Typecho短代码解析功能实现

WordPress短代码是一种非常简单的可以给WordPress文章、页面以及侧边栏添加动态内容的方式。许多WordPress插件和主题都会使用短代码去添加特定的内容，例如联系表单、图集、幻灯片等。

这篇文章，会为你展示如何让Typecho像WordPress一样添加短代码以及创建自己的自定义短代码。

在functions.php加入

<?php
class Content{
    public static function analysis($content)
    {
        /** 
         * 提高效率，避免每篇文章都要解析
        **/
        if (strpos($content, '[scode') !== false) {
            $pattern = self::get_shortcode_regex(array('scode'));
            $content = preg_replace_callback("/$pattern/", array('Content', 'scodeParseCallback'),
                $content);
        }
        return $content;
    }
    /**
     * 短代码解析正则替换回调函数
     * @param $matches
     * @return bool|string
     * 
     * 使用：[scode type="share"]这是灰色的短代码框，常用来引用资料什么的[/scode]
     */
    public static function scodeParseCallback($matches)
    {
        // 不解析类似 [[player]] 双重括号的代码
        if ($matches[1] == '[' && $matches[6] == ']') {
            return substr($matches[0], 1, -1);
        }
        //[scode type="share"]这是灰色的短代码框，常用来引用资料什么的[/scode]
        $attr = htmlspecialchars_decode($matches[3]);//还原转义前的参数列表
        $attrs = self::shortcode_parse_atts($attr);//获取短代码的参数
        $type = "info";
        switch ($attrs['type']) {
            case 'yellow':
                $type = "warning";
                break;
            case 'red':
                $type = "error";
                break;
            case 'lblue':
                $type = "info";
                break;
            case 'green':
                $type = "success";
                break;
            case 'share':
                $type = "share";
                break;
        }
        return '<div class="tip inlineBlock ' . $type . '">' . $matches[5] . '</div>';
    }
    /**************下面是解析功能区域，搬WordPress的，无需改动***************************/
    /**
     * 获取匹配短代码的正则表达式
     * @param null $tagnames
     * @return string
     * @link https://github.com/WordPress/WordPress/blob/master/wp-includes/shortcodes.php#L254
     */
    public static function get_shortcode_regex($tagnames = null)
    {
        global $shortcode_tags;
        if (empty($tagnames)) {
            $tagnames = array_keys($shortcode_tags);
        }
        $tagregexp = join('|', 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
    }
    /**
     * @param $text
     * @return array|string
     * @link https://github.com/WordPress/WordPress/blob/master/wp-includes/shortcodes.php#L508
     */
    public static function shortcode_parse_atts($text)
    {
        $atts = array();
        $pattern = self::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 (false !== strpos($value, '<')) {
                    if (1 !== preg_match('/^[^<]*+(?:<[^>]*+>[^<]*+)*+$/', $value)) {
                        $value = '';
                    }
                }
            }
        } else {
            $atts = ltrim($text);
        }
        return $atts;
    }

    /**
     * Retrieve the shortcode attributes regex.
     *
     * @return string The shortcode attribute regular expression
     * @since 4.4.0
     *
     */
    public static function get_shortcode_atts_regex()
    {
        return '/([\w-]+)\s*=\s*"([^"]*)"(?:\s|$)|([\w-]+)\s*=\s*\'([^\']*)\'(?:\s|$)|([\w-]+)\s*=\s*([^\s\'"]+)(?:\s|$)|"([^"]*)"(?:\s|$)|\'([^\']*)\'(?:\s|$)|(\S+)(?:\s|$)/';
    }



}

继续在functions.php加入

//短代码解析
function shortCode($content){
    //解析短代码功能
    $cons = new Content();
    
    $content = $cons->analysis($content);
    
    return  $content;
}

在post.php或者你要解析的地方加上shortCode(内容)即可;