Replace multiple patterns in file using callbacks: Difference between revisions
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== Description == | == Description == | ||
There's other versions of find and replace that allow you to find and replace a single string in a file, but they don't deal with multiple replacements on a single line, or replacements of multiple patterns. I've written an alternative that reads and writes a file, calling a supplied function for every line, so you can make that function do the multiple replacements; thus doing all your replacements in a single pass. | There's other versions of find and replace that allow you to find and replace a single string in a file, but they don't deal with multiple replacements on a single line, or replacements of multiple patterns. I've written an alternative that reads and writes a file, calling a supplied function for every line, so you can make that function do the multiple replacements; thus doing all your replacements in a single pass. | ||
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[[ | [[Category:Text Files Manipulation Functions]] | ||
Revision as of 13:42, 24 June 2005
| Author: bazzargh (talk, contrib) |
Description
There's other versions of find and replace that allow you to find and replace a single string in a file, but they don't deal with multiple replacements on a single line, or replacements of multiple patterns. I've written an alternative that reads and writes a file, calling a supplied function for every line, so you can make that function do the multiple replacements; thus doing all your replacements in a single pass.
Its a little faster than doing multiple passes with AdvReplaceInFile, further improvements in find & replace for individual strings will make it faster still.
Example Usage
GetFunctionAddress $R0 ReplaceInSQL ; handle to callback fn Push $R0 Push "$INSTDIR\template.sql" ; file to replace in Call ReplaceInFile
Where ReplaceInSQL (or any function of your choosing) looks like:
Function ReplaceInSQL ; save R1 Push $R1 Exch ; A sequence of replacements. ; the string to replace in is at the top of the stack Push "@@foo@@" ; string to find Push "bar" ; string to replace it with Call StrRep ; see elsewhere in NSIS archive ; the string to replace in is at the top of the stack again Push "@@tellytubby@@" ; string to find Push "againagain" ; string to replace it with Call StrRep ; and so on ; restore stack Exch Pop $R1 FunctionEnd
The Function
Function ReplaceInFile Exch $R0 ;file name to search in Exch Exch $R4 ;callback function handle Push $R1 ;file handle Push $R2 ;temp file name Push $R3 ;temp file handle Push $R5 ;line read GetTempFileName $R2 FileOpen $R1 $R0 r ;file to search in FileOpen $R3 $R2 w ;temp file loop_read: ClearErrors FileRead $R1 $R5 ;read line Push $R5 ; put line on stack Call $R4 Pop $R5 ; read line from stack IfErrors exit FileWrite $R3 $R5 ;write modified line Goto loop_read exit: FileClose $R1 FileClose $R3 SetDetailsPrint none Delete $R0 Rename $R2 $R0 Delete $R2 SetDetailsPrint both ; pop in reverse order Pop $R5 Pop $R3 Pop $R2 Pop $R1 Pop $R4 Pop $R0 FunctionEnd
