Stack statusStack=new Stack();
Stack valueStack=new Stack();
Yylex lexer=new Yylex(in);
Yytoken token=null;
int status=S_INIT;
try{
do{
token=lexer.yylex();
if(token==null)
token=new Yytoken(Yytoken.TYPE_EOF,null);
switch(status){
case S_INIT:
switch(token.type){
case Yytoken.TYPE_VALUE:
status=S_IN_FINISHED_VALUE;
statusStack.push(new Integer(status));
valueStack.push(token.value);
break;
case Yytoken.TYPE_LEFT_BRACE:
status=S_IN_OBJECT;
statusStack.push(new Integer(status));
valueStack.push(new JSONObject());
break;
case Yytoken.TYPE_LEFT_SQUARE:
status=S_IN_ARRAY;
statusStack.push(new Integer(status));
valueStack.push(new JSONArray());
break;
default:
status=S_IN_ERROR;
}//inner switch
break;
case S_IN_FINISHED_VALUE:
if(token.type==Yytoken.TYPE_EOF)
return valueStack.pop();
else
return null;
case S_IN_OBJECT:
switch(token.type){
case Yytoken.TYPE_COMMA:
break;
case Yytoken.TYPE_VALUE:
if(token.value instanceof String){
String key=(String)token.value;
valueStack.push(key);
status=S_PASSED_PAIR_KEY;
statusStack.push(new Integer(status));
}
else{
status=S_IN_ERROR;
}
break;
case Yytoken.TYPE_RIGHT_BRACE:
if(valueStack.size()>1){
statusStack.pop();
valueStack.pop();
status=peekStatus(statusStack);
}
else{
status=S_IN_FINISHED_VALUE;
}
break;
default:
status=S_IN_ERROR;
break;
}//inner switch
break;
case S_PASSED_PAIR_KEY:
switch(token.type){
case Yytoken.TYPE_COLON:
break;
case Yytoken.TYPE_VALUE:
statusStack.pop();
String key=(String)valueStack.pop();
JSONObject parent=(JSONObject)valueStack.peek();
parent.put(key,token.value);
status=peekStatus(statusStack);
break;
case Yytoken.TYPE_LEFT_SQUARE:
statusStack.pop();
key=(String)valueStack.pop();
parent=(JSONObject)valueStack.peek();
JSONArray newArray=new JSONArray();
parent.put(key,newArray);
status=S_IN_ARRAY;
statusStack.push(new Integer(status));
valueStack.push(newArray);
break;
case Yytoken.TYPE_LEFT_BRACE:
statusStack.pop();
key=(String)valueStack.pop();
parent=(JSONObject)valueStack.peek();
JSONObject newObject=new JSONObject();
parent.put(key,newObject);
status=S_IN_OBJECT;
statusStack.push(new Integer(status));
valueStack.push(newObject);
break;
default:
status=S_IN_ERROR;
}
break;
case S_IN_ARRAY:
switch(token.type){
case Yytoken.TYPE_COMMA:
break;
case Yytoken.TYPE_VALUE:
JSONArray val=(JSONArray)valueStack.peek();
val.add(token.value);
break;
case Yytoken.TYPE_RIGHT_SQUARE:
if(valueStack.size()>1){
statusStack.pop();
valueStack.pop();
status=peekStatus(statusStack);
}
else{
status=S_IN_FINISHED_VALUE;
}
break;
case Yytoken.TYPE_LEFT_BRACE:
val=(JSONArray)valueStack.peek();
JSONObject newObject=new JSONObject();
val.add(newObject);
status=S_IN_OBJECT;
statusStack.push(new Integer(status));
valueStack.push(newObject);
break;
case Yytoken.TYPE_LEFT_SQUARE:
val=(JSONArray)valueStack.peek();
JSONArray newArray=new JSONArray();
val.add(newArray);
status=S_IN_ARRAY;
statusStack.push(new Integer(status));
valueStack.push(newArray);
break;
default:
status=S_IN_ERROR;
}//inner switch
break;
case S_IN_ERROR:
return null;
}//switch
if(status==S_IN_ERROR)
return null;
}while(token.type!=Yytoken.TYPE_EOF);
}
catch(Exception e){
throw e;
}
return null;
