/// <summary>
/// Builds a <see cref="BinarySerializer{T}" /> for an <see cref="EnumSchema" />.
/// </summary>
/// <returns>
/// A successful <see cref="BinarySerializerBuilderCaseResult" /> if <paramref name="schema" />
/// is an <see cref="EnumSchema" />; an unsuccessful <see cref="BinarySerializerBuilderCaseResult" />
/// otherwise.
/// </returns>
/// <exception cref="UnsupportedTypeException">
/// Thrown when <paramref name="type" /> is an enum type and <paramref name="schema" />
/// does not have a matching symbol for each member or when <paramref name="type" /> cannot
/// be converted to <see cref="string" />.
/// </exception>
/// <inheritdoc />
public virtual BinarySerializerBuilderCaseResult BuildExpression(Expression value, Type type, Schema schema, BinarySerializerBuilderContext context)
{
if (schema is EnumSchema enumSchema)
{
var writeInteger = typeof(BinaryWriter)
.GetMethod(nameof(BinaryWriter.WriteInteger), new[] { typeof(long) });
var underlying = Nullable.GetUnderlyingType(type) ?? type;
// enum fields will always be public static, so no need to expose binding flags:
var fields = type.GetFields(BindingFlags.Public | BindingFlags.Static);
var symbols = enumSchema.Symbols.ToList();
var cases = type.IsEnum
? fields
.Select(field =>
{
var index = symbols.FindIndex(symbol => IsMatch(symbol, field));
if (index < 0)
{
throw new UnsupportedTypeException(type, $"{type} has a field {field.Name} that cannot be serialized.");
}
if (symbols.FindLastIndex(symbol => IsMatch(symbol, field)) != index)
{
throw new UnsupportedTypeException(type, $"{type} has an ambiguous field {field.Name}.");
}
return(Expression.SwitchCase(
Expression.Call(context.Writer, writeInteger, Expression.Constant((long)index)),
Expression.Constant(Enum.Parse(type, field.Name))));
})
: symbols
.Select((symbol, index) =>
{
return(Expression.SwitchCase(
Expression.Call(context.Writer, writeInteger, Expression.Constant((long)index)),
Expression.Constant(symbol)));
});
var exceptionConstructor = typeof(ArgumentOutOfRangeException)
.GetConstructor(new[] { typeof(string) });
var exception = Expression.New(exceptionConstructor, Expression.Constant("Enum value out of range."));
var intermediate = Expression.Variable(type.IsEnum ? type : typeof(string));
return(BinarySerializerBuilderCaseResult.FromExpression(
Expression.Block(
new[] { intermediate },
Expression.Assign(intermediate, BuildConversion(value, intermediate.Type)),
Expression.Switch(intermediate, Expression.Throw(exception), cases.ToArray()))));
}
else
{
return(BinarySerializerBuilderCaseResult.FromException(new UnsupportedSchemaException(schema, $"{nameof(BinaryEnumSerializerBuilderCase)} can only be applied to {nameof(EnumSchema)}s.")));
}
}
/// <summary>
/// Builds a <see cref="BinarySerializer{T}" /> for a <see cref="DurationLogicalType" />.
/// </summary>
/// <returns>
/// A successful <see cref="BinarySerializerBuilderCaseResult" /> if <paramref name="schema" />
/// has a <see cref="DurationLogicalType" />; an unsuccessful <see cref="BinarySerializerBuilderCaseResult" />
/// otherwise.
/// </returns>
/// <exception cref="UnsupportedSchemaException">
/// Thrown when <paramref name="schema" /> is not a <see cref="FixedSchema" /> with size
/// <c>12</c>.
/// </exception>
/// <exception cref="UnsupportedTypeException">
/// Thrown when <paramref name="type" /> cannot be converted to <see cref="TimeSpan" />.
