doc/bugs/pagespec_parsing_chokes_on_function__40____41__.mdwn

   1 The pagespec regexes don't allow functions with no arguments.
   2
   3 IkiWiki.pm, around line 1035:
   4
   5 <pre>
   6 $spec=~m{
   7                 \s*             # ignore whitespace
   8                 (               # 1: match a single word
   9                         \!              # !
  10                 |
  11                         \(              # (
  12                 |
  13                         \)              # )
  14                 |
  15                         \w+\([^\)]+\)   # command(params)
  16                 |
  17                         [^\s()]+        # any other text
  18                 )
  19                 \s*             # ignore whitespace
  20         }igx
  21 </pre>
  22
  23 command(params) of course might be just command(). (See
  24 conditional.pm: match_included.) Trying to feed
  25 ikiwiki a pagespec without params will get you instead:
  26
  27 IkiWiki::PageSpec::match_glob($page, q{function}, @params) ( )
  28
  29 Which is completely not desired. The second + on that line should be a *.
  30
  31 None of the builtin pagespecs "work" with no parameters, so it's hard to
  32 write a unit test for this. But can we at least write a helpful note in
  33 case the user is given to rebuilding the wiki by hand. --Ethan
  34
  35 <pre>
  36 --- ikiwiki/IkiWiki.pm  2007-07-26 15:15:22.716860000 -0700
  37 +++ ikidev/IkiWiki.pm   2007-07-26 21:34:45.542248000 -0700
  38 @@ -1032,7 +1032,7 @@
  39                 |
  40                         \)              # )
  41                 |
  42 -                       \w+\([^\)]+\)   # command(params)
  43 +                       \w+\([^\)]*\)   # command(params)
  44                 |
  45                         [^\s()]+        # any other text
  46                 )
  47 @@ -1075,6 +1075,10 @@
  48         }
  49
  50         my $ret=eval pagespec_translate($spec);
  51 +       if ($@){
  52 +               my $t = pagespec_translate($spec);
  53 +               print "evaluating pagespec failed: $t $@\n";
  54 +       }
  55         return IkiWiki::FailReason->new("syntax error") if $@;
  56         return $ret;
  57  }
  58 </pre>
  59
  60 > Thanks, [[done]] --[[Joey]]
  61 >
  62 > Note that the printing of the error isn't needed though. pagespec_match()
  63 > returns an IkiWiki::FailReason object if parsing fails, and its caller
  64 > can use that as desired to print the error.