678 lines
32 KiB
Markdown
678 lines
32 KiB
Markdown
[[!tag patch patch/core]]
|
||
|
||
I like the idea of [[tips/integrated_issue_tracking_with_ikiwiki]], and I do so on several wikis. However, as far as I can tell, ikiwiki has no functionality which can represent dependencies between bugs and allow pagespecs to select based on dependencies. For instance, I can't write a pagespec which selects all bugs with no dependencies on bugs not marked as done. --[[JoshTriplett]]
|
||
|
||
> I started having a think about this. I'm going to start with the idea that expanding
|
||
> the pagespec syntax is the way to attack this. It seems that any pagespec that is going
|
||
> to represent "all bugs with no dependencies on bugs not marked as done" is going to
|
||
> need some way to represent "bugs not marked as done" as a collection of pages, and
|
||
> then represent "bugs which do not link to pages in the previous collection".
|
||
>
|
||
> One way to do this would be to introduce variables into the pagespec, along with
|
||
> universal and/or existential [[!wikipedia Quantification]]. That looks quite complex.
|
||
>
|
||
>> I thought about this briefly, and got about that far.. glad you got
|
||
>> further. :-) --[[Joey]]
|
||
|
||
>> Or, one [[!taglink could_also_refer|pagespec_in_DL_style]] to the language of [[!wikipedia description logics]]: their formulas actually define classes of objects through quantified relations to other classes. --Ivan Z.
|
||
>
|
||
> Another option would be go with a more functional syntax. The concept here would
|
||
> be to allow a pagespec to appear in a 'pagespec function' anywhere a page can. e.g.
|
||
> I could pass a pagespec to `link()` and that would return true if there is a link to any
|
||
> page matching the pagespec. This makes the variables and existential quantification
|
||
> implicit. It would allow the example requested above:
|
||
>
|
||
>> `bugs/* and !*/Discussion and !link(bugs/* and !*/Discussion and !link(done))`
|
||
>
|
||
> Unfortunately, this is also going to make the pagespec parsing more complex because
|
||
> we now need to parse nested sets of parentheses to know when the nested pagespec
|
||
> ends, and that isn't a regular language (we can't use regular expression matching for
|
||
> easy parsing).
|
||
>
|
||
>> Also, it may cause ambiguities with page names that contain parens
|
||
>> (though some such ambigutities already exist with the pagespec syntax).
|
||
>
|
||
> One simplification of that would be to introduce some pagespec [[shortcuts]]. We could
|
||
> then allow pagespec functions to take either pages, or named pagespec shortcuts. The
|
||
> pagespec shortcuts would just be listed on a special page, like current [[shortcuts]].
|
||
> (It would probably be a good idea to require that shortcuts on that page can only refer
|
||
> to named pagespecs higher up that page than themselves. That would stop some
|
||
> looping issues...) These shortcuts would be used as follows: when trying to match
|
||
> a page (without globs) you look to see if the page exists. If it does then you have a
|
||
> match. If it doesn't, then you look to see if a similarly named pagespec shortcut
|
||
> exists. If it does, then you check that pagespec recursively to see if you have a match.
|
||
> The ordering requirement on named pagespecs stops infinite recursion.
|
||
>
|
||
> Does that seem like a reasonable first approach?
|
||
>
|
||
> -- [[Will]]
|
||
|
||
>> Having a separate page for the shortcuts feels unwieldly.. perhaps
|
||
>> instead the shortcut could be defined earlier in the scope of the same
|
||
>> pagespec that uses it?
|
||
>>
|
||
>> Example: `define(~bugs, bugs/* and !*/Discussion) and define(~openbugs, ~bugs and !link(done)) and ~openbugs and !link(~openbugs)`
|
||
|
||
>>> That could work. parens are only ever nested 1 deep in that grammar so it is regular and the current parsing would be ok.
|
||
|
||
>> Note that I made the "~" explicit, not implicit, so it could be left out. In the case of ambiguity between
|
||
>> a definition and a page name, the definition would win.
|
||
|
||
>>> That was my initial thought too :), but when implementing it I decided that requiring the ~ made things easier. I'll probably require the ~ for the first pass at least.
|
||
|
||
>> So, equivilant example: `define(bugs, bugs/* and !*/Discussion) and define(openbugs, bugs and !link(done)) and openbugs and !link(openbugs)`
|
||
>>
|
||
|
||
>> Re recursion, it is avoided.. but building a pagespec that is O(N^X) where N is the
|
||
>> number of pages in the wiki is not avoided. Probably need to add DOS prevention.
|
||
>> --[[Joey]]
|
||
|
||
>>> If you memoize the outcomes of the named pagespecs you can make in O(N.X), no?
