Or, for a hash-based represenation that's closer to what you originally asked for:
sub parse_brackets {
my @parse;
my @stack = \@parse;
my $fewer_indents = 1; # Try setting this to 0 or 1
my $line_no;
foreach my $line ( @_ ) {
$line_no ++;
$line =~ s/\A\s+//;
$line =~ s/\s+\Z//;
if ( $line !~ /\S/ ) {
next;
} elsif ( $line =~ s/\s*\{$// ) {
my @line = split ' ', $line;
my %node = ( type => shift(@line), ( @line ? ( name => shift(@li
+ne) ) : () ) );
push @{ $stack[0] }, \%node;
unshift @stack, do { $node{contents} = [] };
} elsif ( $line eq '}' ) {
shift @stack;
scalar @stack or die("Too many right brackets at line $line_no")
+;
} else {
push @{ $stack[0] }, $line;
}
}
scalar @stack == 1 or die("Too few right brackets at line $line_no")
+;
return @parse;
}
Output:
$VAR1 = {
'contents' => [
{
'contents' => [
{
'contents' => [
'Do you
+like your pie with ice cream?'
],
'type' => 'label'
},
{
'contents' => [
'1 Yes',
'2 No'
],
'type' => 'single'
}
],
'name' => '4B',
'type' => 'question'
},
{
'contents' => [
{
'contents' => [
'Do you
+like your pie with whipped cream?'
],
'type' => 'label'
},
{
'contents' => [
'1 Yes',
'2 No'
],
'type' => 'single'
}
],
'name' => '4C',
'type' => 'question'
}
],
'name' => 'p1',
'type' => 'page'
};
Oh, and for future reference, I don't think I would call this a "macro language". It's a data markup format, with no functional or substitutional behavior.