Javascript模板技术

/***Template.class.js***/

function Template()
{
this.classname="Template";
this.debug=false;
this.file=new HashMap();
this.root="";
this.varkeys=new HashMap();
this.varvals=new HashMap();
this.unknowns="remove";
this.halt_on_error="yes";
this.last_error="";
this.fso=new ActiveXObject("Scripting.FileSystemObject");
this.set_root=_set_root;
this.set_unknowns=_set_unknowns;
this.get_var=_get_var;
this.set_file=_set_file;
this.set_var=_set_var;
this.set_block=_set_block;
this.subst=_subst;
this.parse=_parse;
this.p=_p;
this.pparse=_pparse;
this.finish=_finish;
this.loadfile=_loadfile;
this.is_dir=_is_dir;
this.file_exists=_file_exists;
this.filename=_filename;
this.varname=_varname;
this.halt=_halt;
this.haltmsg=_haltmsg;
}

/**
* 设置模板文件根目录
* @param root
*/
function _set_root(root)
{
if(!this.is_dir(root))
{
this.halt("set_root:" root " is not a directory.");
}
this.root=root;
}

/**
* 设定对未知模板变量的处理办法
* @param unknowns
*/
function _set_unknowns(unknowns)
{
this.unknowns=unknowns;
}

/**
* 设定模板文件
* @param handle
* @param filename
*/
function _set_file(handle,filename)
{
this.file.put(handle,this.filename(filename));
}

/**
* 设定模板变量
* @param varname
* @param value
*/
function _set_var(varname,value)
{
if(!this.varkeys.containsKey(varname))
{
this.varkeys.put(varname,this.varname(varname));
}
if(!this.varvals.containsKey(varname))
{
this.varvals.put(varname,value);
}
else
{
this.varvals.remove(varname);
this.varvals.put(varname,value);
}
//alert(varname "==================" value);
}

/**
* 设定块变量
* @param parent
* @param handle
* @param name
*/
function _set_block(parent,handle,name)
{
if(!this.loadfile(parent))
{
this.halt("subst:unable to load " parent);
}
if(name=="")
{
name=handle;
}
var str=this.get_var(parent);
var re=new RegExp("<!--\\s BEGIN " handle "\\s -->([\\s\\S.]*)<!--\\s END " handle "\\s -->");
//Matcher m=p.matcher(str);
//var rs=m.find();
//var t=m.group(m.groupCount());
//this.set_var(handle,t);
var arr=re.exec(str);
if(arr!=null)
this.set_var(handle,RegExp.$1);
str=str.replace(re,"{" name "}");
this.set_var(parent,str);
}

/**
* 进行变量替换
* @param handle
* @return
*/
function _subst(handle)
{
if(!this.loadfile(handle))
{
this.halt("subst:unable to load " handle);
}
var str=this.get_var(handle);
var keys=this.varkeys.keySet();
//alert(keys.length);
for(var i=0;i<keys.length;i )
{
var key=keys[i];
var re=new RegExp(this.varkeys.get(key),"g")
str=str.replace(re,this.varvals.get(key));
}
//alert(handle " " str);
return str;
}

/**
* 进行变量复制
* @param target
* @param handle
* @param append
*/
function _parse(target,handle,append)
{
var str=this.subst(handle);
if(append)
{
this.set_var(target,this.get_var(target) str);
}
else
{
this.set_var(target,str);
}
}

/**
* 返回替换后的文件
* @param varname
* @return
*/
function _p(varname)
{
return this.finish(this.get_var(varname));
}

/**
* parse()和p()的合并
* @param target
* @param handle
* @param append
* @return
*/
function _pparse(target,handle,append)
{
this.parse(target,handle,append);
document.writeln(this.p(target));
}

/**
* 加载模板文件
* @param handle
* @return
*/
function _loadfile(handle)
{
if(this.varkeys.containsKey(handle) && this.varvals.get(handle)!=null)
{
return true;
}
if(!this.file.containsKey(handle))
{
_halt("loadfile:" handle " is not a valid handle.");
return false;
}
var filename=this.file.get(handle);
if(!this.file_exists(filename))
{
this.halt("loadfile:while loading " handle "," filename " does not exist.");
return false;
}
try
{
var fr=this.fso.OpenTextFile(filename);
var s=fr.ReadAll();
if(s=="")
{
halt("loadfile:while loading " handle "," filename " is empty.");
return false;
}
this.set_var(handle,s);
}
catch(e)
{

}
return true;
}

/**
* 获取变量
* @param varname
* @return
*/
function _get_var(varname)
{
if(this.varvals.containsKey(varname))
return this.varvals.get(varname);
else
return "";
}

/**
* 判断目录
* @param path
* @return
*/
function _is_dir(path)
{
if(this.fso.FolderExists(path))
return true;

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