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#Region "Microsoft.VisualBasic::27a6e726bdd07af572a40c4625b66bd9, Microsoft.VisualBasic.Core\Extensions\Collection\Linq\Iterator.vb"
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#End Region
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Imports System.Runtime.CompilerServices
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Imports Microsoft.VisualBasic.ComponentModel
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Imports Microsoft.VisualBasic.Emit.Marshal
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Imports Microsoft.VisualBasic.Language
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Imports Microsoft.VisualBasic.Language.Default
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Imports Microsoft.VisualBasic.Serialization.JSON
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Namespace Linq
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Public Module IteratorExtensions
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<Extension>
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Public Iterator Function SeqIterator(source As IEnumerable, Optional offset% = 0) As IEnumerable(Of SeqValue(Of Object))
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Dim i As Integer = offset
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For Each o As Object In source
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Yield New SeqValue(Of Object)(i, o)
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i += 1
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Next
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End Function
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<Extension>
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Public Iterator Function SeqIterator(Of T)(source As IEnumerable(Of T), Optional offset% = 0) As IEnumerable(Of SeqValue(Of T))
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If Not source Is Nothing Then
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Dim idx% = offset
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For Each x As T In source
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Yield New SeqValue(Of T)(idx, x)
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idx += 1
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Next
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End If
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function SeqTuple(Of T1, T2)(tuple As (a As IEnumerable(Of T1), b As IEnumerable(Of T2)), Optional offset% = 0) As IEnumerable(Of SeqValue(Of (a As T1, b As T2)))
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Return (tuple.a.ToArray, tuple.b.ToArray).SeqTuple(offset)
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End Function
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<Extension>
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Public Iterator Function SeqTuple(Of T1, T2)(tuple As (x As T1(), y As T2()), Optional offset% = 0) As IEnumerable(Of SeqValue(Of (a As T1, b As T2)))
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Dim value As (T1, T2)
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Dim length% = Math.Max(tuple.x.Length, tuple.y.Length)
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For i As Integer = 0 To length - 1
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value = (
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tuple.x.ElementAtOrDefault(i),
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tuple.y.ElementAtOrDefault(i)
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)
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Yield New SeqValue(Of (T1, T2))(i + offset, value)
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Next
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End Function
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<Extension>
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Public Function [Next](Of T)(source As IEnumerator(Of T)) As T
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If source.MoveNext() Then
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Return source.Current
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Else
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Return Nothing
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End If
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End Function
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<Extension>
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Public Function Previous(Of T)(source As IEnumerator(Of T)) As T
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Throw New NotImplementedException
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function ValueArray(Of T)(source As IEnumerable(Of Value(Of T).IValueOf)) As T()
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Return source.Select(Function(o) o.Value).ToArray
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function Indices(Of T)(source As IEnumerable(Of SeqValue(Of T))) As Integer()
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Return source.Ordinals.ToArray
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function Ordinals(Of T)(source As IEnumerable(Of SeqValue(Of T))) As IEnumerable(Of Integer)
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Return source.Select(Function(o) o.i)
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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<Extension>
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Public Function Indices(Of T)(source As IEnumerable(Of T), assert As Func(Of T, Boolean)) As Integer()
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Return source _
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.SeqIterator _
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.Where(Function(x) True = assert(x.value)) _
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.Indices
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End Function
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End Module
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Value <typeparamref name="T"/> with sequence index <see cref="i"/>.
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Public Structure SeqValue(Of T) : Implements IAddressOf
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Implements IComparable(Of Integer)
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Implements IComparable
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Implements Value(Of T).IValueOf
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Implements IsEmpty
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The position of this object value in the original sequence.
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Public Property i As Integer Implements IAddressOf.Address
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The Object data
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Public Property value As T Implements Value(Of T).IValueOf.Value
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Public ReadOnly Property IsEmpty As Boolean Implements IsEmpty.IsEmpty
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Get
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Return i = 0 AndAlso value Is Nothing
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End Get
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End Property
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Sub New(i%, x As T)
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Me.i = i
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value = x
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End Sub
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Public Overrides Function ToString() As String
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Return Me.value.GetJson(False)
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End Function
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Public Shared Narrowing Operator CType(x As SeqValue(Of T)) As T
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Return x.value
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End Operator
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Public Shared Narrowing Operator CType(x As SeqValue(Of T)) As Integer
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Return x.i
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End Operator
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Public Shared Operator +(list As System.Collections.Generic.List(Of T), x As SeqValue(Of T)) As System.Collections.Generic.List(Of T)
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Call list.Add(x.value)
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Return list
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End Operator
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Public Shared Operator Mod(i As SeqValue(Of T), n%) As Integer
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Return i.i Mod n
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End Operator
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Public Shared Operator <>(v As SeqValue(Of T), i%) As Boolean
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Return v.i <> i
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End Operator
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Public Shared Operator =(v As SeqValue(Of T), i%) As Boolean
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Return v.i = i
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End Operator
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Get value from <see cref="value"/> property.
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<param name="x"></param>
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<remarks>
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Syntax helper for the <see cref="Pointer(Of T)"/>:
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```vbnet
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Dim p As Pointer(Of T) = T()
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Dim x As T = ++p
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```
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</remarks>
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Public Shared Operator +(x As SeqValue(Of T)) As T
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Return x.value
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End Operator
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Get value from <see cref="value"/> property.
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<param name="x"></param>
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<remarks>
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Syntax helper for the <see cref="Pointer(Of T)"/>:
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```vbnet
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Dim p As Pointer(Of T) = T()
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Dim x As T = --p
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```
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</remarks>
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Public Shared Operator -(x As SeqValue(Of T)) As T
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Return x.value
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End Operator
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Compares the index value <see cref="i"/>.
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<param name="other"></param>
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<MethodImpl(MethodImplOptions.AggressiveInlining)>
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Public Function CompareTo(other As Integer) As Integer Implements IComparable(Of Integer).CompareTo
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Return i.CompareTo(other)
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End Function
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Public Function CompareTo(obj As Object) As Integer Implements IComparable.CompareTo
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If obj Is Nothing Then
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Return 1
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End If
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If Not obj.GetType Is Me.GetType Then
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Return 10
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End If
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Return i.CompareTo(DirectCast(obj, SeqValue(Of T)).i)
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End Function
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Private Sub Assign(address As Integer) Implements IAddress(Of Integer).Assign
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i = address
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End Sub
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End Structure
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Exposes the enumerator, which supports a simple iteration over a collection of
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a specified type.To browse the .NET Framework source code for this type, see
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the Reference Source.
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(使用这个的原因是系统自带的<see cref="IEnumerable(Of T)"/>在Xml序列化之中的支持不太好)
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<typeparam name="T">The type of objects to enumerate.This type parameter is covariant. That is, you
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can use either the type you specified or any type that is more derived. For more
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information about covariance and contravariance, see Covariance and Contravariance
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in Generics.</typeparam>
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Public Interface IIterator(Of T)
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Returns an enumerator that iterates through the collection.
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<returns>An enumerator that can be used to iterate through the collection.</returns>
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Function GetEnumerator() As IEnumerator(Of T)
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Returns an enumerator that iterates through a collection.
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<returns>An System.Collections.IEnumerator object that can be used to iterate through
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the collection.</returns>
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Function IGetEnumerator() As IEnumerator
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End Interface
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End Namespace
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