From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christopher Genovese Subject: Re: full parser implementation for tag queries (parentheses, fast heading match, and more) Date: Sat, 4 Aug 2012 14:32:35 -0400 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary=047d7b2e4f6e94631804c674df38 Return-path: Received: from eggs.gnu.org ([208.118.235.92]:48648) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Sxj9r-0002jd-90 for emacs-orgmode@gnu.org; Sat, 04 Aug 2012 14:33:07 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Sxj9m-0005ka-2x for emacs-orgmode@gnu.org; Sat, 04 Aug 2012 14:33:03 -0400 Received: from mail-pb0-f41.google.com ([209.85.160.41]:37213) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Sxj9l-0005kW-9A for emacs-orgmode@gnu.org; Sat, 04 Aug 2012 14:32:58 -0400 Received: by pbbrp2 with SMTP id rp2so3539065pbb.0 for ; Sat, 04 Aug 2012 11:32:56 -0700 (PDT) In-Reply-To: List-Id: "General discussions about Org-mode." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-orgmode-bounces+geo-emacs-orgmode=m.gmane.org@gnu.org Sender: emacs-orgmode-bounces+geo-emacs-orgmode=m.gmane.org@gnu.org To: emacs-orgmode@gnu.org Cc: Christopher Genovese --047d7b2e4f6e94631804c674df38 Content-Type: multipart/alternative; boundary=047d7b2e4f6e94631204c674df36 --047d7b2e4f6e94631204c674df36 Content-Type: text/plain; charset=ISO-8859-1 I have attached an updated version of the files org-tag-query-parse.el and tag-query-tests.el that I posted about last night, and I have updated them at http://www.stat.cmu.edu/~genovese/emacs/ as well. I've also appended an updated version of my original note below for reference. The issue had to do with the /!? todo-matches in the queries. The bug in the 7.8 code that I described in Note h of my original post had to do with properly detecting when a /!? todo match is present. The approximate fix I suggested was incorrect; the complete fix was unnecessarily complicated. I realized all this a few minutes after the post (d'oh) and have now simplified things accordingly. The new version unifies the parsing of both kinds of queries. I eliminated a few functions as a result, and the new org-make-tags-matcher is even simpler. As a result, todo matching deals with all those edge cases correctly (like "PROP={^.*//.*$}") for free, also allows the {m,n} construct in todo regexp matches, just like it does in the tag matches. (Braces are escaped by doubling, e.g. {^.*B{{1,7}}} as I mentioned last time.) All the tests pass in a fresh session, both with compiled and non-compiled code, on 23.2 and 24.1. I'd appreciate any comments, suggestions, or other feedback you have on all this. Thanks for your patience, Christopher === Updated version of original post follows for reference I am writing an application layer on top of org that uses the entry mapping API, but I needed both negation of complex selections and heading searches. Because the current tag query parser does not handle parenthesized expressions, it does not allow negating complex queries. At first, I wrote a workaround solution that mimics/specializes the mapping API, but that approach seemed inelegant and harder to maintain. So instead I implemented a full parser for tag queries with a number of useful features (see the labeled Notes at the bottom for further comments on these features): 1. Parenthesized expressions to arbitrary depth are allowed. 2. A '-' can be used to negate a parenthesized term. [Note a] 3. Regex's in {} can contain braces escaped by doubling: {{ }}. [Note b] 4. Supports fast property search on HEADING and PRIORITY. [Note c] 5. Handles hyphens in property names properly. [Note d,h] 6. Allows only the proper comparison operators, including ==. [Note e,h] 7. Allows spaces around operators and terms for readability. [Note f] 8. Matchers use the original expression order; not a big deal, but free. 9. The error messages during parsing are reasonably helpful. 10. Several bug fixes and a cleaner `org-make-tags-matcher'. [Note h] I'm submitting the code for your consideration, with the goal of eventually incorporating this into org.el. I would be happy to hear any comments or suggestions you have. As I'll describe below, this involves relatively minor changes to two existing functions and adding a few new support functions. I've attached two files org-tag-query-parse.el (the code) and tag-query-tests.el (a collection of tests built on a simple framework). I've also put the files in http://www.stat.cmu.edu/~genovese/emacs/. The comments in both files will I hope be helpful. At the risk of going on too long, I'd like to add a few comments about the code and tests. First, the two existing functions that are affected in the code are `org-make-tags-matcher' and `org-scan-tags'. In the new version of the former, I've unified both kinds of query parsing, leading to a shorter and cleaner function.. The new version of the latter differs in only a couple *very minor* places that capture two values that were already being computed anyway (see the diff reproduced in the comments). By the way, I'm working from the 7.8.11 code. Loading org-tag-query-parse.el does not change the original functions. Instead, I've added a `-NEW' to the names of these functions and saved the originals also with a `-ORIGINAL' added. After loading the file, you can choose a version to try by doing (org-tmp-use-tag-parser 'new) and (org-tmp-use-tag-parser 'original) or do (org-tmp-use-tag-parser) to toggle between versions. You can also just use the names with suffixes directly. I'd also suggest byte-compiling the file. I think the place to start looking at the code is the new version of `org-make-tags-matcher'. The main workhorse for the new parser is `org-tag-query-parse', with new function `org-todo-query-parse' handling the /!? todo parsing at the appropriate point.. The other substantial piece (in terms of lines of code) is a utility macro `org-match-cond' that is used throughout and makes the main parser much more readable IMHO. Admittedly, I went a bit overboard in optimizing it; the first version worked fine but this one produces really nice code. I'd suggest ignoring this code (in section "Parsing utility for readable matchers") on first pass. The docstring is pretty complete, and its use is more or less self-explanatory. To run the tests, load org-tag-query-parse.el and tag-query-tests.el and do (tag-test-run :results) ; use :summary for a brief summary of all runs (tag-test-other-tests) ; miscellaneous other tests, including scanning or name individual suites. They are at the moment: (tag-test-run :results 'org-comparison-1) ; or use :summary (tag-test-run :results 'org-comparison-2) (tag-test-run :results 'match-results-1) (tag-test-run :results 'match-results-2) (tag-test-run :results 'should-error-1) If you have other ideas for tests or find any bugs, please let me know. Sorry for the homegrown framework; it just sort of grew and then I was too tired to rewrite the tests. One complication here is that the original and new algorithms produce different term orders and use a few different functions. The function tag-test-transform transforms original results to the new algorithms conventions, but it does not handle PRIORITY or HEADING matches at the moment. Use the tree form of the tess (see match-results-1 for example) on these. Btw, I've run the tests on GNU Emacs 23.2 and 24.1 (running on OS X lion). Notes: a. There is no need to introduce a new character such as ! for negation because the semantics of the - are clear and are consistent with its use for tags. A - binds more tightly than & which in turn binds more tightly than |. A + selector can also be used for positive selection of a parenthesized term but it is equivalent to using no selector, just as for tags. b. Because \'s are so heavily used in regex's and because they have to be doubled in strings, using \'s for an additional escape layer would be messy, ambiguous, and hard to read. Only the {}'s need to be escaped and the doubling escapes {{ -> { and }} -> } are simple, readable, and fast to parse. For example: "+{abc\\{{3,7\\}}}" gives the