Greetings and Salutations Perl Monks,

My objective is to wrap a SPICE statement string that is greater than 79 characters onto multiple lines. The lines following the first line must be preceeded with a continuation character, a plus (+) sign. For readability purposes the line should be broken on word boundries (whitespace).

I previously found an answer to my question on this site two years ago (for a slightly different problem). I found when I needed to expand this solution to pre-fix the continued lines with a "+"-sign it failed. I'm not sure why it is failing. Here is a snippet of the code. The original code was contributed by Anonymous Monk & Poznick. 

$spice_str = "VIN IN VSS PWL ( 0ns 0.0 4ns 2.4 25ns 0.0 50ns 2.4 51ns 
+0.0 75ns 2.4 76ns 0.0 100ns 2.4 101ns 0.0 )";

$rest = $spice_str;
@text = ();

while ( $rest ne '' ) {
    $rest =~ /(.{1,25}[^a-zA-Z0-9.])/ms;
    push @text, $1;
    $rest = $';
}

foreach ( @text ) {
    print "$_\n";
}

[download]
Works, but if I change it slightly: 
$rest = "+ " . $';

[download]
It appears to hang, like awaiting input. I realize that I could alter the final print foreach statement to fix this issue, but I wanted to understand what's going on. And, of course, I would like to make this as elegant (and readable by my customer) as possible.

An unworthy Physicist posing as a Perl programmer,

gcmandrake

In reply to Splitting SPICE lines on 'word' boundries closest to a certain length by gcmandrake

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