/src/main/java/com/alibaba/fastjson/parser/DefaultJSONParser.java

/*
 * Copyright 1999-2101 Alibaba Group.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alibaba.fastjson.parser;

import static com.alibaba.fastjson.parser.JSONScanner.EOI;
import static com.alibaba.fastjson.parser.JSONToken.EOF;
import static com.alibaba.fastjson.parser.JSONToken.ERROR;
import static com.alibaba.fastjson.parser.JSONToken.FALSE;
import static com.alibaba.fastjson.parser.JSONToken.LBRACE;
import static com.alibaba.fastjson.parser.JSONToken.LBRACKET;
import static com.alibaba.fastjson.parser.JSONToken.LITERAL_FLOAT;
import static com.alibaba.fastjson.parser.JSONToken.LITERAL_INT;
import static com.alibaba.fastjson.parser.JSONToken.LITERAL_STRING;
import static com.alibaba.fastjson.parser.JSONToken.NEW;
import static com.alibaba.fastjson.parser.JSONToken.NULL;
import static com.alibaba.fastjson.parser.JSONToken.RBRACKET;
import static com.alibaba.fastjson.parser.JSONToken.SET;
import static com.alibaba.fastjson.parser.JSONToken.TREE_SET;
import static com.alibaba.fastjson.parser.JSONToken.TRUE;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.lang.reflect.WildcardType;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONException;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.parser.deserializer.DefaultObjectDeserializer;
import com.alibaba.fastjson.parser.deserializer.FieldDeserializer;
import com.alibaba.fastjson.parser.deserializer.IntegerDeserializer;
import com.alibaba.fastjson.parser.deserializer.ListResolveFieldDeserializer;
import com.alibaba.fastjson.parser.deserializer.MapResolveFieldDeserializer;
import com.alibaba.fastjson.parser.deserializer.ObjectDeserializer;
import com.alibaba.fastjson.parser.deserializer.StringDeserializer;
import com.alibaba.fastjson.util.TypeUtils;

/**
 * @author wenshao<szujobs@hotmail.com>
 */
public class DefaultJSONParser extends AbstractJSONParser {

    protected final Object             input;
    protected final SymbolTable        symbolTable;
    protected ParserConfig             config;

    private DefaultObjectDeserializer  derializer        = new DefaultObjectDeserializer();

    private final static Set<Class<?>> primitiveClasses  = new HashSet<Class<?>>();

    private String                     dateFormatPattern = JSON.DEFFAULT_DATE_FORMAT;
    private DateFormat                 dateFormat;

    protected final JSONLexer          lexer;

    protected ParseContext             context;

    private ParseContext[]             contextArray      = new ParseContext[8];
    private int                        contextArrayIndex = 0;

    private final List<ResolveTask>    resolveTaskList   = new ArrayList<ResolveTask>();

    public final static int            NONE              = 0;
    public final static int            NeedToResolve     = 1;
    public final static int            TypeNameRedirect  = 2;

    private int                        resolveStatus     = NONE;

    static {
        primitiveClasses.add(boolean.class);
        primitiveClasses.add(byte.class);
        primitiveClasses.add(short.class);
        primitiveClasses.add(int.class);
        primitiveClasses.add(long.class);
        primitiveClasses.add(float.class);
        primitiveClasses.add(double.class);

        primitiveClasses.add(Boolean.class);
        primitiveClasses.add(Byte.class);
        primitiveClasses.add(Short.class);
        primitiveClasses.add(Integer.class);
        primitiveClasses.add(Long.class);
        primitiveClasses.add(Float.class);
        primitiveClasses.add(Double.class);

        primitiveClasses.add(BigInteger.class);
        primitiveClasses.add(BigDecimal.class);
        primitiveClasses.add(String.class);
    }

    public String getDateFomartPattern() {
        return dateFormatPattern;
    }

    public DateFormat getDateFormat() {
        if (dateFormat == null) {
            dateFormat = new SimpleDateFormat(dateFormatPattern);
        }
        return dateFormat;
    }

    public void setDateFormat(String dateFormat) {
        this.dateFormatPattern = dateFormat;
        this.dateFormat = null;
    }

    public void setDateFomrat(DateFormat dateFormat) {
        this.dateFormat = dateFormat;
    }

