/mcs/class/System.Web.Extensions/System.Web.Script.Serialization/JavaScriptSerializer.cs
C# | 443 lines | 326 code | 78 blank | 39 comment | 108 complexity | ef2d3ea8918e89173c5fe785ebce7ef4 MD5 | raw file
Possible License(s): Unlicense, Apache-2.0, LGPL-2.0, MPL-2.0-no-copyleft-exception, CC-BY-SA-3.0, GPL-2.0
- //
- // JavaScriptSerializer.cs
- //
- // Authors:
- // Konstantin Triger <kostat@mainsoft.com>
- // Marek Safar <marek.safar@gmail.com>
- //
- // (C) 2007 Mainsoft, Inc. http://www.mainsoft.com
- // Copyright 2012 Xamarin Inc.
- //
- // Permission is hereby granted, free of charge, to any person obtaining
- // a copy of this software and associated documentation files (the
- // "Software"), to deal in the Software without restriction, including
- // without limitation the rights to use, copy, modify, merge, publish,
- // distribute, sublicense, and/or sell copies of the Software, and to
- // permit persons to whom the Software is furnished to do so, subject to
- // the following conditions:
- //
- // The above copyright notice and this permission notice shall be
- // included in all copies or substantial portions of the Software.
- //
- // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
- // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
- // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- //
- using System;
- using System.Collections.Generic;
- using System.Text;
- using Newtonsoft.Json;
- using System.IO;
- using System.Collections;
- using System.Reflection;
- using Newtonsoft.Json.Utilities;
- using System.ComponentModel;
- using System.Configuration;
- using System.Web.Configuration;
- namespace System.Web.Script.Serialization
- {
- public class JavaScriptSerializer
- {
- internal const string SerializedTypeNameKey = "__type";
-
- List<IEnumerable<JavaScriptConverter>> _converterList;
- int _maxJsonLength;
- int _recursionLimit;
- JavaScriptTypeResolver _typeResolver;
- internal static readonly JavaScriptSerializer DefaultSerializer = new JavaScriptSerializer (null, false);
- public JavaScriptSerializer () : this (null, false)
- {
- }
- public JavaScriptSerializer (JavaScriptTypeResolver resolver) : this (resolver, false)
- {
- }
-
- internal JavaScriptSerializer (JavaScriptTypeResolver resolver, bool registerConverters)
- {
- _typeResolver = resolver;
- ScriptingJsonSerializationSection section = (ScriptingJsonSerializationSection) ConfigurationManager.GetSection ("system.web.extensions/scripting/webServices/jsonSerialization");
- if (section == null) {
- #if NET_3_5
- _maxJsonLength = 2097152;
- #else
- _maxJsonLength = 102400;
- #endif
- _recursionLimit = 100;
- } else {
- _maxJsonLength = section.MaxJsonLength;
- _recursionLimit = section.RecursionLimit;
- if (registerConverters) {
- ConvertersCollection converters = section.Converters;
- if (converters != null && converters.Count > 0) {
- var cvtlist = new List <JavaScriptConverter> ();
- Type type;
- string typeName;
- JavaScriptConverter jsc;
-
- foreach (Converter cvt in converters) {
- typeName = cvt != null ? cvt.Type : null;
- if (typeName == null)
- continue;
-
- type = HttpApplication.LoadType (typeName, true);
- if (type == null || !typeof (JavaScriptConverter).IsAssignableFrom (type))
- continue;
-
- jsc = Activator.CreateInstance (type) as JavaScriptConverter;
- cvtlist.Add (jsc);
- }
-
- RegisterConverters (cvtlist);
- }
- }
- }
- }
-
- public int MaxJsonLength {
- get {
- return _maxJsonLength;
- }
- set {
- _maxJsonLength = value;
- }
- }
-
- public int RecursionLimit {
- get {
- return _recursionLimit;
- }
- set {
- _recursionLimit = value;
- }
- }
- internal JavaScriptTypeResolver TypeResolver {
- get { return _typeResolver; }
- }
-
- public T ConvertToType<T> (object obj) {
- if (obj == null)
- return default (T);
- return (T) ConvertToType (obj, typeof (T));
- }
- #if NET_4_0
- public
- #else
- internal
- #endif
- object ConvertToType (object obj, Type targetType)
- {
- if (obj == null)
- return null;
- if (obj is IDictionary<string, object>) {
- if (targetType == null)
- obj = EvaluateDictionary ((IDictionary<string, object>) obj);
- else {
- JavaScriptConverter converter = GetConverter (targetType);
- if (converter != null)
- return converter.Deserialize (
- EvaluateDictionary ((IDictionary<string, object>) obj),
- targetType, this);
- }
- return ConvertToObject ((IDictionary<string, object>) obj, targetType);
