xt/author/show-template-structure.pl

   1 #!/usr/bin/perl
   2
   3 # Copyright (C) 2010 Galen Charlton
   4 #
   5 # This file is part of Koha.
   6 #
   7 # Koha is free software; you can redistribute it and/or modify it
   8 # under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # Koha is distributed in the hope that it will be useful, but
  13 # WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with Koha; if not, see <http://www.gnu.org/licenses>.
  19
  20 use Modern::Perl;
  21
  22 =head1 NAME
  23
  24 show-template-structure.pl
  25
  26 =head1 DESCRIPTION
  27
  28 This script displays the structure of loops and conditional statements
  29 in an L<HTML::Template::Pro> template, and is an aid for debugging errors
  30 reported by the xt/author/valid-templates.t test.  It also identifies
  31 the following errors:
  32
  33 =over 2
  34
  35 =item * TMPL_IF/TMPL_UNLESS/TMPL_LOOP with no closing tag
  36
  37 =item * TMPL_ELSE with no initial TMPL_IF or TMPL_UNLESS
  38
  39 =item * extra closing tags
  40
  41 =item * HTML comment of the form <!-- TMPL_FOO ..., where TMPL_FOO is not a valid L<HTML::Template::Pro> tag
  42
  43 =back
  44
  45 =head2 USAGE
  46
  47 =over 4
  48
  49 xt/author/show-template-structure.pl path/to/template.tt
  50
  51 =back
  52
  53 Output is sent to STDOUT.
  54
  55 =cut
  56
  57 scalar(@ARGV) == 1 or die "Usage: $0 template-file\n";
  58 my $file = $ARGV[0];
  59 open IN, $file or die "Failed to open template file $file: $!\n";
  60
  61 my %valid_tmpl_tags = (
  62     tmpl_var     => 1,
  63     tmpl_if      => 1,
  64     tmpl_unless  => 1,
  65     tmpl_else    => 1,
  66     tmpl_elsif   => 1,
  67     tmpl_include => 1,
  68     tmpl_loop    => 1,
  69 );
  70
  71 my %tmpl_structure_tags = (
  72     tmpl_if     => 1,    # hash value controls whether to push/pop from the tag stack
  73     tmpl_else   => 0,
  74     tmpl_elsif  => 0,
  75     tmpl_unless => 1,
  76     tmpl_loop   => 1,
  77 );
  78
  79 my $lineno = 0;
  80
  81 my @tag_stack = ();
  82
  83 sub emit {
  84
  85     # print message with indentation
  86     my $level = scalar(@tag_stack);
  87     print "  " x ( $level - 1 ), shift;
  88 }
  89
  90 while (<IN>) {
  91     $lineno++;
  92
  93     # look for TMPL_IF, TMPL_ELSE, TMPL_UNLESS, and TMPL_LOOPs in HTML comments
  94     # this makes the assumption that these control statements are never
  95     # spread across multiple lines
  96     foreach my $comment (/<!-- (.*?) -->/g) {
  97
  98         my $norm_comment = lc $comment;
  99         $norm_comment =~ s/^\s+//;
 100         next unless $norm_comment =~ m!^/{0,1}tmpl_!;
 101         my ( $tmpl_tag_close, $tmpl_tag ) = $norm_comment =~ m!^(/{0,1})(tmpl_\S+)!;
 102         $tmpl_tag_close = "" unless defined $tmpl_tag_close;
 103
 104         unless ( exists $valid_tmpl_tags{$tmpl_tag} ) {
 105             print "ERROR (line $lineno): $tmpl_tag is not a valid HTML::Template::Pro tag\n";
 106         }
 107         next unless exists $tmpl_structure_tags{$tmpl_tag};    # only care about tags that affect loop or conditional structure
 108         if ( $tmpl_structure_tags{$tmpl_tag} ) {
 109
 110             # we'll either be pushing or popping the tag stack
 111             if ($tmpl_tag_close) {
 112
 113                 # popping tag
 114                 emit "${tmpl_tag_close}${tmpl_tag} (line $lineno)";
 115                 if ( scalar(@tag_stack) < 1 ) {
 116                     print "\nERROR (line $lineno): $tmpl_tag causes tag stack underflow\n";
 117                 } else {
 118                     my ( $popped_tag, $target, $popped_lineno ) = @{ pop @tag_stack };
 119                     if ( $tmpl_tag ne $popped_tag ) {
 120                         print "\nERROR (line $lineno): got /$tmpl_tag but expected /$popped_tag to",
 121                               " match $popped_tag from line $popped_lineno\n";
 122                     } else {
 123                         print " # $target from $popped_lineno\n";
 124                     }
 125                 }
 126             } elsif ( $tmpl_structure_tags{$tmpl_tag} ) {
 127
 128                 # pushable tag
 129                 my ($target) = $comment =~ /(?:EXPR|NAME)\s*=\s*['"](.*?)['"]/i;
 130                 push @tag_stack, [ $tmpl_tag, $target, $lineno ];
 131                 emit "${tmpl_tag_close}${tmpl_tag} ($target, line $lineno)\n";
 132             }
 133         } else {
 134
 135             # we're either a tmpl_else or tmpl_elsif, so make sure that
 136             # top of stack contains a tmpl_if
 137             emit "${tmpl_tag_close}${tmpl_tag} (line $lineno)\n";
 138             if ( scalar @tag_stack < 1 ) {
 139                 print "ERROR: found $tmpl_tag, but tag stack is empty.\n";
 140             } else {
 141                 my ( $peeked_tag, $target, $peeked_lineno ) = @{ $tag_stack[0] };
 142                 if ( $peeked_tag ne "tmpl_if" and $peeked_tag ne "tmpl_unless" ) {
 143                     print "ERROR: found $tmpl_tag, but it does not appear to match a tmpl_if.  Top of stack is $peeked_tag.\n";
 144                 }
 145             }
 146         }
 147     }
 148 }
 149
 150 close IN;
 151
 152 # anything left in the stack?
 153 if (scalar @tag_stack > 0) {
 154     print "ERROR: tag stack is not empty - the following template structures have not been closed:\n";
 155     my $i = 0;
 156     while (my $entry = pop @tag_stack) {
 157         $i++;
 158         my ( $popped_tag, $target, $popped_lineno ) = @{ $entry };
 159         print "$i: $popped_tag $target (line $popped_lineno)\n";
 160     }
 161 }
 162
 163 exit 0;
 164
 165 =head1 AUTHOR
 166
 167 Koha Development Team <http://koha-community.org/>
 168
 169 Galen Charlton <gmcharlt@gmail.com>
 170
 171 =cut