/**
* Parse JSON text into java object from the input source.
*
* @param in
* @param containerFactory - Use this factory to createyour own JSON object and JSON array
* containers.
* @return Instance of the following: org.json.simple.JSONObject, org.json.simple.JSONArray,
* java.lang.String, java.lang.Number, java.lang.Boolean, null
* @throws IOException
* @throws ParseException
*/
public Object parse(Reader in, ContainerFactory containerFactory)
throws IOException, ParseException {
reset(in);
LinkedList statusStack = new LinkedList();
LinkedList valueStack = new LinkedList();
try {
do {
nextToken();
switch (status) {
case S_INIT:
switch (token.type) {
case Yytoken.TYPE_VALUE:
status = S_IN_FINISHED_VALUE;
statusStack.addFirst(new Integer(status));
valueStack.addFirst(token.value);
break;
case Yytoken.TYPE_LEFT_BRACE:
status = S_IN_OBJECT;
statusStack.addFirst(new Integer(status));
valueStack.addFirst(createObjectContainer(containerFactory));
break;
case Yytoken.TYPE_LEFT_SQUARE:
status = S_IN_ARRAY;
statusStack.addFirst(new Integer(status));
valueStack.addFirst(createArrayContainer(containerFactory));
break;
default:
status = S_IN_ERROR; // inner switch
}
break;
case S_IN_FINISHED_VALUE:
if (token.type == Yytoken.TYPE_EOF) return valueStack.removeFirst();
else
throw new ParseException(getPosition(), ParseException.ERROR_UNEXPECTED_TOKEN, token);
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.addFirst(key);
status = S_PASSED_PAIR_KEY;
statusStack.addFirst(new Integer(status));
} else {
status = S_IN_ERROR;
}
break;
case Yytoken.TYPE_RIGHT_BRACE:
if (valueStack.size() > 1) {
statusStack.removeFirst();
valueStack.removeFirst();
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.removeFirst();
String key = (String) valueStack.removeFirst();
Map parent = (Map) valueStack.getFirst();
parent.put(key, token.value);
status = peekStatus(statusStack);
break;
case Yytoken.TYPE_LEFT_SQUARE:
statusStack.removeFirst();
key = (String) valueStack.removeFirst();
parent = (Map) valueStack.getFirst();
List newArray = createArrayContainer(containerFactory);
parent.put(key, newArray);
status = S_IN_ARRAY;
statusStack.addFirst(new Integer(status));
valueStack.addFirst(newArray);
break;
case Yytoken.TYPE_LEFT_BRACE:
statusStack.removeFirst();
key = (String) valueStack.removeFirst();
parent = (Map) valueStack.getFirst();
Map newObject = createObjectContainer(containerFactory);
parent.put(key, newObject);
status = S_IN_OBJECT;
statusStack.addFirst(new Integer(status));
valueStack.addFirst(newObject);
break;
default:
status = S_IN_ERROR;
}
break;
case S_IN_ARRAY:
switch (token.type) {
case Yytoken.TYPE_COMMA:
break;
case Yytoken.TYPE_VALUE:
List val = (List) valueStack.getFirst();
val.add(token.value);
break;
case Yytoken.TYPE_RIGHT_SQUARE:
if (valueStack.size() > 1) {
statusStack.removeFirst();
valueStack.removeFirst();
status = peekStatus(statusStack);
} else {
status = S_IN_FINISHED_VALUE;
}
break;
case Yytoken.TYPE_LEFT_BRACE:
val = (List) valueStack.getFirst();
Map newObject = createObjectContainer(containerFactory);
val.add(newObject);
status = S_IN_OBJECT;
statusStack.addFirst(new Integer(status));
valueStack.addFirst(newObject);
break;
case Yytoken.TYPE_LEFT_SQUARE:
val = (List) valueStack.getFirst();
List newArray = createArrayContainer(containerFactory);
val.add(newArray);
status = S_IN_ARRAY;
statusStack.addFirst(new Integer(status));
valueStack.addFirst(newArray);
break;
default:
status = S_IN_ERROR; // inner switch
}
break;
case S_IN_ERROR:
throw new ParseException(
getPosition(), ParseException.ERROR_UNEXPECTED_TOKEN, token); // switch
}
if (status == S_IN_ERROR) {
throw new ParseException(getPosition(), ParseException.ERROR_UNEXPECTED_TOKEN, token);
}
} while (token.type != Yytoken.TYPE_EOF);
} catch (IOException ie) {
throw ie;
}
throw new ParseException(getPosition(), ParseException.ERROR_UNEXPECTED_TOKEN, token);
}
/**
* Stream processing of JSON text.
