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480 Commits

Author SHA1 Message Date
Robby Findler
160fcacad6 redex: fix bug introduced in recent optimization attempts 2012-01-02 22:21:21 -06:00
Robby Findler
83758881c3 Don't attempt to drop duplicates in the non-terminal case 
This speeds up the lambdajs model considerably because the computation
to determine duplicates is expensive and no duplicates are really
ever dropped (and, in general, I think that duplicates will only
be dropped when the grammar is ambiguous; so maybe a better thing
is to just rewrite the grammar when that happens)
 2012-01-02 10:08:34 -06:00
Robby Findler
6bf42855b8 adjust plug to be parsimonious and actually shortcircuit 
when one hole has been found

This improves the lambdajs model example's running time, presumably
because the hole is generally found near the "beginning" of the
term
 2012-01-02 10:08:33 -06:00
Robby Findler
5dcbedc768 redex: adjust the caching strategy 
Instead of using a hash-table, use the equal-hash-code directly;
this lets me evict entries only when they clobber each other,
and generally keep good cache utilization.

Also, cut the cache size by a factor of 5 while still having a
slight performance improvement on the r6rs test suite benchmark.
On that same benchmark, there are 1714812 misses in the cache, but
only 3485 times is an entry in the cache clobbered
 2012-01-02 10:08:31 -06:00
Robby Findler
a6a01fd7b8 redex: fix arity-1 cache key computation 2012-01-02 10:08:31 -06:00
Robby Findler
a7a70cbca9 redex: improved the definitely-not-list definitely-not-non-list 
computation to be more accurate
 2012-01-02 10:08:30 -06:00
Robby Findler
fe1df742b3 Tried to improve redex by detecting when a pattern does not 
have any holes, hide-holes, or names and, in that case, just
combining booleans instead of building of mtch structs.

This does seem to work on a simple benchmark. The code below
gets about 6x faster. But on the r6rs test suite, there is
no substantial change (possibly because the caching obviates
this optimization?)

lang racket/base
(require redex/reduction-semantics)
(caching-enabled? #f)
(define-language L (e (+ e e) number))
(define t
  (let loop ([n 100])
    (cond
      [(zero? n) 1]
      [else `(+ 11 ,(loop (- n 1)))])))
(define f (redex-match L e))
(time (for ([x (in-range 1000)]) (f t)))
 2012-01-02 10:08:29 -06:00
Robby Findler
6f97a3a783 disable attempt at Jay's optimization 
When I enabled this, I don't see any speedup, on the R6RS test suite
benchmark (I see minor slowdown). Here are the numbers I get, on my
laptop:

   nt cache:  35537 msec
    neither: 844933 msec
 Jay's idea: 875306 msec

And with both on, I see a similar, minor slowdown (as compared to the
version with the nt cache).

The main difference seems to be that I'm getting about 6 "hits" per
test case on the nt-match structs (that is, I avoid work by finding an
nt-match struct) and I'm getting about 8,800 hits in the cache per
test case.
 2012-01-02 10:08:29 -06:00
Robby Findler
424a535cf4 first attempt at Jay's optimization for redex 
(only did enough to get the r6rs tests running)
 2012-01-02 10:08:28 -06:00
Robby Findler
4c86e2fe86 redex: memoize only the non-terminal patterns 
remarkably, this seems to cut the time for running
the r6rs test suite in about 1/2
 2011-12-29 11:01:21 -06:00
Robby Findler
57f51cf5c8 redex: use predicate/c instead of (-> any/c boolean?) 
and a few other, minor changes
 2011-12-29 10:58:26 -06:00
Robby Findler
d6ce2b61bc redex: inline lookup-binding 2011-12-29 10:32:02 -06:00
Robby Findler
9bcb86eb0c redex: minor cleanup 2011-12-29 10:15:52 -06:00
Robby Findler
5b2d378a77 fixed a bug in recent Redex internal pattern rewrite 
(discovered by the random testing done for the racket machine model)
 2011-12-28 23:52:56 -06:00
Robby Findler
f1bacffbdc Adjusted rewrite-side-condition/check-errs so that it normalizes the internal 
redex patterns a bunch:

- repeats are turned into wrappers in sequences,
- names are all explicit,
- non-terminals are wrapped with `nt',
- cross patterns always have the hyphens in them.
- ellipses names are normalized (so there are no "hidden"
  name equalities); this also means that repeat patterns
  can have both a regular name and a mismatch name

