StrStrAdv

From NSIS Wiki

Author: deguix (talk, contrib)


Description

Requires: LogicLib header file and System plug-in.

Version: 2.0.

This function searches for a substring on a string in a specified search direction and number of loops. This function also supports case-sensitivity of searches.

How To Use

Syntax

${StrStrAdv} "ResultVar" "String" "SubString" "SearchDirection" \
             "StrInclusionDirection" "IncludeSubString" "Loops" \
             "CaseSensitive"

or

Push "String"
Push "SubString"
Push "SearchDirection"
Push "StrInclusionDirection"
Push "IncludeSubString"
Push "Loops"
Push "CaseSensitive"
Call StrStrAdv
Pop "ResultVar"

Parameters

ResultVar
Variable where the part of the String specified is returned. If SubString is not found, then an empty string will be returned. If SubString is empty, then String will be returned, along with the error flag. If String is empty, then an empty string will be returned, along with the error flag.
String
String where to search for SubString.
SubString
String to search in String.
SearchDirection
Specifies the direction of the search to go towards. ">" = right, "<" = left. Default is ">" (right).
StrInclusionDirection
Specifies which part of the string should be returned to "ResultVar" relating to the position of the SubString found in String. ">" = right, "<" = left. Default is ">" (right).
IncludeSubString
Specifies if SubString should be included in the string returned by the ResultVar parameter. "1" = true, "0" = false. Default is "1" (True).
Loops
Specifies the number of times the code will search "SubString" in "String" not including the original code execution itself. Default is "0" (1 code execution).
CaseSensitive
Specifies if the search should be case-sensitive or not. "1" = true, "0" = false. Default is "0" (case-insensitive).

Example

${StrStrAdv} $0 "This is just an example" " is" ">" "<" "0" "0" "0"
;$0 = "This"

Function Code

!define StrStrAdv "!insertmacro StrStrAdv"
 
!macro StrStrAdv ResultVar String SubString SearchDirection \
       StrInclusionDirection IncludeSubString Loops CaseSensitive
  Push `${String}`
  Push `${SubString}`
  Push `${SearchDirection}`
  Push `${StrInclusionDirection}`
  Push `${IncludeSubString}`
  Push `${Loops}`
  Push `${CaseSensitive}`
  Call StrStrAdv
  Pop `${ResultVar}`
!macroend
 
Function StrStrAdv
/*After this point:
  ------------------------------------------
  $0 = String (input)
  $1 = SubString (input)
  $2 = SearchDirection (input)
  $3 = StrInclusionDirection (input)
  $4 = IncludeSubString (input)
  $5 = Loops (input)
  $6 = CaseSensitive (input)
  $7 = StringLength (temp)
  $8 = StrToSearchLength (temp)
  $9 = CurrentLoop (temp)
  $R0 = EndCharPos (temp)
  $R1 = StartCharPos (temp)
  $R2 = ResultVar (output)
  $R3 = Temp (temp)*/
 
  ;Get input from user
 
  Exch $6
  Exch
  Exch $5
  Exch
  Exch 2
  Exch $4
  Exch 2
  Exch 3
  Exch $3
  Exch 3
  Exch 4
  Exch $2
  Exch 4
  Exch 5
  Exch $1
  Exch 5
  Exch 6
  Exch $0
  Exch 6
  Push $7
  Push $8
  Push $9
  Push $R3
  Push $R2
  Push $R1
  Push $R0
 
  ; Clean $R0-$R3 variables
  StrCpy $R0 ""
  StrCpy $R1 ""
  StrCpy $R2 ""
  StrCpy $R3 ""
 
  ; Verify if we have the correct values on the variables
  ${If} $0 == ``
    SetErrors ;AdvStrStr_StrToSearch not found
    Goto AdvStrStr_End
  ${EndIf}
 
  ${If} $1 == ``
    SetErrors ;No text to search
    Goto AdvStrStr_End
  ${EndIf}
 
  ${If} $2 != <
    StrCpy $2 >
  ${EndIf}
 
  ${If} $3 != <
    StrCpy $3 >
  ${EndIf}
 
  ${If} $4 <> 0
    StrCpy $4 1
  ${EndIf}
 
  ${If} $5 <= 0
    StrCpy $5 0
  ${EndIf}
 
  ${If} $6 <> 1
    StrCpy $6 0
  ${EndIf}
 
  ; Find "AdvStrStr_String" length
  StrLen $7 $0
 
  ; Then find "AdvStrStr_SubString" length
  StrLen $8 $1
 
  ; Now set up basic variables
 
  ${If} $2 == <
    IntOp $R1 $7 - $8
    StrCpy $R2 $7
  ${Else}
    StrCpy $R1 0
    StrCpy $R2 $8
  ${EndIf}
 
