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/*
* $Id: JSONParser.java,v 1.1 2006/04/15 14:10:48 platform Exp $
* Created on 2006-4-15
*/
package org.json.simple.parser;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
/**
* Parser for JSON text. Please note that JSONParser is NOT thread-safe.
*
* @author FangYidong
*/
public class JSONParser {
public static final int S_INIT = 0;
public static final int S_IN_FINISHED_VALUE = 1;//string,number,boolean,null,object,array
public static final int S_IN_OBJECT = 2;
public static final int S_IN_ARRAY = 3;
public static final int S_PASSED_PAIR_KEY = 4;
public static final int S_IN_PAIR_VALUE = 5;
public static final int S_END = 6;
public static final int S_IN_ERROR = -1;
private LinkedList handlerStatusStack;
private Yylex lexer = new Yylex((Reader) null);
private Yytoken token = null;
private int status = S_INIT;
private int peekStatus(LinkedList statusStack) {
if (statusStack.size() == 0) {
return -1;
}
Integer status = (Integer) statusStack.getFirst();
return status.intValue();
}
/**
* Reset the parser to the initial state without resetting the underlying reader.
*/
public void reset() {
token = null;
status = S_INIT;
handlerStatusStack = null;
}
/**
* 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();
}
/**
* @return The position of the beginning of the current token.
*/
public int getPosition() {
return lexer.getPosition();
}
public Object parse(String s) throws ParseException {
return parse(s, (ContainerFactory) null);
}
public Object parse(String s, ContainerFactory containerFactory) throws ParseException {
StringReader in = new StringReader(s);
try {
return parse(in, containerFactory);
} catch (IOException ie) {
/*
* Actually it will never happen.
*/
throw new ParseException(-1, ParseException.ERROR_UNEXPECTED_EXCEPTION, ie);
}
}
public Object parse(Reader in) throws IOException, ParseException {
return parse(in, (ContainerFactory) null);
}
/**
* 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);
}
private void nextToken() throws ParseException, IOException {
token = lexer.yylex();
if (token == null) {
token = new Yytoken(Yytoken.TYPE_EOF, null);
}
}
private Map createObjectContainer(ContainerFactory containerFactory) {
if (containerFactory == null) {
return new JSONObject();
}
Map m = containerFactory.createObjectContainer();
if (m == null) {
return new JSONObject();
}
return m;
}
private List createArrayContainer(ContainerFactory containerFactory) {
if (containerFactory == null) {
return new JSONArray();
}
List l = containerFactory.creatArrayContainer();
if (l == null) {
return new JSONArray();
}
return l;
}
public void parse(String s, ContentHandler contentHandler) throws ParseException {
parse(s, contentHandler, false);
}
public void parse(String s, ContentHandler contentHandler, boolean isResume) throws ParseException {
StringReader in = new StringReader(s);
try {
parse(in, contentHandler, isResume);
} catch (IOException ie) {
/*
* Actually it will never happen.
*/
throw new ParseException(-1, ParseException.ERROR_UNEXPECTED_EXCEPTION, ie);
}
}
public void parse(Reader in, ContentHandler contentHandler) throws IOException, ParseException {
parse(in, contentHandler, false);
}
/**
* Stream processing of JSON text.
*
* @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
* @see ContentHandler
*/
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:
/*
* 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.
*/
statusStack.removeFirst();
status = peekStatus(statusStack);
if (!contentHandler.endObjectEntry())
return;
break;
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);
}
}