regex "abc\\{3,7\\}". Parity makes correctness clear at a glance. c. Because headline (and priority) searches can be useful and powerful, and because the information on those fields is *already processed* in `org-scan-tags', we get those special searches *essentially for free*, requiring only two minor changes to `org-scan-tags'. See the unified diff in comments. The special PRIORITY property already exists; I added the special HEADING property for these purposes. I'm open to changing the name of course, but I do think the feature is both useful and elegant. (I'm using it in my application, for instance.) d. I did not see it in the manual, but I think that property names with hyphens should have these \-escaped -'s in the query string, with the escaping slashes removed in the produced matcher. This is not currently done, but the new version does. See Note h for details. e. It seems desirable to support both = and == as equality operators since the latter is so common by habit. The new version allows this explicitly. The original version does as well, but the regex for the comparison operator also allows other operators <<, ><, >>, =>, and >= as well, which can produce bad matchers. See Note h for details. f. Currently, spaces are ignored around &, |, the implicit & between terms, around the comparison operators in property searches, and around +/- selectors. Spaces are not ignored inside {}'s for a regexp match. g. The current code also allows +/- selectors before property comparisons. I don't really like this because +PROP<>"something" and -PROP="something" have the same meaning but look very different. But the new code does support this. As a side note, there's really no need for the & characters as +/- serve the and/and-not function completely. But again, no prob. h. A few bugs detected in the 7.8.11 code: + Faulty test for todo matcher in org-make-tags-matcher (string-match "/+" match) Ex: (org-make-tags-matcher "PROP={^\\s-*// .*$}") produces an erroneous matcher: ("PROP={^\\s-*// .*$}" progn (setq org-cached-props nil) (member "PROP" tags-list)) Because {}'s can appear in /!? todo-match expressions, and becauseA arbitrary strings can be TODO keywords, a simple pattern match will not give a complete solution. For instance, both PROP={/!} and PROP="/!{/!}" are valid TODO keywords (it works!) *and* valid property comparisons. We want to find the first slash that is not enclosed in {}'s or ""'s; if found, a todo match is needed. The new parser handles the two types of matching together and so automatically detects the todo matches correctly. + Property names with -'s are not handled properly (cf. Note d) Specifically, the escapes are not removed. Example: (org-make-tags-matcher "PROP\\-WITH\\-HYPHENS=2") produces ("PROP\\-WITH\\-HYPHENS=2" and (progn (setq org-cached-props nil) (= (string-to-number (or (org-cached-entry-get nil "PROP\\-WITH\\-HYPHENS") "")) 2)) t) The original code /does/ instead remove -'s from tag names, which shouldn't have them anyway. I suspect that this was intended for property names rather than tag names. The new version fixes up property names but does not allow -'s in tags. + Incorrect comparison operators allowed (cf. Note e) The regular expression used is "[<=>]\\{1,2\\}" is used to detect the comparison operators. But this can produce bad matchers that fail opaquely at match time rather than giving an appropriate error message at parse time. Ex: (org-make-tags-matcher "P<<2") produces ("P<<2" and (progn (setq org-cached-props nil) (nil (string-to-number (or (org-cached-entry-get nil "P") "")) 2)) t) This is fixed in the new version and delivers an error message at parse time. + missing org-re (line 7179 in org.el) with posix classes Minor consistency issue. This line does not occur in the new code. Thanks and regards, Christopher Genovese On Sat, Aug 4, 2012 at 6:07 AM, Christopher Genovese wrote: > A small addendum: > > Right after I posted (of course!), I noticed both a small mistake and an > opportunity for > simplification, relating to detecting and processing the todo expressions > after a /. > Specifically, the approximate fix I proposed to the bug in the 7.8 code is > insufficient > to handle regexp matching in todo expressions. The full solution using the > new function org-find-todo-query is needed in the code as I have it, and > that can just > be plugged in instead of the string-match. (See Note h in the original > post, specifically > the string-match given there, and org-find-todo-query.) > > But I realized that all that is unnecessary as the todo processing can be > easily built > into the new parser. I've mostly done that just now and will test and post > an update > Saturday, er...today. > > Sorry to muddy the waters by not catching that earlier, and sorrier still > if I'm rambling. > Off to bed... > > -- Christopher > > > > On Sat, Aug 4, 2012 at 3:50 AM, Christopher Genovese wrote: > >> I am writing an application layer on top of org that uses the >> entry mapping API, but I needed both negation of complex >> selections and heading searches. Because the current tag query >> parser does not handle parenthesized expressions, it does not >> allow negating complex queries. At first, I wrote a workaround >> solution that mimics/specializes the mapping API, but that >> approach seemed inelegant and harder to maintain. >> >> So instead I implemented a full parser for tag queries with a >> number of useful features (see the labeled Notes at the bottom >> for further comments on these features): >> >> 1. Parenthesized expressions to arbitrary depth are allowed. >> 2. A '-' can be used to negate a parenthesized term. [Note >> a] >> 3. Regex's in {} can contain braces escaped by doubling: {{ }}. [Note >> b] >> 4. Supports fast property search on HEADING and PRIORITY. [Note >> c] >> 5. Handles hyphens in property names properly. [Note >> d,h] >> 6. Allows only the proper comparison operators, including ==. [Note >> e,h] >> 7. Allows spaces around operators and terms for readability. [Note >> f] >> 8. Matchers use the original expression order; not a big >> deal, but free. >> 9. The error messages during parsing are reasonably helpful. >> 10. Several bug fixes and a cleaner `org-make-tags-matcher'. [Note >> h] >> >> I'm submitting the code for your consideration, with the >> goal of eventually incorporating this into org.el. I would be >> happy to hear any comments or suggestions you have. As I'll describe >> below, this involves relatively minor changes to two existing >> functions and adding a few new support functions. I've attached two >> files org-tag-query-parse.el (the code) and tag-query-tests.el (a >> collection of tests built on a simple framework). I've also >> put the files in http://www.stat.cmu.edu/~genovese/emacs/. The >> comments in both files will I hope be helpful. >> >> At the risk of going on too long, I'd like to add a few comments >> about the code and tests. First, the two existing functions that >> are affected in the code are `org-make-tags-matcher' and >> `org-scan-tags'. In the new version of the former, I've extracted >> out both kinds of query parsing, leading to a shorter and cleaner >> function. The new version of the latter differs in only a couple >> *very minor* places that capture two values that were already >> being computed anyway (see the diff reproduced in the comments). >> Btw, I'm working from the 7.8.11 code. >> >> Loading org-tag-query-parse.el does not change the original >> functions. Instead, I've added a `-NEW' to the names of these >> functions and saved the originals also with a `-ORIGINAL' added. >> After loading the file, you can choose a version to try by doing >> >> (org-tmp-use-tag-parser 'new) >> and >> (org-tmp-use-tag-parser 'original) >> >> or do (org-tmp-use-tag-parser) to toggle between versions. >> You can also just use the names with suffixes directly. >> I'd also suggest byte-compiling the file. >> >> I think the place to start looking at the code is the new version >> of `org-make-tags-matcher'. The main entry function for the new >> parser is `org-tag-query-parse', though the