/// </exception>
/// <inheritdoc />
public virtual BinarySerializerBuilderCaseResult BuildExpression(Expression value, Type type, Schema schema, BinarySerializerBuilderContext context)
{
if (schema.LogicalType is DurationLogicalType)
{
if (!(schema is FixedSchema fixedSchema && fixedSchema.Size == 12))
{
throw new UnsupportedSchemaException(schema);
}
Expression Write(Expression value)
{
var getBytes = typeof(BitConverter)
.GetMethod(nameof(BitConverter.GetBytes), new[] { value.Type });
Expression bytes = Expression.Call(null, getBytes, value);
if (!BitConverter.IsLittleEndian)
{
var buffer = Expression.Variable(bytes.Type);
var reverse = typeof(Array)
.GetMethod(nameof(Array.Reverse), new[] { bytes.Type });
bytes = Expression.Block(
new[] { buffer },
Expression.Assign(buffer, bytes),
Expression.Call(null, reverse, buffer),
buffer);
}
var writeFixed = typeof(BinaryWriter)
.GetMethod(nameof(BinaryWriter.WriteFixed), new[] { bytes.Type });
return(Expression.Call(context.Writer, writeFixed, bytes));
}
var totalDays = typeof(TimeSpan).GetProperty(nameof(TimeSpan.TotalDays));
var totalMs = typeof(TimeSpan).GetProperty(nameof(TimeSpan.TotalMilliseconds));
return(BinarySerializerBuilderCaseResult.FromExpression(
Expression.Block(
Write(Expression.Constant(0U)),
Write(
Expression.ConvertChecked(Expression.Property(value, totalDays), typeof(uint))),
Write(
Expression.ConvertChecked(
Expression.Subtract(
Expression.Convert(Expression.Property(value, totalMs), typeof(ulong)),
Expression.Multiply(
Expression.Convert(Expression.Property(value, totalDays), typeof(ulong)),
Expression.Constant(86400000UL))),
typeof(uint))))));
}
else
{
return(BinarySerializerBuilderCaseResult.FromException(new UnsupportedSchemaException(schema, $"{nameof(BinaryDurationSerializerBuilderCase)} can only be applied schemas with a {nameof(DurationLogicalType)}.")));
}
}
/// <summary>
/// Builds a <see cref="BinarySerializer{T}" /> for a <see cref="NullSchema" />.
/// </summary>
/// <returns>
/// A successful <see cref="BinarySerializerBuilderCaseResult" /> if <paramref name="schema" />
/// is a <see cref="NullSchema" />; an unsuccessful <see cref="BinarySerializerBuilderCaseResult" />
/// otherwise.
/// </returns>
/// <inheritdoc />
public virtual BinarySerializerBuilderCaseResult BuildExpression(Expression value, Type type, Schema schema, BinarySerializerBuilderContext context)
{
if (schema is NullSchema)
{
return(BinarySerializerBuilderCaseResult.FromExpression(Expression.Empty()));
}
else
{
return(BinarySerializerBuilderCaseResult.FromException(new UnsupportedSchemaException(schema, $"{nameof(BinaryNullSerializerBuilderCase)} can only be applied to {nameof(NullSchema)}s.")));
}
}
/// <summary>
/// Builds a <see cref="BinarySerializer{T}" /> for a <see cref="TimestampLogicalType" />.
/// </summary>
/// <returns>
/// A successful <see cref="BinarySerializerBuilderCaseResult" /> if <paramref name="schema" />
/// has a <see cref="TimestampLogicalType" />; an unsuccessful <see cref="BinarySerializerBuilderCaseResult" />
/// otherwise.
/// </returns>
/// <exception cref="UnsupportedSchemaException">
/// Thrown when <paramref name="schema" /> is not a <see cref="LongSchema" /> or when
/// <paramref name="schema" /> does not have a <see cref="MicrosecondTimestampLogicalType" />
/// or a <see cref="MillisecondTimestampLogicalType" />.
/// </exception>
/// <exception cref="UnsupportedTypeException">
/// Thrown when <paramref name="type" /> cannot be converted to <see cref="DateTimeOffset" />.
