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Code Issues 15 Releases 21 Activity
289 Commits 2 Branches 21 Tags 2.8 MiB
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95 Commits

Author SHA1 Message Date
Patrick Lühne 8c250f5c59
Support modulus operation (absolute value) 
This adds support for computing the absolute value of a term along with
an according unit test.
 2018-04-12 00:38:48 +02:00
Patrick Lühne 797660d6de
Add new simplification rule 
This adds the rule “(not F [comparison] G) === (F [negated comparison]
G)” to the simplification rule tableau.
 2018-04-11 21:39:27 +02:00
Patrick Lühne 40ddee8444
Add new simplification rule 
This adds the rule “(not F or G) === (F -> G)” to the simplification
rule tableau.
 2018-04-10 22:34:47 +02:00
Patrick Lühne 6f7b021712
Add new simplification rule 
This adds the rule “(not (F and G)) === (not F or not G)” to the
simplification rule tableau.
 2018-04-10 22:34:47 +02:00
Patrick Lühne 23624007ec
Add new simplification rule 
This adds the rule “not not F === F” to the simplification rule tableau.
 2018-04-10 22:34:47 +02:00
Patrick Lühne 6d7b91c391
Add new simplification rule 
This adds the rule “(F <-> (F and G)) === (F -> G)” to the
simplification rule tableau.
 2018-04-10 22:34:47 +02:00
Patrick Lühne b88393655a
Iteratively apply simplification tableau rules 
With this change, the tableau rules for simplifying formula are applied
iteratively until a fixpoint is reached.
 2018-04-10 22:34:47 +02:00
Patrick Lühne c4c3156e77
Move simplification rule to tableau 
This moves the rule “[primitive A] in [primitive B] === A = B” to the
simplification rule tableau.
 2018-04-10 22:34:47 +02:00
Patrick Lühne 107dae7287
Move simplification rule to tableau 
This moves the rule “exists () (F) === F” to the simplification rule
tableau.
 2018-04-10 22:34:47 +02:00
Patrick Lühne 827d6e40fe
Move simplification rule to tableau 
This moves the rule “[conjunction of only F] === F” to the
simplification rule tableau.
 2018-04-10 22:34:47 +02:00
Patrick Lühne 4a85fc4b23
Move simplification rule to tableau 
This moves the rule “exists ... ([#true/#false]) === [#true/#false]” to
the simplification rule tableau along with “[empty conjunction] ===
 2018-04-10 22:34:46 +02:00
Patrick Lühne 7e3fc007c8
Move simplification rule to tableau 
This moves the rule “exists X (X = t and F(X)) === exists () (F(t))” to
the simplification rule tableau.
 2018-04-10 22:34:46 +02:00
Patrick Lühne 5c5411c0ff
Implement simplification rule tableau 
This implements a tableau containing simplification rules that can be
iteratively applied to input formulas until they remain unchanged.

First, this moves the rule “exists X (X = Y) === #true” to the tableau
as a reference implementation.
 2018-04-10 22:34:46 +02:00
Patrick Lühne e64b2e70de
Remove unused captured lambda reference 2018-04-08 20:44:43 +02:00
Patrick Lühne c294a29cb2
Support placeholders with #external declarations 
This adds support for declaring predicates as placeholders through the
“#external” directive in the input language of clingo.

Placeholders are not subject to completion. This prevents predicates
that represent instance-specific facts from being assumed as universally
false by default negation when translating an encoding.

This stretches clingo’s usual syntax a bit to make the implementation
lightweight. In order to declare a predicate with a specific arity as a
placeholder, the following statement needs to be added to the program:

    #external <predicate name>(<arity>).

