package org.nutz.el.parse;
import org.nutz.el.ElException;
import org.nutz.el.Parse;
/**
* 数值转换器
* @author juqkai(juqkai@gmail.com)
*
*/
public class ValParse implements Parse {
public Object fetchItem(CharQueue exp){
StringBuilder sb = new StringBuilder();
switch(exp.peek()){
case '.':
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
boolean hasPoint = exp.peek() == '.';
sb.append(exp.poll());
while(!exp.isEmpty()){
switch(exp.peek()){
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
sb.append(exp.poll());
break;
case '.':
if(hasPoint){
throw new ElException("表达式错误,请查看是否有多个'.'!");
}
hasPoint = true;
sb.append(exp.poll());
break;
case 'l':
case 'L':
sb.append(exp.poll());
return Long.parseLong(sb.toString());
case 'f':
case 'F':
sb.append(exp.poll());
return Float.parseFloat(sb.toString());
case 'd':
case 'D':
sb.append(exp.poll());
return Double.parseDouble(sb.toString());
default:
if(hasPoint){
return Double.parseDouble(sb.toString());
}
return Integer.parseInt(sb.toString());
}
}
if(hasPoint){
return Double.parseDouble(sb.toString());
}
return Integer.parseInt(sb.toString());
}
return nullobj;
}
}