- }
- if (obj is ArrayList)
- return ConvertToList ((ArrayList) obj, targetType);
- if (targetType == null)
- return obj;
- Type sourceType = obj.GetType ();
- if (targetType.IsAssignableFrom (sourceType))
- return obj;
- if (targetType.IsEnum)
- if (obj is string)
- return Enum.Parse (targetType, (string) obj, true);
- else
- return Enum.ToObject (targetType, obj);
- TypeConverter c = TypeDescriptor.GetConverter (targetType);
- if (c.CanConvertFrom (sourceType)) {
- if (obj is string)
- return c.ConvertFromInvariantString ((string) obj);
- return c.ConvertFrom (obj);
- }
- /*
- * Take care of the special case whereas in JSON an empty string ("") really means
- * an empty value
- * (see: https://bugzilla.novell.com/show_bug.cgi?id=328836)
- */
- if ((targetType.IsGenericType) && (targetType.GetGenericTypeDefinition() == typeof(Nullable<>)))
- {
- string s = obj as String;
- if (String.IsNullOrEmpty(s))
- return null;
- }
- return Convert.ChangeType (obj, targetType);
- }
- public T Deserialize<T> (string input) {
- return ConvertToType<T> (DeserializeObjectInternal(input));
- }
- static object Evaluate (object value) {
- return Evaluate (value, false);
- }
- static object Evaluate (object value, bool convertListToArray) {
- if (value is IDictionary<string, object>)
- value = EvaluateDictionary ((IDictionary<string, object>) value, convertListToArray);
- else if (value is ArrayList)
- value = EvaluateList ((ArrayList) value, convertListToArray);
- return value;
- }
- static object EvaluateList (ArrayList e) {
- return EvaluateList (e, false);
- }
- static object EvaluateList (ArrayList e, bool convertListToArray) {
- ArrayList list = new ArrayList ();
- foreach (object value in e)
- list.Add (Evaluate (value, convertListToArray));
- return convertListToArray ? (object) list.ToArray () : list;
- }
- static IDictionary<string, object> EvaluateDictionary (IDictionary<string, object> dict) {
- return EvaluateDictionary (dict, false);
- }
- static IDictionary<string, object> EvaluateDictionary (IDictionary<string, object> dict, bool convertListToArray) {
- Dictionary<string, object> d = new Dictionary<string, object> (StringComparer.Ordinal);
- foreach (KeyValuePair<string, object> entry in dict) {
- d.Add (entry.Key, Evaluate (entry.Value, convertListToArray));
- }
- return d;
- }
- static readonly Type typeofObject = typeof(object);
- static readonly Type typeofGenList = typeof (List<>);
- object ConvertToList (ArrayList col, Type type) {
- Type elementType = null;
- if (type != null && type.HasElementType)
- elementType = type.GetElementType ();
- IList list;
- if (type == null || type.IsArray || typeofObject == type || typeof (ArrayList).IsAssignableFrom (type))
- list = new ArrayList ();
- else if (ReflectionUtils.IsInstantiatableType (type))
- // non-generic typed list
- list = (IList) Activator.CreateInstance (type, true);
- else if (ReflectionUtils.IsAssignable (type, typeofGenList)) {
- if (type.IsGenericType) {
- Type [] genArgs = type.GetGenericArguments ();
- elementType = genArgs [0];
- // generic list
- list = (IList) Activator.CreateInstance (typeofGenList.MakeGenericType (genArgs));
- } else
- list = new ArrayList ();
- } else
- throw new InvalidOperationException (String.Format ("Deserializing list type '{0}' not supported.", type.GetType ().Name));
- if (list.IsReadOnly) {
- EvaluateList (col);
- return list;
- }
-
- if (elementType == null)
- elementType = typeof (object);
- foreach (object value in col)
- list.Add (ConvertToType (value, elementType));
- if (type != null && type.IsArray)
- list = ((ArrayList) list).ToArray (elementType);
- return list;
- }
- object ConvertToObject (IDictionary<string, object> dict, Type type)
- {
- if (_typeResolver != null) {
- if (dict.Keys.Contains(SerializedTypeNameKey)) {
- // already Evaluated
- type = _typeResolver.ResolveType ((string) dict [SerializedTypeNameKey]);
- }
- }
- if (type.IsGenericType) {
- if (type.GetGenericTypeDefinition ().IsAssignableFrom (typeof (IDictionary <,>))) {
- Type[] arguments = type.GetGenericArguments ();
- if (arguments == null || arguments.Length != 2 || (arguments [0] != typeof (object) && arguments [0] != typeof (string)))
- throw new InvalidOperationException (
- "Type '" + type + "' is not not supported for serialization/deserialization of a dictionary, keys must be strings or objects.");
- if (type.IsAbstract) {