real workhorse is >> actually the function `org-tag-query-parse-1'. There is also a >> new function `org-todo-query-parse' which just extracts the >> existing todo matching method. (I didn't do anything with that >> method as the manual makes it clear that it is of secondary >> importance.) I think the modularity here makes >> `org-make-tags-matcher' and each separate parser easier to read >> and understand. >> >> The other substantial piece (in terms of lines of code) is a utility >> macro `org-match-cond' that is used throughout and makes the main >> parser much more readable IMHO. Admittedly, I went a bit >> overboard in optimizing it; the first version worked fine >> but this one produces really nice code. I'd suggest ignoring this >> code (in section "Parsing utility for readable matchers") on >> first pass. The docstring is pretty complete, and its use is more >> or less self-explanatory. Most of its work is done at compile time. >> >> To run the tests, load org-tag-query-parse.el and tag-query-tests.el >> and do >> >> (tag-test-run :results) ; use :summary for a brief summary of all runs >> (tag-test-other-tests) ; miscellaneous other tests, including scanning >> >> or name individual suites. They are at the moment: >> >> (tag-test-run :results 'org-comparison-1) ; or use :summary >> (tag-test-run :results 'org-comparison-2) >> (tag-test-run :results 'match-results-1) >> (tag-test-run :results 'match-results-2) >> (tag-test-run :results 'should-error-1) >> >> If you have other ideas for tests or find any bugs, please let me >> know. Sorry for the homegrown framework; it just sort of grew and >> then I was too tired to rewrite the tests. One complication here >> is that the original and new algorithms produce different term >> orders and use a few different functions. The function >> tag-test-transform transforms original results to the new >> algorithms conventions, but it does not handle PRIORITY or >> HEADING matches at the moment. Use the tree form of the tess (see >> match-results-1 for example) on these. Btw, I've run the tests on >> GNU Emacs 23.2 and 24.1 (running on OS X lion). >> >> Notes: >> a. There is no need to introduce a new character such as ! for >> negation because the semantics of the - are clear and are >> consistent with its use for tags. A - binds more tightly >> than & which in turn binds more tightly than |. A + >> selector can also be used for positive selection of a >> parenthesized term but it is equivalent to using no >> selector, just as for tags. >> >> b. Because \'s are so heavily used in regex's and because they >> have to be doubled in strings, using \'s for an additional >> escape layer would be messy, ambiguous, and hard to read. >> Only the {}'s need to be escaped and the doubling escapes >> {{ -> { and }} -> } are simple, readable, and fast to >> parse. For example: "+{abc\\{{3,7\\}}}" gives the regex >> "abc\\{3,7\\}". Parity makes correctness clear at a glance. >> >> c. Because headline (and priority) searches can be useful and >> powerful, and because the information on those fields is >> *already processed* in `org-scan-tags', we get those >> special searches *essentially for free*, requiring only two >> minor changes to `org-scan-tags'. See the unified diff in >> comments. The special PRIORITY property already exists; I >> added the special HEADING property for these purposes. I'm >> open to changing the name of course, but I do think the >> feature is both useful and elegant. (I'm using it in my >> application, for instance.) >> >> d. I did not see it in the manual, but I think that property names >> with hyphens should have these \-escaped -'s in the query >> string, with the escaping slashes removed in the produced >> matcher. This is not currently done, but the new version does. >> See Note h for details. >> >> e. It seems desirable to support both = and == as equality operators >> since the latter is so common by habit. The new version allows >> this explicitly. The original version does as well, but the >> regex for the comparison operator also allows other operators >> <<, ><, >>, =>, and >= as well, which can produce bad matchers. >> See Note h for details. >> >> f. Currently, spaces are ignored around &, |, the implicit & between >> terms, around the comparison operators in property searches, >> and around +/- selectors. Spaces are not ignored inside {}'s >> for a regexp match. >> >> g. The current code also allows +/- selectors before property >> comparisons. I don't really like this because >> +PROP<>"something" and -PROP="something" have the same >> meaning but look very different. But the new code does >> support this. As a side note, there's really no need for >> the & characters as +/- serve the and/and-not function >> completely. But again, no prob. >> >> h. A few bugs detected in the 7.8.11 code: >> >> + Faulty test for todo matcher in org-make-tags-matcher >> (string-match "/+" match) >> >> Ex: (org-make-tags-matcher "PROP={^\\s-*// .*$}") produces >> an erroneous matcher: >> >> ("PROP={^\\s-*// .*$}" progn >> (setq org-cached-props nil) >> (member "PROP" tags-list)) >> >> For all practical purposes it will be enough to do: >> >> (string-match "\\(/\\(!\\)?\\s-*\\)[^{}\"]*$" match) >> >> instead of the current test in org-make-tags-matcher. >> This works as long as the TODO keywords do not contain a >> right brace or quotation marks. (In most other cases, the >> new parser should give an error message at parse time.) >> >> A technicality: this is /not/ a complete solution because >> arbitrary strings can be TODO keywords. For instance, >> both PROP={/!} and PROP="/!{/!}" are valid TODO keywords >> (it works!) *and* valid property comparisons. So, a pattern >> alone is insufficient. We want to find the first slash >> that is not enclosed in {}'s or ""'s; if found, a todo >> match is needed. The function `org-find-todo-query' does >> this and (org-find-todo-query match) can be plugged in >> directly replacing the above (string-match ...) in then >> new `org-make-tags-matcher'. >> >> But because the todo parsing uses {}'s for regex matches, >> TODO keywords with {}'s are ignored anyway. So there's >> no need to go beyond the fixed string-match above. >> The function `org-todo-query-parse', which handles todo >> parsing in the new version, makes this explicit. >> >> + Property names with -'s are not handled properly (cf. Note d) >> >> Specifically, the escapes are not removed. Example: >> (org-make-tags-matcher "PROP\\-WITH\\-HYPHENS=2") >> produces >> >> ("PROP\\-WITH\\-HYPHENS=2" and >> (progn >> (setq org-cached-props nil) >> (= >> (string-to-number >> (or (org-cached-entry-get nil "PROP\\-WITH\\-HYPHENS") >> "")) >> 2)) >> t) >> >> The original code /does/ instead remove -'s from tag >> names, which shouldn't have them anyway. I suspect that >> this was intended for property names rather than tag >> names. The new version fixes up property names but does >> not allow -'s in tags. >> >> + Incorrect comparison operators allowed (cf. Note e) >> >> The regular expression used is "[<=>]\\{1,2\\}" is used to >> detect the comparison operators. But this can produce bad >> matchers that fail opaquely at match time rather than >> giving an appropriate error message at parse time. >> >> Ex: (org-make-tags-matcher "P<<2") produces >> >> ("P<<2" and >> (progn >> (setq org-cached-props nil) >> (nil >> (string-to-number (or (org-cached-entry-get nil "P") "")) 2)) >> t) >> >> This is fixed in the new version and delivers an error >> message at parse time. >> >> + missing org-re (line 7179 in org.el) with posix classes >> >> Minor consistency issue. This line does not occur in the new >> code. >> >> >> Thanks and regards, >> >> Christopher Genovese >> >> >> > --047d7b2e4f6e94631204c674df36 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable I have attached an updated version of the files org-tag-query-parse.el
a= nd tag-query-tests.el that I posted about last night, and I have
updated= them at http://www.st= at.cmu.edu/~genovese/emacs/ as well. I've
also appended an updated version of my original note below for
reference= .

