Dedecms模板原理与标签替换实现

<?php
require_once(dirname(__FILE__) . "/../include/common.inc.php");

// 1. 读入模板文件
$str = file_get_contents('test.html');

// 2. 使用正则匹配出页面中所有的 arclist 标签
$re = '/{dede:arclist(.*)}(.*){\\\\/dede:arclist}/Us';
preg_match_all($re, $str, $a);

// 3. 循环每一个匹配到的arclist标签进行处理
foreach ($a[0] as $k => $v) {
    // 处理标签：根据标签上的属性构造一个SQL语句
    $attrArr = strToArray($a[1][$k]);

    if (isset($attrArr['row'])) {
        $limit = $attrArr['row'];
    } else {
        $limit = 20;
    }

    if (isset($attrArr['orderby'])) {
        $orderby = $attrArr['orderby'];
    } else {
        $orderby = 'id';
    }

    if (isset($attrArr['orderway'])) {
        $orderway = $attrArr['orderway'];
    } else {
        $orderway = 'desc';
    }

    if (isset($attrArr['channelid'])) {
        $leftJoin = ' LEFT JOIN dede_addon17 b ON a.id=b.aid ';
    } else {
        $leftJoin = '';
    }

    if (isset($attrArr['addfields'])) {
        $extraFields = ',' . $attrArr['addfields'];
    } else {
        $extraFields = '';
    }

    $sql = "SELECT a.*$extraFields FROM dede_archives a $leftJoin ORDER BY $orderby $orderway LIMIT $limit";
    $dsql->Execute('me', $sql);
    $html = '';

    while ($row = $dsql->GetArray('me')) {
        $_tep = $a[2][$k];
        $_re = '/\\\\[field:(\\\\w+)(\\\\s+function=("|\\\\\\')(\\\\w+)\\\\((.*)\\\\)\\\\3)?\\\\/\\\\]/U';
        preg_match_all($_re, $_tep, $_a);

        foreach ($_a[0] as $_k => $_v) {
            if ($_a[4][$_k] == '') {
                $_tep = str_replace($_v, $row[$_a[1][$_k]], $_tep);
            } else {
                $_a[5][$_k] = str_replace('@me', $row[$_a[1][$_k]], $_a[5][$_k]);
                $funStr = '$_val=' . $_a[4][$_k] . "({$_a[5][$_k]});";
                eval($funStr);
                $_tep = str_replace($_v, $_val, $_tep);
            }
        }
        $html .= $_tep;
    }

    $str = str_replace($v, $html, $str);
}

file_put_contents('./index.html', $str);
echo '解析成功!';

function strToArray($str) {
    $str = trim($str);
    $re = '/[a-z]+\\\\s*=\\\\s*("|\\\\\\').*\\\\1/U';
    $data = array();
    preg_match_all($re, $str, $a);

    foreach ($a[0] as $k => $v) {
        $_a = explode('=', $v);
        $_a[1] = ltrim($_a[1], $a[1][$k]);
        $_a[1] = rtrim($_a[1], $a[1][$k]);
        $data[$_a[0]] = $_a[1];
    }

    return $data;
}
?>