|
||
>>> -- [[Will]]
|
||
|
||
>>>> Yeah, guess that'd work. :-)
|
||
|
||
> <a id="another_kind_of_links" />One quick further thought. All the above discussion assumes that 'dependency' is the
|
||
> same as 'links to', which is not really true. For example, you'd like to be able to say
|
||
> "This bug does not depend upon [ [ link to other bug ] ]" and not have a dependency.
|
||
> Without having different types of links, I don't see how this would be possible.
|
||
>
|
||
> -- [[Will]]
|
||
|
||
>> I saw that this issue is targeted at by the work on [[structured page data#another_kind_of_links]]. --Ivan Z.
|
||
|
||
Okie - I've had a quick attempt at this. Initial patch attached. This one doesn't quite work.
|
||
And there is still a lot of debugging stuff in there.
|
||
|
||
At the moment I've added a new preprocessor plugin, `definepagespec`, which is like
|
||
shortcut for pagespecs. To reference a named pagespec, use `~` like this:
|
||
|
||
[ [!definepagespec name="bugs" spec="bugs/* and !*/Discussion"]]
|
||
[ [!definepagespec name="openbugs" spec="~bugs and !link(done)"]]
|
||
[ [!definepagespec name="readybugs" spec="~openbugs and !link(~openbugs)"]]
|
||
|
||
At the moment the problem is in `match_link()` when we're trying to find a sub-page that
|
||
matches the appropriate page spec. There is no good list of pages available to iterate over.
|
||
|
||
foreach my $nextpage (keys %IkiWiki::pagesources)
|
||
|
||
does not give me a good list of pages. I found the same thing when I was working on
|
||
this todo [[todo/Add_a_plugin_to_list_available_pre-processor_commands]].
|
||
|
||
> I'm not sure why iterating over `%pagesources` wouldn't work here, it's the same method
|
||
> used by anything that needs to match a pagespec against all pages..? --[[Joey]]
|
||
|
||
>> My uchecked hypothesis is that %pagesources is created after the refresh hook.
|
||
>> I've also been concerned about how globally defined pagespec shortcuts would interact with
|
||
>> the page dependancy system. Your idea of internally defined shortcuts should fix that. -- [[Will]]
|
||
|
||
>>> You're correct, the refresh hook is run very early, before pagesources
|
||
>>> is populated. (It will be partially populated on a refresh, but will
|
||
>>> not be updated to reflect new pages.) Agree that internally defined
|
||
>>> seems the way to go. --[[Joey]]
|
||
|
||
Immediately below is a patch which seems to basically work. Lots of debugging code is still there
|
||
and it needs a cleanup, but I thought it worth posting at this point. (I was having problems
|
||
with old style glob lists, so i just switched them off for the moment.)
|
||
|
||
The following three inlines work for me with this patch:
|
||
|
||
Bugs:
|
||
|
||
[ [!inline pages="define(~bugs, bugs/* and ! */Discussion) and ~bugs" archive="yes"]]
|
||
|
||
OpenBugs:
|
||
|
||
[ [!inline pages="define(~bugs, bugs/* and ! */Discussion) and define(~openbugs,~bugs and !link(done)) and ~openbugs" archive="yes"]]
|
||
|
||
ReadyBugs:
|
||
|
||
[ [!inline pages="define(~bugs, bugs/* and ! */Discussion) and define(~openbugs,~bugs and !link(done)) and define(~readybugs,~openbugs and !link(~openbugs)) and ~readybugs" archive="yes"]]
|
||
|
||
> Nice! Could the specfuncsref be passed in %params? I'd like to avoid
|
||
> needing to change the prototype of every pagespec function, since several
|
||
> plugins define them too. --[[Joey]]
|
||
|
||
>> Maybe - it needs more thought. I also considered it when I was going though changing all those plugins :).
|
||
>> My concern was that `%params` can contain other user-defined parameters,
|
||
>> e.g. `link(target, otherparameter)`, and that means that the specFuncs could be clobbered by a user (or other
|
||
>> weird security hole). I thought it better to separate it, but I didn't think about it too hard. I might move it to
|
||
>> the first parameter rather than the second. Ikiwiki is my first real perl hacking and I'm still discovering
|
||
>> good ways to write things in perl.
|
||
>>
|
||
>>>> `%params` contains the parameters passed to `pagespec_match`, not
|
||
>>>> user-supplied parameters. The user-supplied parameter to a function
|
||
>>>> like `match_glob()` or `match_link()` is passed in the second positional parameter. --[[Joey]]
|
||
|
||
>>>>> OK. That seems reasonable then. The only problem is that my PERLfu is not strong enough to make it
|
||
>>>>> work. I really have to wonder what substance was influencing the designers of PERL...
