Add script to unroll C++11 range based for loops

Author: mgreter

script/replace-range-for-loops.pl

@@ -0,0 +1,57 @@
+# this script may be used to replace `for(auto : xyz)` loops
+# with a more std compliant form that also compiles on gcc 4.4
+# albeit completely unsupported by libsass, you may use it
+# if there is no way to upgrade your local compiler. Mileage
+# may vary, and I want to stress again that this is unsupported.
+
+use strict;
+use warnings;
+
+use File::Slurp;
+use File::Basename;
+use File::Spec::Functions;
+
+warn "YOU ARE ENTERING UNSUPPORTED LAND !!!!\n";
+warn "DON'T POST BUGS WHEN USING GCC 4.4 !!!!\n";
+
+my $root = $ENV{'SASS_LIBSASS_PATH'} || catfile(dirname($0), '..');
+
+sub process($)
+{
+
+	my $count = 0;
+	my ($file) = @_;
+
+	my $cpp = read_file($file, { binmode => ':raw' });
+
+	my $org = $cpp;
+
+	my $re_decl = qr/(?:const\s*)?\w+(?:\:\:\w+)*(?:\s*[\*\&])?/;
+	my $re_val = qr/\w+(?:\(\))?(?:(?:->|\.)\w+(?:\(\))?)*/;
+
+	$cpp =~ s/for\s*\(\s*($re_decl)\s*(\w+)\s*:\s*(\(\*?$re_val\)|\*?$re_val)\s*\)\s*{/
+		$count ++;
+		"for (auto __$2 = $3.begin(); __$2 != $3.end(); ++__$2) { $1 $2 = *(__$2);";
+	/gex;
+
+	return if $org eq $cpp || $count == 0;
+
+	warn sprintf "made %02d replacements in %s\n", $count, $file;
+
+	write_file($file, { binmode => ':raw' }, $cpp);
+
+}
+
+sub processdir($)
+{
+	my $rv = opendir(my $dh, $_[0]);
+	die "not found ", $_[0] unless $rv;
+	while (my $entry = readdir($dh)) {
+		next if $entry eq "." || $entry eq "..";
+		next unless $entry =~ m/\.[hc]pp$/;
+		if (-d $_[0]) { process(catfile($_[0], $entry)); }
+		elsif (-f $_[0]) { process(catfile($_[0], $entry)); }
+	}
+}
+
+processdir catfile($root, "src");