private static void DefineDeserialize <T>(ILGenerator gen)
{
PropertyInfo[] properties = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);
Dictionary <Type, LocalBuilder> localByType = new Dictionary <Type, LocalBuilder>();
ConstructorInfo?constructorInfo = typeof(T).GetConstructor(Type.EmptyTypes);
bool isDefaultConstructor;
if (constructorInfo != null)
{
isDefaultConstructor = true;
}
else
{
Type[] expectedConstructorSignature = properties.Select(prop => prop.PropertyType).ToArray();
constructorInfo = typeof(T).GetConstructor(expectedConstructorSignature) ?? throw new CsvTypeException(typeof(T), "No suitable constructor found.");
isDefaultConstructor = false;
}
gen
.DeclareLocal <bool>(out LocalBuilder firstRow)
.DeclareLocal <List <object> >(out LocalBuilder items)
.DeclareLocal <List <ReadOnlyMemory <char> > >(out LocalBuilder columns)
.DeclareLocal <int>(out LocalBuilder endOfLine)
.DeclareLocal <string>(out LocalBuilder excMessage)
.DeclareLocal <T>(out LocalBuilder obj)
.DeclareLocal <ReadOnlyMemory <char> >(out LocalBuilder col)
.Ldc_I4_1()
.Stloc(firstRow)
.Newobj(typeof(List <Object>).GetConstructor(Type.EmptyTypes) !)
.Stloc(items)
.Label(out Label beginLoop)
.Ldarg(4); // csv
gen.CallvirtPropertyGet <ReadOnlyMemory <char> >("Length")
.Brfalse(out Label endLoop)
.Ldarga_S(4) // csv
.Ldarg_2(); // delimiter
gen.Call(typeof(StringSplitter).GetMethod("ReadNextLine", new Type[] { typeof(ReadOnlyMemory <char>).MakeByRefType(), typeof(char) }) !)
.Stloc(columns)
.Ldarg_3() // skipHeader
.Brfalse_S(out Label dontSkipHeader)
.Ldloc(firstRow)
.Brfalse_S(dontSkipHeader)
.Ldnull()
.Stloc(firstRow)
.Br_S(beginLoop)
.Label(dontSkipHeader)
.Ldc_I4_X(properties.Length)
.Ldloc(columns);
gen.CallvirtPropertyGet <List <ReadOnlyMemory <char> > >("Count")
.Ceq()
.Brtrue_S(out Label validated)
.Ldarg(4)
.Ldc_I4_S((byte)'\n');
gen.Call(typeof(ReadOnlyMemoryHelper).GetMethod("IndexOf", new Type[] { typeof(ReadOnlyMemory <char>), typeof(char) }) !)
.Stloc(endOfLine)
.Ldloc(endOfLine)
.Ldc_I4_M1()
.Ceq()
.Brfalse_S(out Label splitMemory)
.Ldarg(4);
gen.Callvirt <ReadOnlyMemory <char> >("ToString")
.Stloc(excMessage)
.Br_S(out Label throwExc)
.Label(splitMemory)
.Ldarg(4)
.Ldc_I4_0()
.Ldloc(endOfLine);
gen.Call <ReadOnlyMemory <char> >("Slice", typeof(int), typeof(int));
gen.Callvirt <ReadOnlyMemory <char> >("ToString")
.Stloc(excMessage)
.Label(throwExc)
.Ldtoken <T>()
.Ldloc(excMessage)
.Ldstr($"Row must consists of {properties.Length} columns.")