The issue had to do with the /!? todo-matches in the queries. The = bug in
the 7.8 code that I described in Note h of my original post had t= o do
with properly detecting when a /!? todo match is present. The
approximat= e fix I suggested was incorrect; the complete fix was
unnecessarily comp= licated. I realized all this a few minutes after the
post (d'oh) and= have now simplified things accordingly.

The new version unifies the parsing of both kinds of queries. I
elim= inated a few functions as a result, and the new org-make-tags-matcher
is= even simpler. As a result, todo matching deals with all those edge
cases correctly (like "PROP=3D{^.*//.*$}") for free, also allows = the {m,n}
construct in todo regexp matches, just like it does in the tag= matches.
(Braces are escaped by doubling, e.g. {^.*B{{1,7}}} as I menti= oned last
time.) All the tests pass in a fresh session, both with compiled and
non= -compiled code, on 23.2 and 24.1.

I'd appreciate any comments, s= uggestions, or other feedback you have
on all this.

Thanks for y= our patience,

=A0 Christopher


=3D=3D=3D Updated version of original post f= ollows for reference

I am writing an application layer on top of org that uses the
entry mapping API, but I = needed both negation of complex
selections and= heading searches. Because the current tag query
parser does not handle pa= renthesized expressions, it does not
allow neg= ating complex queries. At first, I wrote a workaround
solution that mimics/spec= ializes the mapping API, but that
approach see= med inelegant and harder to maintain.

So instead I implemented a full parser for tag queri= es with a
number of useful features (see the l= abeled Notes at the bottom
for further comments on t= hese features):

=A0 1. Parenthesized expressions to arbitrary depth are a= llowed.
=A0 2. A '-' can = be used to negate a parenthesized term.=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= [Note a]
=A0 3. Regex's in {} can contain= braces escaped by doubling: {{ }}.=A0 [Note b]
=A0 4. Supports fast prop= erty search on HEADING and PRIORITY.=A0=A0=A0=A0=A0=A0=A0 [Note c]=A0 5. Handles hyphens in property names properly.=A0= =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 [Note d,h]
=A0 6. Allows only the pr= oper comparison operators, including =3D=3D.=A0=A0=A0 [Note e,h]
=A0 7. Allows spaces around operators and terms for read= ability.=A0=A0=A0=A0 [Note f]
=A0 8. Matchers use the o= riginal expression order; not a big
=A0=A0=A0= =A0 deal, but free.
=A0 9. The error messages= during parsing are reasonably helpful.
=A0 10= . Several bug fixes and a cleaner `org-make-tags-matcher'.=A0=A0=A0=A0 = [Note h]

I'm submitting the code for your consideration, = with the
goal of eventually incorporating thi= s into org.el. I would
be happy to hear any comm= ents or suggestions you have. As
I'll desc= ribe below, this involves relatively minor changes
to two existing functions= and adding a few new support
functions. I'= ;ve attached two files org-tag-query-parse.el
(the code) and tag-query-= tests.el (a collection of tests
built on a sim= ple framework). I've also put the files in
http://www.stat.cmu.edu/~genovese/emacs/. T= he comments in
both files will I hope be helpf= ul.

At the risk of going on too long, I'd like to ad= d a few comments
about the code and tests. Fir= st, the two existing functions that
are affected in the code = are `org-make-tags-matcher' and
`org-scan-= tags'. In the new version of the former, I've unified
both kinds of query parsi= ng, leading to a shorter and cleaner
function.= . The new version of the latter differs in only a
couple *very minor* place= s that capture two values that were
already be= ing computed anyway (see the diff reproduced in the
comments). By the way, I&= #39;m working from the 7.8.11 code.

Loading org-tag-query-parse.el does = not change the original
functions. Instead, I'= ;ve added a `-NEW' to the names of these
f= unctions and saved the originals also with a `-ORIGINAL' added.<= br style=3D"font-family:courier new,monospace"> After loading the file, y= ou can choose a version to try by doing

=A0=A0=A0 (org-tmp-use-tag-parser= 'new)
and
=A0=A0=A0 (org-tmp-use-tag-parser 'original)

or do (org-tmp-use-tag-parser) to toggle between ver= sions.
You can also just use the names with su= ffixes directly.
I'd also suggest byte= -compiling the file.
=
I think the place to start looking at the code is th= e new
version of `org-make-tags= -matcher'. The main workhorse for the
new = parser is `org-tag-query-parse', with new function
`org-todo-query-parse'= ; handling the /!? todo parsing
at the appropr= iate point..

The other substantial piece (in terms of lines of co= de) is a
utility macro `org-match-cond' t= hat is used throughout and makes
the main parser much more= readable IMHO. Admittedly, I went a
bit overb= oard in optimizing it; the first version worked fine
but this one produces rea= lly nice code. I'd suggest ignoring
this c= ode (in section "Parsing utility for readable matchers") on first pass. The docstr= ing is pretty complete, and its use is
more or= less self-explanatory.