*
* @see ContentHandler
* @param in
* @param contentHandler
* @param isResume - Indicates if it continues previous parsing operation. If set to true, resume
* parsing the old stream, and parameter 'in' will be ignored. If this method is called for
* the first time in this instance, isResume will be ignored.
* @throws IOException
* @throws ParseException
*/
public void parse(Reader in, ContentHandler contentHandler, boolean isResume)
throws IOException, ParseException {
if (!isResume) {
reset(in);
handlerStatusStack = new LinkedList();
} else {
if (handlerStatusStack == null) {
isResume = false;
reset(in);
handlerStatusStack = new LinkedList();
}
}
LinkedList statusStack = handlerStatusStack;
try {
do {
switch (status) {
case S_INIT:
contentHandler.startJSON();
nextToken();
switch (token.type) {
case Yytoken.TYPE_VALUE:
status = S_IN_FINISHED_VALUE;
statusStack.addFirst(new Integer(status));
if (!contentHandler.primitive(token.value)) return;
break;
case Yytoken.TYPE_LEFT_BRACE:
status = S_IN_OBJECT;
statusStack.addFirst(new Integer(status));
if (!contentHandler.startObject()) return;
break;
case Yytoken.TYPE_LEFT_SQUARE:
status = S_IN_ARRAY;
statusStack.addFirst(new Integer(status));
if (!contentHandler.startArray()) return;
break;
default:
status = S_IN_ERROR; // inner switch
}
break;
case S_IN_FINISHED_VALUE:
nextToken();
if (token.type == Yytoken.TYPE_EOF) {
contentHandler.endJSON();
status = S_END;
return;
} else {
status = S_IN_ERROR;
throw new ParseException(getPosition(), ParseException.ERROR_UNEXPECTED_TOKEN, token);
}
case S_IN_OBJECT:
nextToken();
switch (token.type) {
case Yytoken.TYPE_COMMA:
break;
case Yytoken.TYPE_VALUE:
if (token.value instanceof String) {
String key = (String) token.value;
status = S_PASSED_PAIR_KEY;
statusStack.addFirst(new Integer(status));
if (!contentHandler.startObjectEntry(key)) return;
} else {
status = S_IN_ERROR;
}
break;
case Yytoken.TYPE_RIGHT_BRACE:
if (statusStack.size() > 1) {
statusStack.removeFirst();
status = peekStatus(statusStack);
} else {
status = S_IN_FINISHED_VALUE;
}
if (!contentHandler.endObject()) return;
break;
default:
status = S_IN_ERROR;
break; // inner switch
}
break;
case S_PASSED_PAIR_KEY:
nextToken();
switch (token.type) {
case Yytoken.TYPE_COLON:
break;
case Yytoken.TYPE_VALUE:
statusStack.removeFirst();
status = peekStatus(statusStack);
if (!contentHandler.primitive(token.value)) return;
if (!contentHandler.endObjectEntry()) return;
break;
case Yytoken.TYPE_LEFT_SQUARE:
statusStack.removeFirst();
statusStack.addFirst(new Integer(S_IN_PAIR_VALUE));
status = S_IN_ARRAY;
statusStack.addFirst(new Integer(status));
if (!contentHandler.startArray()) return;
break;
case Yytoken.TYPE_LEFT_BRACE:
statusStack.removeFirst();
statusStack.addFirst(new Integer(S_IN_PAIR_VALUE));
status = S_IN_OBJECT;
statusStack.addFirst(new Integer(status));
if (!contentHandler.startObject()) return;
break;
default:
status = S_IN_ERROR;
}
break;
case S_IN_PAIR_VALUE:
statusStack.removeFirst();
status = peekStatus(statusStack);
if (!contentHandler.endObjectEntry()) return;
break;
/*
* S_IN_PAIR_VALUE is just a marker to indicate the end of an object entry, it doesn't proccess any token,
* therefore delay consuming token until next round.