- Type dictType = typeof (Dictionary <,>);
- type = dictType.MakeGenericType (arguments [0], arguments [1]);
- }
- }
- } else if (type.IsAssignableFrom (typeof (IDictionary)))
- type = typeof (Dictionary <string, object>);
-
- object target = Activator.CreateInstance (type, true);
- foreach (KeyValuePair<string, object> entry in dict) {
- object value = entry.Value;
- if (target is IDictionary) {
- Type valueType = ReflectionUtils.GetTypedDictionaryValueType (type);
- if (value != null && valueType == typeof (System.Object))
- valueType = value.GetType ();
-
- ((IDictionary) target).Add (entry.Key, ConvertToType (value, valueType));
- continue;
- }
- MemberInfo [] memberCollection = type.GetMember (entry.Key, BindingFlags.Public | BindingFlags.Instance | BindingFlags.IgnoreCase);
- if (memberCollection == null || memberCollection.Length == 0) {
- //must evaluate value
- Evaluate (value);
- continue;
- }
- MemberInfo member = memberCollection [0];
- if (!ReflectionUtils.CanSetMemberValue (member)) {
- //must evaluate value
- Evaluate (value);
- continue;
- }
- Type memberType = ReflectionUtils.GetMemberUnderlyingType (member);
- if (memberType.IsInterface) {
- if (memberType.IsGenericType)
- memberType = ResolveGenericInterfaceToType (memberType);
- else
- memberType = ResolveInterfaceToType (memberType);
- if (memberType == null)
- throw new InvalidOperationException ("Unable to deserialize a member, as its type is an unknown interface.");
- }
-
- ReflectionUtils.SetMemberValue (member, target, ConvertToType(value, memberType));
- }
- return target;
- }
- Type ResolveGenericInterfaceToType (Type type)
- {
- Type[] genericArgs = type.GetGenericArguments ();
-
- if (ReflectionUtils.IsSubClass (type, typeof (IDictionary <,>)))
- return typeof (Dictionary <,>).MakeGenericType (genericArgs);
- if (ReflectionUtils.IsSubClass (type, typeof (IList <>)) ||
- ReflectionUtils.IsSubClass (type, typeof (ICollection <>)) ||
- ReflectionUtils.IsSubClass (type, typeof (IEnumerable <>))
- )
- return typeof (List <>).MakeGenericType (genericArgs);
- if (ReflectionUtils.IsSubClass (type, typeof (IComparer <>)))
- return typeof (Comparer <>).MakeGenericType (genericArgs);
- if (ReflectionUtils.IsSubClass (type, typeof (IEqualityComparer <>)))
- return typeof (EqualityComparer <>).MakeGenericType (genericArgs);
- return null;
- }
- Type ResolveInterfaceToType (Type type)
- {
- if (typeof (IDictionary).IsAssignableFrom (type))
- return typeof (Hashtable);
- if (typeof (IList).IsAssignableFrom (type) ||
- typeof (ICollection).IsAssignableFrom (type) ||
- typeof (IEnumerable).IsAssignableFrom (type))
- return typeof (ArrayList);
- if (typeof (IComparer).IsAssignableFrom (type))
- return typeof (Comparer);
- return null;
- }
-
- public object DeserializeObject (string input) {
- object obj = Evaluate (DeserializeObjectInternal (input), true);
- IDictionary dictObj = obj as IDictionary;
- if (dictObj != null && dictObj.Contains(SerializedTypeNameKey)){
- if (_typeResolver == null) {
- throw new ArgumentNullException ("resolver", "Must have a type resolver to deserialize an object that has an '__type' member");
- }
- obj = ConvertToType(obj, null);
- }
- return obj;
- }
- internal object DeserializeObjectInternal (string input) {
- return Json.Deserialize (input, this);
- }
- internal object DeserializeObjectInternal (TextReader input) {
- return Json.Deserialize (input, this);
- }
- public void RegisterConverters (IEnumerable<JavaScriptConverter> converters) {
- if (converters == null)
- throw new ArgumentNullException ("converters");
- if (_converterList == null)
- _converterList = new List<IEnumerable<JavaScriptConverter>> ();
- _converterList.Add (converters);
- }
- internal JavaScriptConverter GetConverter (Type type) {
- if (_converterList != null)
- for (int i = 0; i < _converterList.Count; i++) {
- foreach (JavaScriptConverter converter in _converterList [i])
- foreach (Type supportedType in converter.SupportedTypes)
- if (supportedType.IsAssignableFrom (type))
- return converter;
- }
- return null;
- }
- public string Serialize (object obj) {
- StringBuilder b = new StringBuilder ();
- Serialize (obj, b);
- return b.ToString ();
- }
- public void Serialize (object obj, StringBuilder output) {
- Json.Serialize (obj, this, output);
- }
- internal void Serialize (object obj, TextWriter output) {
- Json.Serialize (obj, this, output);
- }
- }
- }