StrRep

Author: deguix (talk, contrib)

Description

Requires: LogicLib.

Version: 2.0.1.

This function searches and replaces all occurrences of a substring in a string.

How To Use

Syntax

${StrRep} "ResultVar" "String" "SubString" "RepString"

or

Push "String"
Push "SubString"
Push "RepString"
Call StrRep
Pop "ResultVar"

Parameters

ResultVar

Variable where resulting operation of the replacement is returned. If SubString is not found, the value is the same as String.

String

String where to search for SubString.

SubString

String to search in String and to be replaced by RepString.

RepString

String to replace all occurances of SubString inside String.

Example

${StrRep} $0 "This is just an example" "just" ""
;$0 = "This is an example"

Function Code

!define StrRep "!insertmacro StrRep"
 
!macro StrRep ResultVar String SubString RepString
  Push "${String}"
  Push "${SubString}"
  Push "${RepString}"
  Call StrRep
  Pop "${ResultVar}"
!macroend
 
Function StrRep
/*After this point:
  ------------------------------------------
  $R0 = RepString (input)
  $R1 = SubString (input)
  $R2 = String (input)
  $R3 = RepStrLen (temp)
  $R4 = SubStrLen (temp)
  $R5 = StrLen (temp)
  $R6 = StartCharPos (temp)
  $R7 = TempStrL (temp)
  $R8 = TempStrR (temp)*/
 
  ;Get input from user
  Exch $R0
  Exch
  Exch $R1
  Exch
  Exch 2
  Exch $R2
  Push $R3
  Push $R4
  Push $R5
  Push $R6
  Push $R7
  Push $R8
 
  ;Return "String" if "SubString" is ""
  ${IfThen} $R1 == "" ${|} Goto Done ${|}
 
  ;Get "RepString", "String" and "SubString" length
  StrLen $R3 $R0
  StrLen $R4 $R1
  StrLen $R5 $R2
  ;Start "StartCharPos" counter
  StrCpy $R6 0
 
  ;Loop until "SubString" is found or "String" reaches its end
  ${Do}
    ;Remove everything before and after the searched part ("TempStrL")
    StrCpy $R7 $R2 $R4 $R6
 
    ;Compare "TempStrL" with "SubString"
    ${If} $R7 == $R1
      ;Split "String" to replace the string wanted
      StrCpy $R7 $R2 $R6 ;TempStrL
 
      ;Calc: "StartCharPos" + "SubStrLen" = EndCharPos
      IntOp $R8 $R6 + $R4
 
      StrCpy $R8 $R2 "" $R8 ;TempStrR
 
      ;Insert the new string between the two separated parts of "String"
      StrCpy $R2 $R7$R0$R8
      ;Now calculate the new "StrLen" and "StartCharPos"
      StrLen $R5 $R2
      IntOp $R6 $R6 + $R3
      ${Continue}
    ${EndIf}
 
    ;If not "SubString", this could be "String" end
    ${IfThen} $R6 >= $R5 ${|} ${ExitDo} ${|}
    ;If not, continue the loop
    IntOp $R6 $R6 + 1
  ${Loop}
 
  Done:
 
  ;Return output to user
  StrCpy $R0 $R2
 
/*After this point:
  ------------------------------------------
  $R0 = ResultVar (output)*/
 
  Pop $R8
  Pop $R7
  Pop $R6
  Pop $R5
  Pop $R4
  Pop $R3
  Pop $R2
  Pop $R1
  Exch $R0
FunctionEnd

Versions History

2.0.1

Fixed stack problems.

Credits

Version 2.x - Diego Pedroso (deguix).
Version 1.x - Hendri Adriaens (Smile2Me) / Afrow UK / Diego Pedroso (deguix).