|
||
>>>>> I can't figure out how to use the %params. And I'm pissed off enough with PERL that I'm not going
|
||
>>>>> to try and figure it out any more. There are two patches below now. The first one uses an extra
|
||
>>>>> argument and works. The second one tries to use %params and doesn't - take your pick :-). -- [[Will]]
|
||
|
||
>> What do you think is best to do about `is_globlist()`? At the moment it requires that the 'second word', as
|
||
>> delimited by a space and ignoring parens, is 'and' or 'or'. This doesn't hold in the above example pagespecs (so I just hard wired it to 0 to test my patch).
|
||
>> My thought was just to search for 'and' or 'or' as words anywhere in the pagespec. Thoughts?
|
||
|
||
>>> Dunno, we could just finish deprecating it. Or change the regexp to
|
||
>>> skip over spaces in parens. (`/[^\s]+\s+([^)]+)/`) --[[Joey]]
|
||
|
||
>>>> I think I have a working regexp now.
|
||
|
||
>> Oh, one more thing. In pagespec_translate (now pagespec_makeperl), there is a part of the regular expression for `# any other text`.
|
||
>> This contained `()`, which has no effect. I replaced that with `\(\)`, but that is a change in the definition of pagespecs unrelated to the
|
||
>> rest of this patch. In a related change, commands were not able to contain `)` in their parameters. I've extended that so the cannot
|
||
>> contain `(` or `)`. -- [[Will]]
|
||
|
||
>>> `[^\s()]+` is a character class matching all characters not spaces or
|
||
>>> parens. Since the pervious terminals in the regexp consume most
|
||
>>> occurances of an open paren or close paren, it's unlikely for one to
|
||
>>> get through to that part of the regexp. For example, "foo()" will be
|
||
>>> matched by the command matcher; "(foo)" will be matched by the open
|
||
>>> paren literal terminal. "foo(" and "foo)" can get through to the
|
||
>>> end, and would be matched as a page name, if it didn't exclude parens.
|
||
>>>
|
||
>>> So why exclude them? Well, consider "foo and(bar and baz)". We don't
|
||
>>> want it to match "and(" as a page name!
|
||
>>>
|
||
>>> Escaping the parens in the character class actually changes nothing; the
|
||
>>> changed character class still matches all characters not spaces or
|
||
>>> parens. (Try it!).
|
||
>>>
|
||
>>> Re commands containing '(', I don't really see any reason not to
|
||
>>> allow that, unless it breaks something. --[[Joey]]
|
||
|
||
>>>> Oh, I didn't realise you didn't need to escape parens inside []. All else I
|
||
>>>> I understood. I have stopped commands from containing parens because
|
||
>>>> once you allow that then you might have a extra level of depth in the parsing
|
||
>>>> of define() statements. -- [[Will]]
|
||
|
||
>>> Updated patch. Moved the specFuncsRef to the front of the arg list. Still haven't thought through the security implications of
|
||
>>> having it in `%params`. I've also removed all the debugging `print` statements. And I've updated the `is_globlist()` function.
|
||
>>> I think this is ready for people other than me to have a play. It is not well enough tested to commit just yet.
|
||
>>> -- [[Will]]
|
||
|
||
I've lost track of the indent level, so I'm going back to not indented - I think this is a working [[patch]] taking into
|
||
account all comments above (which doesn't mean it is above reproach :) ). --[[Will]]
|
||
|
||
> Very belated code review of last version of the patch:
|
||
>
|
||
> * `is_globlist` is no longer needed
|
||
|
||
>> Good :)
|
||
|
||
> * I don't understand why the pagespec match regexp is changed
|
||
> from having flags `igx` to `ixgs`. Don't see why you
|
||
> want `.` to match '\n` in it, and don't see any `.` in the regexp
|
||
> anyway?
|
||
|
||
>> Because you have to define all the named pagespecs in the pagespec, you sometimes end up with very long pagespecs. I found it useful to split them over multiple lines. That didn't work at one point and I added the 's' to make it work. I may have further altered the regex since then to make the 's' redundant. Remove it and see if multi-line pagespecs still work. :)
|
||
|
||
>>> Well, I can tell you that multi-line pagespecs are supported w/o
|
||
>>> your patch .. I use them all the time. The reason I find your
|
||
>>> use of `/s` unlikely is because without it `\s` already matches
|
||
>>> a newline. Only if you want to treat a newline as non-whitespace
|
||
>>> is `/s` typically necessary. --[[Joey]]
|
||
|
||
> * Some changes of `@_` to `%params` in `pagespec_makeperl` do not
|
||
> make sense to me. I don't see where \%params is defined and populated,
|
||
> except with `\$params{specFunc}`.
|
||
|
||
>> I'm not a perl hacker. This was a mighty battle for me to get going.