  StrCpy $9 0 ; First loop
 
  ;Let's begin the search
 
  ${Do}
    ; Step 1: If the starting or ending numbers are negative
    ;         or more than AdvStrStr_StringLen, we return
    ;         error
 
    ${If} $R1 < 0
      StrCpy $R1 ``
      StrCpy $R2 ``
      StrCpy $R3 ``
      SetErrors ;AdvStrStr_SubString not found
      Goto AdvStrStr_End
    ${ElseIf} $R2 > $7
      StrCpy $R1 ``
      StrCpy $R2 ``
      StrCpy $R3 ``
      SetErrors ;AdvStrStr_SubString not found
      Goto AdvStrStr_End
    ${EndIf}
 
    ; Step 2: Start the search depending on
    ;         AdvStrStr_SearchDirection. Chop down not needed
    ;         characters.
 
    ${If} $R1 <> 0
      StrCpy $R3 $0 `` $R1
    ${EndIf}
 
    ${If} $R2 <> $7
      ${If} $R1 = 0
        StrCpy $R3 $0 $8
      ${Else}
        StrCpy $R3 $R3 $8
      ${EndIf}
    ${EndIf}
 
    ; Step 3: Make sure that's the string we want
 
    ; Case-Sensitive Support <- Use "AdvStrStr_Temp"
    ; variable because it won't be used anymore
 
    ${If} $6 == 1
      System::Call `kernel32::lstrcmpA(ts, ts) i.s` `$R3` `$1`
      Pop $R3
      ${If} $R3 = 0
        StrCpy $R3 1 ; Continue
      ${Else}
        StrCpy $R3 0 ; Break
      ${EndIf}
    ${Else}
      ${If} $R3 == $1
        StrCpy $R3 1 ; Continue
      ${Else}
        StrCpy $R3 0 ; Break
      ${EndIf}
    ${EndIf}
 
    ; After the comparasion, confirm that it is the
    ; value we want.
 
    ${If} $R3 = 1
 
      ;We found it, return except if the user has set up to
      ;search for another one:
      ${If} $9 >= $5
 
        ;Now, let's see if the user wants
        ;AdvStrStr_SubString to appear:
        ${If} $4 == 0
          ;Return depends on AdvStrStr_StrInclusionDirection
          ${If} $3 == <
            ; RTL
            StrCpy $R0 $0 $R1
          ${Else}
            ; LTR
            StrCpy $R0 $0 `` $R2
          ${EndIf}
          ${Break}
        ${Else}
          ;Return depends on AdvStrStr_StrInclusionDirection
          ${If} $3 == <
            ; RTL
            StrCpy $R0 $0 $R2
          ${Else}
            ; LTR
            StrCpy $R0 $0 `` $R1
          ${EndIf}
          ${Break}
        ${EndIf}
      ${Else}
        ;If the user wants to have more loops, let's do it so!
        IntOp $9 $9 + 1
 
        ${If} $2 == <
          IntOp $R1 $R1 - 1
          IntOp $R2 $R2 - 1
        ${Else}
          IntOp $R1 $R1 + 1
          IntOp $R2 $R2 + 1
        ${EndIf}
      ${EndIf}
    ${Else}
      ; Step 4: We didn't find it, so do steps 1 thru 3 again
 
      ${If} $2 == <
        IntOp $R1 $R1 - 1
        IntOp $R2 $R2 - 1
      ${Else}
        IntOp $R1 $R1 + 1
        IntOp $R2 $R2 + 1
      ${EndIf}
    ${EndIf}
  ${Loop}
 
  AdvStrStr_End:
 
  ;Add 1 to AdvStrStr_EndCharPos to be supportable
  ;by "StrCpy"
 
  IntOp $R2 $R2 - 1
 
  ;Return output to user
 
  Exch $R0
  Exch
  Pop $R1
  Exch
  Pop $R2
  Exch
  Pop $R3
  Exch
  Pop $9
  Exch
  Pop $8
  Exch
  Pop $7
  Exch
  Pop $6
  Exch
  Pop $5
  Exch
  Pop $4
  Exch
  Pop $3
  Exch
  Pop $2
  Exch
  Pop $1
  Exch
  Pop $0
 
FunctionEnd

Credits

Author: Diego Pedroso (deguix)
Based on StrStr function.

Personal tools
donate
ads