To run the tests, load org-tag-query-parse.el and ta= g-query-tests.el
and do

=A0=A0 (tag-test-run :results) ; use :summary for a = brief summary of all runs
=A0=A0 (tag-test-other-te= sts)=A0 ; miscellaneous other tests, including scanning

or name individual suites. They are at the moment:

=A0=A0 (tag-test-run :res= ults 'org-comparison-1)=A0 ; or use :summary
=A0=A0 (tag-test-run :results 'org-comparison-2)
=A0=A0 (tag-test-run :res= ults 'match-results-1)
=A0=A0 (tag-test-ru= n :results 'match-results-2)
=A0=A0 (tag-test-run :res= ults 'should-error-1)

If you have other ideas for tests or find any b= ugs, please let me
know. Sorry for the homeg= rown framework; it just sort of grew and
then = I was too tired to rewrite the tests. One complication here
is that the original and = new algorithms produce different term
orders a= nd use a few different functions. The function
tag-test-transform transf= orms original results to the new
algorithms co= nventions, but it does not handle PRIORITY or
HEADING matches at the mo= ment. Use the tree form of the tess (see
match= -results-1 for example) on these. Btw, I've run the tests on
GNU Emacs 23.2 and 24.1 (= running on OS X lion).

Notes:
=A0=A0 a. There is no nee= d to introduce a new character such as ! for
= =A0=A0=A0=A0=A0 negation because the semantics of the - are clear and are
=A0=A0=A0=A0=A0 consisten= t with its use for tags. A - binds more tightly
=A0=A0=A0=A0=A0 selector = can also be used for positive selection of a
= =A0=A0=A0=A0=A0 parenthesized term but it is equivalent to using no<= br style=3D"font-family:courier new,monospace"> =A0=A0=A0=A0=A0 selector,= just as for tags.
=A0=A0=A0=A0=A0
=A0=A0 b. Because \'s= are so heavily used in regex's and because they
=A0=A0=A0=A0=A0 have to be doubled in strings, using \'s for an = additional
=A0=A0=A0=A0=A0 escape la= yer would be messy, ambiguous, and hard to read.
=A0=A0=A0=A0=A0 Only the {}'s need to be escaped and the doubling es= capes
=A0=A0=A0=A0=A0 {{ -> = { and }} -> } are simple, readable, and fast to
=A0=A0=A0=A0=A0 parse. For example: "+{abc\\{{3,7\\}}}" give= s the regex
=A0=A0=A0=A0=A0 "abc= \\{3,7\\}". Parity makes correctness clear at a glance.
=A0=A0=A0=A0=A0
=A0=A0 c. Because headlin= e (and priority) searches can be useful and
= =A0=A0=A0=A0=A0 powerful, and because the information on those fields is
=A0=A0=A0=A0=A0 *already = processed* in `org-scan-tags', we get those
=A0=A0=A0=A0=A0 minor cha= nges to `org-scan-tags'. See the unified diff in
=A0=A0=A0=A0=A0 comments. The special PRIORITY property already exis= ts; I
=A0=A0=A0=A0=A0 added the= special HEADING property for these purposes. I'm
=A0=A0=A0=A0=A0 open to changing the name of course, but I do think= the
=A0=A0=A0=A0=A0 feature i= s both useful and elegant. (I'm using it in my
=A0=A0=A0=A0=A0 application, for instance.)

=A0=A0 d. I did not see it in the manual, but I thin= k that property names
=A0=A0=A0=A0=A0 with hyp= hens should have these \-escaped -'s in the query
=A0=A0=A0=A0=A0 string, w= ith the escaping slashes removed in the produced
=A0=A0=A0=A0=A0 matcher. This is not currently done, but the new version= does.
=A0=A0=A0=A0=A0 See Note = h for details.

=A0=A0 e. It seems desirable to support both =3D and =3D= =3D as equality operators
=A0=A0=A0=A0=A0 since the= latter is so common by habit. The new version allows
=A0=A0=A0=A0=A0 this explicitly. The original version does as well,= but the
=A0=A0=A0=A0=A0 regex for= the comparison operator also allows other operators
=A0=A0=A0=A0=A0 <<, ><, >>, =3D>, and >=3D a= s well, which can produce bad matchers.
=A0=A0=A0=A0=A0 See Note = h for details.

=A0=A0 f. Currently, spaces are ignored around &, |, t= he implicit & between
=A0=A0=A0=A0=A0 terms, ar= ound the comparison operators in property searches,
=A0=A0=A0=A0=A0 and around +/- selectors. Spaces are not ignored insi= de {}'s
=A0=A0=A0=A0=A0 for a reg= exp match.

=A0=A0 g. The current code also allows +/- selectors before p= roperty
=A0=A0=A0=A0=A0 compariso= ns. I don't really like this because
=A0= =A0=A0=A0=A0 +PROP<>"something" and -PROP=3D"something= " have the same
=A0=A0=A0=A0=A0 meaning b= ut look very different. But the new code does
= =A0=A0=A0=A0=A0 support this. As a side note, there's really no need fo= r
=A0=A0=A0=A0=A0 the &= characters as +/- serve the and/and-not function
=A0=A0=A0=A0=A0 completely. But again, no prob.

=A0=A0 h. A few bugs detected in the 7.8.11 code:

=A0=A0=A0=A0=A0 + Faulty = test for todo matcher in org-make-tags-matcher
=A0=A0=A0=A0=A0=A0=A0 (string-match "/+" match)

=A0=A0=A0=A0=A0=A0=A0 Ex: (org-make-tags-matcher &qu= ot;PROP=3D{^\\s-*// .*$}") produces
=A0=A0=A0=A0=A0=A0=A0 an = erroneous matcher:
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 ("PROP=3D{^\\s-= *// .*$}" progn
=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0=A0 (setq org-cached-props nil)
=A0= =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 (member "PROP" tags-list))