|
||
>> There is probably some battlefield carnage from my early struggles
|
||
>> learning perl left here. Part of this is that @_ / @params already
|
||
>> existed as a way of passing in extra parameters. I didn't want to
|
||
>> pollute that top level namespace - just at my own parameter (a hash)
|
||
>> which contained the data I needed.
|
||
|
||
>>> I think I understand how the various `%params`
|
||
>>> (there's not just one) work in your code now, but it's really a mess.
|
||
>>> Explaining it in words would take pages.. It could be fixed by,
|
||
>>> in `pagespec_makeperl` something like:
|
||
>>>
|
||
>>> my %specFuncs;
|
||
>>> push @_, specFuncs => \%specFuncs;
|
||
>>>
|
||
>>> With that you have the hash locally available for populating
|
||
>>> inside `pagespec_makeperl`, and when the `match_*` functions
|
||
>>> are called the same hash data will be available inside their
|
||
>>> `@_` or `%params`. No need to change how the functions are called
|
||
>>> or do any of the other hacks.
|
||
>>>
|
||
>>> Currently, specFuncs is populated by building up code
|
||
>>> that recursively calls `pagespec_makeperl`, and is then
|
||
>>> evaluated when the pagespec gets evaluated. My suggested
|
||
>>> change to `%params` will break that, but that had to change
|
||
>>> anyway.
|
||
>>>
|
||
>>> It probably has a security hole, and is certianly inviting
|
||
>>> one, since the pagespec definition is matched by a loose regexp (`.*`)
|
||
>>> and then subject to string interpolation before being evaluated
|
||
>>> inside perl code. I recently changed ikiwiki to never interpolate
|
||
>>> user-supplied strings when translating pagespecs, and that
|
||
>>> needs to happen here too. The obvious way, it seems to me,
|
||
>>> is to not generate perl code, but just directly run perl code that
|
||
>>> populates specFuncs.
|
||
|
||
>>>> I don't think this is as bad as you make out, but your addition of the
|
||
>>>> data array will break with the recursion my patch adds in pagespec_makeperl.
|
||
>>>> To fix that I'll need to pass a reference to that array into pagespec_makeperl.
|
||
>>>> I think I can then do the same thing to $params{specFuncs}. -- [[Will]]
|
||
|
||
>>>>> You're right -- I did not think the recursive case through.
|
||
>>>>> --[[Joey]]
|
||
|
||
> * Seems that the only reason `match_glob` has to check for `~` is
|
||
> because when a named spec appears in a pagespec, it is translated
|
||
> to `match_glob("~foo")`. If, instead, `pagespec_makeperl` checked
|
||
> for named specs, it could convert them into `check_named_spec("foo")`
|
||
> and avoid that ugliness.
|
||
|
||
>> Yeah - I wanted to make named specs syntactically different on my first pass. You are right in that this could be made a fallback - named specs always override pagenames.
|
||
|
||
> * The changes to `match_link` seem either unecessary, or incomplete.
|
||
> Shouldn't it check for named specs and call
|
||
> `check_named_spec_existential`?
|
||
|
||
>> An earlier version did. Then I realised it wasn't actually needed in that case - match_link() already included a loop that was like a type of existential matching. Each time through the loop it would
|
||
>> call match_glob(). match_glob() in turn will handle the named spec. I tested this version briefly and it seemed to work. I remember looking at this again later and wondering if I had mis-understood
|
||
>> some of the logic in match_link(), which might mean there are cases where you would need an explicit call to check_named_spec_existential() - I never checked it properly after having that thought.
|
||
|
||
>>> In the common case, `match_link` does not call `match_glob`,
|
||
>>> because the link target it is being asked to check for is a single
|
||
>>> page name, not a glob.
|
||
|
||
>>>> A named pagespec should fall into the glob case. These two pagespecs should be the same:
|
||
|
||
link(a*)
|
||
|
||
>>>> and
|
||
|
||
define(aStar, a*) and link(~aStar)
|
||
|
||
>>>> In the first case, we want the pagespec to match any page that links to a page matching the glob.
|
||
>>>> In the second case, we want the pagespec to match any page that links to a page matching the named spec.
|
||
>>>> match_link() was already doing existential part. The patches to this code were simply to remove the `lc()`
|
||
>>>> call from the named pagespec name. Can that `lc` be removed entirely? -- [[Will]]
|
||
|
||
>>>>> I think we could get rid of it. `bestlink` will lc it itself
|
||
>>>>> if the uppercase version does not exist; `match_glob` matches
|
||
>>>>> insensitively.
|
||
>>>>> --[[Joey]]
|
||
|
||
> * Generally, the need to modify `match_*` functions so that they
|
||
> check for and handle named pagespecs seems suboptimal, if
|
||
> only because there might be others people may want to use named
|
||
> pagespecs with. It would be possible to move this check
|
||
> to `pagespec_makeperl`, by having it check if the parameter
|
||
> passed to a pagespec function looked like a named pagespec.