Also, added a match-a-pattern helper macro that checks to make sure
that functions that process patterns don't miss any cases
 2011-12-28 09:46:43 -06:00
Robby Findler
a88d9ca116 missed a place to add an undatum 2011-12-15 08:44:39 -06:00
Robby Findler
c91d004729 more cleanup of the rendering for the case when (format "~s" x) 
and (format "~a" x) are different (when 'x' is a symbol)
 2011-12-15 08:44:39 -06:00
Matthew Flatt
25dd8727cb add datum-case', etc. as syntax/datum' 
This library is used by Redex, which wants a `syntax'-like template
language, but for datum values instead of syntax objects. Using
`datum-case' and `datum' generates much less code. Redex uses
only a small part of the general functionality, so adding
`syntax/datum' could be overkill. It's implemented by generalizing
the `syntax-case' and `syntax' pattern matching and template
constructing code, though; it's not a lot of extra code, and it's
easiest to generalize completely. We may find other uses for
datum templates, too.
 2011-12-12 08:13:20 -07:00
Robby Findler
622bec0719 avoid (format "~s" x) in favor of (symbol->string x) for symbols 
when doing typesetting stuff in Redex, as the former seems to have
some kind of context dependency that makes it insert ||s around
some upper-case symbols sometimes
 2011-12-10 02:55:47 -06:00
Robby Findler
e55ed2dc25 improve syntax error reporting for judgment-holds in reduction relations (and 
probably elsewhere)
 2011-12-08 20:35:46 -06:00
Robby Findler
447bd44a0c minor rackety 2011-12-05 01:14:54 -06:00
Robby Findler
f725066bf9 fix bug in the handling of side-conditions 2011-12-05 01:14:54 -06:00
Robby Findler
ce7523f01f more atoms can be shared now, so wrap 'em up 2011-12-02 16:38:56 -06:00
Robby Findler
458e2c2282 some long overdue Rackety: renaming the 'scheme:' exports of the framework to 'racket:' 2011-11-30 06:45:50 -06:00
Robby Findler
9db206b231 add in keymap mixin 2011-11-29 18:43:37 -06:00
Robby Findler
e788c6f49e adjust define-judgment-form so that it 
a) avoids creating big intermediate lists of the same things over and over
   (this closes PR 12380)
b) generates less code (by generating calls to local functions)
c) normalizes its output (sorts by the printed representation)
 2011-11-20 22:50:07 -06:00
Robby Findler
0a75219438 added support for where & side-condition & judgment-holds to define-relation 
closes PR 12382
 2011-11-20 21:34:22 -06:00
Robby Findler
b93486ed69 compile the left-hand sides of define-judgment only once, not during each time we try to check a judgment 
related to PR 12380
 2011-11-17 20:55:05 -06:00
Robby Findler
755dc28e55 Fixes define-relation's handling of ellipses across clauses 
closes PR 12378
 2011-11-17 17:00:11 -06:00
Robby Findler
3379fb8df6 fix some redex bugs caught by drdr tests 2011-11-09 06:47:38 -06:00
Robby Findler
0ce6c75591 Rackety (mostly letrec-values => define and minimizing dependencies) 2011-10-31 09:14:34 -05:00
Robby Findler
64dfdb3c7f Change the expansion of reduction-relation so that it generates less code 
(by expanding into a call to a 30 or so line procedure, instead of putting
that code directly into the result of the macro).

This produces about a 6x speedup on this reduction-relation

  (reduction-relation L (--> 0 1) (--> 1 2) ... (--> 99 100))

where L is

  (define-language L)

