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Re: Parsing a macro language

by TedPride (Priest)
on Jul 09, 2005 at 06:44 UTC ( #473647=note: print w/replies, xml ) Need Help??

in reply to Parsing a macro language

It's much easier to parse a structure if you mark the end types as well as the start. You could do something like the following:
use strict; use warnings; use Data::Dumper; my $structure = main(join '',<DATA>); print Dumper($structure); sub main { my ($s, $c, %hash) = $_[0]; while ($s =~ /START PAGE(?: (\w+))?\s+(.*?)\s+END PAGE/gs) { $hash{$1 ? $1 : ++$c} = page($2); } return \%hash; } sub page { my ($s, $c, %hash) = $_[0]; while ($s =~ /START QUESTION(?: (\w+))?\s+(.*?)\s+END QUESTION/gs) + { $hash{$1 ? $1 : ++$c} = question($2); } return \%hash; } sub question { my ($s, %hash) = $_[0]; ($hash{'label'}) = $s =~ /LABEL (.*)/; $s =~ /START CHOICES\s+(.*?)\s+END CHOICES/s; for (split / *\n */, $1) { push @{$hash{'choices'}}, [split / /, $_, 2]; } return \%hash; } __DATA__ START PAGE p1 START QUESTION 4B LABEL Do you like your pie with ice cream? START CHOICES 1 Yes 2 No END CHOICES END QUESTION START QUESTION 4C LABEL Do you like your pie with whipped cream? START CHOICES 1 Yes 2 No END CHOICES END QUESTION END PAGE
I've made the choices into arrays instead of hashes, to preserve order.

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