*/
case S_IN_ARRAY:
nextToken();
switch (token.type) {
case Yytoken.TYPE_COMMA:
break;
case Yytoken.TYPE_VALUE:
if (!contentHandler.primitive(token.value)) return;
break;
case Yytoken.TYPE_RIGHT_SQUARE:
if (statusStack.size() > 1) {
statusStack.removeFirst();
status = peekStatus(statusStack);
} else {
status = S_IN_FINISHED_VALUE;
}
if (!contentHandler.endArray()) return;
break;
case Yytoken.TYPE_LEFT_BRACE:
status = S_IN_OBJECT;
statusStack.addFirst(new Integer(status));
if (!contentHandler.startObject()) return;
break;
case Yytoken.TYPE_LEFT_SQUARE:
status = S_IN_ARRAY;
statusStack.addFirst(new Integer(status));
if (!contentHandler.startArray()) return;
break;
default:
status = S_IN_ERROR; // inner switch
}
break;
case S_END:
return;
case S_IN_ERROR:
throw new ParseException(
getPosition(), ParseException.ERROR_UNEXPECTED_TOKEN, token); // switch
}
if (status == S_IN_ERROR) {
throw new ParseException(getPosition(), ParseException.ERROR_UNEXPECTED_TOKEN, token);
}
} while (token.type != Yytoken.TYPE_EOF);
} catch (IOException ie) {
status = S_IN_ERROR;
throw ie;
} catch (ParseException pe) {
status = S_IN_ERROR;
throw pe;
} catch (RuntimeException re) {
status = S_IN_ERROR;
throw re;
} catch (Error e) {
status = S_IN_ERROR;
throw e;
}
status = S_IN_ERROR;
throw new ParseException(getPosition(), ParseException.ERROR_UNEXPECTED_TOKEN, token);
}
/**
* Reset the parser to the initial state with a new character reader.
*
* @param in - The new character reader.
* @throws IOException
* @throws ParseException
*/
public void reset(Reader in) {
lexer.yyreset(in);
reset();
}
@SuppressWarnings("unchecked")
public void testDecode() throws Exception {
System.out.println("=======decode=======");
String s = "[0,{\"1\":{\"2\":{\"3\":{\"4\":[5,{\"6\":7}]}}}}]";
Object obj = JSONValue.parse(s);
JSONArray array = (JSONArray) obj;
System.out.println("======the 2nd element of array======");
System.out.println(array.get(1));
System.out.println();
assertEquals("{\"1\":{\"2\":{\"3\":{\"4\":[5,{\"6\":7}]}}}}", array.get(1).toString());
JSONObject obj2 = (JSONObject) array.get(1);
System.out.println("======field \"1\"==========");
System.out.println(obj2.get("1"));
assertEquals("{\"2\":{\"3\":{\"4\":[5,{\"6\":7}]}}}", obj2.get("1").toString());
s = "{}";
obj = JSONValue.parse(s);
assertEquals("{}", obj.toString());
s = "[5,]";
obj = JSONValue.parse(s);
assertEquals("[5]", obj.toString());
s = "[5,,2]";
obj = JSONValue.parse(s);
assertEquals("[5,2]", obj.toString());
s = "[\"hello\\bworld\\\"abc\\tdef\\\\ghi\\rjkl\\n123\\u4e2d\"]";
obj = JSONValue.parse(s);
assertEquals("hello\bworld\"abc\tdef\\ghi\rjkl\n123中", ((List<Object>) obj).get(0).toString());
JSONParser parser = new JSONParser();
s = "{\"name\":";
try {
obj = parser.parse(s);
} catch (ParseException pe) {
assertEquals(ParseException.ERROR_UNEXPECTED_TOKEN, pe.getErrorType());
assertEquals(8, pe.getPosition());
}
s = "{\"name\":}";
try {
obj = parser.parse(s);
} catch (ParseException pe) {
assertEquals(ParseException.ERROR_UNEXPECTED_TOKEN, pe.getErrorType());
assertEquals(8, pe.getPosition());
}
s = "{\"name";
try {
obj = parser.parse(s);
} catch (ParseException pe) {
assertEquals(ParseException.ERROR_UNEXPECTED_TOKEN, pe.getErrorType());
assertEquals(6, pe.getPosition());
}
s = "[[null, 123.45, \"a\\\tb c\"}, true]";
try {
parser.parse(s);
} catch (ParseException pe) {
assertEquals(24, pe.getPosition());
System.out.println("Error at character position: " + pe.getPosition());
switch (pe.getErrorType()) {
case ParseException.ERROR_UNEXPECTED_TOKEN:
System.out.println("Unexpected token: " + pe.getUnexpectedObject());
break;
case ParseException.ERROR_UNEXPECTED_CHAR:
System.out.println("Unexpected character: " + pe.getUnexpectedObject());
break;
case ParseException.ERROR_UNEXPECTED_EXCEPTION:
((Exception) pe.getUnexpectedObject()).printStackTrace();
break;
}
}
s = "{\"first\": 123, \"second\": [4, 5, 6], \"third\": 789}";
ContainerFactory containerFactory =
new ContainerFactory() {
