67 lines
2.7 KiB
C#
67 lines
2.7 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq.Expressions;
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using System.Reflection;
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namespace CPF.Windows.Json.Deserialize
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{
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[ExpressionBuildType(DeserializeBuildTypeEnum.KeyValuePair)]
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internal class KeyValuePairBuild : ExpressionJsonResolve
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{
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internal static BlockExpression Build(Type type)
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{
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Type keyType = type.GetGenericArguments()[0];
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Type valueType = type.GetGenericArguments()[1];
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List<Expression> methodCall = new List<Expression>();
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Type keyValuePairType = typeof(KeyValuePair<,>).MakeGenericType(keyType, valueType);
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LabelTarget returnValueLable = Expression.Label(keyValuePairType, "returnValue");
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ConstructorInfo ctor = keyValuePairType.GetConstructor(new[] { keyType, valueType });
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ParameterExpression key = Expression.Variable(keyType, "key");
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ParameterExpression value = Expression.Variable(valueType, "value");
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/*
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ReadObjLeft()
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*/
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methodCall.Add(Expression.Call(ExpressionMembers.Reader, JsonReader._ReadObjLeft));
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/*
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if(reader.ReadBoolObjRight)
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return new KeyValuePair<,>(default,default);
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*/
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methodCall.Add(
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Expression.IfThen(
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Expression.Call(ExpressionMembers.Reader, JsonReader._ReadBoolObjRight),
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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)))));
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/*
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ReadKey()
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*/
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methodCall.Add(ExpressionMembers.GenerateKeyValuePairByReadKey(keyType, key));
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/*
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reader.ReadColon()
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*/
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methodCall.Add(Expression.Call(ExpressionMembers.Reader, JsonReader._ReadColon));
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/*
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value = ResolveProvider<ValueType>.InvokeGet(reader, handler);
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*/
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methodCall.Add(Expression.Assign(value, ExpressionMembers.GetMethodCall(valueType)));
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/*
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reader.ReadObjRight();
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*/
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methodCall.Add(Expression.Call(ExpressionMembers.Reader, JsonReader._ReadObjRight));
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/*
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return new KeyValuePair<,>(key,value);
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*/
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methodCall.Add(Expression.Return(returnValueLable, Expression.New(ctor, key, value)));
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methodCall.Add(Expression.Label(returnValueLable, Expression.New(ctor, key, value)));
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return Expression.Block(new[] { key, value }, methodCall);
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}
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}
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}
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