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Token Routine - sBefore

Token Routine - sBefore

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'
' Parameters
'
'   sAllTokens                 (I) Required. The string containing all the tokens
'   iToken                      (I) Optional. The index of the token to use as a "before" ref
'                                   DEFAULT = 2
'   siDelim                     (I) Optional. The delimiter string that separates
'                                   the tokens. DEFAULT = " " (Space)
' Description
'  For the following:
'    sAllTokens         iToken   sDelim  Returns           Notes
'   "William M Rawls"    1       " "     ""                 Before the first word (nothing)
'   "William M Rawls"    2       " "     "William"          Before the second word
'   "William M Rawls"    3       " "     "William M"        Before the third word
'   "William M Rawls"    0       " "     ""                 Before zeroth token (nothing)
'   "William M Rawls"   -1       " "     ""                 Negative tokens act same as zero
'   "William M Rawls"    1       ""      ""                 Same as one
' ********************************************************************************Public Function sBefore(ByVal sAllTokens As String, Optional ByVal iToken As Integer = 2, Optional ByVal sDelim As String = " ") As String
    Static iCurTokenLocation As Long ' Character position of the first delimiter string
    Static nDelim As Integer            ' Length of the delimiter string
    Static sReturned As String

    nDelim = Len(sDelim)
    If iToken < 2 Or nDelim < 1 Then
     ' First, Zeroth, or Negative tokens or empty delimiter strings mean an empty string returned
       sBefore = ""
       Exit Function
    ElseIf iToken = 2 Then
     ' Quickly extract the first token
       sBefore = sGetToken(sAllTokens, 1, sDelim)
       Exit Function
    Else
     ' Find the Nth token
       Do
          iCurTokenLocation = InStr(sAllTokens, sDelim)
          If iCurTokenLocation = 0 Or iToken = 1 Then
             sBefore = sReturned
             sReturned = ""
             Exit Function
          ElseIf Len(sReturned) = 0 Then
             sReturned = Left(sAllTokens, iCurTokenLocation - 1)
          Else
             sReturned = sReturned & sDelim & Left(sAllTokens, iCurTokenLocation - 1)
          End If
          sAllTokens = Mid(sAllTokens, iCurTokenLocation + nDelim)
          iToken = iToken - 1
       Loop
    End If
End Function