    public DefaultJSONParser(String input){
        this(input, ParserConfig.getGlobalInstance(), JSON.DEFAULT_PARSER_FEATURE);
    }

    public DefaultJSONParser(final String input, final ParserConfig config){
        this(input, new JSONScanner(input, JSON.DEFAULT_PARSER_FEATURE), config);
    }

    public DefaultJSONParser(final String input, final ParserConfig config, int features){
        this(input, new JSONScanner(input, features), config);
    }

    public DefaultJSONParser(final char[] input, int length, final ParserConfig config, int features){
        this(input, new JSONScanner(input, length, features), config);
    }

    public DefaultJSONParser(final Object input, final JSONLexer lexer, final ParserConfig config){
        this.lexer = lexer;
        this.input = input;
        this.config = config;
        this.symbolTable = config.getSymbolTable();

        lexer.nextToken(JSONToken.LBRACE); // prime the pump
    }

    public SymbolTable getSymbolTable() {
        return symbolTable;
    }

    public String getInput() {
        if (input instanceof char[]) {
            return new String((char[]) input);
        }
        return input.toString();
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    public final Object parseObject(final Map object, Object fieldName) {
        JSONScanner lexer = (JSONScanner) this.lexer;

        if (lexer.token() != JSONToken.LBRACE && lexer.token() != JSONToken.COMMA) {
            throw new JSONException("syntax error, expect {, actual " + lexer.tokenName());
        }

        ParseContext context = this.getContext();
        try {
            boolean setContextFlag = false;
            for (;;) {
                lexer.skipWhitespace();
                char ch = lexer.getCurrent();
                if (isEnabled(Feature.AllowArbitraryCommas)) {
                    while (ch == ',') {
                        lexer.incrementBufferPosition();
                        lexer.skipWhitespace();
                        ch = lexer.getCurrent();
                    }
                }

                boolean isObjectKey = false;
                Object key;
                if (ch == '"') {
                    key = lexer.scanSymbol(symbolTable, '"');
                    lexer.skipWhitespace();
                    ch = lexer.getCurrent();
                    if (ch != ':') {
                        throw new JSONException("expect ':' at " + lexer.pos() + ", name " + key);
                    }
                } else if (ch == '}') {
                    lexer.incrementBufferPosition();
                    lexer.resetStringPosition();
                    lexer.nextToken();
                    return object;
                } else if (ch == '\'') {
                    if (!isEnabled(Feature.AllowSingleQuotes)) {
                        throw new JSONException("syntax error");
                    }

                    key = lexer.scanSymbol(symbolTable, '\'');
                    lexer.skipWhitespace();
                    ch = lexer.getCurrent();
                    if (ch != ':') {
                        throw new JSONException("expect ':' at " + lexer.pos());
                    }
                } else if (ch == EOI) {
                    throw new JSONException("syntax error");
                } else if (ch == ',') {
                    throw new JSONException("syntax error");
                } else if ((ch >= '0' && ch <= '9') || ch == '-') {
                    lexer.resetStringPosition();
                    lexer.scanNumber();
                    if (lexer.token() == JSONToken.LITERAL_INT) {
                        key = lexer.integerValue();
                    } else {
                        key = lexer.decimalValue(true);
                    }
                    ch = lexer.getCurrent();
                    if (ch != ':') {
                        throw new JSONException("expect ':' at " + lexer.pos() + ", name " + key);
                    }
                } else if (ch == '{' || ch == '[') {
                    lexer.nextToken();
                    key = parse();
                    isObjectKey = true;
                } else {
                    if (!isEnabled(Feature.AllowUnQuotedFieldNames)) {
                        throw new JSONException("syntax error");
                    }

                    key = lexer.scanSymbolUnQuoted(symbolTable);
                    lexer.skipWhitespace();
                    ch = lexer.getCurrent();
                    if (ch != ':') {
                        throw new JSONException("expect ':' at " + lexer.pos() + ", actual " + ch);
                    }
                }

                if (!isObjectKey) {
                    lexer.incrementBufferPosition();
                    lexer.skipWhitespace();
                }

                ch = lexer.getCurrent();

                lexer.resetStringPosition();

                if (key == "@type") {
                    String typeName = lexer.scanSymbol(symbolTable, '"');
                    Class<?> clazz = TypeUtils.loadClass(typeName);

                    if (clazz == null) {
                        object.put("@type", typeName);
                        continue;
                    }

                    lexer.nextToken(JSONToken.COMMA);
                    if (lexer.token() == JSONToken.RBRACE) {
                        lexer.nextToken(JSONToken.COMMA);
                        try {
                            return clazz.newInstance();
                        } catch (Exception e) {
                            throw new JSONException("create instance error", e);
                        }
                    }

                    this.setResolveStatus(TypeNameRedirect);

                    if (this.context != null && !(fieldName instanceof Integer)) {
                        this.popContext();
                    }