|
||
> The only issue is that some pagespec functions take a parameter
|
||
> that is not a page name at all, and it could be weird
|
||
> if such a parameter were accidentially interpreted as a named
|
||
> pagespec. (But, that seems unlikely to happen.)
|
||
|
||
>> Possibly. I'm not sure which I prefer between the current solution and that one. Each have advantages and disadvantages.
|
||
>> It really isn't much code for the match functions to add a call to check_named_spec_existential().
|
||
|
||
>>> But if a plugin adds its own match function, it has
|
||
>>> to explicitly call that code to support named pagespecs.
|
||
|
||
>>>> Yes, and it can do that in just three lines of code. But if we automatically check for named pagespecs all the time we
|
||
>>>> potentially break any matching function that doesn't accept pages, or wants to use multiple arguments.
|
||
|
||
>>>>> 3 lines of code, plus the functions called become part of the API,
|
||
>>>>> don't forget about that..
|
||
>>>>>
|
||
>>>>> Yes, I think that is the tradeoff, the question is whether to export
|
||
>>>>> the additional complexity needed for that flexability.
|
||
>>>>>
|
||
>>>>> I'd be suprised if multiple argument pagespecs become necessary..
|
||
>>>>> with the exception of this patch there has been no need for them yet.
|
||
>>>>>
|
||
>>>>> There are lots of pagespecs that take data other than pages,
|
||
>>>>> indeed, that's really the common case. So far, none of them
|
||
>>>>> seem likely to take data that starts with a `~`. Perhaps
|
||
>>>>> the thing to do would be to check if `~foo` is a known,
|
||
>>>>> named pagespec, and if not, just pass it through unchanged.
|
||
>>>>> Then there's little room for ambiguity, and this also allows
|
||
>>>>> pagespecs like `glob(~foo*)` to match the literal page `~foo`.
|
||
>>>>> (It will make pagespec_merge even harder tho.. see below.)
|
||
>>>>> --[[Joey]]
|
||
|
||
>>>>>> I've already used multi-argument pagespec match functions in
|
||
>>>>>> my data plugin. It is used for having different types of links. If
|
||
>>>>>> you want to have multiple types of links, then the match function
|
||
>>>>>> for them needs to take both the link name and the link type.
|
||
>>>>>> I'm trying to think of a way we could have both - automatically
|
||
>>>>>> handle the existential case unless the function indicates somehow
|
||
>>>>>> that it'll do it itself. Any ideas? -- [[Will]]
|
||
|
||
> * I need to check if your trick to avoid infinite recursion
|
||
> works if there are two named specs that recursively
|
||
> call one-another. I suspect it does, but will test this
|
||
> myself..
|
||
|
||
>> It worked for me. :)
|
||
|
||
> * I also need to verify if memoizing the named pagespecs has
|
||
> really guarded against very expensive pagespecs DOSing the wiki..
|
||
|
||
> --[[Joey]]
|
||
|
||
>> There is one issue that I've been thinking about that I haven't raised anywhere (or checked myself), and that is how this all interacts with page dependencies.
|
||
>>
|
||
>>> I've moved the discussion of that to [[dependency_types]]. --[[Joey]]
|
||
>>
|
||
>> I'm not sure anymore that the `pagespec_merge` function will continue to work in all cases.
|
||
|
||
>>> The problem I can see there is that if two pagespecs
|
||
>>> get merged and both use `~foo` but define it differently,
|
||
>>> then the second definition might be used at a point when
|
||
>>> it shouldn't (but I haven't verified that really happens).
|
||
>>> That could certianly be a show-stopper. --[[Joey]]
|
||
|
||
>>>> I think this can happen in the new closure based code. I don't think this could happen in the old code. -- [[Will]]
|
||
|
||
>>>> Even if that works, this is a good argument for having a syntactic difference between named pagespecs and normal pages.
|
||
>>>> If you're joining two pagespecs with 'or', you don't want a named pagespec in the first part overriding a page name in the
|
||
>>>> second part. Oh, and I assume 'or' has the right operator precedence that "a and b or c" is "(a and b) or c", and not "a and (b or c)" -- [[Will]]
|
||
|
||
>>>>> Looks like its bracketed in the code anyway... -- [[Will]]
|
||
|
||
>>>> Perhaps the thing to do is to have a `clear_defines()`
|
||
>>>> function, then merging `A` and `B` yields `(A) or (clear_defines() and (B))`
|
||
>>>> That would deal with both the cases where `A` and `B` differently
|
||
>>>> define `~foo` as well as with the case where `A` defines `~foo` while
|
||
>>>> `B` uses it to refer to a literal page.
