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phplib 7.4 Template模板类中文详解

© kekehu / 技术资源 / 2006.05.19 / 09:54 / 15379PV



/*这里是函数set_root*/
function set_root($root)
{
if ($this->debug & 4)
{
echo "<p><b>设置根目录:</b> root = $root</p>\n";
}
if (!is_dir($root))
{
$this->halt("设置根目录: $root 不是一个无效的目录.");
return false;
}
$this->root = $root;
return true;
}


//这里是函数set_unknowns,即对未知变量的处理
function set_unknowns($unknowns = "remove")
{
if ($this->debug & 4)
{
echo "<p><b>未知的:</b> 未知 = $unknowns</p>\n";
}
$this->unknowns = $unknowns;
}



/*这里是函数set_file.......................................................*/
//该方法在数组file中根据$varname提供的键名加入值
function set_file($varname, $filename = "")
{
if (!is_array($varname))//如果varname是数组
{
if ($this->debug & 4)
{
echo "<p><b>设置文件:</b> (with scalar) varname = $varname, filename = $filename</p>\n";
}
if ($filename == "")//如果文件名为空,输出错误
{
$this->halt("设置文件:变量名 $varname 文件名是空的.");
return false;
}
$this->file[$varname] = $this->filename($filename);
}
else
{
reset($varname);//将varname的键名作为file数组的键名
//将键名对应的值作为file数组的值
while(list($v, $f) = each($varname))
{
if ($this->debug & 4)
{
echo "<p><b>set_file:</b> (with array) varname = $v, filename = $f</p>\n";
}
if ($f == "")
{
$this->halt("set_file: For varname $v filename is empty.");
return false;
}
$this->file[$v] = $this->filename($f);
}
}
return true;
}


//该方法取出某个父模板文件中的一个子模板
//将其作为块来加载
//并用另外一个模板变量取代之
/* public: set_file(array $filelist)
* comment: 设置多个模板文件
* filelist: (句柄,文件名)数组
* public: set_file(string $handle, string $filename)
* comment: 设置一个模板文件
* handle: 文件的句柄
* filename: 模板文件名
*/
function set_block($parent, $varname, $name = "") {
if ($this->debug & 4) {
echo "<p><b>set_block:</b> parent = $parent, varname = $varname, name = $name</p>\n";
}
if (!$this->loadfile($parent)) {
$this->halt("set_block: unable to load $parent.");
return false;
}
if ($name == "") {
$name = $varname;//如果没有指定模板变量的值就用子模板名作为模板变量名
}

$str = $this->get_var($parent);
$reg = "/[ \t]*<!--\s+BEGIN $varname\s+-->\s*?\n?(\s*.*?\n?)\s*<!--\s+END $varname\s+-->\s*?\n?/sm";
preg_match_all($reg, $str, $m);
$str = preg_replace($reg, "{ " . "$name }", $str);
$this->set_var($varname, $m[1][0]);
$this->set_var($parent, $str);
return true;
}


//该方法向Varname和varkeys数组中添加新的键一值对
/* public: set_var(array $values)
* values: (变量名,值)数组
* public: set_var(string $varname, string $value)
* varname: 将被定义的变量名
* value: 变量的值
*/
function set_var($varname, $value = "", $append = false) {
if (!is_array($varname))//如果不是阵列
{
if (!empty($varname)) //如果是空的
{
if ($this->debug & 1) {
printf("<b>set_var:</b> (with scalar) <b>%s</b> = '%s'<br>\n", $varname, htmlentities($value));
}
$this->varkeys[$varname] = "/".$this->varname($varname)."/";
if ($append && isset($this->varvals[$varname])) {
$this->varvals[$varname] .= $value;
} else {
$this->varvals[$varname] = $value;
}
}
} else {
reset($varname);
while(list($k, $v) = each($varname)) {
if (!empty($k)) {
if ($this->debug & 1) {
printf("<b>set_var:</b> (with array) <b>%s</b> = '%s'<br>\n", $k, htmlentities($v));
}
$this->varkeys[$k] = "/".$this->varname($k)."/";
if ($append && isset($this->varvals[$k])) {
$this->varvals[$k] .= $v;
} else {
$this->varvals[$k] = $v;
}
}
}
}
}


//定义函数clear_var
function clear_var($varname) {
if (!is_array($varname))//如果varname不是阵列
{
if (!empty($varname)) //如果是空的
{
if ($this->debug & 1) {
printf("<b>clear_var:</b> (with scalar) <b>%s</b><br>\n", $varname);
}
$this->set_var($varname, "");
}
} else {
reset($varname);
while(list($k, $v) = each($varname)) {
if (!empty($v)) {
if ($this->debug & 1) {
printf("<b>clear_var:</b> (with array) <b>%s</b><br>\n", $v);
}
$this->set_var($v, "");
}
}
}
}



