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File indexing completed on 2021-02-14 13:33:03

 #!/bin/env perl
 #
 # A script to parse cfi files for parameters to replace
 # Probably not very stable...
 #
 
 
 ### To turn on verbosity, uncomment following line
 #open(MSG,">&STDERR") or die "Couldn't open stderr: $!";
 
 use strict;
 
 # Extract source name from argument
 my $config = $ARGV[0];
 (my $source = $config) =~ s/.*(CMSSW)/$1/;
 
 
 # Alignment of comments: column number
 my $alignment = 60;
 
 print "# Generated from $source\n";
 print MSG "Parsing  $source\n";
 
 open(INPUT,$config) or die "Couldn't open $config: $!";
 my $levelName = ""; # Name of current block/module
 my $lineNb = 0;
 my $isMulti = 0;
 MAIN: while( <INPUT> ) {
   print MSG ++$lineNb."\n";
 
   # Skip empty lines
   next if (!/\S/);
 
   # Skip includes
   next if ( /\s*include\s+\".*\"/ );
 
   # Skip commented-out lines
   next if (m@^\s*(//|#)@);
 
   chomp();
   my $line = $_; # Store line
 
   while ( $line =~ /\S/ ) {
     # 1. Process named blocks (modules, blocks, PSets)
     ($line,$levelName) = &processBlocks( $line, $levelName );
 
     # 2. Skip VPSets and sequences
     #    NB. This is fragile!
     if ( $line =~ /(VPSet|sequence)\s+(\S+)\s*=\s*\{\s*/ ) {
       print MSG "Found $1 with name $2: skipping\n";
       my $nBraces = 1; # Start with one, from above matching
       $line = $';
       $nBraces += &countBraces( $line );
       print MSG "$nBraces: $line\n";
       if ( $nBraces>0 ){
         while ( <INPUT> ) {
           $line = $_;
           $nBraces += &countBraces( $line );
           print MSG "$nBraces: $line\n";
           last if ( $nBraces <= 0 );
         }
       }
       $line = "";
       next;       # This assumes closing brace is last on line...
     }
 
     # 3. Process parameters (might be multiline)
     ($line,$isMulti) = &processParameters( $line, $levelName );
     if ( $isMulti ) { # Treat mutliline separately...
       while (<INPUT>) {
         print MSG ++$lineNb."\n";
         s/^\s+//; # Remove leading spaces
         chomp();
         $_ = &nukeComments( $_ ); # Remove comments in that case
         if ( /.*?\}/ ) {
           print $line.$&."\n"; # Dump what we have found
           $line = $';     # Store remainder in line for future use
           $isMulti = 0;
           last;
         } else {
           $line .= $_;
         }
       }
       print MSG "End of span\n";
     }
 
     # 4. Remove remaining comments on blocks
     $line = &nukeComments( $line );
 
     # 5. Climb up levels if braces are closed
     ($line,$levelName) = &closeBraces( $line, $levelName );
   }
 }
 close(INPUT);
 
 
 #_______________________________________________________________________
 # Check line for new blocks and add them to level name
 sub processBlocks {
 
   my $line = shift;
   my $levelName = shift;
 
   if ( $line =~ /(module|block|[^V]PSet)\s+(\S+)\s*=\s*(\S+)?\s*\{\s*/ ) {
     print MSG "Found $1 with name $2".($3?" and label $3":"")."\n";
     $levelName .= (length($levelName)>0?'.':'').$2;
     $line = $';
   }
 
   return ($line,$levelName);
 }
 
 
 #_______________________________________________________________________
 # Check for new parameters
 sub processParameters{
 
   my $line = shift;
   my $levelName = shift;
   my $isMulti = 0;
 
   if ( $line =~ /([\w\d]+)\s+(\S+)\s*=\s*(.*)$/ ) {
     my $type = $1;
     my $name = $2;
     my $value = $3;
     $line = $';
 
     # Check for un-balanced closing brace and put back on line
     if ( $value !~ /\{/ && $value =~ /\}/ ) {
       $value = $`;
       $line = '}'.$line;
     }
 
     print MSG "Found $type with name $name and value $value";
     # Check if this parameter spans over several lines
     if ( $value =~ /\{/ && $value !~ /\}/ ) {
       $isMulti++;
       print MSG " spanning over multiple lines";
       $value = &nukeComments($value); # Don't keep comments in that case: too disturbing
     }
     print MSG "\n";
 
     # Dump out
     &dumpReplace($levelName,$name,$value);
     if ( !$isMulti ) { print "\n"; }
 
   }
 
 
   return $line,$isMulti;
 
 }
 
 #_______________________________________________________________________
 # Remove trailing comments from block definitions (can't carry them)
 sub nukeComments {
 
   my $line = shift;
 
   if ( $line =~ m@\s*(//|#)@ ) {
     $line = $`;
   }
   return $line;
 
 } 
 
 #______________________________________________________________________
 # Close braces and adjust levelName correspondingly
 sub closeBraces {
 
   my $line = shift;
   my $levelName = shift;
 
   if ( $line =~ /^\s*\}\s*/ ) {
     my $curLevel = $levelName;
     print MSG "Found closing brace - climbing up: '$levelName' -> ";
     $levelName =~ s/\.[^\.]*?$//;
     if ( $curLevel =~ /^$levelName$/ ) { # Treat special case...
       $levelName = "";
     }
     $line = $';
     print MSG "'$levelName'\n";
   }
   return ($line,$levelName);
 
 }
 
 #______________________________________________________________________
 # Count number of braces
 # Opening adds one, closing removes one
 sub countBraces {
 
   my $string = shift;
   my $nBraces = 0;
   my $char = "";
 
   while ( length($string)>0 ) {
     $char = chop($string);
     ++$nBraces if ( $char =~ /\{/ );
     --$nBraces if ( $char =~ /\}/ );
   }
 
   return $nBraces;
 
 }
 
 
 #______________________________________________________________________
 # Subroutine to nicely dump the replace statements
 # Tries to align comments
 sub dumpReplace {
   my $prefix = shift; # Level name
   my $name   = shift; # Parameter name
   my $string = shift; # Value, including possible comment
 
   if ( $string =~ /(#|\/\/)\s*/ ) {
     my $value = $`;
     my $comment = $';
     $value =~ s/\s+$//g; # Remove trailing spaces
     # Alignment: add necessary spaces
     while ( length($prefix.$name." = ".$value) < $alignment ) { $value .= " "; }
     $string = $value." # ".$comment;
   }
   print "replace $prefix.$name = $string";
 }

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