                    ObjectDeserializer deserializer = config.getDeserializer(clazz);
                    return deserializer.deserialze(this, clazz, fieldName);
                }
                
                if (key == "$ref") {
                    lexer.nextToken(JSONToken.LITERAL_STRING);
                    if (lexer.token() == JSONToken.LITERAL_STRING) {
                        String ref = lexer.stringVal();
                        lexer.nextToken(JSONToken.RBRACE);

                        Object refValue = null;
                        if ("@".equals(ref)) {
                            if (this.getContext() != null) {
                                refValue = this.getContext().getObject();
                            }
                        } else if ("..".equals(ref)) {
                            ParseContext parentContext = context.getParentContext();
                            if (parentContext.getObject() != null) {
                                refValue = this.getContext().getObject();
                            } else {
                                addResolveTask(new ResolveTask(parentContext, ref));
                                setResolveStatus(DefaultJSONParser.NeedToResolve);
                            }
                        } else if ("$".equals(ref)) {
                            ParseContext rootContext = context;
                            while (rootContext.getParentContext() != null) {
                                rootContext = rootContext.getParentContext();
                            }

                            if (rootContext.getObject() != null) {
                                refValue = rootContext.getObject();
                            } else {
                                addResolveTask(new ResolveTask(rootContext, ref));
                                setResolveStatus(DefaultJSONParser.NeedToResolve);
                            }
                        } else {
                            addResolveTask(new ResolveTask(context, ref));
                            setResolveStatus(DefaultJSONParser.NeedToResolve);
                        }

                        if (lexer.token() != JSONToken.RBRACE) {
                            throw new JSONException("syntax error");
                        }
                        lexer.nextToken(JSONToken.COMMA);

                        return refValue;
                    } else {
                        throw new JSONException("illegal ref, " + JSONToken.name(lexer.token()));
                    }
                }
                
                if (!setContextFlag) {
                    setContext(object, fieldName);
                    setContextFlag = true;
                }

                Object value;
                if (ch == '"') {
                    lexer.scanString();
                    String strValue = lexer.stringVal();
                    value = strValue;

                    if (lexer.isEnabled(Feature.AllowISO8601DateFormat)) {
                        JSONScanner iso8601Lexer = new JSONScanner(strValue);
                        if (iso8601Lexer.scanISO8601DateIfMatch()) {
                            value = iso8601Lexer.getCalendar().getTime();
                        }
                    }

                    if (object.getClass() == JSONObject.class) {
                        object.put(key.toString(), value);
                    } else {
                        object.put(key, value);
                    }
                } else if (ch >= '0' && ch <= '9' || ch == '-') {
                    lexer.scanNumber();
                    if (lexer.token() == JSONToken.LITERAL_INT) {
                        value = lexer.integerValue();
                    } else {
                        value = lexer.decimalValue();
                    }

                    object.put(key, value);
                } else if (ch == '[') { // 减少潜套，兼容android
                    lexer.nextToken();
                    JSONArray list = new JSONArray();
                    this.parseArray(list, key);
                    value = list;
                    object.put(key, value);

                    if (lexer.token() == JSONToken.RBRACE) {
                        lexer.nextToken();
                        return object;
                    } else if (lexer.token() == JSONToken.COMMA) {
                        continue;
                    } else {
                        throw new JSONException("syntax error");
                    }
                } else if (ch == '{') { // 减少潜套，兼容android
                    lexer.nextToken();
                    Object obj = this.parseObject(new JSONObject(), key);
                    checkMapResolve(object, key.toString());

                    if (object.getClass() == JSONObject.class) {
                        object.put(key.toString(), obj);
                    } else {
                        object.put(key, obj);
                    }

                    setContext(context, obj, key);

                    if (lexer.token() == JSONToken.RBRACE) {
                        lexer.nextToken();