Multiple unit tests cover cases where placeholders are used or not as
well as a more complex graph coloring example.
 2018-04-08 20:28:57 +02:00
Patrick Lühne 22238bb398
Switch to C++17 
With C++17, optionals, an experimental language feature, were moved to
the “std” namespace. This makes C++17 mandatory and drops the now
obsolete “experimental” namespace.
 2018-03-24 16:09:52 +01:00
Patrick Lühne 5f8c144628
Fixed regression in simplifying predicates with more than one argument. 2017-06-12 18:27:39 +02:00
Patrick Lühne 1f1006ea96
Corrected hiding predicates that are simple propositions. 2017-06-12 15:40:02 +02:00
Patrick Lühne a4cd133ba7
Correctly implemented hiding predicates with nested arguments. 2017-06-12 02:25:04 +02:00
Patrick Lühne bbbd0b65a4
Added new option --parentheses=full to make parsing the output easier. 2017-06-06 02:02:26 +02:00
Patrick Lühne 0285c1cbbb
Renamed internal variables for clarity. 2017-06-06 01:44:44 +02:00
Patrick Lühne 95984f0447
Added warning when attempting to use #show statements without completion. 2017-06-05 04:24:00 +02:00
Patrick Lühne 7ae0a1f289
Removed unnecessary parentheses after simplification. 2017-06-05 03:58:39 +02:00
Patrick Lühne 3b26580815
Minor formatting. 2017-06-05 03:54:17 +02:00
Patrick Lühne 14abc37116
Implemented #show statements for completed output. 2017-06-05 03:02:22 +02:00
Patrick Lühne 4fd143ef64
Added simplification rule “exists X (X = Y)” → “#true.” 2017-06-05 02:41:17 +02:00
Patrick Lühne 7bf5d3867d
Minor clarification on side effects of a function. 2017-06-05 00:19:43 +02:00
Patrick Lühne ab71e8eb0a
Minor refactoring. 2017-06-04 20:55:25 +02:00
Patrick Lühne dcc504ebc0
Added another simplification step after completion. 2017-06-04 20:55:24 +02:00
Patrick Lühne 381d55b6ed
Minor formatting fix. 2017-06-01 16:16:06 +02:00
Patrick Lühne 2bc60d3eea
Started implementing support for #show statements. 2017-06-01 04:05:11 +02:00
Patrick Lühne cdcee897ec
Added missing error message when input file does not exist. 2017-06-01 03:29:09 +02:00
Patrick Lühne 4baed6fbc6
Added back completion support. 2017-06-01 02:37:45 +02:00
Patrick Lühne 0d8b1e94da
Refactored error handling. 2017-05-31 18:03:19 +02:00
Patrick Lühne 1de0486989
Removed unnecessary namespace identifiers. 2017-05-30 18:13:31 +02:00
Patrick Lühne 664a57ec68
Fixed issue with multi-layer variable stacks. 2017-05-30 18:09:33 +02:00
Patrick Lühne 7aad8380d1
Refactored logging interface. 2017-05-30 17:19:26 +02:00
Patrick Lühne 8214d7837a
Fixed incorrect variable declaration look-up in variable stack. 2017-05-30 16:40:14 +02:00
Patrick Lühne 2964dd1309
Restricting variable stack look-up to user-defined variables. 2017-05-30 16:39:44 +02:00
Patrick Lühne f78c0e4da5
Reordered constructor parameters of VariableDeclaration. 2017-05-30 16:27:45 +02:00
Patrick Lühne 1917f18b6a
Added back simplification support. 2017-05-30 04:06:56 +02:00
Patrick Lühne 1c925d661b
Major refactoring to uniquely link variables to their declarations (breaks simplification and completion). 2017-05-30 03:56:35 +02:00
Patrick Lühne c2f8762dc1
Removed unnecessary CMake directive. 2017-05-08 14:41:02 +02:00
Patrick Lühne 6e7abb283e
Fixed minor incorrect variable references. 2017-04-10 17:50:19 +02:00
Patrick Lühne 5948d30e5c
Refactored implementation of completion. 2017-04-10 16:32:12 +02:00
Patrick Lühne 37526bcc8e
Fixed incorrect handling of implications with Booleans. 2017-04-08 20:17:01 +02:00
Patrick Lühne 8210adea7c
Added support for completion of integrity constraints. 2017-04-08 18:25:59 +02:00
Patrick Lühne a716da4af1
Finished implementing completion (unit tests to follow). 2017-04-08 16:21:24 +02:00
Patrick Lühne a23e248e7b
Omitting the universal quantifier for completion if predicate is 0-ary. 2017-04-08 14:51:16 +02:00
Patrick Lühne 811eb3054c
Partly implemented completion. 2017-04-06 17:46:16 +02:00