|
||
>>>> --[[Joey]]
|
||
|
||
>>>>> I don't think this will work with the new patch, and I don't think it was needed with the old one.
|
||
>>>>> Under the old patch, pagespec_makeperl() generated a string of unevaluated, self-contained, perl
|
||
>>>>> code. When a new named pagespec was defined, a recursive call was made to get the perl code
|
||
>>>>> for the pagespec, and then that code was used to add something like `$params{specFuncs}->{name} = sub {recursive code} and `
|
||
>>>>> to the result of the calling function. This means that at pagespec testing time, when this code is executed, the
|
||
>>>>> specFuncs hash is built up as the pagespec is checked. In the case of the 'or' used above, later redefinitions of
|
||
>>>>> a named pagespec would have redefined the specFunc at the right time. It should have just worked. However...
|
||
|
||
>>>>> Since my original patch, you started using closures for security reasons (and I can see the case for that). Unfortunately this
|
||
>>>>> means that the generated perl code is no longer self-contained - it needs to be evaluated in the same closure it was generated
|
||
>>>>> so that it has access to the data array. To make this work with the recursive call I had two options: a) make the data array a
|
||
>>>>> reference that I pass around through the pagespec_makeperl() functions and have available when the code is finally evaluated
|
||
>>>>> in pagespec_translate(), or b) make sure that each pagespec is evaluated in its correct closure and a perl function is returned, not a
|
||
>>>>> string containing unevaluated perl code.
|
||
|
||
>>>>> I went with option b). I did it in such a way that the hash of specfuncs is built up at translation time, not at execution time. This
|
||
>>>>> means that with the new code you can call specfuncs that get defined out of order:
|
||
|
||
~test and define(~test, blah)
|
||
|
||
>>>>> but it also means that using a simple 'or' to join two pagespecs wont work. If you do something like this:
|
||
|
||
~test and define(~test, foo) and define(~test, baz)
|
||
|
||
>>>>> then the last definition (baz) takes precedence.
|
||
>>>>> In the process of writing this I think I've come up with a way to change this back the way it was, still using closures. -- [[Will]]
|
||
|
||
>>> My [[remove-pagespec-merge|should_optimise_pagespecs]] branch has now
|
||
>>> solved all this by deleting the offending function :-) --[[smcv]]
|
||
|
||
|
||
|
||
Patch updated to use closures rather than inline generated code for named pagespecs. Also includes some new use of ErrorReason where appropriate. -- [[Will]]
|
||
|
||
> * Perl really doesn't need forward declarations, honest!
|
||
|
||
>> It complained (warning, not error) when I didn't use the forward declaration. :(
|
||
|
||
> * I have doubts about memoizing the anonymous sub created by
|
||
> `pagespec_translate`.
|
||
|
||
>> This is there explicitly to make sure that runtime is polynomial and not exponential.
|
||
|
||
> * Think where you wrote `+{}` you can just write `{}`
|
||
|
||
>> Possibly :) -- [[Will]]
|
||
|
||
----
|
||
|
||
diff --git a/IkiWiki.pm b/IkiWiki.pm
|
||
index 061a1c6..1e78a63 100644
|
||
--- a/IkiWiki.pm
|
||
+++ b/IkiWiki.pm
|
||
@@ -1774,8 +1774,12 @@ sub pagespec_merge ($$) {
|
||
return "($a) or ($b)";
|
||
}
|
||
|
||
-sub pagespec_translate ($) {
|
||
+# is perl really so dumb it requires a forward declaration for recursive calls?
|
||
+sub pagespec_translate ($$);
|
||
+
|
||
+sub pagespec_translate ($$) {
|
||
my $spec=shift;
|
||
+ my $specFuncsRef=shift;