The time it takes to run "racket r6rs.rkt" in the shell from the
directory collects/redex/examples/r6rs speeds up by about 10% (15%
with errortrace enabled), in the case where all .zo files are built,
except the ones in the r6rs directory. (Also worth noting that "racket
-l redex" takes more than 50% of that time.) And the change has no
noticeable effect on the time it takes to run r6rs-test.rkt.
 2011-10-31 08:53:09 -05:00
Robby Findler
41f68af64a delay the construction of the compatible-closure grammar (the 'cross' thing) 
until it is actually used. (This can make a big difference for large grammars
in models that don't actually use the compatible closure stuff.)
 2011-10-30 22:36:53 -05:00
Robby Findler
9d371153fd add the #:stop-when argument to apply-reduction-relation* 2011-10-23 12:10:56 -05:00
Casey Klein
57a8ed5c79 Fixes matching of prefab struct literals 
Fixes PR 12298
 2011-10-17 19:37:16 -05:00
Robby Findler
9ab6a93127 fix the error check 
closes PR 12290
 2011-10-15 14:00:16 -05:00
Robby Findler
db2e13a09b add a "Step Until Choice" option into the redex stepper 2011-10-14 13:37:12 -05:00
Ryan Culpepper
7cc1476170 syntax/parse: fix bug: integrated stxclass might not bind pvar to syntax 2011-09-21 16:58:52 -06:00
Casey Klein
634f5c9e0c Removes now outdated comment 2011-09-08 09:11:52 -05:00
Casey Klein
97e792200f Gives a function a better name 2011-09-08 09:11:52 -05:00
Casey Klein
6d43376f9c Adds support for `judgment-holds' clauses in metafunctions 2011-09-08 09:11:52 -05:00
Casey Klein
ac7856a377 Moves metafunction construction to later expansion step 2011-09-08 09:11:51 -05:00
Casey Klein
2b4f604776 Replaces use of `define-syntax-set' 2011-09-08 09:11:51 -05:00
Casey Klein
145828527f Fixes handling of pattern variables that look like metafunctions 2011-08-31 11:20:02 -05:00
Casey Klein
c0625dc30c Adds define-term form 2011-08-30 15:10:50 -05:00
Eli Barzilay
1db5ad97f8 Fix another bunch of "language" typos. 2011-08-26 05:26:46 -04:00
Casey Klein
2eced78000 Fixes indentation 2011-08-17 11:59:43 -05:00
Casey Klein
9e2e11e9c4 Tests metafunction Check Syntax arrows 2011-08-16 14:32:33 -05:00
Casey Klein
98eaaebc65 Improves error messages for Redex definition forms 2011-08-15 12:46:14 -05:00
Casey Klein
4d1651645a Improves error message for premise typos 2011-08-10 12:24:02 -05:00
Casey Klein
a2dc2d9540 Fixes arity checks outside define-judgment-form 2011-08-10 12:24:02 -05:00
Casey Klein
87f3541979 Adds support for ellipsis-repeated premises 2011-08-10 12:24:01 -05:00
Casey Klein
88cd7cd303 Adds with-compound-rewriters typesetting form 2011-08-10 12:24:00 -05:00
Casey Klein
52c50dd67e Adds an alternative syntax for define-judgment-form rules 
The conclusion may come last instead of first when a sequence of
dashes precedes it.
 2011-08-10 12:24:00 -05:00
Casey Klein
dbfbf59256 Changes syntax for define-judgment-form mode and contract specs 2011-08-10 12:23:59 -05:00
Casey Klein
d58a743b89 Fixes define-judgment-form at the top-level with errortrace enabled 2011-08-10 12:23:59 -05:00
Casey Klein
576272362b Adds define-judgment-form form 2011-08-05 07:19:23 -05:00
Casey Klein
8887ea2ef3 Refactors meta-function implementation further 2011-08-05 07:19:22 -05:00
Casey Klein
6e38233286 Deletes dead code 2011-08-05 07:19:22 -05:00
Casey Klein
7898018cad Factors out name-consistency check 2011-08-05 07:19:22 -05:00
Casey Klein
24dc005ff4 Removes special case for typesetting recursive calls 
This case doesn't appear necessary, since LWs are constructed in an
expansion step that occurs after all of the meta-function names
(including the current one) are bound.
 2011-08-05 07:19:21 -05:00
Casey Klein
3dc677d270 Factors out parsing of relation contracts 2011-08-05 07:19:21 -05:00
Casey Klein