public List<Object> creatArrayContainer() {
return new LinkedList<Object>();
}
public Map<Object, Object> createObjectContainer() {
return new LinkedHashMap<Object, Object>();
}
};
try {
Map<Object, Object> json = (Map<Object, Object>) parser.parse(s, containerFactory);
Iterator<Map.Entry<Object, Object>> iter = json.entrySet().iterator();
System.out.println("==iterate result==");
while (iter.hasNext()) {
Map.Entry<Object, Object> entry = (Map.Entry<Object, Object>) iter.next();
System.out.println(entry.getKey() + "=>" + entry.getValue());
}
System.out.println("==toJSONString()==");
System.out.println(JSONValue.toJSONString(json));
assertEquals(
"{\"first\":123,\"second\":[4,5,6],\"third\":789}", JSONValue.toJSONString(json));
} catch (ParseException pe) {
pe.printStackTrace();
}
s = "{\"first\": 123, \"second\": [{\"s1\":{\"s11\":\"v11\"}}, 4, 5, 6], \"third\": 789}";
ContentHandler myHandler =
new ContentHandler() {
public boolean endArray() throws ParseException {
System.out.println("endArray()");
return true;
}
public void endJSON() throws ParseException {
System.out.println("endJSON()");
}
public boolean endObject() throws ParseException {
System.out.println("endObject()");
return true;
}
public boolean endObjectEntry() throws ParseException {
System.out.println("endObjectEntry()");
return true;
}
public boolean primitive(Object value) throws ParseException {
System.out.println("primitive(): " + value);
return true;
}
public boolean startArray() throws ParseException {
System.out.println("startArray()");
return true;
}
public void startJSON() throws ParseException {
System.out.println("startJSON()");
}
public boolean startObject() throws ParseException {
System.out.println("startObject()");
return true;
}
public boolean startObjectEntry(String key) throws ParseException {
System.out.println("startObjectEntry(), key:" + key);
return true;
}
};
try {
parser.parse(s, myHandler);
} catch (ParseException pe) {
pe.printStackTrace();
}
class KeyFinder implements ContentHandler {
private Object value;
private boolean found = false;
private boolean end = false;
private String key;
private String matchKey;
public void setMatchKey(String matchKey) {
this.matchKey = matchKey;
}
public Object getValue() {
return value;
}
public boolean isEnd() {
return end;
}
public void setFound(boolean found) {
this.found = found;
}
public boolean isFound() {
return found;
}
public void startJSON() throws ParseException, IOException {
found = false;
end = false;
}
public void endJSON() throws ParseException, IOException {
end = true;
}
public boolean primitive(Object value) throws ParseException, IOException {
if (key != null) {
if (key.equals(matchKey)) {
found = true;
this.value = value;
key = null;
return false;
}
}
return true;
}
public boolean startArray() throws ParseException, IOException {
return true;
}
public boolean startObject() throws ParseException, IOException {
return true;
}
public boolean startObjectEntry(String key) throws ParseException, IOException {
this.key = key;
return true;
}
public boolean endArray() throws ParseException, IOException {
return false;
}
public boolean endObject() throws ParseException, IOException {
return true;
}
public boolean endObjectEntry() throws ParseException, IOException {
return true;
}
};
s =
"{\"first\": 123, \"second\": [{\"k1\":{\"id\":\"id1\"}}, 4, 5, 6, {\"id\": 123}], \"third\": 789, \"id\": null}";
parser.reset();
KeyFinder keyFinder = new KeyFinder();
keyFinder.setMatchKey("id");
int i = 0;
try {
while (!keyFinder.isEnd()) {
parser.parse(s, keyFinder, true);
if (keyFinder.isFound()) {
i++;
keyFinder.setFound(false);
System.out.println("found id:");
System.out.println(keyFinder.getValue());
if (i == 1) assertEquals("id1", keyFinder.getValue());
if (i == 2) {
assertTrue(keyFinder.getValue() instanceof Number);
assertEquals("123", String.valueOf(keyFinder.getValue()));
}
if (i == 3) assertTrue(null == keyFinder.getValue());
}
}
} catch (ParseException pe) {
pe.printStackTrace();
}
}