/// </exception>
/// <inheritdoc />
public virtual BinarySerializerBuilderCaseResult BuildExpression(Expression value, Type type, Schema schema, BinarySerializerBuilderContext context)
{
if (schema.LogicalType is TimestampLogicalType)
{
if (schema is not LongSchema)
{
throw new UnsupportedSchemaException(schema);
}
Expression expression;
try
{
expression = BuildConversion(value, typeof(DateTimeOffset));
}
catch (InvalidOperationException exception)
{
throw new UnsupportedTypeException(type, $"Failed to map {schema} to {type}.", exception);
}
var factor = schema.LogicalType switch
{
MicrosecondTimestampLogicalType => TimeSpan.TicksPerMillisecond / 1000,
MillisecondTimestampLogicalType => TimeSpan.TicksPerMillisecond,
_ => throw new UnsupportedSchemaException(schema, $"{schema.LogicalType} is not a supported {nameof(TimestampLogicalType)}."),
};
var utcTicks = typeof(DateTimeOffset)
.GetProperty(nameof(DateTimeOffset.UtcTicks));
var writeInteger = typeof(BinaryWriter)
.GetMethod(nameof(BinaryWriter.WriteInteger), new[] { typeof(long) });
// return writer.WriteInteger((value.UtcTicks - epoch) / factor);
return(BinarySerializerBuilderCaseResult.FromExpression(
Expression.Call(
context.Writer,
writeInteger,
Expression.Divide(
Expression.Subtract(
Expression.Property(expression, utcTicks),
Expression.Constant(Epoch.Ticks)),
Expression.Constant(factor)))));
}
else
{
return(BinarySerializerBuilderCaseResult.FromException(new UnsupportedSchemaException(schema, $"{nameof(BinaryTimestampSerializerBuilderCase)} can only be applied schemas with a {nameof(TimestampLogicalType)}.")));
}
}
/// <summary>
/// Builds a <see cref="BinarySerializer{T}" /> for a <see cref="StringSchema" />.
/// </summary>
/// <returns>
/// A successful <see cref="BinarySerializerBuilderCaseResult" /> if <paramref name="schema" />
/// is a <see cref="StringSchema" />; an unsuccessful <see cref="BinarySerializerBuilderCaseResult" />
/// otherwise.
/// </returns>
/// <exception cref="UnsupportedTypeException">
/// Thrown when <paramref name="type" /> cannot be converted to <see cref="string" />.
/// </exception>
/// <inheritdoc />
public virtual BinarySerializerBuilderCaseResult BuildExpression(Expression value, Type type, Schema schema, BinarySerializerBuilderContext context)
{
if (schema is StringSchema stringSchema)
{
var writeString = typeof(BinaryWriter)
.GetMethod(nameof(BinaryWriter.WriteString), new[] { typeof(string) });
try
{
return(BinarySerializerBuilderCaseResult.FromExpression(
Expression.Call(context.Writer, writeString, BuildConversion(value, typeof(string)))));
}
catch (InvalidOperationException exception)
{
throw new UnsupportedTypeException(type, $"Failed to map {stringSchema} to {type}.", exception);
}
}
else
{
return(BinarySerializerBuilderCaseResult.FromException(new UnsupportedSchemaException(schema, $"{nameof(BinaryStringSerializerBuilderCase)} can only be applied to {nameof(StringSchema)}s.")));
}
}
/// <summary>
/// Builds a <see cref="BinarySerializer{T}" /> for an <see cref="FixedSchema" />.
/// </summary>
/// <returns>
/// A successful <see cref="BinarySerializerBuilderCaseResult" /> <paramref name="schema" />
/// is a <see cref="FixedSchema" />; an unsuccessful <see cref="BinarySerializerBuilderCaseResult" />
/// otherwise.
/// </returns>
/// <exception cref="UnsupportedTypeException">
/// Thrown when <paramref name="type" /> cannot be converted to <see cref="T:System.Byte[]" />.
/// </exception>
/// <inheritdoc />
public virtual BinarySerializerBuilderCaseResult BuildExpression(Expression value, Type type, Schema schema, BinarySerializerBuilderContext context)
{
if (schema is FixedSchema fixedSchema)
{
Expression expression;
try
{
expression = BuildConversion(value, typeof(byte[]));
}
catch (InvalidOperationException exception)
{
throw new UnsupportedTypeException(type, $"Failed to map {fixedSchema} to {type}.", exception);
}
var bytes = Expression.Parameter(typeof(byte[]));
var exceptionConstructor = typeof(OverflowException)
.GetConstructor(new[] { typeof(string) });
var writeFixed = typeof(BinaryWriter)
.GetMethod(nameof(BinaryWriter.WriteFixed), new[] { typeof(byte[]) });
return(BinarySerializerBuilderCaseResult.FromExpression(
Expression.Block(
new[] { bytes },
Expression.Assign(bytes, expression),
Expression.IfThen(
Expression.NotEqual(Expression.ArrayLength(bytes), Expression.Constant(fixedSchema.Size)),
Expression.Throw(Expression.New(exceptionConstructor, Expression.Constant($"Only arrays of size {fixedSchema.Size} can be serialized to {fixedSchema}.")))),
Expression.Call(context.Writer, writeFixed, bytes))));
}
else
{
return(BinarySerializerBuilderCaseResult.FromException(new UnsupportedSchemaException(schema, $"{nameof(BinaryFixedSerializerBuilderCase)} can only be applied to {nameof(FixedSchema)}s.")));
}
}
/// <summary>
/// Builds a <see cref="BinarySerializer{T}" /> for an <see cref="MapSchema" />.