c9c2bb8ad7 Refactors construction of meta-function and relation lws 2011-08-05 07:19:20 -05:00
Eli Barzilay
3157955d40 ".ss" -> ".rkt" scan done. 2011-07-02 10:37:53 -04:00
Eli Barzilay
40124a0619 A long overdue scan to eliminate files without terminating newlines. 
(DrRacket should really do that.)
 2011-06-28 02:01:41 -04:00
Robby Findler
78006b5720 redex: adjust the 'horizontal rule-pict-style so that it doesn't add space after the last rule 
extend render-reduction-relation-rules so you can specify rule indicies instead of just
         the names of the rules
 2011-06-21 06:32:51 +08:00
Robby Findler
b43e956c7b Redex: added to-lw/stx 
plus improved the redex docs slightly and Rackety
 2011-05-30 21:33:55 -05:00
Robby Findler
d74810a08b fix broken earlier commit 2011-05-25 14:57:04 -05:00
Robby Findler
33e68022db make the two-argument version of redex-match use the right name for the procedure it returns 2011-05-25 12:45:06 -05:00
Casey Klein
e8e2898359 Fixes rendering of relations with `name' patterns 2011-05-24 11:58:54 -05:00
Robby Findler
040bd371b6 adjust the lw construction in Redex so that it uses the width of the 
"canonical" way to write symbols, instead of the way they are displayed.
This makes a difference for symbols that have spaces in them or symbols
that, when displayed, look like numbers or other non-symbol things.
 2011-05-20 21:52:09 -05:00
Robby Findler
c163e75023 make the generated name used for languages (introduced by define-language 
and define-extended-language) be based on the name of the language so the
error message is better (but not as good as it should be)
 2011-05-11 18:38:10 -05:00
Casey Klein
cafcb47549 Refactored reduction-relation-procs 2011-05-08 06:19:45 -05:00
Casey Klein
dd58b457a9 Fixes domain checking of unioned reduction relations 2011-05-08 05:04:16 -05:00
Robby Findler
33c848fcda added current-cache-all?, a parameter that controls the caching strategy 
that apply-reduction-relation* (and thus test-->>) uses
also make apply-reduction-relation* call remove-duplicates
  on the result of apply-reduction-relation
 2011-05-07 20:06:38 -05:00
Casey Klein
4b03ddccb1 Fixes Redex stepper's handling of symbols quoted with || 2011-05-04 10:34:01 -05:00
Robby Findler
8fbefb0b6d added typesetting support for relations 2011-04-28 22:20:14 -05:00
Casey Klein
1d1cdd03f5 Adds a form like term-let but using Redex patterns 2011-04-26 12:13:17 -05:00
Casey Klein
b3f45d3c84 Refactors to eliminate copied code 2011-04-26 12:13:17 -05:00
Casey Klein
50f14dea18 Adds start term to test-->>E failure message 
Closes PR 11867
 2011-04-22 09:49:41 -05:00
Casey Klein
1c8c6ddbee Adds generate-term option for LHS-based generation 2011-04-22 04:43:11 -05:00
Casey Klein
362a6d75a5 Changes redex-match to suppress ..._x bindings 2011-04-22 04:43:11 -05:00
Casey Klein
0b9db752ca Fixes test-->>E failure message 
Fixes PR 11853
 2011-04-15 04:52:13 -05:00
Casey Klein
46b3a9d13d Fixes generation of any' within in-hole' context position 2011-04-14 18:32:06 -05:00
Casey Klein
319ae5f825 Deletes code that should have been deleted when named holes went away 2011-04-14 18:32:05 -05:00
Casey Klein
989103c3a1 Improves term-let's "too few ellipses" error 
Fixes PR 10837
 2011-04-07 13:17:15 -05:00
Casey Klein
143e1e66fd Improves error for references to not-yet-defined metafunctions 
Fixes PR 11041
 2011-04-07 13:17:15 -05:00
Ryan Culpepper
73ab167522 created racket/syntax from parts of unstable/syntax 2011-04-07 09:47:20 -06:00
Casey Klein
1ad2b1b938 Makes cross' work better with hide-hole' 
Fixes PR 11579
 2011-04-06 10:17:15 -05:00
Casey Klein
e8130a2fd1 Fixes bug in `cross' pattern handling 2011-04-06 10:17:15 -05:00
Casey Klein
a4644d4d49 Disallows unquote in Redex patterns 