                        setContext(context);
                        return object;
                    } else if (lexer.token() == JSONToken.COMMA) {
                        continue;
                    } else {
                        throw new JSONException("syntax error, " + lexer.tokenName());
                    }
                } else {
                    lexer.nextToken();
                    value = parse();
                    object.put(key, value);

                    if (lexer.token() == JSONToken.RBRACE) {
                        lexer.nextToken();
                        return object;
                    } else if (lexer.token() == JSONToken.COMMA) {
                        continue;
                    } else {
                        throw new JSONException("syntax error, position at " + lexer.pos() + ", name " + key);
                    }
                }

                lexer.skipWhitespace();
                ch = lexer.getCurrent();
                if (ch == ',') {
                    lexer.incrementBufferPosition();
                    continue;
                } else if (ch == '}') {
                    lexer.incrementBufferPosition();
                    lexer.resetStringPosition();
                    lexer.nextToken();

                    this.setContext(object, fieldName);

                    return object;
                } else {
                    throw new JSONException("syntax error, position at " + lexer.pos() + ", name " + key);
                }

            }
        } finally {
            this.setContext(context);
        }

    }

    public ParserConfig getConfig() {
        return config;
    }

    public void setConfig(ParserConfig config) {
        this.config = config;
    }

    // compatible
    @SuppressWarnings("unchecked")
    public <T> T parseObject(Class<T> clazz) {
        return (T) parseObject((Type) clazz);
    }

    @SuppressWarnings("unchecked")
    public <T> T parseObject(Type type) {
        if (lexer.token() == JSONToken.NULL) {
            lexer.nextToken();
            return null;
        }

        ObjectDeserializer derializer = config.getDeserializer(type);

        try {
            return (T) derializer.deserialze(this, type, null);
        } catch (JSONException e) {
            throw e;
        } catch (Throwable e) {
            throw new JSONException(e.getMessage(), e);
        }
    }

    public <T> List<T> parseArray(Class<T> clazz) {
        List<T> array = new ArrayList<T>();
        parseArray(clazz, array);
        return array;
    }

    public void parseArray(Class<?> clazz, @SuppressWarnings("rawtypes") Collection array) {
        parseArray((Type) clazz, array);
    }

    @SuppressWarnings("rawtypes")
    public void parseArray(Type type, Collection array) {
        parseArray(type, array, null);
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    public void parseArray(Type type, Collection array, Object fieldName) {
        if (lexer.token() == JSONToken.SET || lexer.token() == JSONToken.TREE_SET) {
            lexer.nextToken();
        }

        if (lexer.token() != JSONToken.LBRACKET) {
            throw new JSONException("exepct '[', but " + JSONToken.name(lexer.token()));
        }

        ObjectDeserializer deserializer = null;
        if (int.class == type) {
            deserializer = IntegerDeserializer.instance;
            lexer.nextToken(JSONToken.LITERAL_INT);
        } else if (String.class == type) {
            deserializer = StringDeserializer.instance;
            lexer.nextToken(JSONToken.LITERAL_STRING);
        } else {
            deserializer = config.getDeserializer(type);
            lexer.nextToken(deserializer.getFastMatchToken());
        }

        ParseContext context = this.getContext();
        this.setContext(array, fieldName);
        try {
            for (int i = 0;; ++i) {
                if (isEnabled(Feature.AllowArbitraryCommas)) {
                    while (lexer.token() == JSONToken.COMMA) {
                        lexer.nextToken();
                        continue;
                    }
                }

                if (lexer.token() == JSONToken.RBRACKET) {
                    break;
                }

                if (int.class == type) {
                    Object val = IntegerDeserializer.deserialze(this);
                    array.add(val);
                } else if (String.class == type) {
                    String value;
                    if (lexer.token() == JSONToken.LITERAL_STRING) {
                        value = lexer.stringVal();
                        lexer.nextToken(JSONToken.COMMA);
                    } else {
                        Object obj = this.parse();
                        if (obj == null) {
                            value = null;
                        } else {
                            value = obj.toString();
                        }
                    }

                    array.add(value);
                } else {
                    Object val;
                    if (lexer.token() == JSONToken.NULL) {
                        lexer.nextToken();
                        val = null;
                    } else {
                        val = deserializer.deserialze(this, type, i);
                    }
                    array.add(val);
                    checkListResolve(array);
                }

                if (lexer.token() == JSONToken.COMMA) {
                    lexer.nextToken(deserializer.getFastMatchToken());
                    continue;
                }
            }
        } finally {
            this.setContext(context);
        }

        lexer.nextToken(JSONToken.COMMA);
    }

    public Object[] parseArray(Type[] types) {
        if (lexer.token() == JSONToken.NULL) {
            lexer.nextToken(JSONToken.COMMA);
            return null;
        }

        if (lexer.token() != JSONToken.LBRACKET) {
            throw new JSONException("syntax error : " + lexer.tokenName());
        }