/*这里是函数unset_var,删除变量的定义*/
function unset_var($varname) {
if (!is_array($varname)) {
if (!empty($varname)) {
if ($this->debug & 1) {
printf("<b>unset_var:</b> (with scalar) <b>%s</b><br>\n", $varname);
}
unset($this->varkeys[$varname]);
unset($this->varvals[$varname]);
}
} else {
reset($varname);
while(list($k, $v) = each($varname)) {
if (!empty($v)) {
if ($this->debug & 1) {
printf("<b>unset_var:</b> (with array) <b>%s</b><br>\n", $v);
}
unset($this->varkeys[$v]);
unset($this->varvals[$v]);
}
}
}
}



//将模板文件中的变化内容替换成确定内容的操作,实现数据和显示的分离
function subst($varname) {
$varvals_quoted = array();
if ($this->debug & 4) {
echo "<p><b>subst:</b> varname = $varname</p>\n";
}
if (!$this->loadfile($varname)) //装载模板文件,如果出错就停止
{
$this->halt("subst: unable to load $varname.");
return false;
}

reset($this->varvals);
while(list($k, $v) = each($this->varvals)) {
$varvals_quoted[$k] = preg_replace(array('/\\\\/', '/\$/'), array('\\\\\\', '\\\\$'), $v);
}

//读入文件内容到字符串中并在下行对已知键值进行替换并返回结果
$str = $this->get_var($varname);
$str = preg_replace($this->varkeys, $varvals_quoted, $str);
return $str;
}


//同subst,只是直接输出结果
function psubst($varname) {
if ($this->debug & 4) {
echo "<p><b>psubst:</b> varname = $varname</p>\n";
}
print $this->subst($varname);

return false;
}


//将varname代表的一个或多个文件中的内容完成替换
//存放在target为键值的varvals数组无素中或追加到其后
//返回值和sub相同
function parse($target, $varname, $append = false) {
if (!is_array($varname)) {
if ($this->debug & 4) {
echo "<p><b>parse:</b> (with scalar) target = $target, varname = $varname, append = $append</p>\n";
}
$str = $this->subst($varname);
if ($append) {
$this->set_var($target, $this->get_var($target) . $str);
} else {
$this->set_var($target, $str);
}
} else {
reset($varname);
while(list($i, $v) = each($varname)) {
if ($this->debug & 4) {
echo "<p><b>parse:</b> (with array) target = $target, i = $i, varname = $v, append = $append</p>\n";
}
$str = $this->subst($v);
if ($append) {
$this->set_var($target, $this->get_var($target) . $str);
} else {
$this->set_var($target, $str);
}
}
}

if ($this->debug & 4) {
echo "<p><b>parse:</b> completed</p>\n";
}
return $str;
}


//同parse方法,只是该方法将结果输出
function pparse($target, $varname, $append = false) {
if ($this->debug & 4) {
echo "<p><b>pparse:</b> passing parameters to parse...</p>\n";
}
print $this->finish($this->parse($target, $varname, $append));
return false;
}


//返回所有的键一值对中的值所组成的数组
function get_vars() {
if ($this->debug & 4) {
echo "<p><b>get_vars:</b> constructing array of vars...</p>\n";
}
reset($this->varkeys);
while(list($k, $v) = each($this->varkeys)) {
$result[$k] = $this->get_var($k);
}
return $result;
}


//根据键名返回对应的键一值勤对应的值
function get_var($varname) {
if (!is_array($varname)) //如果不是阵列
{
if (isset($this->varvals[$varname])) //如果变量不存在
{
$str = $this->varvals[$varname];
} else {
$str = "";
}
if ($this->debug & 2) {
printf ("<b>get_var</b> (with scalar) <b>%s</b> = '%s'<br>\n", $varname, htmlentities($str));
}
return $str;
} else {
reset($varname);
while(list($k, $v) = each($varname)) {
if (isset($this->varvals[$v])) {
$str = $this->varvals[$v];
} else {
$str = "";
}
if ($this->debug & 2) {
printf ("<b>get_var:</b> (with array) <b>%s</b> = '%s'<br>\n", $v, htmlentities($str));
}
$result[$v] = $str;
}
return $result;
}
}



