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POCleanest Perl parser for Makefile-like continuation lines
 

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    <p>A perl script I'm writing needs to parse a file that has continuation lines like a Makefile. i.e. lines that begin with whitespace are part of the previous line.</p> <p>I wrote the code below but don't feel like it is very clean or perl-ish (heck, it doesn't even use "redo"!)</p> <p>There are many edge cases: EOF at odd places, single-line files, files that start or end with a blank line (or non-blank line, or continuation line), empty files. All my test cases (and code) are here: <a href="http://whatexit.org/tal/flatten.tar" rel="nofollow noreferrer">http://whatexit.org/tal/flatten.tar</a></p> <p>Can you write cleaner, perl-ish, code that passes all my tests?</p> <pre><code>#!/usr/bin/perl -w use strict; sub process_file_with_continuations { my $processref = shift @_; my $nextline; my $line = &lt;ARGV&gt;; $line = '' unless defined $line; chomp $line; while (defined($nextline = &lt;ARGV&gt;)) { chomp $nextline; next if $nextline =~ /^\s*#/; # skip comments $nextline =~ s/\s+$//g; # remove trailing whitespace if (eof()) { # Handle EOF $nextline =~ s/^\s+/ /; if ($nextline =~ /^\s+/) { # indented line &amp;$processref($line . $nextline); } else { &amp;$processref($line); &amp;$processref($nextline) if $nextline ne ''; } $line = ''; } elsif ($nextline eq '') { # blank line &amp;$processref($line); $line = ''; } elsif ($nextline =~ /^\s+/) { # indented line $nextline =~ s/^\s+/ /; $line .= $nextline; } else { # non-indented line &amp;$processref($line) unless $line eq ''; $line = $nextline; } } &amp;$processref($line) unless $line eq ''; } sub process_one_line { my $line = shift @_; print "$line\n"; } process_file_with_continuations \&amp;process_one_line; </code></pre>
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