package org.nutz.el.parse;
import org.nutz.el.Parse;
import org.nutz.el.obj.AbstractObj;
import org.nutz.el.obj.IdentifierObj;
/**
* 标识符转换
* @author juqkai(juqkai@gmail.com)
*
*/
public class IdentifierParse implements Parse{
public Object fetchItem(CharQueue exp) {
StringBuilder sb = new StringBuilder();
if(Character.isJavaIdentifierStart(exp.peek())){
sb.append(exp.poll());
while(!exp.isEmpty() && Character.isJavaIdentifierPart(exp.peek())){
sb.append(exp.poll());
}
if(sb.toString().equals("null")){
return new IdentifierObj(null);
}
if(sb.toString().equals("true")){
return Boolean.TRUE;
}
if(sb.toString().equals("false")){
return Boolean.FALSE;
}
return new AbstractObj(sb.toString());
}
return nullobj;
}
}