arrays - 跳过数组中的一行，Perl

Question

我对 Perl 比较陌生，我遇到过这个项目，但我遇到了一些困难。该项目的目标是比较两个 csv 文件，其中之一包含:$名称、$型号、$版本另一个包含:$name2,$磁盘,$存储最后，RESULT 文件将包含匹配的行并将信息组合在一起，如下所示:$名称、$模型、$版本、$磁盘、$存储。

我已经成功做到了这一点，但我的问题是，当缺少其中一个元素时，程序就会中断。当它在文件中遇到缺少元素的行时，它会在该行停止。我该如何解决这个问题？有什么建议或方法可以让它跳过该行并继续吗？

这是我的代码:

open( TESTING, '>testing.csv' ); # Names will be printed to this during testing. only .net       ending names should appear
open( MISSING, '>Missing.csv' ); # Lines with missing name feilds will appear here.

#open (FILE,'C:\Users\hp-laptop\Desktop\file.txt');
#my (@array) =<FILE>;
my @hostname;    #stores names

#close FILE;
#***** TESTING TO SEE IF ANY OF THE LISTED ITEMS BEGIN WITH A COMMA AND DO NOT HAVE A   NAME.
#***** THESE OBJECTS ARE PLACED INTO THE MISSING ARRAY AND THEN PRINTED OUT IN A SEPERATE
#***** FILE.
#open (FILE,'C:\Users\hp-laptop\Desktop\file.txt');
#test
if ( open( FILE, "file.txt" ) ) {

}
else {
  die " Cannot open file 1!\n:$!";

}

$count = 0;
$x     = 0;
while (<FILE>) {

  ( $name, $model, $version ) = split(",");    #parsing

  #print $name;
  chomp( $name, $model, $version );

  if ( ( $name =~ /^\s*$/ )
      && ( $model   =~ /^\s*$/ )
      && ( $version =~ /^\s*$/ ) )    #if all of the fields  are blank ( just a blank space)
  {

    #do nothing at all
  }
  elsif ( $name =~ /^\s*$/ ) {   #if name is a blank
    $name =~ s/^\s*/missing/g;
    print MISSING "$name,$model,$version\n";

    #$hostname[$count]=$name;
    #$count++;
  }
  elsif ( $model =~ /^\s*$/ ) {   #if model is blank
    $model =~ s/^\s*/missing/g;
    print MISSING"$name,$model,$version\n";
  }
  elsif ( $version =~ /^\s*$/ ) {   #if version is blank
    $version =~ s/^\s*/missing/g;
    print MISSING "$name,$model,$version\n";
  }

  # Searches for .net to appear in field "$name" if match, it places it into hostname array.
  if ( $name =~ /.net/ ) {

    $hostname[$count] = $name;
    $count++;
  }

#searches for a comma in the name feild, puts that into an array and prints the line into the missing file.
#probably won't have to use this, as I've found a better method to test all of the    feilds ( $name,$model,$version)
#and put those into the missing file. Hopefully it works.
#foreach $line (@array)
#{
#if($line =~ /^\,+/)
#{
#$line =~s/^\,*/missing,/g;
#$missing[$x]=$line;
#$x++;
#}
#}

}
close FILE;

for my $hostname (@hostname) {
  print TESTING $hostname . "\n";
}

#for my $missing(@missing)
#{
# print MISSING $missing;
#}
if ( open( FILE2, "file2.txt" ) ) {    #Run this if the open succeeds

  #open outfile and print starting header
  open( RESULT, '>resultfile.csv' );
  print RESULT ("name,Model,version,Disk, storage\n");
}
else {
  die " Cannot open file 2!\n:$!";
}
$count = 0;
while ( $hostname[$count] ne "" ) {
  while (<FILE>) {
    ( $name, $model, $version ) = split(",");    #parsing

    #print $name,"\n";

    if ( $name eq $hostname[$count] )    # I think this is the problem area.
    {
      print $name, "\n", $hostname[$count], "\n";

      #print RESULT"$name,$model,$version,";
      #open (FILE2,'C:\Users\hp-laptop\Desktop\file2.txt');
      #test
      if ( open( FILE2, "file2.txt" ) ) {

      }
      else {
        die " Cannot open file 2!\n:$!";

      }

      while (<FILE2>) {
        chomp;
        ( $name2, $Dcount, $vname ) = split(",");    #parsing

        if ( $name eq $name2 ) {
          chomp($version);
          print RESULT"$name,$model,$version,$Dcount,$vname\n";

        }

      }

    }

    $count++;
  }

  #open (FILE,'C:\Users\hp-laptop\Desktop\file.txt');
  #test
  if ( open( FILE, "file.txt" ) ) {

  }
  else {
    die " Cannot open file 1!\n:$!";

  }

}

close FILE;
close RESULT;
close FILE2;

Answer 1

我想你想要next ，它可以让您立即完成当前迭代并开始下一个迭代:

while (<FILE>) {
  ( $name, $model, $version ) = split(",");
  next unless( $name && $model && $version );
  ...;
  }

您使用的条件取决于您接受的值。在我的示例中，我假设所有值都需要为 true。如果它们不需要是空字符串，也许您可​​以检查长度:

while (<FILE>) {
  ( $name, $model, $version ) = split(",");
  next unless( length($name) && length($model) && length($version) );
  ...;
  }

如果您知道如何验证每个字段，则可能有这些字段的子例程:

while (<FILE>) {
  ( $name, $model, $version ) = split(",");
  next unless( length($name) && is_valid_model($model) && length($version) );
  ...;
  }

sub is_valid_model { ... }

现在您只需要决定如何将其整合到您已经在做的事情中。