/// </summary>
/// <returns>
/// A successful <see cref="BinarySerializerBuilderCaseResult" /> if <paramref name="type" />
/// is a dictionary type and <paramref name="schema" /> is a <see cref="MapSchema" />; an
/// unsuccessful <see cref="BinarySerializerBuilderCaseResult" /> otherwise.
/// </returns>
/// <exception cref="UnsupportedTypeException">
/// Thrown when <paramref name="type" /> does not implement <see cref="T:System.Collections.Generic.IEnumerable{System.Collections.Generic.KeyValuePair`2}" />.
/// </exception>
/// <inheritdoc />
public virtual BinarySerializerBuilderCaseResult BuildExpression(Expression value, Type type, Schema schema, BinarySerializerBuilderContext context)
{
if (schema is MapSchema mapSchema)
{
var dictionaryTypes = GetDictionaryTypes(type);
if (dictionaryTypes is not null || type == typeof(object))
{
// support dynamic mapping:
var keyType = dictionaryTypes?.Key ?? typeof(object);
var valueType = dictionaryTypes?.Value ?? typeof(object);
var pairType = typeof(KeyValuePair <,>).MakeGenericType(keyType, valueType);
var collection = Expression.Variable(typeof(ICollection <>).MakeGenericType(pairType));
var enumerable = Expression.Variable(typeof(IEnumerable <>).MakeGenericType(pairType));
var enumerator = Expression.Variable(typeof(IEnumerator <>).MakeGenericType(pairType));
var loop = Expression.Label();
var getCount = collection.Type
.GetProperty("Count");
var getEnumerator = enumerable.Type
.GetMethod("GetEnumerator", Type.EmptyTypes);
var getCurrent = enumerator.Type
.GetProperty(nameof(IEnumerator.Current));
var getKey = pairType
.GetProperty("Key")
.GetGetMethod();
var getValue = pairType
.GetProperty("Value")
.GetGetMethod();
var moveNext = typeof(IEnumerator)
.GetMethod(nameof(IEnumerator.MoveNext), Type.EmptyTypes);
var writeInteger = typeof(BinaryWriter)
.GetMethod(nameof(BinaryWriter.WriteInteger), new[] { typeof(long) });
var writeKey = SerializerBuilder
.BuildExpression(Expression.Property(Expression.Property(enumerator, getCurrent), getKey), new StringSchema(), context);
var writeValue = SerializerBuilder
.BuildExpression(Expression.Property(Expression.Property(enumerator, getCurrent), getValue), mapSchema.Value, context);
var dispose = typeof(IDisposable)
.GetMethod(nameof(IDisposable.Dispose), Type.EmptyTypes);
Expression expression;
try
{
expression = BuildConversion(value, collection.Type);
}
catch (Exception exception)
{
throw new UnsupportedTypeException(type, $"Failed to map {mapSchema} to {type}.", exception);
}
// if (collection.Count > 0)
// {
// writer.WriteInteger((long)collection.Count);
//
// var enumerator = collection.GetEnumerator();
//
// try
// {
// // primitive foreach:
// loop: while (true)
// {
// if (enumerator.MoveNext())
// {
// ...