        Object[] list = new Object[types.length];
        if (types.length == 0) {
            lexer.nextToken(JSONToken.RBRACKET);

            if (lexer.token() != JSONToken.RBRACKET) {
                throw new JSONException("syntax error");
            }

            lexer.nextToken(JSONToken.COMMA);
            return new Object[0];
        }

        lexer.nextToken(JSONToken.LITERAL_INT);

        for (int i = 0; i < types.length; ++i) {
            Object value;

            if (lexer.token() == JSONToken.NULL) {
                value = null;
                lexer.nextToken(JSONToken.COMMA);
            } else {
                Type type = types[i];
                if (type == int.class || type == Integer.class) {
                    if (lexer.token() == JSONToken.LITERAL_INT) {
                        value = Integer.valueOf(lexer.intValue());
                        lexer.nextToken(JSONToken.COMMA);
                    } else {
                        value = this.parse();
                        value = TypeUtils.cast(value, type, config);
                    }
                } else if (type == String.class) {
                    if (lexer.token() == JSONToken.LITERAL_STRING) {
                        value = lexer.stringVal();
                        lexer.nextToken(JSONToken.COMMA);
                    } else {
                        value = this.parse();
                        value = TypeUtils.cast(value, type, config);
                    }
                } else {
                    boolean isArray = false;
                    Class<?> componentType = null;
                    if (i == types.length - 1) {
                        if (type instanceof Class) {
                            Class<?> clazz = (Class<?>) type;
                            isArray = clazz.isArray();
                            componentType = clazz.getComponentType();
                        }
                    }

                    // support varArgs
                    if (isArray && lexer.token() != JSONToken.LBRACKET) {
                        List<Object> varList = new ArrayList<Object>();

                        ObjectDeserializer derializer = config.getDeserializer(componentType);
                        int fastMatch = derializer.getFastMatchToken();

                        if (lexer.token() != JSONToken.RBRACKET) {
                            for (;;) {
                                Object item = derializer.deserialze(this, type, null);
                                varList.add(item);

                                if (lexer.token() == JSONToken.COMMA) {
                                    lexer.nextToken(fastMatch);
                                } else if (lexer.token() == JSONToken.RBRACKET) {
                                    break;
                                } else {
                                    throw new JSONException("syntax error :" + JSONToken.name(lexer.token()));
                                }
                            }
                        }

                        value = TypeUtils.cast(varList, type, config);
                    } else {
                        ObjectDeserializer derializer = config.getDeserializer(type);
                        value = derializer.deserialze(this, type, null);
                    }
                }
            }
            list[i] = value;

            if (lexer.token() == JSONToken.RBRACKET) {
                break;
            }

            if (lexer.token() != JSONToken.COMMA) {
                throw new JSONException("syntax error :" + JSONToken.name(lexer.token()));
            }

            if (i == types.length - 1) {
                lexer.nextToken(JSONToken.RBRACKET);
            } else {
                lexer.nextToken(JSONToken.LITERAL_INT);
            }
        }

        if (lexer.token() != JSONToken.RBRACKET) {
            throw new JSONException("syntax error");
        }

        lexer.nextToken(JSONToken.COMMA);

        return list;
    }

    public void parseObject(Object object) {
        derializer.parseObject(this, object);
    }

    public Object parseArrayWithType(Type collectionType) {
        if (lexer.token() == JSONToken.NULL) {
            lexer.nextToken();
            return null;
        }

        Type[] actualTypes = ((ParameterizedType) collectionType).getActualTypeArguments();

        if (actualTypes.length != 1) {
            throw new JSONException("not support type " + collectionType);
        }