=A0=A0=A0=A0=A0=A0=A0 Because {}'s can appear in= /!? todo-match expressions, and
=A0=A0=A0=A0= =A0=A0=A0 becauseA arbitrary strings can be TODO keywords, a simple<= br style=3D"font-family:courier new,monospace"> =A0=A0=A0=A0=A0=A0=A0 pat= tern match will not give a complete solution. For
=A0=A0=A0=A0=A0=A0=A0 instance, both PROP=3D{/!} and PROP=3D"/!{/!= }" are valid TODO
=A0=A0=A0=A0=A0=A0=A0 key= words (it works!) *and* valid property comparisons. We
=A0=A0=A0=A0=A0=A0=A0 want to find the first slash that is not enc= losed in {}'s or
=A0=A0=A0=A0=A0=A0=A0 &qu= ot;"'s; if found, a todo match is needed. The new parser=A0=A0=A0=A0=A0=A0=A0 handles the two types of matching= together and so
=A0=A0=A0=A0=A0=A0=A0 aut= omatically detects the todo matches correctly.
=A0=A0=A0=A0=A0=A0=A0
=A0=A0=A0=A0=A0 + Propert= y names with -'s are not handled properly (cf. Note d)
=A0=A0=A0=A0=A0=A0=A0
=A0=A0=A0=A0=A0=A0=A0 Spe= cifically, the escapes are not removed. Example:
=A0=A0=A0=A0=A0=A0=A0 (org-make-tags-matcher "PROP\\-WITH\\-HYPHENS= =3D2")
=A0=A0=A0=A0=A0=A0=A0 pro= duces
=A0=A0=A0=A0=A0=A0=A0
=A0=A0=A0=A0=A0=A0=A0 (&q= uot;PROP\\-WITH\\-HYPHENS=3D2" and
=A0=A0= =A0=A0=A0=A0=A0=A0 (progn
=A0=A0=A0=A0=A0=A0=A0=A0 = (setq org-cached-props nil)
=A0=A0=A0=A0=A0=A0= =A0=A0 (=3D
=A0=A0=A0=A0=A0=A0=A0=A0= =A0 (string-to-number
=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0 (or (org-cached-entry-get nil "PROP\\-WITH\\-HYPHENS")
=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0 ""))
=A0=A0=A0=A0=A0=A0=A0=A0= =A0 2))
=A0=A0=A0=A0=A0=A0=A0=A0 = t)
=A0=A0=A0=A0=A0=A0=A0
=A0=A0=A0=A0=A0=A0=A0 The= original code /does/ instead remove -'s from tag
=A0=A0=A0=A0=A0=A0=A0 names, which shouldn't have them anyway. = I suspect that
=A0=A0=A0=A0=A0=A0=A0 thi= s was intended for property names rather than tag
=A0=A0=A0=A0=A0=A0=A0 names. The new version fixes up property names bu= t does
=A0=A0=A0=A0=A0=A0=A0 not= allow -'s in tags.

=A0=A0=A0=A0=A0 + Incorrect comparison operators = allowed (cf. Note e)
=A0=A0=A0=A0=A0=A0=A0
=A0=A0=A0=A0=A0=A0=A0 The regular expression use= d is "[<=3D>]\\{1,2\\}" is used to
=A0=A0=A0=A0=A0=A0=A0 det= ect the comparison operators. But this can produce bad
=A0=A0=A0=A0=A0=A0=A0 matchers that fail opaquely at match time ra= ther than
=A0=A0=A0=A0=A0=A0=A0 giv= ing an appropriate error message at parse time.

= =A0=A0=A0=A0=A0=A0=A0 Ex:= (org-make-tags-matcher "P<<2") produces

=A0=A0=A0=A0=A0=A0=A0=A0 ("P<<2" and=
=A0=A0=A0=A0=A0=A0=A0=A0=A0 (progn
=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0 (setq org-cached-props nil)
=A0=A0= =A0=A0=A0=A0=A0=A0=A0=A0=A0 (nil
=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0=A0 (string-to-number (or (org-cached-entry-get nil "P")= "")) 2))
<= span style=3D"font-family:courier new,monospace">=A0=A0=A0=A0=A0=A0=A0=A0= =A0 t)

=A0=A0=A0=A0=A0=A0=A0 This is fixed in the new versi= on and delivers an error
=A0=A0=A0=A0=A0=A0= =A0 message at parse time.

=A0=A0=A0=A0=A0 + missing org-re (line 7179 in org.e= l) with posix classes
=A0=A0=A0=A0=A0=A0=A0
=A0=A0=A0=A0=A0=A0=A0 Min= or consistency issue.=A0 This line does not occur in the new
=A0=A0=A0=A0=A0=A0=A0 code.


Than= ks and regards,

=A0=A0 Christopher Genove= se




On Sat= , Aug 4, 2012 at 6:07 AM, Christopher Genovese <genovese@cmu.edu> wrote:
A small addendum:

Right after I poste= d (of course!), I noticed both a small mistake and an opportunity for
si= mplification, relating to detecting and processing the todo expressions aft= er a /.
Specifically, the approximate fix I proposed to the bug in the 7.8 code is = insufficient
to handle regexp matching in todo expressions. The full solution using the<= br>new function org-find-todo-query is needed in the code as I have it, and= that can just
be plugged in instead of the string-match. (See Note h in= the original post, specifically
the string-match given there, and org-find-todo-query.)

But I reali= zed that all that is unnecessary as the todo processing can be easily built=
into the new parser. I've mostly done that just now and will test = and post an update
Saturday, er...today.

Sorry to muddy the waters by not catching tha= t earlier, and sorrier still if I'm rambling.=A0
Off to bed...

=A0-- Christopher<= /span>



On Sat, Aug 4, 201= 2 at 3:50 AM, Christopher Genovese <genovese@cmu.edu> wrote:<= br>
I am writing an application layer on top of org that uses the<= br style=3D"font-family:courier new,monospace"> entry mapping API, but I = needed both negation of complex
selections and heading se= arches. Because the current tag query
parser d= oes not handle parenthesized expressions, it does not
allow negating complex qu= eries. At first, I wrote a workaround
solution= that mimics/specializes the mapping API, but that
approach seemed inelegant= and harder to maintain.

So instead I implemented a full parser for tag q= ueries with a
number of useful features= (see the labeled Notes at the bottom
for furt= her comments on these features):

=A0 1. Parenthesized expressions to arbitrary depth = are allowed.
=A0 2. A '-' can be used = to negate a parenthesized term.=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 [Note a= ]
=A0 3. Regex's in {} = can contain braces escaped by doubling: {{ }}.=A0 [Note b]
=A0 4. Supports fast property search on HEADING and PRIORITY.= =A0=A0=A0=A0=A0=A0=A0 [Note c]
=A0 5. Handles hyphens in= property names properly.=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0 [Note d,h]
=A0 6. Allows only the prope= r comparison operators, including =3D=3D.=A0=A0=A0 [Note e,h]
=A0 7. Allows spaces arou= nd operators and terms for readability.=A0=A0=A0=A0 [Note f]
=A0 8. Matchers use the original expression order; not a big=
=A0=A0=A0=A0 deal, but fr= ee.
=A0 9. The error messages during parsing a= re reasonably helpful.
=A0 10. Several bug fixes= and a cleaner `org-make-tags-matcher'.=A0=A0=A0=A0 [Note h]

I'm submitting the co= de for your consideration, with the
goal of eventually incorporating th= is into org.el. I would be
happy to hear any comment= s or suggestions you have. As I'll describe
functions and adding a fe= w new support functions. I've attached two
files org-tag-query-parse.el (the code) and tag-query-tests.el (a collection of tests built= on a simple framework). I've also
put the= files in http://www.stat.cmu.edu/~genovese/emacs/. The
comments in both files wi= ll I hope be helpful.

At the risk of going on too long, I'd like to a= dd a few comments
about the code and tests.= First, the two existing functions that
are af= fected in the code are `org-make-tags-matcher' and
`org-scan-tags'. In t= he new version of the former, I've extracted
out both kinds of query parsing, leading to a shorter and cleaner=
function. The new version= of the latter differs in only a couple
*very = minor* places that capture two values that were already
being computed anyway (se= e the diff reproduced in the comments).
Btw, I= 'm working from the 7.8.11 code.

