<?php
/**
 * ThinkPHP标签库TagLib解析基类.
 *
 * @author e启学束
 *
 * @version   $Id$
 */
class TagLib
{
    //类定义开始

    /**
     * 标签库定义XML文件.
     *
     * @var string
     */
    protected $xml = '';

    /**
     * 标签库名称.
     *
     * @var string
     */
    protected $tagLib = '';

    /**
     * 标签库标签列表.
     *
     * @var string
     */
    protected $tagList = array();

    /**
     * 标签库分析数组.
     *
     * @var string
     */
    protected $parse = array();

    /**
     * 标签库是否有效.
     *
     * @var string
     */
    protected $valid = false;

    /**
     * 当前模板对象
     *
     * @var object
     */
    protected $tpl;

    protected $comparison = array(' nheq ' => ' !== ', ' heq ' => ' === ', ' neq ' => ' != ', ' eq ' => ' == ', ' egt ' => ' >= ', ' gt ' => ' > ', ' elt ' => ' <= ', ' lt ' => ' < ');

    /**
     * 架构函数.
     */
    public function __construct()
    {
        $this->tagLib = strtolower(substr(get_class($this), 6));
        $this->tpl = Template::getInstance(); //ThinkTemplate::getInstance();
        $this->_initialize();
        $this->load();
    }

    /**
     * 初始化标签库的定义文件.
     */
    public function _initialize()
    {
        $this->xml = dirname(__FILE__).'/TagLib/'.$this->tagLib.'.xml';
    }

    /**
     * 载入模板文件.
     */
    public function load()
    {
        $xml = file_get_contents($this->xml);
        $array = (array) (simplexml_load_string($xml));
        if ($array !== false) {
            $this->parse = $array;
            $this->valid = true;
        } else {
            $this->valid = false;
        }
    }

    /**
     * 分析TagLib文件的信息是否有效
     * 有效则转换成数组.
     *
     * @param mixed  $name  数据
     * @param string $value 数据表名
     *
     * @return string
     */
    public function valid()
    {
        return $this->valid;
    }

    /**
     * 获取TagLib名称.
     *
     * @return string
     */
    public function getTagLib()
    {
        return $this->tagLib;
    }

    /**
     * 获取Tag列表.
     *
     * @return string
     */
    public function getTagList()
    {
        if (empty($this->tagList)) {
            $tags = $this->parse['tag'];
            $list = array();
            if (is_object($tags)) {
                $list[] = array(
                    'name'      => $tags->name,
                    'content'   => $tags->bodycontent,
                    'nested'    => (!empty($tags->nested) && $tags->nested != 'false') ? $tags->nested : 0,
                    'attribute' => isset($tags->attribute) ? $tags->attribute : '',
                    );
                if (isset($tags->alias)) {
                    $alias = explode(',', $tag->alias);
                    foreach ($alias as $tag) {
                        $list[] = array(
                            'name'      => $tag,
                            'content'   => $tags->bodycontent,
                            'nested'    => (!empty($tags->nested) && $tags->nested != 'false') ? $tags->nested : 0,
                            'attribute' => isset($tags->attribute) ? $tags->attribute : '',
                            );
                    }
                }
            } else {
                foreach ($tags as $tag) {
                    $tag = (array) $tag;
                    $list[] = array(
                        'name'      => $tag['name'],
                        'content'   => $tag['bodycontent'],
                        'nested'    => (!empty($tag['nested']) && $tag['nested'] != 'false') ? $tag['nested'] : 0,
                        'attribute' => isset($tag['attribute']) ? $tag['attribute'] : '',
                        );
                    if (isset($tag['alias'])) {
                        $alias = explode(',', $tag['alias']);
                        foreach ($alias as $tag1) {
                            $list[] = array(
                                'name'      => $tag1,
                                'content'   => $tag['bodycontent'],
                                'nested'    => (!empty($tag['nested']) && $tag['nested'] != 'false') ? $tag['nested'] : 0,
                                'attribute' => isset($tag['attribute']) ? $tag['attribute'] : '',
                                );
                        }
                    }
                }
            }
            $this->tagList = $list;
        }

        return $this->tagList;
    }

    /**
     * 获取某个Tag属性的信息.
     *
     * @return string
     */
    public function getTagAttrList($tagName)
    {
        static $_tagCache = array();
        $_tagCacheId = md5($this->tagLib.$tagName);
        if (isset($_tagCache[$_tagCacheId])) {
            return $_tagCache[$_tagCacheId];
        }
        $list = array();
        $tags = $this->parse['tag'];
        foreach ($tags as $tag) {
            $tag = (array) $tag;
            if (strtolower($tag['name']) == strtolower($tagName)) {
                if (isset($tag['attribute'])) {
                    if (is_object($tag['attribute'])) {
                        // 只有一个属性
                        $attr = $tag['attribute'];
                        $list[] = array(
                            'name'     => $attr->name,
                            'required' => $attr->required,
                            );
                    } else {
                        // 存在多个属性
                        foreach ($tag['attribute'] as $attr) {
                            $attr = (array) $attr;
                            $list[] = array(
                                'name'     => $attr['name'],
                                'required' => $attr['required'],
                                );
                        }
                    }
                }
            }
        }
        $_tagCache[$_tagCacheId] = $list;