Fixes PR 11296
 2011-04-01 14:00:45 -05:00
Casey Klein
d97a2b505c Fixes matching of ..._x and ..._!_x inside ellipses 2011-03-30 10:15:17 -05:00
Casey Klein
b958e21f46 Fixes another bug in the stepper's diff highlighting 2011-03-29 13:05:03 -05:00
Casey Klein
df3bc8980b Fixes a bug in the stepper's diff highlighting 2011-03-29 13:05:02 -05:00
Robby Findler
7a427be2fd improve Redex's arrow drawing 2011-03-27 14:49:34 -05:00
Robby Findler
f69ff3b6b7 added support for 'or', \vee, and \cup as builtins to the define-metafunction codomain contracts 2011-03-26 10:04:39 -05:00
Casey Klein
3214861420 Fixes rendering of (hole t ...+) 
There was some old named holes code still in use.
 2011-03-24 14:35:02 -05:00
Robby Findler
99e9bd9543 exported arrow->pict 2011-03-23 17:03:57 -05:00
Casey Klein
87934752b5 Adds a parameter that provides a default for redex-check's #:attempt argument 2011-03-22 21:20:29 -05:00
Robby Findler
d0d2285c4c Adjust the dependencies in redex/pict so it doesn't depend on racket/gui/base anymore 2011-03-17 13:35:32 -05:00
David Van Horn
760a58b65d Fixes more spelling errors. 2011-02-04 19:44:13 -07:00
Casey Klein
f7fd6ee689 Changes the term generator to produce shorter sequences 
It now uses the (local) size bound instead of the (global) attempt count.
 2011-01-31 12:36:42 -06:00
Casey Klein
b45bb829b6 Fixes a bug in metafunction traces 
When the result is in the cache but the cache is not consulted because
`caching-enabled?' is false, the call should not be shown as cached.
 2011-01-14 13:41:09 -06:00
Casey Klein
61607c4da1 Adds a check to the define/extend language parser 2011-01-14 13:41:09 -06:00
Casey Klein
3c2e2fc362 Fixes `extend-reduction-relation' bug. 
The #:domain argument did not apply to inherited rules.
 2011-01-14 13:41:09 -06:00
Casey Klein
56a548c517 Suppresses overridden rules in the names reported for a reduction relation 2011-01-14 13:41:09 -06:00
Casey Klein
25c1400d8b Exposes the default value of the #:attempt-size argument 2011-01-03 09:37:32 -06:00
Casey Klein
de8b1bc101 Fixes a bug in the generation of `side-condition' patterns 
The bindings supplied to `side-condition' predicates by the matcher
sometimes contain the-not-hole; the ones supplied by the generator
must be the same.
 2010-12-31 15:34:31 -06:00
Robby Findler
eb29b17112 adds a #:pred argument to test-->> (in rough analogy to the #:pred argument on traces) 2010-12-20 22:09:10 -06:00
Casey Klein
7243029786 Fixes a bug in the Redex term generator 2010-12-10 13:58:11 -06:00
Casey Klein
9ea976625d Steven's progress on the compiler 2010-12-06 14:44:38 -06:00
Casey Klein
8affb5b13f Fixes CS renaming of pattern occurrences of metafunction names 2010-12-03 15:47:54 -06:00
Casey Klein
c3f0052eac Deletes incorrect comment. 2010-12-02 15:54:47 -06:00
Casey Klein
2a8fdd9646 Adjusts typesetting to account for gr2 rendering of filled rectangles 2010-12-02 15:54:46 -06:00
Casey Klein
8ff358b559 Abstracts randomized testing forms over the underlying PRG 2010-11-26 13:02:14 -06:00
Casey Klein
d927bc117e Fixes the bug with named contexts in a better way 2010-11-26 13:02:14 -06:00
Casey Klein
1147318426 Fixes bug with `in-hole' generation 2010-11-26 13:02:14 -06:00
Casey Klein
ae164d281b Adds optional `::=' keyword to language definition forms 2010-11-09 10:14:50 -06:00
Robby Findler
38b9b25ae0 redex: added indication of caching for metafunction tracing 2010-11-07 15:31:18 -06:00
Casey Klein
743ccafd15 Improves the error reporting and documentation for `define-relation' 2010-11-05 08:59:46 -05:00
Casey Klein
df810e8e10 Closes PR 11383 2010-11-04 17:31:35 -05:00
Robby Findler
8bf096b1e3 added contracts to define-relation. 
(also removed old, wrong tl-pat stuff from the docs)
 2010-11-04 17:29:14 -05:00
Casey Klein