        Type actualTypeArgument = actualTypes[0];

        if (actualTypeArgument instanceof Class) {
            List<Object> array = new ArrayList<Object>();
            this.parseArray((Class<?>) actualTypeArgument, array);
            return array;
        }

        if (actualTypeArgument instanceof WildcardType) {
            WildcardType wildcardType = (WildcardType) actualTypeArgument;

            // assert wildcardType.getUpperBounds().length == 1;
            Type upperBoundType = wildcardType.getUpperBounds()[0];

            // assert upperBoundType instanceof Class;
            if (Object.class.equals(upperBoundType)) {
                if (wildcardType.getLowerBounds().length == 0) {
                    // Collection<?>
                    return parse();
                } else {
                    throw new JSONException("not support type : " + collectionType);
                }
            }

            List<Object> array = new ArrayList<Object>();
            this.parseArray((Class<?>) upperBoundType, array);
            return array;

            // throw new JSONException("not support type : " +
            // collectionType);return parse();
        }

        if (actualTypeArgument instanceof TypeVariable) {
            TypeVariable<?> typeVariable = (TypeVariable<?>) actualTypeArgument;
            Type[] bounds = typeVariable.getBounds();

            if (bounds.length != 1) {
                throw new JSONException("not support : " + typeVariable);
            }

            Type boundType = bounds[0];
            if (boundType instanceof Class) {
                List<Object> array = new ArrayList<Object>();
                this.parseArray((Class<?>) boundType, array);
                return array;
            }
        }

        if (actualTypeArgument instanceof ParameterizedType) {
            ParameterizedType parameterizedType = (ParameterizedType) actualTypeArgument;

            List<Object> array = new ArrayList<Object>();
            this.parseArray(parameterizedType, array);
            return array;
        }

        throw new JSONException("TODO : " + collectionType);
    }

    public void acceptType(String typeName) {
        JSONScanner lexer = (JSONScanner) this.lexer;

        lexer.nextTokenWithColon();

        if (lexer.token() != JSONToken.LITERAL_STRING) {
            throw new JSONException("type not match error");
        }

        if (typeName.equals(lexer.stringVal())) {
            lexer.nextToken();
            if (lexer.token() == JSONToken.COMMA) {
                lexer.nextToken();
            }
        } else {
            throw new JSONException("type not match error");
        }
    }

    public int getResolveStatus() {
        return resolveStatus;
    }

    public void setResolveStatus(int resolveStatus) {
        this.resolveStatus = resolveStatus;
    }

    public Object getObject(String path) {
        for (int i = 0; i < contextArrayIndex; ++i) {
            if (path.equals(contextArray[i].getPath())) {
                return contextArray[i].getObject();
            }
        }

        return null;
    }

    @SuppressWarnings("rawtypes")
    public void checkListResolve(Collection array) {
        if (resolveStatus == NeedToResolve) {
            final int index = array.size() - 1;
            final List list = (List) array;
            ResolveTask task = getLastResolveTask();
            task.setFieldDeserializer(new ListResolveFieldDeserializer(this, list, index));
            task.setOwnerContext(context);
            setResolveStatus(DefaultJSONParser.NONE);
        }
    }

    @SuppressWarnings("rawtypes")
    public void checkMapResolve(Map object, String fieldName) {
        if (resolveStatus == NeedToResolve) {
            MapResolveFieldDeserializer fieldResolver = new MapResolveFieldDeserializer(object, fieldName);
            ResolveTask task = getLastResolveTask();
            task.setFieldDeserializer(fieldResolver);
            task.setOwnerContext(context);
            setResolveStatus(DefaultJSONParser.NONE);
        }
    }

    @SuppressWarnings("rawtypes")
    public Object parseObject(final Map object) {
        return parseObject(object, null);
    }

    public JSONObject parseObject() {
        JSONObject object = new JSONObject();
        parseObject(object);
        return object;
    }

    @SuppressWarnings("rawtypes")
    public final void parseArray(final Collection array) {
        parseArray(array, null);
    }

    @SuppressWarnings({ "unchecked", "rawtypes" })
    public final void parseArray(final Collection array, Object fieldName) {
        final JSONLexer lexer = getLexer();

        if (lexer.token() == JSONToken.SET || lexer.token() == JSONToken.TREE_SET) {
            lexer.nextToken();
        }

        if (lexer.token() != JSONToken.LBRACKET) {
            throw new JSONException("syntax error, expect [, actual " + JSONToken.name(lexer.token()));
        }

        lexer.nextToken(JSONToken.LITERAL_STRING);