Loading org-tag-query-parse.el does not change the o= riginal
functions. Instead, I've added a= `-NEW' to the names of these
functions and saved the o= riginals also with a `-ORIGINAL' added.
Af= ter loading the file, you can choose a version to try by doing

=A0=A0=A0 (org-tmp-use-tag-parser 'new)and
=A0=A0=A0 (org-tmp-use-ta= g-parser 'original)

or do (org-tmp-use-tag-parser) to toggle between = versions.
You can also just use the= names with suffixes directly.
I'd also s= uggest byte-compiling the file.

I think the place to start looking at the code is th= e new version
of `org-make-tags-matcher'. = The main entry function for the new
parser is `org-tag-query-= parse', though the real workhorse is
actua= lly the function `org-tag-query-parse-1'. There is also a
new function `org-todo-qu= ery-parse' which just extracts the
existin= g todo matching method. (I didn't do anything with that
method as the manual make= s it clear that it is of secondary
importance.= ) I think the modularity here makes
`org-make-tags-matcher= 9; and each separate parser easier to read
and= understand.

The other substantial piece (in terms of lines of co= de) is a utility
macro `org-match-cond' th= at is used throughout and makes the main
parser much more readable= IMHO. Admittedly, I went a bit
overboard in o= ptimizing it; the first version worked fine
but this one produces rea= lly nice code. I'd suggest ignoring this
c= ode (in section "Parsing utility for readable matchers") on
first pass. The docstring= is pretty complete, and its use is more
or le= ss self-explanatory. Most of its work is done at compile time.

To run the tests, load org-tag-query-parse.el and ta= g-query-tests.el
and do

=A0=A0 (tag-test-run :results) ; use :summary for a = brief summary of all runs
=A0=A0 (tag-test-other-te= sts)=A0 ; miscellaneous other tests, including scanning

or name individual suites. They are at the moment:

=A0=A0 (tag-test-run :res= ults 'org-comparison-1)=A0 ; or use :summary
=A0=A0 (tag-test-run :results 'org-comparison-2)
=A0=A0 (tag-test-run :res= ults 'match-results-1)
=A0=A0 (tag-test-ru= n :results 'match-results-2)
=A0=A0 (tag-test-run :res= ults 'should-error-1)

If you have other ideas for tests or find any b= ugs, please let me
know. Sorry for the homeg= rown framework; it just sort of grew and
then = I was too tired to rewrite the tests. One complication here
is that the original and = new algorithms produce different term
orders a= nd use a few different functions. The function
tag-test-transform transf= orms original results to the new
algorithms co= nventions, but it does not handle PRIORITY or
HEADING matches at the mo= ment. Use the tree form of the tess (see
match= -results-1 for example) on these. Btw, I've run the tests on
GNU Emacs 23.2 and 24.1 (= running on OS X lion).

Notes:
=A0=A0 a. There is no nee= d to introduce a new character such as ! for
= =A0=A0=A0=A0=A0 negation because the semantics of the - are clear and are
=A0=A0=A0=A0=A0 consisten= t with its use for tags. A - binds more tightly
=A0=A0=A0=A0=A0 selector = can also be used for positive selection of a
= =A0=A0=A0=A0=A0 parenthesized term but it is equivalent to using no<= br style=3D"font-family:courier new,monospace"> =A0=A0=A0=A0=A0 selector,= just as for tags.
=A0=A0=A0=A0=A0
=A0=A0 b. Because \'s= are so heavily used in regex's and because they
=A0=A0=A0=A0=A0 have to be doubled in strings, using \'s for an = additional
=A0=A0=A0=A0=A0 escape la= yer would be messy, ambiguous, and hard to read.
=A0=A0=A0=A0=A0 Only the {}'s need to be escaped and the doubling es= capes
=A0=A0=A0=A0=A0 {{ -> = { and }} -> } are simple, readable, and fast to
=A0=A0=A0=A0=A0 parse. For example: "+{abc\\{{3,7\\}}}" give= s the regex
=A0=A0=A0=A0=A0 "abc= \\{3,7\\}". Parity makes correctness clear at a glance.
=A0=A0=A0=A0=A0
=A0=A0 c. Because headlin= e (and priority) searches can be useful and
= =A0=A0=A0=A0=A0 powerful, and because the information on those fields is
=A0=A0=A0=A0=A0 *already = processed* in `org-scan-tags', we get those
=A0=A0=A0=A0=A0 minor cha= nges to `org-scan-tags'. See the unified diff in
=A0=A0=A0=A0=A0 comments. The special PRIORITY property already exis= ts; I
=A0=A0=A0=A0=A0 added the= special HEADING property for these purposes. I'm
=A0=A0=A0=A0=A0 open to changing the name of course, but I do think= the
=A0=A0=A0=A0=A0 feature i= s both useful and elegant. (I'm using it in my
=A0=A0=A0=A0=A0 application, for instance.)

=A0=A0 d. I did not see it in the manual, but I thin= k that property names
=A0=A0=A0=A0=A0 with hyp= hens should have these \-escaped -'s in the query
=A0=A0=A0=A0=A0 string, w= ith the escaping slashes removed in the produced
=A0=A0=A0=A0=A0 matcher. This is not currently done, but the new version= does.
=A0=A0=A0=A0=A0 See Note = h for details.

=A0=A0 e. It seems desirable to support both =3D and =3D= =3D as equality operators
=A0=A0=A0=A0=A0 since the= latter is so common by habit. The new version allows
=A0=A0=A0=A0=A0 this explicitly. The original version does as well,= but the
=A0=A0=A0=A0=A0 regex for= the comparison operator also allows other operators
=A0=A0=A0=A0=A0 <<, ><, >>, =3D>, and >=3D a= s well, which can produce bad matchers.
=A0=A0=A0=A0=A0 See Note = h for details.

=A0=A0 f. Currently, spaces are ignored around &, |, t= he implicit & between
=A0=A0=A0=A0=A0 terms, ar= ound the comparison operators in property searches,
=A0=A0=A0=A0=A0 and around +/- selectors. Spaces are not ignored insi= de {}'s
=A0=A0=A0=A0=A0 for a reg= exp match.

=A0=A0 g. The current code also allows +/- selectors before p= roperty
=A0=A0=A0=A0=A0 compariso= ns. I don't really like this because
=A0= =A0=A0=A0=A0 +PROP<>"something" and -PROP=3D"something= " have the same
=A0=A0=A0=A0=A0 meaning b= ut look very different. But the new code does
= =A0=A0=A0=A0=A0 support this. As a side note, there's really no need fo= r
=A0=A0=A0=A0=A0 the &= characters as +/- serve the and/and-not function
=A0=A0=A0=A0=A0 completely. But again, no prob.