//如果加载文件失败,返回错误并停止
function get_undefined($varname) {
if ($this->debug & 4) {
echo "<p><b>get_undefined:</b> varname = $varname</p>\n";
}
if (!$this->loadfile($varname)) {
$this->halt("get_undefined: unable to load $varname.");
return false;
}

preg_match_all("/{ ([^ \t\r\n }]+) }/", $this->get_var($varname), $m);
$m = $m[1];
//如果无法找到匹配的文本,返回错误
if (!is_array($m)) {
return false;
}
//如果能找到大括号中的非空字符,则将其值作为键值,组成一个新的数组
reset($m);
while(list($k, $v) = each($m)) {
if (!isset($this->varkeys[$v])) {
if ($this->debug & 4) {
echo "<p><b>get_undefined:</b> undefined: $v</p>\n";
}
$result[$v] = $v;
}
}
//如是该数组不为空就返回该数组,否则就返回错误
if (count($result)) {
return $result;
} else {
return false;
}
}


//完成对str的最后的处理工作,利用类的属性unknowns来确定对模板中无法处理的动态部分的处理方法
function finish($str) {
switch ($this->unknowns) {
case "keep": //保持不变
break;

case "remove": //删除所有的非控制符
$str = preg_replace('/{ [^ \t\r\n }]+ }/', "", $str);
break;

case "comment"://将大括号中的HTML注释
$str = preg_replace('/{ ([^ \t\r\n }]+) }/', "<!-- Template variable \\1 undefined -->", $str);
break;
}

return $str;
}


//将参数变量对诮的数组中的值处理后输出
function p($varname) {
print $this->finish($this->get_var($varname));
}


//将参数变量对应的数组中的值处理后返回
function get($varname) {
return $this->finish($this->get_var($varname));
}


//检查并补充给定的文件名

function filename($filename) {
if ($this->debug & 4) {
echo "<p><b>filename:</b> filename = $filename</p>\n";
}
if (substr($filename, 0, 1) != "/")
//如果文件名不是以斜杠开头,则表示是相对路径,将其补充为完整的绝对路径
{
$filename = $this->root."/".$filename;
}
//如果文件不存在
if (!file_exists($filename)) {
$this->halt("filename: file $filename does not exist.");
}
return $filename;//返回文件名
}


//对变量名进行处理,将正则表达式中的敏感字符变为转义字符,并在变量名两端加上大括号
function varname($varname) {
return preg_quote("{ ".$varname." }");
}


//该方法根据varname加载文件到键一值对中
function loadfile($varname) {
if ($this->debug & 4) {
echo "<p><b>loadfile:</b> varname = $varname</p>\n";
}

if (!isset($this->file[$varname])) //如果没有指定就返加错误
{
// $varname does not reference a file so return
if ($this->debug & 4) {
echo "<p><b>loadfile:</b> varname $varname does not reference a file</p>\n";
}
return true;
}

if (isset($this->varvals[$varname]))//如果已经加载了varname为名柄的文件,直接返回真值
{
if ($this->debug & 4) {
echo "<p><b>loadfile:</b> varname $varname is already loaded</p>\n";
}
return true;
}
$filename = $this->file[$varname];//句柄有效则取出对应的文件名
$str = implode("", @file($filename));//将文件的每一行连接成一个字符串
if (empty($str)) //字符串空说明文件空或者不存在,返回错误
{
$this->halt("loadfile: While loading $varname, $filename does not exist or is empty.");
return false;
}
if ($this->debug & 4) {
printf("<b>loadfile:</b> loaded $filename into $varname<br>\n");
}
$this->set_var($varname, $str);//如果文件不为空,用$varname作为句柄,str为变量名
//向键值对中添加新的键值

return true;
}

//将分析结果保存到文件中去
 function savetofile ($dir,$varname){
  $data=$this->finish($this->get_var($varname));
  $fp=fopen($dir,"w+");
  fwrite($fp,$data);
 }


 //清除已赋值数组
  function renew(){
   $this->varkeys=array();
   $this->varvals=array();
   $this->file=array();
   }


//出错提示并终止程序运行
function halt($msg) {
$this->last_error = $msg;

if ($this->halt_on_error != "no") {
$this->haltmsg($msg);
}

if ($this->halt_on_error == "yes") {
die("<b>终止.</b>");
}

return false;
}


//出错提示
function haltmsg($msg) {
printf("<b>模板错误:</b> %s<br>\n", $msg);
}

}
?>



/*

*文章来源:www.edong.org
* PHPlib模板7.4中文版

* &copy; Copyright 1999-2000 NetUSE GmbH
* Kristian Koehntopp
* 彭赞群注释于2004年6月,QQ:9537075 TEL:13787877670
* Email:mylovepzq@163.com
*/
[/code]
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