        ParseContext context = this.getContext();
        this.setContext(array, fieldName);
        try {
            for (int i = 0;; ++i) {
                if (isEnabled(Feature.AllowArbitraryCommas)) {
                    while (lexer.token() == JSONToken.COMMA) {
                        lexer.nextToken();
                        continue;
                    }
                }

                Object value;
                switch (lexer.token()) {
                    case LITERAL_INT:
                        value = lexer.integerValue();
                        lexer.nextToken(JSONToken.COMMA);
                        break;
                    case LITERAL_FLOAT:
                        if (lexer.isEnabled(Feature.UseBigDecimal)) {
                            value = lexer.decimalValue(true);
                        } else {
                            value = lexer.decimalValue(false);
                        }
                        lexer.nextToken(JSONToken.COMMA);
                        break;
                    case LITERAL_STRING:
                        String stringLiteral = lexer.stringVal();
                        lexer.nextToken(JSONToken.COMMA);

                        if (lexer.isEnabled(Feature.AllowISO8601DateFormat)) {
                            JSONScanner iso8601Lexer = new JSONScanner(stringLiteral);
                            if (iso8601Lexer.scanISO8601DateIfMatch()) {
                                value = iso8601Lexer.getCalendar().getTime();
                            } else {
                                value = stringLiteral;
                            }
                        } else {
                            value = stringLiteral;
                        }

                        break;
                    case TRUE:
                        value = Boolean.TRUE;
                        lexer.nextToken(JSONToken.COMMA);
                        break;
                    case FALSE:
                        value = Boolean.FALSE;
                        lexer.nextToken(JSONToken.COMMA);
                        break;
                    case LBRACE:
                        JSONObject object = new JSONObject();
                        value = parseObject(object, i);
                        break;
                    case LBRACKET:
                        Collection items = new JSONArray();
                        parseArray(items, i);
                        value = items;
                        break;
                    case NULL:
                        value = null;
                        lexer.nextToken(JSONToken.LITERAL_STRING);
                        break;
                    case RBRACKET:
                        lexer.nextToken(JSONToken.COMMA);
                        return;
                    default:
                        value = parse();
                        break;
                }

                array.add(value);
                checkListResolve(array);

                if (lexer.token() == JSONToken.COMMA) {
                    lexer.nextToken(JSONToken.LITERAL_STRING);
                    continue;
                }
            }
        } finally {
            this.setContext(context);
        }
    }

    public ParseContext getContext() {
        return context;
    }

    public List<ResolveTask> getResolveTaskList() {
        return resolveTaskList;
    }

    public void addResolveTask(ResolveTask task) {
        resolveTaskList.add(task);
    }

    public ResolveTask getLastResolveTask() {
        return resolveTaskList.get(resolveTaskList.size() - 1);
    }

    public void setContext(ParseContext context) {
        if (isEnabled(Feature.DisableCircularReferenceDetect)) {
            return;
        }
        this.context = context;
    }

    public void popContext() {
        if (isEnabled(Feature.DisableCircularReferenceDetect)) {
            return;
        }

        this.context = this.context.getParentContext();
        contextArray[contextArrayIndex - 1] = null;
        contextArrayIndex--;
    }

    public ParseContext setContext(Object object, Object fieldName) {
        if (isEnabled(Feature.DisableCircularReferenceDetect)) {
            return null;
        }

        return setContext(this.context, object, fieldName);
    }

    public ParseContext setContext(ParseContext parent, Object object, Object fieldName) {
        if (isEnabled(Feature.DisableCircularReferenceDetect)) {
            return null;
        }
        
        this.context = new ParseContext(parent, object, fieldName);
        addContext(this.context);

        return this.context;
    }
    
    public int getContextLength() {
        return contextArrayIndex;
    }
    
    public void clearContext(ParseContext context, int start) {
        for (int i = start; i < contextArrayIndex; ++i) {
            contextArray[i] = null;
        }
        contextArrayIndex = start;
        this.context = context;
    }

    private void addContext(ParseContext context) {
        int i = contextArrayIndex++;
        if (i >= contextArray.length) {
            int newLen = (contextArray.length * 3) / 2;
            ParseContext[] newArray = new ParseContext[newLen];
            System.arraycopy(contextArray, 0, newArray, 0, contextArray.length);
            contextArray = newArray;
        }
        contextArray[i] = context;
    }