.Initobj <CsvFormatException>()
.Throw()
.Label(validated)
.Emit(gen => {
if (isDefaultConstructor)
{
gen
.Newobj(constructorInfo)
.Stloc(obj)
.Ldloc(obj);
}
})
.Emit(gen => {
for (int i = 0; i < properties.Length; i++)
{
Type propertyType = properties[i].PropertyType;
CsvColumnAttribute?columnAttribute = properties[i].GetCustomAttribute <CsvColumnAttribute>();
IConverterEmitter converterEmitter = ConverterFactory.GetOrCreateEmitter(propertyType);
ConverterEmitterAttribute converterEmitterAttribute = converterEmitter.GetType().GetMethod("EmitDeserialize") !.GetCustomAttribute <ConverterEmitterAttribute>() !;
LocalBuilder?local = null;
LocalBuilder?secondaryLocal = null;
if (converterEmitterAttribute.PrimaryLocalType is Type localType)
{
if (!localByType.TryGetValue(localType, out local))
{
local = gen.DeclareLocal(localType);
localByType.Add(localType, local);
}
}
if (converterEmitterAttribute.SecondaryLocalType is Type secondaryLocalType)
{
if (!localByType.TryGetValue(secondaryLocalType, out secondaryLocal))
{
secondaryLocal = gen.DeclareLocal(secondaryLocalType);
localByType.Add(secondaryLocalType, secondaryLocal);
}
}
gen
.Emit(gen => {
if (isDefaultConstructor)
{
gen.Ldloc(obj);
}
})
.Ldloc(columns)
.Ldc_I4_X(i);
gen.Callvirt(typeof(List <ReadOnlyMemory <char> >).GetProperties(BindingFlags.Public | BindingFlags.Instance).Single(prop => prop.GetIndexParameters().Length > 0).GetGetMethod() !)
.Stloc(col)
.Ldloc(col)
.Emit(gen => converterEmitter.EmitDeserialize(gen, local, secondaryLocal, columnAttribute))
.Emit(gen => {
if (isDefaultConstructor)
{
gen
.Callvirt(properties[i].GetSetMethod() !);
}
});
}
})
.Emit(gen => {
if (!isDefaultConstructor)
{
gen
.Newobj(constructorInfo);
}
})
.Stloc(obj)
.Ldloc(items)
.Ldloc(obj);
gen.Callvirt <List <object> >("Add", typeof(object))
.Br(beginLoop)
.Label(endLoop)
.Ldloc(items)
.Ret();
}
private static void DefineSerializeItem <T>(ILGenerator gen)
{
PropertyInfo[] properties = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);
Dictionary <Type, LocalBuilder> localByType = new Dictionary <Type, LocalBuilder>();
gen
.Ldarg_3()
.Emit(gen => {
bool firstProperty = true;
foreach (PropertyInfo property in properties)
{
if (!property.CanRead)
{
throw new CsvTypeException(typeof(T), property.Name, "Property doesn't have a public getter.");
}
CsvColumnAttribute?columnAttribute = property.GetCustomAttribute <CsvColumnAttribute>();
gen
.Emit(gen => firstProperty switch {
false => gen
.Ldarg_2()
.Callvirt <StringBuilder>("Append", typeof(char)),
_ => gen
})
.Emit(gen => gen
.Ldarg(4)
.Callvirt(property.GetGetMethod() !)
.Emit(gen => {
IConverterEmitter converterEmitter = ConverterFactory.GetOrCreateEmitter(property.PropertyType);
ConverterEmitterAttribute converterEmitterAttribute = converterEmitter.GetType().GetMethod("EmitAppendToStringBuilder") !.GetCustomAttribute <ConverterEmitterAttribute>() !;
LocalBuilder?local = null;
LocalBuilder?secondaryLocal = null;
if (converterEmitterAttribute.NullableOfGenericParameterIsPrimaryLocalType && converterEmitter.GetType().IsGenericType)
{
Type genericParameter = converterEmitter.GetType().GetGenericArguments()[0];
Type localType = typeof(Nullable <>).MakeGenericType(genericParameter);
if (!localByType.TryGetValue(localType, out local))
{
local = gen.DeclareLocal(localType);
localByType.Add(localType, local);
}
}
else if (converterEmitterAttribute.GenericParameterIsPrimaryLocalType && converterEmitter.GetType().IsGenericType)
{
Type localType = converterEmitter.GetType().GetGenericArguments()[0];
if (!localByType.TryGetValue(localType, out local))
{
local = gen.DeclareLocal(localType);
localByType.Add(localType, local);
}
}
else if (converterEmitterAttribute.PrimaryLocalType is Type localType)
{
if (!localByType.TryGetValue(localType, out local))
{
local = gen.DeclareLocal(localType);
localByType.Add(localType, local);
}
}
if (converterEmitterAttribute.SecondaryLocalType is Type secondaryLocalType)
{
if (!localByType.TryGetValue(secondaryLocalType, out secondaryLocal))
{
secondaryLocal = gen.DeclareLocal(secondaryLocalType);
localByType.Add(secondaryLocalType, secondaryLocal);
}
}
converterEmitter.EmitAppendToStringBuilder(gen, local, secondaryLocal, columnAttribute);
})
);
firstProperty = false;
}