|
||
|
||
# Convert spec to perl code.
|
||
my $code="";
|
||
@@ -1789,7 +1793,9 @@ sub pagespec_translate ($) {
|
||
|
|
||
\) # )
|
||
|
|
||
- \w+\([^\)]*\) # command(params)
|
||
+ define\(\s*~\w+\s*,((\([^()]*\)) | ([^()]+))+\) # define(~specName, spec) - spec can contain parens 1 deep
|
||
+ |
|
||
+ \w+\([^()]*\) # command(params) - params cannot contain parens
|
||
|
|
||
[^\s()]+ # any other text
|
||
)
|
||
@@ -1805,10 +1811,19 @@ sub pagespec_translate ($) {
|
||
elsif ($word eq "(" || $word eq ")" || $word eq "!") {
|
||
$code.=' '.$word;
|
||
}
|
||
- elsif ($word =~ /^(\w+)\((.*)\)$/) {
|
||
+ elsif ($word =~ /^define\(\s*(~\w+)\s*,(.*)\)$/s) {
|
||
+ my $name = $1;
|
||
+ my $subSpec = $2;
|
||
+ my $newSpecFunc = pagespec_translate($subSpec, $specFuncsRef);
|
||
+ return if $@ || ! defined $newSpecFunc;
|
||
+ $specFuncsRef->{$name} = $newSpecFunc;
|
||
+ push @data, qq{Created named pagespec "$name"};
|
||
+ $code.="IkiWiki::SuccessReason->new(\$data[$#data])";
|
||
+ }
|
||
+ elsif ($word =~ /^(\w+)\((.*)\)$/s) {
|
||
if (exists $IkiWiki::PageSpec::{"match_$1"}) {
|
||
push @data, $2;
|
||
- $code.="IkiWiki::PageSpec::match_$1(\$page, \$data[$#data], \@_)";
|
||
+ $code.="IkiWiki::PageSpec::match_$1(\$page, \$data[$#data], \@_, specFuncs => \$specFuncsRef)";
|
||
}
|
||
else {
|
||
push @data, qq{unknown function in pagespec "$word"};
|
||
@@ -1817,7 +1832,7 @@ sub pagespec_translate ($) {
|
||
}
|
||
else {
|
||
push @data, $word;
|
||
- $code.=" IkiWiki::PageSpec::match_glob(\$page, \$data[$#data], \@_)";
|
||
+ $code.=" IkiWiki::PageSpec::match_glob(\$page, \$data[$#data], \@_, specFuncs => \$specFuncsRef)";
|
||
}
|
||
}
|
||
|
||
@@ -1826,7 +1841,7 @@ sub pagespec_translate ($) {
|
||
}
|
||
|
||
no warnings;
|
||
- return eval 'sub { my $page=shift; '.$code.' }';
|
||
+ return eval 'memoize (sub { my $page=shift; '.$code.' })';
|
||
}
|
||
|
||
sub pagespec_match ($$;@) {
|
||
@@ -1839,7 +1854,7 @@ sub pagespec_match ($$;@) {
|
||
unshift @params, 'location';
|
||
}
|
||
|
||
- my $sub=pagespec_translate($spec);
|
||
+ my $sub=pagespec_translate($spec, +{});
|
||
return IkiWiki::ErrorReason->new("syntax error in pagespec \"$spec\"")
|
||
if $@ || ! defined $sub;
|
||
return $sub->($page, @params);
|
||
@@ -1850,7 +1865,7 @@ sub pagespec_match_list ($$;@) {
|
||
my $spec=shift;
|
||
my @params=@_;
|
||
|
||
- my $sub=pagespec_translate($spec);
|
||
+ my $sub=pagespec_translate($spec, +{});
|
||
error "syntax error in pagespec \"$spec\""
|
||
if $@ || ! defined $sub;
|
||
|
||
@@ -1872,7 +1887,7 @@ sub pagespec_match_list ($$;@) {
|
||
sub pagespec_valid ($) {
|
||
my $spec=shift;
|
||
|
||
- my $sub=pagespec_translate($spec);
|
||
+ my $sub=pagespec_translate($spec, +{});
|
||
return ! $@;
|
||
}
|
||
|
||
@@ -1919,6 +1934,68 @@ sub new {
|
||
|
||
package IkiWiki::PageSpec;
|
||
|
||
+sub check_named_spec($$;@) {
|
||
+ my $page=shift;
|
||
+ my $specName=shift;
|
||
+ my %params=@_;
|
||
+
|
||
+ return IkiWiki::ErrorReason->new("Unable to find specFuncs in params to check_named_spec()!")
|
||
+ unless exists $params{specFuncs};
|
||
+
|
||
+ my $specFuncsRef=$params{specFuncs};
|
||
+
|
||
+ return IkiWiki::ErrorReason->new("Named page spec '$specName' is not valid")
|
||
+ unless (substr($specName, 0, 1) eq '~');
|
||
+
|
||
+ if (exists $specFuncsRef->{$specName}) {
|
||
+ # remove the named spec from the spec refs
|
||
+ # when we recurse to avoid infinite recursion
|
||
+ my $sub = $specFuncsRef->{$specName};
|
||
+ delete $specFuncsRef->{$specName};
|
||
+ my $result = $sub->($page, %params);
|
||
+ $specFuncsRef->{$specName} = $sub;
|
||
+ return $result;
|
||
+ } else {
|
||
+ return IkiWiki::ErrorReason->new("Page spec '$specName' does not exist");
|
||
+ }
|
||
+}
|
||
+
|
||
+sub check_named_spec_existential($$$;@) {
|
||
+ my $page=shift;
|
||
+ my $specName=shift;
|
||
+ my $funcref=shift;
|
||
+ my %params=@_;
|
||
+
|
||
+ return IkiWiki::ErrorReason->new("Unable to find specFuncs in params to check_named_spec_existential()!")
