CSV Parsing Module using OOP

[Gary]

Testing OOP in a CSV parsing Module

Uses "console"


'testing oop to create a CSV parsing module




Type ParseCsv
Private
  mainstring as string
  Delimiter As String  
  posString as long
  


Public  
Function _Create(ByVal txt_in As String) As Long
    '---------------------------------------------------
      me.mainstring=txt_in
      me.Delimiter=","
      
    End Function


Function Chg_ParseCVS(ByVal txt_in As String)
    '---------------------------------------------------
      me.mainstring=txt_in
      
    End Function


Function ParseInsert (index As Long ) As String
  'add delimiter position inside string ParseInsert("aa,bb,cc", "," ,2) would give aa,,bb,cc
  
  
  
  if (index > 0)  then 
    if (index > parsecount(me.mainstring,me.delimiter) + 1) Then
      function =me.mainstring
      exit function
    end if 
    index= index -1
    if index = 0 then 
      function = me.delimiter + me.mainstring
      exit function 
    end if  
    
    me.posString = instr(1,me.mainstring, me.delimiter,index)
  
    if me.posString=0 Then
      me.mainString = me.mainString+me.delimiter
      '? me.mainString
    else 
      me.mainString=mid$(me.mainstring,1,me.posString-1) + me.delimiter +  mid$(me.mainstring,me.posString )   
      '? me.mainString
      
    end if
  Else
    me.mainstring 
    '? ? me.mainString
    exit Function
  end if     
  
   
End Function


Function ParseDelete(index AS Long) AS String
         'deletes a indexed position inside string
    dim Cnt  AS Long
    dim cntMinusDelimiter as long
    Local Txt AS String
    If Len(me.MainString) = 0 Then
        exit function
        'Function = me.MainString  
    Else
        Cnt = instr(1,me.MainString,me.delimiter,index)
        Txt = Parse$(me.MainString, me.delimiter, index)
        cntMinusDelimiter=cnt-len(txt)-1
        if cnt=0 then
           me.MainString =mid$(me.MainString,1,cntMinusDelimiter)
        else   
          me.MainString =mid$(me.MainString,1,cntMinusDelimiter) + mid$(me.MainString,Cnt+len(me.delimiter)) 
        end if
    End If




End Function


Function ParseReplace( ByVal iPos AS Long, ByVal sNewString AS String) AS String
'from William Burns


   Local iCount   AS Long
   Local sTextOut AS String
   If Len(me.mainstring) = 0 Then
      Function = me.mainstring  'just return same string on errors
   Else
      For iCount = 1 To ParseCount(me.mainstring, me.delimiter)
         If iCount = iPos Then   'is this the one we want to switch?
            sTextOut = sTextOut + sNewString + me.delimiter
         Else
            sTextOut = sTextOut + Parse$(me.mainstring, me.delimiter, iCount) + me.delimiter
         End If
      Next iCount
      me.mainstring = Left$(sTextOut,Len(sTextOut)-Len(me.delimiter))  'remove traling delimiter
   End If
End Function






function PrintOut()
    '---------------------------------------------------
      PrintL " mainstring :", Me.mainstring
      
End function


function ToVariable()as string
    '---------------------------------------------------
      function = Me.mainstring
      
End function


function parseNew(index as long) as string
   function = Parse$(me.mainstring,me.delimiter,index)
end function




function parseCnt() as long
  function = parsecount(me.mainstring,me.delimiter)


end function
end type


dim main as string
Dim c1 As ParseCsv("aa,bb,cc")  'CSV string (comma delimited)


c1.ParseInsert(2)   'insert delimiter into aa,bb,cc like aa,,bb,cc
c1.PrintOut()


c1.ParseReplace(2,"dfa")  'puts dfa into aa,,bb,cc like aa,dfa,bb,cc
c1.PrintOut()


c1.ParseDelete(2)        'deletes the second delimited field
c1.PrintOut()


main = c1.ToVariable()   'retrieves mainstring and puts in variable


Printl "main variable:", main


'can not use parse$ reserve word as function name
printl "ParseNew: " + c1.ParseNew(3)  ' the parse$ statement


printl "ParseCnt: " + str$(c1.parseCnt()) 'the parsecount statement


c1.Chg_ParseCVS("1,2,3")
c1.PrintOut()


Console_WaitKey

[ErosOlmi]

Thanks a lot for this example!
Considering the very basic thinBasic OOP programming ... is a great example of OOP encapsulation

[Caindaf]

How effective has the CSV parsing module using OOP been in your testing, and have you encountered any specific challenges or limitations while implementing it?