* generate only inline blocks)
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*
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* @param DOMElement $node
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* @param int $location - ShortcodeParser::BEFORE, ShortcodeParser::SPLIT or ShortcodeParser::INLINE
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*/
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protected function moveMarkerToCompliantHome($node, $parent, $location) {
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// Move before block parent
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if($location == self::BEFORE) {
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if (isset($parent->parentNode))
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$parent->parentNode->insertBefore($node, $parent);
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} else if($location == self::AFTER) {
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// Move after block parent
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$this->insertAfter($node, $parent);
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}
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// Split parent at node
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else if($location == self::SPLIT) {
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$at = $node; $splitee = $node->parentNode;
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while($splitee !== $parent->parentNode) {
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$spliter = $splitee->cloneNode(false);
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$this->insertAfter($spliter, $splitee);
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while($at->nextSibling) {
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$spliter->appendChild($at->nextSibling);
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}
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$at = $splitee; $splitee = $splitee->parentNode;
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}
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$this->insertAfter($node, $parent);
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}
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// Do nothing
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else if($location == self::INLINE) {
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if(in_array(strtolower($node->tagName), self::$block_level_elements)) {
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user_error(
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'Requested to insert block tag '.$node->tagName.
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' inline - probably this will break HTML compliance',
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E_USER_WARNING
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);
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}
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// NOP
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}
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else {
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user_error('Unknown value for $location argument '.$location, E_USER_ERROR);
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}
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}
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/**
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* Given a node with represents a shortcode marker and some information about the shortcode, call the
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* shortcode handler & replace the marker with the actual content
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*
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* @param DOMElement $node
|
|
* @param array $tag
|
|
*/
|
|
protected function replaceMarkerWithContent($node, $tag) {
|
|
$content = $this->getShortcodeReplacementText($tag);
|
|
|
|
if ($content) {
|
|
$parsed = Injector::inst()->create('HTMLValue', $content);
|
|
$body = $parsed->getBody();
|
|
if ($body) $this->insertListAfter($body->childNodes, $node);
|
|
}
|
|
|
|
$this->removeNode($node);
|
|
}
|
|
|
|
/**
|
|
* Parse a string, and replace any registered shortcodes within it with the result of the mapped callback.
|
|
*
|
|
* @param string $content
|
|
* @return string
|
|
*/
|
|
public function parse($content) {
|
|
// If no shortcodes defined, don't try and parse any
|
|
if(!$this->shortcodes) return $content;
|
|
|
|
// If no content, don't try and parse it
|
|
if (!trim($content)) return $content;
|
|
|
|
// First we operate in text mode, replacing any shortcodes with marker elements so that later we can
|
|
// use a proper DOM
|
|
list($content, $tags) = $this->replaceElementTagsWithMarkers($content);
|
|
|
|
$htmlvalue = Injector::inst()->create('HTMLValue', $content);
|
|
|
|
// Now parse the result into a DOM
|
|
if (!$htmlvalue->isValid()){
|
|
if(self::$error_behavior == self::ERROR) {
|
|
user_error('Couldn\'t decode HTML when processing short codes', E_USER_ERRROR);
|
|
}
|
|
else {
|
|
return $content;
|
|
}
|
|
}
|
|
|
|
// First, replace any shortcodes that are in attributes
|
|
$this->replaceAttributeTagsWithContent($htmlvalue);
|
|
|
|
// Find all the element scoped shortcode markers
|
|
$shortcodes = $htmlvalue->query('//img[@class="'.self::$marker_class.'"]');
|
|
|
|
// Find the parents. Do this before DOM modification, since SPLIT might cause parents to move otherwise
|
|
$parents = $this->findParentsForMarkers($shortcodes);
|
|
|
|
foreach($shortcodes as $shortcode) {
|
|
$tag = $tags[$shortcode->getAttribute('data-tagid')];
|
|
$parent = $parents[$shortcode->getAttribute('data-parentid')];
|
|
|
|
$class = null;
|
|
if(!empty($tag['attrs']['location'])) $class = $tag['attrs']['location'];
|
|
else if(!empty($tag['attrs']['class'])) $class = $tag['attrs']['class'];
|
|
|
|
$location = self::INLINE;
|
|
if($class == 'left' || $class == 'right') $location = self::BEFORE;
|
|
if($class == 'center' || $class == 'leftALone') $location = self::SPLIT;
|
|
|
|
if(!$parent) {
|
|
if($location !== self::INLINE) {
|
|
user_error("Parent block for shortcode couldn't be found, but location wasn't INLINE",
|
|
E_USER_ERROR);
|
|
}
|
|
}
|
|
else {
|
|
$this->moveMarkerToCompliantHome($shortcode, $parent, $location);
|
|
}
|
|
|
|
$this->replaceMarkerWithContent($shortcode, $tag);
|
|
}
|
|
|
|
$content = $htmlvalue->getContent();
|
|
|
|
// Clean up any marker classes left over, for example, those injected into <script> tags
|
|
$parser = $this;
|
|
$content = preg_replace_callback(
|
|
// Not a general-case parser; assumes that the HTML generated in replaceElementTagsWithMarkers()
|
|
// hasn't been heavily modified
|
|
'/<img[^>]+class="'.preg_quote(self::$marker_class).'"[^>]+data-tagid="([^"]+)"[^>]+>/i',
|
|
function ($matches) use ($tags, $parser) {
|
|
$tag = $tags[$matches[1]];
|
|
return $parser->getShortcodeReplacementText($tag);
|
|
},
|
|
$content
|
|
);
|
|
|
|
return $content;
|
|
}
|
|
|
|
}
|