// }
// else
// {
// break loop;
// }
// }
// }
// finally
// {
// enumerator.Dispose();
// }
// }
//
// // write closing block:
// writer.WriteInteger(0L);
return(BinarySerializerBuilderCaseResult.FromExpression(
Expression.Block(
new[] { collection, enumerator },
Expression.Assign(collection, expression),
Expression.IfThen(
Expression.GreaterThan(
Expression.Property(collection, getCount),
Expression.Constant(0)),
Expression.Block(
Expression.Call(
context.Writer,
writeInteger,
Expression.Convert(
Expression.Property(collection, getCount),
typeof(long))),
Expression.Assign(
enumerator,
Expression.Call(collection, getEnumerator)),
Expression.TryFinally(
Expression.Loop(
Expression.IfThenElse(
Expression.Call(enumerator, moveNext),
Expression.Block(writeKey, writeValue),
Expression.Break(loop)),
loop),
Expression.Call(enumerator, dispose)))),
Expression.Call(
context.Writer,
writeInteger,
Expression.Constant(0L)))));
}
else
{
return(BinarySerializerBuilderCaseResult.FromException(new UnsupportedTypeException(type, $"{nameof(BinaryMapSerializerBuilderCase)} can only be applied to dictionary types.")));
}
}
/// <summary>
/// Builds a <see cref="BinarySerializer{T}" /> for a <see cref="UnionSchema" />.
/// </summary>
/// <returns>
/// A successful <see cref="BinarySerializerBuilderCaseResult" /> if <paramref name="schema" />
/// is a <see cref="UnionSchema" />; an unsuccessful <see cref="BinarySerializerBuilderCaseResult" />
/// otherwise.
/// </returns>
/// <exception cref="UnsupportedSchemaException">
/// Thrown when <paramref name="schema" /> has no <see cref="UnionSchema.Schemas" />.
/// </exception>
/// <exception cref="UnsupportedTypeException">
/// Thrown when <paramref name="type" /> cannot be mapped to at least one <see cref="Schema" />
/// in <paramref name="schema" />.
/// </exception>
/// <inheritdoc />
public virtual BinarySerializerBuilderCaseResult BuildExpression(Expression value, Type type, Schema schema, BinarySerializerBuilderContext context)
{
if (schema is UnionSchema unionSchema)
{
if (unionSchema.Schemas.Count < 1)
{
throw new UnsupportedSchemaException(schema, "A serializer cannot be built for an empty union.");
}
var schemas = unionSchema.Schemas.ToList();
var candidates = schemas.Where(s => s is not NullSchema).ToList();
var @null = schemas.Find(s => s is NullSchema);
var writeInteger = typeof(BinaryWriter)
.GetMethod(nameof(BinaryWriter.WriteInteger), new[] { typeof(long) });
Expression expression;
// if there are non-null schemas, select the first matching one for each possible type:
if (candidates.Count > 0)
{
var cases = new Dictionary <Type, Expression>();
var exceptions = new List <Exception>();
foreach (var candidate in candidates)
{
var selected = SelectType(type, candidate);
if (cases.ContainsKey(selected))
{
continue;
}
var underlying = Nullable.GetUnderlyingType(selected) ?? selected;
Expression body;
try
{
body = Expression.Block(
Expression.Call(
context.Writer,
writeInteger,
Expression.Constant((long)schemas.IndexOf(candidate))),
SerializerBuilder.BuildExpression(Expression.Convert(value, underlying), candidate, context));
}
catch (Exception exception)
{
exceptions.Add(exception);
continue;
}
if (@null != null && !(selected.IsValueType && Nullable.GetUnderlyingType(selected) == null))
{
body = Expression.IfThenElse(
Expression.Equal(value, Expression.Constant(null, selected)),
Expression.Call(
context.Writer,
writeInteger,
Expression.Constant((long)schemas.IndexOf(@null))),
body);
}
cases.Add(selected, body);
}
if (cases.Count == 0)
{
throw new UnsupportedTypeException(
type,
$"{type.Name} does not match any non-null members of {unionSchema}.",
new AggregateException(exceptions));
}
if (cases.Count == 1 && cases.First() is var first && first.Key == type)
{
expression = first.Value;
}
else
{
var exceptionConstructor = typeof(InvalidOperationException)
.GetConstructor(new[] { typeof(string) });
expression = Expression.Throw(Expression.New(
exceptionConstructor,
Expression.Constant($"Unexpected type encountered serializing to {type}.")));
foreach (var @case in cases)
{
expression = Expression.IfThenElse(
Expression.TypeIs(value, @case.Key),
@case.Value,
expression);
}
}
}
// otherwise, we know that the schema is just ["null"]:
else
{
expression = Expression.Call(
context.Writer,
writeInteger,
Expression.Constant((long)schemas.IndexOf(@null)));
}
return(BinarySerializerBuilderCaseResult.FromExpression(expression));
}
/// <summary>
/// Builds a <see cref="BinarySerializer{T}" /> for a <see cref="DecimalLogicalType" />.