|
||
+ unless exists $params{specFuncs};
|
||
+ my $specFuncsRef=$params{specFuncs};
|
||
+
|
||
+ return IkiWiki::ErrorReason->new("Named page spec '$specName' is not valid")
|
||
+ unless (substr($specName, 0, 1) eq '~');
|
||
+
|
||
+ if (exists $specFuncsRef->{$specName}) {
|
||
+ # remove the named spec from the spec refs
|
||
+ # when we recurse to avoid infinite recursion
|
||
+ my $sub = $specFuncsRef->{$specName};
|
||
+ delete $specFuncsRef->{$specName};
|
||
+
|
||
+ foreach my $nextpage (keys %IkiWiki::pagesources) {
|
||
+ if ($sub->($nextpage, %params)) {
|
||
+ my $tempResult = $funcref->($page, $nextpage, %params);
|
||
+ if ($tempResult) {
|
||
+ $specFuncsRef->{$specName} = $sub;
|
||
+ return IkiWiki::SuccessReason->new("Existential check of '$specName' matches because $tempResult");
|
||
+ }
|
||
+ }
|
||
+ }
|
||
+
|
||
+ $specFuncsRef->{$specName} = $sub;
|
||
+ return IkiWiki::FailReason->new("No page in spec '$specName' was successfully matched");
|
||
+ } else {
|
||
+ return IkiWiki::ErrorReason->new("Named page spec '$specName' does not exist");
|
||
+ }
|
||
+}
|
||
+
|
||
sub derel ($$) {
|
||
my $path=shift;
|
||
my $from=shift;
|
||
@@ -1937,6 +2014,10 @@ sub match_glob ($$;@) {
|
||
my $glob=shift;
|
||
my %params=@_;
|
||
|
||
+ if (substr($glob, 0, 1) eq '~') {
|
||
+ return check_named_spec($page, $glob, %params);
|
||
+ }
|
||
+
|
||
$glob=derel($glob, $params{location});
|
||
|
||
my $regexp=IkiWiki::glob2re($glob);
|
||
@@ -1959,8 +2040,9 @@ sub match_internal ($$;@) {
|
||
|
||
sub match_link ($$;@) {
|
||
my $page=shift;
|
||
- my $link=lc(shift);
|
||
+ my $fullLink=shift;
|
||
my %params=@_;
|
||
+ my $link=lc($fullLink);
|
||
|
||
$link=derel($link, $params{location});
|
||
my $from=exists $params{location} ? $params{location} : '';
|
||
@@ -1975,25 +2057,37 @@ sub match_link ($$;@) {
|
||
}
|
||
else {
|
||
return IkiWiki::SuccessReason->new("$page links to page $p matching $link")
|
||
- if match_glob($p, $link, %params);
|
||
+ if match_glob($p, $fullLink, %params);
|
||
$p=~s/^\///;
|
||
$link=~s/^\///;
|
||
return IkiWiki::SuccessReason->new("$page links to page $p matching $link")
|
||
- if match_glob($p, $link, %params);
|
||
+ if match_glob($p, $fullLink, %params);
|
||
}
|
||
}
|
||
return IkiWiki::FailReason->new("$page does not link to $link");
|
||
}
|
||
|
||
sub match_backlink ($$;@) {
|
||
- return match_link($_[1], $_[0], @_);
|
||
+ my $page=shift;
|
||
+ my $backlink=shift;
|
||
+ my @params=@_;
|
||
+
|
||
+ if (substr($backlink, 0, 1) eq '~') {
|
||
+ return check_named_spec_existential($page, $backlink, \&match_backlink, @params);
|
||
+ }
|
||
+
|
||
+ return match_link($backlink, $page, @params);
|
||
}
|
||
|
||
sub match_created_before ($$;@) {
|
||
my $page=shift;
|
||
my $testpage=shift;
|
||
my %params=@_;
|
||
-
|
||
+
|
||
+ if (substr($testpage, 0, 1) eq '~') {
|
||
+ return check_named_spec_existential($page, $testpage, \&match_created_before, %params);
|
||
+ }
|
||
+
|
||
$testpage=derel($testpage, $params{location});
|
||
|
||
if (exists $IkiWiki::pagectime{$testpage}) {
|
||
@@ -2014,6 +2108,10 @@ sub match_created_after ($$;@) {
|
||
my $testpage=shift;
|
||
my %params=@_;
|
||
|
||
+ if (substr($testpage, 0, 1) eq '~') {
|
||
+ return check_named_spec_existential($page, $testpage, \&match_created_after, %params);
|
||
+ }
|
||
+
|
||
$testpage=derel($testpage, $params{location});
|
||
|
||
if (exists $IkiWiki::pagectime{$testpage}) {
|