Challenge 259 late solution by Packy Anderson

    * Perl - Task 2

1 files changed, 71 insertions, 0 deletions

diff --git a/challenge-259/packy-anderson/perl/ch-2.pl b/challenge-259/packy-anderson/perl/ch-2.pl
new file mode 100755
index 0000000000..5be4e1fb4e
--- /dev/null
+++ b/challenge-259/packy-anderson/perl/ch-2.pl
@@ -0,0 +1,71 @@
+#!/usr/bin/env perl
+use v5.38;
+
+my $ID     = qr/ (?<ID> \w+) /x;
+my $FIELD  = qr/ (?<FIELD> \w+) /x;
+my $NUMBER = qr/ (?<NUMBER> \d+ [ \. \d+ ]? ) /x;
+my $STRING = qr/ (?<STRING> ([^"] | \\ | \\\" )+ ) /x;
+
+my $QUOTED_STRING = qr/ (?<QUOTED_STRING> " $STRING " ) /x;
+my $FIELD_VALUE = qr/ $FIELD \s* = \s* ( $NUMBER | $QUOTED_STRING ) \s* /x;
+my $FIELD_VALUES = qr/ (?<FIELD_VALUES> (?: $FIELD_VALUE \s* )* ) /x;
+
+# negative lookbehind and negative lookahead
+my $TEXT = qr/ (?<TEXT> (?<! {% ) .+ (?! %} ) ) /x;
+my $LINE = qr/ (?<LINE> \{% \s* $ID \s* $FIELD_VALUES \s* %\} ) /x;
+
+my $TOP  = qr/^ (?: $LINE | $TEXT ) $/x;
+
+my $file = shift @ARGV;
+open my $fh, '<', $file;
+
+my %data;
+my @ids;
+my $in_id;
+
+while (my $line = <$fh>) {
+  say 'L: ' . $line;
+  $line =~ /$TOP/;
+
+  # is there a line with {% ... %} ?
+  if ($+{LINE}) {
+    my $id = $+{ID};
+    # is the id the end of a block?
+    if ($id =~ /^ end(\w+) $/x) { # capture after end
+      if (exists $data{$1}) { # it is!
+        $id = $1; 
+        undef $in_id; # clear the id we're processing
+        if ($data{$id}{'text'}) {
+          # if there's text, remove the final "newline"
+          $data{$id}{'text'} =~ s/\\n$//;
+        }
+        next; # skip to next line of file
+      }
+    }
+    push @ids, $id; # keep list of ids in order
+    $in_id = $id; # keep track of the current id for text
+    # initialize base data for this id
+    $data{$id} = { name => $id };
+    # if we have fields...
+    my $field_values = $+{FIELD_VALUES};
+    # loop over field values and store them in the data
+    while ($field_values =~ /$FIELD_VALUE/g) {
+      my $value = $+{STRING} ? $+{STRING} : $+{NUMBER};
+      if ($+{NUMBER}) {
+        $value =~ s/\s+$//; # we're picking up trailing spaces
+      }
+      $data{$id}->{'fields'}->{ $+{FIELD} } = $value;
+    }
+
+  }
+  # if we have non-{% ... %} lines and we have an ID
+  elsif ($+{TEXT} && $in_id) {
+    # append a "newline" to the end
+    $data{$in_id}{'text'} .= $+{TEXT} . "\\n";
+  }
+}
+
+use Data::Dumper::Concise;
+foreach my $id (@ids) {
+  print Dumper($data{$id});
+}