=A0=A0 h. A few bugs detected in the 7.8.11 code:

=A0=A0=A0=A0=A0 + Faulty = test for todo matcher in org-make-tags-matcher
=A0=A0=A0=A0=A0=A0=A0 (string-match "/+" match)

=A0=A0=A0=A0=A0=A0=A0 Ex: (org-make-tags-matcher &qu= ot;PROP=3D{^\\s-*// .*$}") produces
=A0=A0=A0=A0=A0=A0=A0 an = erroneous matcher:
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 ("PROP=3D{^\\s-= *// .*$}" progn
=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0=A0 (setq org-cached-props nil)
=A0= =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 (member "PROP" tags-list))

=A0=A0=A0=A0=A0=A0=A0 For all practical purposes it = will be enough to do:
=A0=A0=A0=A0=A0=A0=A0
=A0=A0=A0=A0=A0=A0=A0=A0 = (string-match "\\(/\\(!\\)?\\s-*\\)[^{}\"]*$" match)<= br style=3D"font-family:courier new,monospace">=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0
=A0=A0=A0=A0=A0=A0=A0 ins= tead of the current test in org-make-tags-matcher.
=A0=A0=A0=A0=A0=A0=A0 This works as long as the TODO keywords do not c= ontain a
=A0=A0=A0=A0=A0=A0=A0 rig= ht brace or quotation marks. (In most other cases, the
=A0=A0=A0=A0=A0=A0=A0 new parser should give an error message at p= arse time.)
=A0=A0=A0=A0=A0=A0=A0
=A0=A0=A0=A0=A0=A0=A0 A technicality: this is /n= ot/ a complete solution because
=A0=A0=A0=A0=A0=A0=A0 arb= itrary strings can be TODO keywords. For instance,
=A0=A0=A0=A0=A0=A0=A0 both PROP=3D{/!} and PROP=3D"/!{/!}" a= re valid TODO keywords
=A0=A0=A0=A0=A0=A0=A0 (it= works!) *and* valid property comparisons. So, a pattern
=A0=A0=A0=A0=A0=A0=A0 alone is insufficient. We want to find the= first slash
=A0=A0=A0=A0=A0=A0=A0 tha= t is not enclosed in {}'s or ""'s; if found, a todo
=A0=A0=A0=A0=A0=A0=A0 match is needed. The function= `org-find-todo-query' does
=A0=A0=A0=A0=A0=A0=A0 thi= s and (org-find-todo-query match) can be plugged in
=A0=A0=A0=A0=A0=A0=A0 directly replacing the above (string-match ...)= in then
=A0=A0=A0=A0=A0=A0=A0 new= `org-make-tags-matcher'.
=A0=A0=A0=A0=A0= =A0=A0
=A0=A0=A0=A0=A0=A0=A0 But= because the todo parsing uses {}'s for regex matches,
=A0=A0=A0=A0=A0=A0=A0 TODO keywords with {}'s are ignored= anyway. So there's
=A0=A0=A0=A0=A0=A0=A0 no = need to go beyond the fixed string-match above.
=A0=A0=A0=A0=A0=A0=A0 par= sing in the new version, makes this explicit.
= =A0=A0=A0=A0=A0=A0=A0
=A0=A0=A0=A0=A0 + Propert= y names with -'s are not handled properly (cf. Note d)
=A0=A0=A0=A0=A0=A0=A0
=A0=A0=A0=A0=A0=A0=A0 Spe= cifically, the escapes are not removed. Example:
=A0=A0=A0=A0=A0=A0=A0 (org-make-tags-matcher "PROP\\-WITH\\-HYPHENS= =3D2")
=A0=A0=A0=A0=A0=A0=A0 pro= duces
=A0=A0=A0=A0=A0=A0=A0
=A0=A0=A0=A0=A0=A0=A0 (&q= uot;PROP\\-WITH\\-HYPHENS=3D2" and
=A0=A0= =A0=A0=A0=A0=A0=A0 (progn
=A0=A0=A0=A0=A0=A0=A0=A0 = (setq org-cached-props nil)
=A0=A0=A0=A0=A0=A0= =A0=A0 (=3D
=A0=A0=A0=A0=A0=A0=A0=A0= =A0 (string-to-number
=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0 (or (org-cached-entry-get nil "PROP\\-WITH\\-HYPHENS")
=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0 ""))
=A0=A0=A0=A0=A0=A0=A0=A0= =A0 2))
=A0=A0=A0=A0=A0=A0=A0=A0 = t)
=A0=A0=A0=A0=A0=A0=A0
=A0=A0=A0=A0=A0=A0=A0 The= original code /does/ instead remove -'s from tag
=A0=A0=A0=A0=A0=A0=A0 names, which shouldn't have them anyway. = I suspect that
=A0=A0=A0=A0=A0=A0=A0 thi= s was intended for property names rather than tag
=A0=A0=A0=A0=A0=A0=A0 names. The new version fixes up property names bu= t does
=A0=A0=A0=A0=A0=A0=A0 not= allow -'s in tags.

=A0=A0=A0=A0=A0 + Incorrect comparison operators = allowed (cf. Note e)
=A0=A0=A0=A0=A0=A0=A0
=A0=A0=A0=A0=A0=A0=A0 The regular expression use= d is "[<=3D>]\\{1,2\\}" is used to
=A0=A0=A0=A0=A0=A0=A0 det= ect the comparison operators. But this can produce bad
=A0=A0=A0=A0=A0=A0=A0 matchers that fail opaquely at match time ra= ther than
=A0=A0=A0=A0=A0=A0=A0 giv= ing an appropriate error message at parse time.

= =A0=A0=A0=A0=A0=A0=A0 Ex:= (org-make-tags-matcher "P<<2") produces

=A0=A0=A0=A0=A0=A0=A0=A0 ("P<<2" and=
=A0=A0=A0=A0=A0=A0=A0=A0=A0 (progn
=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0 (setq org-cached-props nil)
=A0=A0= =A0=A0=A0=A0=A0=A0=A0=A0=A0 (nil
=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0=A0 (string-to-number (or (org-cached-entry-get nil "P")= "")) 2))
<= span style=3D"font-family:courier new,monospace">=A0=A0=A0=A0=A0=A0=A0=A0= =A0 t)

=A0=A0=A0=A0=A0=A0=A0 This is fixed in the new versi= on and delivers an error
=A0=A0=A0=A0=A0=A0= =A0 message at parse time.

=A0=A0=A0=A0=A0 + missing org-re (line 7179 in org.e= l) with posix classes
=A0=A0=A0=A0=A0=A0=A0
=A0=A0=A0=A0=A0=A0=A0 Min= or consistency issue.=A0 This line does not occur in the new
=A0=A0=A0=A0=A0=A0=A0 code.


Than= ks and regards,

=A0=A0 Christopher Genove= se




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