internal static BlockExpression Build(Type type)
{
Type keyType = type.GetGenericArguments()[0];
Type valueType = type.GetGenericArguments()[1];
List <Expression> methodCall = new List <Expression>();
Type keyValuePairType = typeof(KeyValuePair <,>).MakeGenericType(keyType, valueType);
LabelTarget returnValueLable = Expression.Label(keyValuePairType, "returnValue");
ConstructorInfo ctor = keyValuePairType.GetConstructor(new[] { keyType, valueType });
ParameterExpression key = Expression.Variable(keyType, "key");
ParameterExpression value = Expression.Variable(valueType, "value");
/*
* ReadObjLeft()
*/
methodCall.Add(Expression.Call(ExpressionMembers.Reader, JsonReader._ReadObjLeft));
/*
* if(reader.ReadBoolObjRight)
* return new KeyValuePair<,>(default,default);
*/
methodCall.Add(
Expression.IfThen(
Expression.Call(ExpressionMembers.Reader, JsonReader._ReadBoolObjRight),
Expression.Return(returnValueLable, Expression.New(ctor, keyType.IsValueType ? (Expression)Expression.New(keyType) : Expression.Constant(null, keyType), valueType.IsValueType ? (Expression)Expression.New(valueType) : Expression.Constant(null, valueType)))));
/*
* ReadKey()
*/
methodCall.Add(ExpressionMembers.GenerateKeyValuePairByReadKey(keyType, key));
/*
* reader.ReadColon()
*/
methodCall.Add(Expression.Call(ExpressionMembers.Reader, JsonReader._ReadColon));
/*
* value = ResolveProvider<ValueType>.InvokeGet(reader, handler);
*/
methodCall.Add(Expression.Assign(value, ExpressionMembers.GetMethodCall(valueType)));
/*
* reader.ReadObjRight();
*/
methodCall.Add(Expression.Call(ExpressionMembers.Reader, JsonReader._ReadObjRight));
/*
* return new KeyValuePair<,>(key,value);
*/
methodCall.Add(Expression.Return(returnValueLable, Expression.New(ctor, key, value)));
methodCall.Add(Expression.Label(returnValueLable, Expression.New(ctor, key, value)));
return(Expression.Block(new[] { key, value }, methodCall));
}
internal static BlockExpression Build(Type defindType, Type instanceType, Type convertType, Type keyType, Type valueType)
{
/*
* defind:ExpandoObject new:ExpandoObject convert:IDictionary<string, object>
* ExpandoObject ss = new ExpandoObject();
* IDictionary<string, object> dic = (IDictionary<string, object>)ss;
*
* hashtable
*/
Expression[] methodDictionaryCall = new Expression[9];
LabelTarget returnTarget = Expression.Label(defindType, "returnLable");
Expression ifReadNullOrObjLeftReturnNull;
if (!defindType.IsValueType)
{
/*
* if (reader.ReadNullOrObjLeft())
* return null;
*/
ifReadNullOrObjLeftReturnNull = Expression.IfThen(Expression.Call(ExpressionMembers.Reader, JsonReader._ReadNullOrObjLeft), Expression.Return(returnTarget, Expression.Constant(null, defindType)));
}
else
{
ifReadNullOrObjLeftReturnNull = Expression.Call(ExpressionMembers.Reader, JsonReader._ReadObjLeft);
}
methodDictionaryCall[0] = ifReadNullOrObjLeftReturnNull;
/*
* Dictionary<> dictionary =new Dictionary<>();
*/
NewExpression dictionaryCtor = Expression.New(instanceType);
ParameterExpression dictionary = Expression.Variable(defindType, "dictionary");
methodDictionaryCall[1] = Expression.Assign(dictionary, dictionaryCtor);
/*
* if(reader.ReadBoolObjRight)
* return dictionary;
*/
methodDictionaryCall[2] = (Expression.IfThen(Expression.Call(ExpressionMembers.Reader, JsonReader._ReadBoolObjRight), Expression.Return(returnTarget, dictionary)));
/*
* IDictionary iDic = dictionary;
* IDictionary<,> iDic = dictionary;
*/
MethodInfo iDicAdd = convertType.GetMethod("Add");
ParameterExpression iDic = Expression.Variable(convertType, "iDic");
methodDictionaryCall[3] = Expression.Assign(iDic, Expression.Convert(dictionary, convertType));
/*
* int moveNext=2;
*/
methodDictionaryCall[4] = ExpressionMembers.MoveNextAssignOne;
ParameterExpression key = Expression.Variable(keyType, "key");
ParameterExpression value = Expression.Variable(valueType, "value");
/*
* while(moveNext-->0)
* {}
*/
LabelTarget loopBreak = Expression.Label("loopBreak");
LoopExpression loopExpression = Expression.Loop(Expression.IfThenElse(ExpressionMembers.MoveNextDecrement,
ReturnFunc <Expression>(() =>
{
Expression[] methodCall = new Expression[5];
/*
* ReadKey()
*/
methodCall[0] = ExpressionMembers.GenerateKeyValuePairByReadKey(keyType, key);
/*
* reader.ReadColon()
*/
methodCall[1] = (Expression.Call(ExpressionMembers.Reader, JsonReader._ReadColon));
/*
* value = ResolveProvider<ValueType>.InvokeGet(reader, handler);
*/
methodCall[2] = (Expression.Assign(value, ExpressionMembers.GetMethodCall(valueType)));
/*
* iDic.Add(key,value);
*/
methodCall[3] = (Expression.Call(iDic, iDicAdd, key, value));
/*
* if(reader.ReadComma()==true)
* moveNext++;
*/
methodCall[4] = (ExpressionMembers.IfReadBoolCommaIsTrueSoMoveNextIncrement);
return(Expression.Block(methodCall));;
})
, Expression.Break(loopBreak)));
methodDictionaryCall[5] = Expression.Block(loopExpression, Expression.Label(loopBreak));
/*
* reader.ReadObjRight();
*/
methodDictionaryCall[6] = Expression.Call(ExpressionMembers.Reader, JsonReader._ReadObjRight);
/*
* return dictionary
*/
GotoExpression returnExpression = Expression.Return(returnTarget, dictionary);
LabelExpression returnLabel = Expression.Label(returnTarget, dictionary);
methodDictionaryCall[7] = returnExpression;
methodDictionaryCall[8] = returnLabel;
return(Expression.Block(new[] { iDic, dictionary, key, value, ExpressionMembers.MoveNext }, methodDictionaryCall));
}