Friend Class [Text]
' Methods
Public Shared Sub Register(ByVal ce As CalcEngine)
ce.RegisterFunction("CHAR", 1, New CalcEngineFunction(AddressOf Text._Char))
ce.RegisterFunction("CODE", 1, New CalcEngineFunction(AddressOf Text.Code))
ce.RegisterFunction("CONCATENATE", 1, &H7FFFFFFF, New CalcEngineFunction(AddressOf Text.Concat))
ce.RegisterFunction("FIND", 2, 3, New CalcEngineFunction(AddressOf Text.Find))
ce.RegisterFunction("LEFT", 1, 2, New CalcEngineFunction(AddressOf Text.Left))
ce.RegisterFunction("LEN", 1, New CalcEngineFunction(AddressOf Text.Len))
ce.RegisterFunction("LOWER", 1, New CalcEngineFunction(AddressOf Text.Lower))
ce.RegisterFunction("MID", 3, New CalcEngineFunction(AddressOf Text.Mid))
ce.RegisterFunction("PROPER", 1, New CalcEngineFunction(AddressOf Text.Proper))
ce.RegisterFunction("REPLACE", 4, New CalcEngineFunction(AddressOf Text.Replace))
ce.RegisterFunction("REPT", 2, New CalcEngineFunction(AddressOf Text.Rept))
ce.RegisterFunction("RIGHT", 1, 2, New CalcEngineFunction(AddressOf Text.Right))
ce.RegisterFunction("SEARCH", 2, New CalcEngineFunction(AddressOf Text.Search))
ce.RegisterFunction("SUBSTITUTE", 3, 4, New CalcEngineFunction(AddressOf Text.Substitute))
ce.RegisterFunction("T", 1, New CalcEngineFunction(AddressOf Text.T))
ce.RegisterFunction("TEXT", 2, New CalcEngineFunction(AddressOf Text._Text))
ce.RegisterFunction("TRIM", 1, New CalcEngineFunction(AddressOf Text.Trim))
ce.RegisterFunction("UPPER", 1, New CalcEngineFunction(AddressOf Text.Upper))
ce.RegisterFunction("VALUE", 1, New CalcEngineFunction(AddressOf Text.Value))
End Sub
Private Shared Function _Char(ByVal p As List(Of Expression)) As Object
Dim c As Char = Microsoft.VisualBasic.ChrW(CInt(p.Item(0)))
Return c.ToString
End Function
Private Shared Function _Text(ByVal p As List(Of Expression)) As Object
Dim dbl As Double = CDbl(p.Item(0))
Return dbl.ToString(p.Item(1), System.Globalization.CultureInfo.InvariantCulture)
End Function
Private Shared Function Code(ByVal p As List(Of Expression)) As Object
Dim s As String = CStr(p.Item(0))
Return Microsoft.VisualBasic.Val(s.Chars(0))
End Function
Private Shared Function Concat(ByVal p As List(Of Expression)) As Object
Dim sb As New System.Text.StringBuilder
Dim x As Expression
For Each x In p
sb.Append(CStr(x))
Next
Return sb.ToString
End Function
Private Shared Function Find(ByVal p As List(Of Expression)) As Object
Return Text.IndexOf(p, StringComparison.Ordinal)
End Function
Private Shared Function IndexOf(ByVal p As List(Of Expression), ByVal cmp As StringComparison) As Integer
Dim srch As String = p.Item(0)
Dim text As String = p.Item(1)
Dim start As Integer = 0
If (p.Count > 2) Then
start = (CInt(p.Item(2)) - 1)
End If
Dim index As Integer = [text].IndexOf(srch, start, cmp)
Return IIf((index > -1), (index + 1), index)
End Function
Private Shared Function Left(ByVal p As List(Of Expression)) As Object
Dim n As Integer = 1
If (p.Count > 1) Then
n = CInt(p.Item(1))
End If
Return CStr(p.Item(0)).Substring(0, n)
End Function
Private Shared Function Len(ByVal p As List(Of Expression)) As Object
Return CStr(p.Item(0)).Length
End Function
Private Shared Function Lower(ByVal p As List(Of Expression)) As Object
Return CStr(p.Item(0)).ToLower
End Function
Private Shared Function Mid(ByVal p As List(Of Expression)) As Object
Return CStr(p.Item(0)).Substring((CInt(p.Item(1)) - 1), CInt(p.Item(2)))
End Function
Private Shared Function Proper(ByVal p As List(Of Expression)) As Object
Dim s As String = p.Item(0)
Return (s.Substring(0, 1).ToUpper & s.Substring(1).ToLower)
End Function
Private Shared Function Replace(ByVal p As List(Of Expression)) As Object
Dim s As String = p.Item(0)
Dim start As Integer = (CInt(p.Item(1)) - 1)
Dim len As Integer = CInt(p.Item(2))
Dim rep As String = p.Item(3)
Dim sb As New System.Text.StringBuilder
sb.Append(s.Substring(0, start))
sb.Append(rep)
sb.Append(s.Substring((start + len)))
Return sb.ToString
End Function
Private Shared Function Rept(ByVal p As List(Of Expression)) As Object
Dim sb As New System.Text.StringBuilder
Dim s As String = p.Item(0)
Dim i As Integer
For i = 0 To CInt(p.Item(1)) - 1
sb.Append(s)
Next i
Return sb.ToString
End Function
Private Shared Function Right(ByVal p As List(Of Expression)) As Object
Dim n As Integer = 1
If (p.Count > 1) Then
n = CInt(p.Item(1))
End If
Dim s As String = p.Item(0)
Return s.Substring((s.Length - n))
End Function
Private Shared Function Search(ByVal p As List(Of Expression)) As Object
Return Text.IndexOf(p, StringComparison.OrdinalIgnoreCase)
End Function
Private Shared Function Substitute(ByVal p As List(Of Expression)) As Object
Dim text As String = p.Item(0)
Dim oldText As String = p.Item(1)
Dim newText As String = p.Item(2)
If (p.Count = 3) Then
Return [text].Replace(oldText, newText)
End If
Dim index As Integer = CInt(p.Item(3))
If (index < 1) Then
Throw New Exception("Invalid index in Substitute.")
End If
Dim pos As Integer = [text].IndexOf(oldText)
Do While ((pos > -1) AndAlso (index > 1))
pos = [text].IndexOf(oldText, CInt((pos + 1)))
index -= 1
Loop
Return IIf((pos > -1), ([text].Substring(0, pos) & newText & [text].Substring((pos + oldText.Length))), [text])
End Function
Private Shared Function T(ByVal p As List(Of Expression)) As Object
Return CStr(p.Item(0))
End Function
Private Shared Function Trim(ByVal p As List(Of Expression)) As Object
Return CStr(p.Item(0)).Trim
End Function
Private Shared Function Upper(ByVal p As List(Of Expression)) As Object
Return CStr(p.Item(0)).ToUpper
End Function
Private Shared Function Value(ByVal p As List(Of Expression)) As Object
Return Double.Parse(p.Item(0), System.Globalization.NumberStyles.Any, System.Globalization.CultureInfo.InvariantCulture)
End Function
End Class
Submit an article or tip