        return $list;
    }

    /**
     * TagLib标签属性分析 返回标签属性数组.
     *
     * @param string $tagStr 标签内容
     *
     * @return array
     */
    public function parseXmlAttr($attr, $tag)
    {
        //XML解析安全过滤
        $attr = str_replace(array('&', 'THEME_PATH', 'APP_TPL_PATH'), array('___', THEME_PATH, APP_TPL_PATH), $attr);
        $xml = '<tpl><tag '.$attr.' /></tpl>';
        $xml = simplexml_load_string($xml);
        if (!$xml) {
            throw_exception(L('_XML_TAG_ERROR_').' : '.$attr);
        }
        $xml = (array) ($xml->tag->attributes());
        $array = array_change_key_case($xml['@attributes']);
        $attrs = $this->getTagAttrList($tag);
        foreach ($attrs as $val) {
            $name = strtolower($val['name']);
            if (!isset($array[$name])) {
                $array[$name] = '';
            } else {
                $array[$name] = str_replace('___', '&', $array[$name]);
            }
        }

        return $array;
    }

    /**
     * 解析条件表达式.
     *
     * @param string $condition 表达式标签内容
     *
     * @return array
     */
    public function parseCondition($condition)
    {
        $condition = str_ireplace(array_keys($this->comparison), array_values($this->comparison), $condition);
        $condition = preg_replace('/\$(\w+):(\w+)\s/is', '$\\1->\\2 ', $condition);
        switch (strtolower(C('TMPL_VAR_IDENTIFY'))) {
            case 'array': // 识别为数组
                $condition = preg_replace('/\$(\w+)\.(\w+)\s/is', '$\\1["\\2"] ', $condition);
                break;
            case 'obj':  // 识别为对象
                $condition = preg_replace('/\$(\w+)\.(\w+)\s/is', '$\\1->\\2 ', $condition);
                break;
            default:  // 自动判断数组或对象 只支持二维
                $condition = preg_replace('/\$(\w+)\.(\w+)\s/is', '(is_array($\\1)?$\\1["\\2"]:$\\1->\\2) ', $condition);
        }

        return $condition;
    }

    /**
     * 自动识别构建变量.
     *
     * @param string $name 变量描述
     *
     * @return string
     */
    public function autoBuildVar($name)
    {
        if ('Think.' == substr($name, 0, 6)) {
            // 特殊变量
            return $this->parseThinkVar($name);
        } elseif (strpos($name, '.')) {
            $vars = explode('.', $name);
            $var = array_shift($vars);
            switch (strtolower(C('TMPL_VAR_IDENTIFY'))) {
                case 'array': // 识别为数组
                    $name = '$'.$var;
                    foreach ($vars as $key => $val) {
                        if (0 === strpos($val, '$')) {
                            $name .= '["{'.$val.'}"]';
                        } else {
                            $name .= '["'.$val.'"]';
                        }
                    }
                    break;
                case 'obj':  // 识别为对象
                    $name = '$'.$var;
                    foreach ($vars as $key => $val) {
                        $name .= '->'.$val;
                    }
                    break;
                default:  // 自动判断数组或对象 只支持二维
                    $name = 'is_array($'.$var.')?$'.$var.'["'.$vars[0].'"]:$'.$var.'->'.$vars[0];
            }
        } elseif (strpos($name, ':')) {
            // 额外的对象方式支持
            $name = '$'.str_replace(':', '->', $name);
        } elseif (!defined($name)) {
            $name = '$'.$name;
        }

        return $name;
    }

    /**
     * 用于标签属性里面的特殊模板变量解析
     * 格式 以 Think. 打头的变量属于特殊模板变量.
     *
     * @param string $varStr 变量字符串
     *
     * @return string
     */
    public function parseThinkVar($varStr)
    {
        $vars = explode('.', $varStr);
        $vars[1] = strtoupper(trim($vars[1]));
        $parseStr = '';
        if (count($vars) >= 3) {
            $vars[2] = trim($vars[2]);
            switch ($vars[1]) {
                case 'SERVER':    $parseStr = '$_SERVER[\''.$vars[2].'\']'; break;
                case 'GET':         $parseStr = '$_GET[\''.$vars[2].'\']'; break;
                case 'POST':       $parseStr = '$_POST[\''.$vars[2].'\']'; break;
                case 'COOKIE':    $parseStr = '$_COOKIE[\''.$vars[2].'\']'; break;
                case 'SESSION':   $parseStr = '$_SESSION[\''.$vars[2].'\']'; break;
                case 'ENV':         $parseStr = '$_ENV[\''.$vars[2].'\']'; break;
                case 'REQUEST':  $parseStr = '$_REQUEST[\''.$vars[2].'\']'; break;
                case 'CONST':     $parseStr = strtoupper($vars[2]); break;
                case 'LANG':       $parseStr = 'L("'.$vars[2].'")'; break;
                case 'CONFIG':    $parseStr = 'C("'.$vars[2].'")'; break;
            }
        } elseif (count($vars) == 2) {
            switch ($vars[1]) {
                case 'NOW':       $parseStr = "date('Y-m-d g:i a',time())"; break;
                case 'VERSION':  $parseStr = 'THINK_VERSION'; break;
                case 'TEMPLATE':$parseStr = 'C("TMPL_FILE_NAME")'; break;
                case 'LDELIM':    $parseStr = 'C("TMPL_L_DELIM")'; break;
                case 'RDELIM':    $parseStr = 'C("TMPL_R_DELIM")'; break;
                default:  if (defined($vars[1])) {
                    $parseStr = $vars[1];
                }
            }
        }

        return $parseStr;
    }
}//类定义结束
