response to response

[git.ikiwiki.info.git] / doc / todo / pagespec_relative_to_a_target.mdwn

diff --git a/doc/todo/pagespec_relative_to_a_target.mdwn b/doc/todo/pagespec_relative_to_a_target.mdwn
index b04b51fd126ff3d3a8a32a2450cd869ec0c892ca..00030cce61093192797a46a545389c324cf46078 100644 (file)
--- a/doc/todo/pagespec_relative_to_a_target.mdwn
+++ b/doc/todo/pagespec_relative_to_a_target.mdwn
@@ -57,7 +57,7 @@ diff -urNX ignorepats ikiwiki/IkiWiki/Plugin/relative.pm ikidev/IkiWiki/Plugin/r
 +
 +package IkiWiki::PageSpec;
 +
 +
 +package IkiWiki::PageSpec;
 +

-+sub match_relative($$;@) { #{{{
++sub match_relative($$;@) {

 +      my $parent = shift;
 +      my $spec = shift;
 +      my %params = @_;
 +      my $parent = shift;
 +      my $spec = shift;
 +      my %params = @_;


@@ -69,27 +69,33 @@ diff -urNX ignorepats ikiwiki/IkiWiki/Plugin/relative.pm ikidev/IkiWiki/Plugin/r
 +              }
 +      }
 +      return IkiWiki::FailReason->new("$parent can't match $spec against anything");
 +              }
 +      }
 +      return IkiWiki::FailReason->new("$parent can't match $spec against anything");

-+} #}}}
++}

 +
 +

-+sub match_has_child($$;@) { #{{{
++sub match_has_child($$;@) {

 +      my $page = shift;
 +      my $childname = shift;
 +      my $spec;
 +      my $page = shift;
 +      my $childname = shift;
 +      my $spec;

-+      if ($childname) { #{{{
++      if ($childname) {

 +              $spec = "$page/$childname or $page/*/$childname";
 +              $spec = "$page/$childname or $page/*/$childname";

-+      } #}}}
-+      else { #{{{
++      }
++      else {

 +              $spec = "$page/*";
 +              $spec = "$page/*";

-+      } #}}}
++      }

 +
 +      return match_relative($page, $spec, @_);
 +
 +      return match_relative($page, $spec, @_);

-+} #}}}
++}

 +
 +1
 </pre>
 
 +
 +1
 </pre>
 

-> This looks really interesting.  It reminds me of XPath and its conditionals.
+[[!tag patch]]
+
+> This looks really interesting.  It reminds me of [[!wikipedia XPath]] and its conditionals.

 > Those might actually work well adapted to pagespecs.  For instance, to write
 > "match any page with a child blah", you could just write *[blah] , or if you
 > don't want to use relative-by-default in the conditionals, *[./blah].
 > -- [[JoshTriplett]]
 > Those might actually work well adapted to pagespecs.  For instance, to write
 > "match any page with a child blah", you could just write *[blah] , or if you
 > don't want to use relative-by-default in the conditionals, *[./blah].
 > -- [[JoshTriplett]]

+
+> And it [[!taglink also_reminds_me|pagespec_in_DL_style]] of [[!wikipedia description logics]]: of course, given the relation `subpage` one could write a description-logic-style formula which would define the class of pages that are ("existentially") in a given relation (`subpage` or `inverse(subpage)*subpage`) to a certain other class of pages (e.g., named "blah") ("existentially" means there must exist a page, e.g., named "blah", which is in the given relation to the candidate).
+
+> Probably the model behind XPath is similar (although I don't know enough to say this definitely).--Ivan Z.