    public Object parse() {
        return parse(null);
    }

    public Object parse(Object fieldName) {
        final JSONLexer lexer = getLexer();
        switch (lexer.token()) {
            case SET:
                lexer.nextToken();
                HashSet<Object> set = new HashSet<Object>();
                parseArray(set, fieldName);
                return set;
            case TREE_SET:
                lexer.nextToken();
                TreeSet<Object> treeSet = new TreeSet<Object>();
                parseArray(treeSet, fieldName);
                return treeSet;
            case LBRACKET:
                JSONArray array = new JSONArray();
                parseArray(array, fieldName);
                return array;
            case LBRACE:
                JSONObject object = new JSONObject();
                return parseObject(object, fieldName);
            case LITERAL_INT:
                Number intValue = lexer.integerValue();
                lexer.nextToken();
                return intValue;
            case LITERAL_FLOAT:
                Object value = lexer.decimalValue(isEnabled(Feature.UseBigDecimal));
                lexer.nextToken();
                return value;
            case LITERAL_STRING:
                String stringLiteral = lexer.stringVal();
                lexer.nextToken(JSONToken.COMMA);

                if (lexer.isEnabled(Feature.AllowISO8601DateFormat)) {
                    JSONScanner iso8601Lexer = new JSONScanner(stringLiteral);
                    if (iso8601Lexer.scanISO8601DateIfMatch()) {
                        return iso8601Lexer.getCalendar().getTime();
                    }
                }

                return stringLiteral;
            case NULL:
                lexer.nextToken();
                return null;
            case TRUE:
                lexer.nextToken();
                return Boolean.TRUE;
            case FALSE:
                lexer.nextToken();
                return Boolean.FALSE;
            case NEW:
                lexer.nextToken(JSONToken.IDENTIFIER);

                if (lexer.token() != JSONToken.IDENTIFIER) {
                    throw new JSONException("syntax error");
                }
                lexer.nextToken(JSONToken.LPAREN);

                accept(JSONToken.LPAREN);
                long time = ((Number) lexer.integerValue()).longValue();
                accept(JSONToken.LITERAL_INT);

                accept(JSONToken.RPAREN);

                return new Date(time);
            case EOF:
                if (lexer.isBlankInput()) {
                    return null;
                }
                throw new JSONException("unterminated json string, pos " + lexer.getBufferPosition());
            case ERROR:
            default:
                throw new JSONException("syntax error, pos " + lexer.getBufferPosition());
        }
    }

    public void config(Feature feature, boolean state) {
        getLexer().config(feature, state);
    }

    public boolean isEnabled(Feature feature) {
        return getLexer().isEnabled(feature);
    }

    public JSONLexer getLexer() {
        return lexer;
    }

    public final void accept(final int token) {
        final JSONLexer lexer = getLexer();
        if (lexer.token() == token) {
            lexer.nextToken();
        } else {
            throw new JSONException("syntax error, expect " + JSONToken.name(token) + ", actual "
                                    + JSONToken.name(lexer.token()));
        }
    }

    public void close() {
        final JSONLexer lexer = getLexer();

        try {
            if (isEnabled(Feature.AutoCloseSource)) {
                if (!lexer.isEOF()) {
                    throw new JSONException("not close json text, token : " + JSONToken.name(lexer.token()));
                }
            }
        } finally {
            lexer.close();
        }
    }

    public static class ResolveTask {

        private final ParseContext context;
        private final String       referenceValue;
        private FieldDeserializer  fieldDeserializer;
        private ParseContext       ownerContext;

        public ResolveTask(ParseContext context, String referenceValue){
            this.context = context;
            this.referenceValue = referenceValue;
        }

        public ParseContext getContext() {
            return context;
        }

        public String getReferenceValue() {
            return referenceValue;
        }

        public FieldDeserializer getFieldDeserializer() {
            return fieldDeserializer;
        }

        public void setFieldDeserializer(FieldDeserializer fieldDeserializer) {
            this.fieldDeserializer = fieldDeserializer;
        }

        public ParseContext getOwnerContext() {
            return ownerContext;
        }

        public void setOwnerContext(ParseContext ownerContext) {
            this.ownerContext = ownerContext;
        }

    }

}