[CMake] Regex changes between cmake 2.0.6 and 2.4.2 ??

[Kris Dekeyser]

Hi Brad,

I'm pretty sure something changed in the the interpretation of variables. I attached a simple CMakeLists.txt file that shows the difference along with a configuration file to read in.

In Cmake 2.0.6 it runs fine. In Cmake 2.4.2 it fails when reading the configuration file. The backslashes in the last line need to be escaped. Also, in the first line the ${...} string is not replace with the variable's contents. That's what causes the test to fail.

Note that the CMakeLists.txt program copies each word in ${line} into a WordList variable. It's pretty useless in the test program, but in our configuration it actually filters out some important keywords. If I skip that step in the test program, the test fails with Cmake 2.0.6, so I asume that the variable interpretation was done in that step in the older Cmake.

Is there a way in Cmake 2.0.4 to force the interpretation of variables in strings?

- Kris.

> -----Original Message-----
> From: Brad King [mailto:brad.king at kitware.com] 
> Sent: vrijdag 30 juni 2006 19:25
> To: Kris Dekeyser
> Cc: 'cmake at cmake.org'
> Subject: Re: [CMake] Regex changes between cmake 2.0.6 and 2.4.2 ??
> 
> 
> I just ran your example with 2.4.2 and got the latter output.
> 
> -Brad
> 
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PROJECT(TEST)

MACRO(PRINT_MESSAGE DebugLevel Message)
  MESSAGE(STATUS "${Message}")
ENDMACRO(PRINT_MESSAGE)    

SET(RegexBlanks "[ \t]+")
SET(RegexLeadingEndingBlanks "(^${RegexBlanks}|${RegexBlanks}$)")
SET(RegexEmpty "^[ \t]*$")
SET(RegexEmptyOrComment "^[ \t]*$|^#")
SET(RegexAbsoluteDir "^([a-zA-Z][:])?[/\\\\]")

#--- Make directories absolute
SET(DirList)

#--- Read configfile
FILE(READ ${PROJECT_SOURCE_DIR}/config.txt ConfigFileContents)
PRINT_MESSAGE(9 "Config file contents: ${ConfigFileContents}")

#--- Remove newlines
STRING(REGEX REPLACE "\n" ";" ConfigLines ${ConfigFileContents})
PRINT_MESSAGE(9 "Config file contents (changed): ${ConfigLines}")

SET(DirList)

FOREACH(ConfigLine ${ConfigLines})
  PRINT_MESSAGE(9 "Configuration line: ${ConfigLine}")

  #--- skip empty lines
  IF(NOT ${ConfigLine} MATCHES "${RegexEmptyOrComment}")

    SET(WordList)

    #--- remove leading and trainling blanks
    STRING(REGEX REPLACE ${RegexLeadingEndingBlanks} "" line ${ConfigLine})

    #--- replace remaining blanks with semicolon
    STRING(REGEX REPLACE ${RegexBlanks} ";" line ${line})
  
    FOREACH(word ${line})
      SET(WordList ${WordList} ${word})
    ENDFOREACH(word ${line})
    
    PRINT_MESSAGE(9 "WordList ${WordList}")
    
    FOREACH(word ${WordList})
    
      PRINT_MESSAGE(9 "word ${word}")
      
      IF(${word} MATCHES ${RegexAbsoluteDir})
      
        PRINT_MESSAGE(9 "word ${word} matches ${RegexAbsoluteDir}")
        
        SET(DirList ${DirList} ${word})
        
      ELSE(${word} MATCHES ${RegexAbsoluteDir})
      
        PRINT_MESSAGE(9 "word ${word} does not match ${RegexAbsoluteDir}")
        
        SET(DirList ${DirList} "/MYROOT/${word}")
        
      ENDIF(${word} MATCHES ${RegexAbsoluteDir})
      
      PRINT_MESSAGE(9 "DirList ${DirList}")
      
    ENDFOREACH(word ${WordList})

  ENDIF(NOT ${ConfigLine} MATCHES "${RegexEmptyOrComment}")
  
ENDFOREACH(ConfigLine ${ConfigLines})

PRINT_MESSAGE(9 "Final DirList ${DirList}")
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${PROJECT_SOURCE_DIR}/dir/dir
subdir/dir/dir
d:\root\dir