/// </summary>
/// <returns>
/// A successful <see cref="BinarySerializerBuilderCaseResult" /> if <paramref name="schema" />
/// has a <see cref="DecimalLogicalType" />; an unsuccessful <see cref="BinarySerializerBuilderCaseResult" />
/// otherwise.
/// </returns>
/// <exception cref="UnsupportedSchemaException">
/// Thrown when <paramref name="schema" /> is not a <see cref="BytesSchema" /> or a
/// <see cref="FixedSchema "/>.
/// </exception>
/// <exception cref="UnsupportedTypeException">
/// Thrown when <paramref name="type" /> cannot be converted to <see cref="decimal" />.
/// </exception>
/// <inheritdoc />
public virtual BinarySerializerBuilderCaseResult BuildExpression(Expression value, Type type, Schema schema, BinarySerializerBuilderContext context)
{
if (schema.LogicalType is DecimalLogicalType decimalLogicalType)
{
var precision = decimalLogicalType.Precision;
var scale = decimalLogicalType.Scale;
Expression expression;
try
{
expression = BuildConversion(value, typeof(decimal));
}
catch (InvalidOperationException exception)
{
throw new UnsupportedTypeException(type, $"Failed to map {schema} to {type}.", exception);
}
// declare variables for in-place transformation:
var bytes = Expression.Variable(typeof(byte[]));
var integerConstructor = typeof(BigInteger)
.GetConstructor(new[] { typeof(decimal) });
var reverse = typeof(Array)
.GetMethod(nameof(Array.Reverse), new[] { typeof(Array) });
var toByteArray = typeof(BigInteger)
.GetMethod(nameof(BigInteger.ToByteArray), Type.EmptyTypes);
// var fraction = new BigInteger(...) * BigInteger.Pow(10, scale);
// var whole = new BigInteger((... % 1m) * (decimal)Math.Pow(10, scale));
// var bytes = (fraction + whole).ToByteArray();
//
// // BigInteger is little-endian, so reverse:
// Array.Reverse(bytes);
//
// return bytes;
expression = Expression.Block(
Expression.Assign(
bytes,
Expression.Call(
Expression.Add(
Expression.Multiply(
Expression.New(
integerConstructor,
expression),
Expression.Constant(BigInteger.Pow(10, scale))),
Expression.New(
integerConstructor,
Expression.Multiply(
Expression.Modulo(expression, Expression.Constant(1m)),
Expression.Constant((decimal)Math.Pow(10, scale))))),
toByteArray)),
Expression.Call(null, reverse, bytes),
bytes);
// figure out how to write:
if (schema is BytesSchema)
{
var writeBytes = typeof(BinaryWriter)
.GetMethod(nameof(BinaryWriter.WriteBytes), new[] { typeof(byte[]) });
expression = Expression.Block(
new[] { bytes },
expression,
Expression.Call(context.Writer, writeBytes, bytes));
}
else if (schema is FixedSchema fixedSchema)
{
var exceptionConstructor = typeof(OverflowException)
.GetConstructor(new[] { typeof(string) });
var writeFixed = typeof(BinaryWriter)
.GetMethod(nameof(BinaryWriter.WriteFixed), new[] { typeof(byte[]) });
expression = Expression.Block(
new[] { bytes },
expression,
Expression.IfThen(
Expression.NotEqual(Expression.ArrayLength(bytes), Expression.Constant(fixedSchema.Size)),
Expression.Throw(Expression.New(exceptionConstructor, Expression.Constant($"Size mismatch between {fixedSchema} (size {fixedSchema.Size}) and decimal with precision {precision} and scale {scale}.")))),
Expression.Call(context.Writer, writeFixed, bytes));
}
else
{
throw new UnsupportedSchemaException(schema);
}
return(BinarySerializerBuilderCaseResult.FromExpression(expression));
}
else
{
return(BinarySerializerBuilderCaseResult.FromException(new UnsupportedSchemaException(schema, $"{nameof(BinaryDecimalSerializerBuilderCase)} can only be applied schemas with a {nameof(DecimalLogicalType)}.")));
}
}