f9b64fa2b8 Removes `apply-reduction-relation*' trie experiment 2010-10-31 17:28:19 -05:00
Casey Klein
4542d071d5 Adds the `test-->>∃' form. 2010-10-28 20:22:35 -05:00
Casey Klein
4577de0790 Fixes PR 11336. 2010-10-20 15:56:57 -07:00
Casey Klein
42687d26d1 Reverts most of push #21257. 
That push recompiles a clause of an extended metafunction by
replacing the LHS with a recompiled form of the `lhs-pat' field of the
`metafunc-case' struct. But that field (used by the test generator)
also incorporates the clause's `where' and `side-condition' clauses,
causing them to executed twice when applying the recompiled clause (once
while matching its LHS, and once while evaluating its RHS).
 2010-10-20 15:56:57 -07:00
Robby Findler
5c94ca5b7c idle attempts to reduce allocation in the matcher 2010-10-19 18:41:19 -05:00
Robby Findler
99d85159b6 adjusted define-metafunction/extension so that it recompiles the old cases in the new language 2010-10-16 16:29:15 -05:00
Robby Findler
2652237559 fixed a bug in extended languages & the _ check 2010-10-13 17:44:19 -05:00
Steven Jaconette
9a4b2d2023 fixed a bug uncovered by a stronger syntactic check in redex 2010-10-04 11:24:36 -05:00
Robby Findler
c1285b12ed added checks to make ellipses appearing at different depths be a syntax error 2010-10-01 18:09:02 -05:00
Robby Findler
1f8bbf43a7 fixed pb-last-column-visible so the stepper now shows the last column when you click the '->' (next) button 2010-09-26 22:47:36 -05:00
Robby Findler
a6dea9b85c removed current-pretty-printer (it was never released and it is 
superceded by pretty-print-parameters).
 2010-09-26 22:47:35 -05:00
Robby Findler
f87aa7ec61 added pretty-print-parameters to control how pretty printing happens for terms 2010-09-26 22:47:35 -05:00
Robby Findler
273e6e7d25 added paren-style 
added missing provide for grammar-style
removed some dead code
 2010-09-24 19:34:32 -05:00
Robby Findler
d4c68e7359 added grammar-style for the ::= and | in grammars in redex typesetting 2010-09-21 15:08:12 -05:00
Eli Barzilay
ee138cf2cb Some repeated "and and"s and "the the"s, and two more typos. 
Closes PR 11229.
 2010-09-20 15:38:18 -04:00
Steven Jaconette
7169c0e53e Second patch for redex compiler 
-Fixes some bugs in the model
-Cleans up some unused code
-Adds the test cases
 2010-09-20 10:04:50 -05:00
Casey Klein
17ac1fae3a Adds a parameter to enable the typesetting in commit ce211ac 2010-09-17 13:43:06 -05:00
Robby Findler
ce211ac364 adjusted metafunction application rendering so that ellipses do not 
get commas put in front of them
 2010-09-17 11:39:07 -05:00
Robby Findler
b8fc5fcfce Rackety 2010-09-16 13:37:34 -05:00
Robby Findler
28a253b206 added current-pretty-printer 2010-09-16 13:37:33 -05:00
Robby Findler
d03a7b220a added docs for linebreaks parameter 
Adjusted implementation of linebreaking so that
  when there are linebreaks in a metafunction, the =
  signs line up together independent of the broken lines
 2010-09-16 10:51:17 -05:00
Casey Klein
14ceb68b92 Adds functions for testing pattern compiler 2010-09-08 14:12:47 -05:00
Steven Jaconette
f5482e5703 Initial compiler model (includes low level pattern language model and redex to low level lanaguage compiler) 2010-09-08 14:12:47 -05:00
Robby Findler
4d8cc1bc51 dont use the black-on-white preferences for redex's stepper 2010-08-31 07:33:13 -05:00
Casey Klein
fbd2c3c86f Adds the feature requested in PR 10388 2010-08-18 13:19:12 -05:00
Casey Klein
e0643611c3 Fixes "Reduce until ..." in stepper 2010-08-18 13:19:12 -05:00
Casey Klein
7daf515f65 Fixes a bug in `define-extended-language' 2010-08-18 13:19:12 -05:00
Casey Klein
85093fb536 Fixes a `plug' bug. 
There are still problems with contexts, but this is an improvement.
 2010-08-18 13:19:11 -05:00