上节讲到了模板调用函数，其中调用了模板编译函数。该函数在template.caches.class.php类中定义的。下面讲解一下模板编译函数
/**
* 编译模板
*
* @param $module 模块名称
* @param $template 模板文件名
* @param $istag 是否为标签模板
* @return unknown
*/
public function template_compile($module, $template, $style = 'default') {
if(strpos($module, '/')=== false) {
$tplfile = $_tpl = PC_PATH.'templates'.DIRECTORY_SEPARATOR.$style.DIRECTORY_SEPARATOR.$module.DIRECTORY_SEPARATOR.$template.'.html';
} elseif (strpos($module, 'yp/') !== false) { //黄页模块
$module = str_replace('/', DIRECTORY_SEPARATOR, $module);
$tplfile = $_tpl = PC_PATH.'templates'.DIRECTORY_SEPARATOR.$style.DIRECTORY_SEPARATOR.$module.DIRECTORY_SEPARATOR.$template.'.html';
} else {
$plugin = str_replace('plugin/', '', $module); //插件模板
$module = str_replace('/', DIRECTORY_SEPARATOR, $module);
$tplfile = $_tpl = PC_PATH.'plugin'.DIRECTORY_SEPARATOR.$plugin.DIRECTORY_SEPARATOR.'templates'.DIRECTORY_SEPARATOR.$template.'.html';
}
if ($style != 'default' && !file_exists ( $tplfile )) {
//模板风格不是default，模板文件未指定
//则设置风格为default ，并制定模板文件
$style = 'default';
$tplfile = PC_PATH.'templates'.DIRECTORY_SEPARATOR.'default'.DIRECTORY_SEPARATOR.$module.DIRECTORY_SEPARATOR.$template.'.html';
}
//模板文件不存在
if (! file_exists ( $tplfile )) {
showmessage ( "templates".DIRECTORY_SEPARATOR.$style.DIRECTORY_SEPARATOR.$module.DIRECTORY_SEPARATOR.$template.".html is not exists!" );
}
//将模板文件读入到字符串$content中
$content = @file_get_contents ( $tplfile );
//新建缓存文件路径
/*
* 缓存文件路径
* /caches/caches_template/default/$module/
* */
$filepath = CACHE_PATH.'caches_template'.DIRECTORY_SEPARATOR.$style.DIRECTORY_SEPARATOR.$module.DIRECTORY_SEPARATOR;
//新建文件目录
if(!is_dir($filepath)) {
mkdir($filepath, 0777, true);
}
$compiledtplfile = $filepath.$template.'.php'; //编译的缓存文件
//调用模板解析函数
$content = $this->template_parse($content);
//将字符串$content中的数据写入到文件$compiledtplfile
$strlen = file_put_contents ( $compiledtplfile, $content ); //将获取的内容写到缓存文件
chmod ( $compiledtplfile, 0777 ); //改变文件权限
return $strlen;
}
上面调用到了模板解析函数template_parse(str)
/**
* 解析模板
*
* @param $str 模板内容
* @return ture
*/
public function template_parse($str) {
$str = preg_replace ( "/\{template\s+(.+)\}/", "", $str );
$str = preg_replace ( "/\{include\s+(.+)\}/", "", $str );
$str = preg_replace ( "/\{php\s+(.+)\}/", "", $str );
$str = preg_replace ( "/\{if\s+(.+?)\}/", "", $str );
$str = preg_replace ( "/\{else\}/", "", $str );
$str = preg_replace ( "/\{elseif\s+(.+?)\}/", "", $str );
$str = preg_replace ( "/\{\/if\}/", "", $str );
//for 循环
$str = preg_replace("/\{for\s+(.+?)\}/","",$str);
$str = preg_replace("/\{\/for\}/","",$str);
//++ --
$str = preg_replace("/\{\+\+(.+?)\}/","",$str);
$str = preg_replace("/\{\-\-(.+?)\}/","",$str);
$str = preg_replace("/\{(.+?)\+\+\}/","",$str);
$str = preg_replace("/\{(.+?)\-\-\}/","",$str);
$str = preg_replace ( "/\{loop\s+(\S+)\s+(\S+)\}/", "", $str );
$str = preg_replace ( "/\{loop\s+(\S+)\s+(\S+)\s+(\S+)\}/", " \\3) { ?>", $str );
$str = preg_replace ( "/\{\/loop\}/", "", $str );
$str = preg_replace ( "/\{([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff:]*\(([^{}]*)\))\}/", "", $str );
$str = preg_replace ( "/\{\\$([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff:]*\(([^{}]*)\))\}/", "", $str );
$str = preg_replace ( "/\{(\\$[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)\}/", "", $str );
$str = preg_replace("/\{(\\$[a-zA-Z0-9_\[\]\'\"\$\x7f-\xff]+)\}/es", "\$this->addquote('')",$str);
$str = preg_replace ( "/\{([A-Z_\x7f-\xff][A-Z0-9_\x7f-\xff]*)\}/s", "", $str );
$str = preg_replace("/\{pc:(\w+)\s+([^}]+)\}/ie", "self::pc_tag('$1','$2', '$0')", $str);
$str = preg_replace("/\{\/pc\}/ie", "self::end_pc_tag()", $str);
$str = "" . $str;
return $str;
}
另外在附上模板缓存更新函数
/**
* 更新模板缓存
*
* @param $tplfile 模板原文件路径
* @param $compiledtplfile 编译完成后，写入文件名
* @return $strlen 长度
*/
public function template_refresh($tplfile, $compiledtplfile) {
$str = @file_get_contents ($tplfile);
$str = $this->template_parse ($str);
$strlen = file_put_contents ($compiledtplfile, $str );
chmod ($compiledtplfile, 0777);
return $strlen;
}
改函数使用了大量的正则表达式，主要是用来处理模板文件中使用到的标签，将之转换为php代码。