Commit Graph

305 Commits

Author SHA1 Message Date
63f39e5162
Provide function for evaluating formulas
This provides a new function that can be used to evaluate formulas under
partial knowledge about the individual variables’ assignments.

This will be useful for testing whether formulas or subformulas become
trivial under specific interpretations.
2018-04-29 21:27:31 +02:00
811523e580
Provide term type deduction function
This implements a function for retrieving the return type of terms, that
is, both the domain to which the expression evaluates to as well as
whether it’s an empty, unit, or general set with multiple values.
2018-04-29 21:20:29 +02:00
09ef64a0e1
Support declaring functions as integer
This adds a new syntax for declaring functions integer:

    #external integer(<function name>(<arity)).

If a function is declared integer, it may enable some variables to be
detected as integer as well.
2018-04-28 01:48:39 +02:00
43d2c153c7
Represent predicate parameters explicitly
This adds a vector of Parameter structs to PredicateDeclaration. In this
way, the domain of each parameter can be tracked individually.
2018-04-28 01:48:39 +02:00
541cb3fb47
Add domain specifier to variable declarations
With this change, the domain of variable declarations can be specified.
Variables can have the integer domain, in which case additional integer-
specific simplification rules apply. Aside from that, the noninteger
domain represents precomputed values. An additional “unknown” domain is
introduced to flag variable domains prior to determining whether they
are integer or not.
2018-04-28 01:48:39 +02:00
921d5ed4f0
Remove unnecessary include directives 2018-04-28 00:16:55 +02:00
e0509f725a
Replace SimplificationResult with OperationResult
This replaces the SimplificationResult enum class with OperationResult.
The rationale is that this type, which just reports whether or not an
operation actually changed the input data, is not simplification-
specific and will be used for integer variable detection as well.
2018-04-27 23:37:13 +02:00
48cf8ee3e0
Minor refactoring
Reorders some include directives lexicographically.
2018-04-27 23:35:43 +02:00
f7d99c82fa
Move Tristate class to Utils header
The Tristate class (representing truth values that are either true,
false, or unknown) will be used at multiple ends. This moves it to a
separate header in order to reuse it properly.
2018-04-27 23:19:42 +02:00
618189368c
Split functions from their declarations
This splits occurrences of functions from their declaration. This is
necessary to flag integer functions consistently and not just single
occurrences.
2018-04-27 17:59:10 +02:00
d0debc6ad1
Split predicates from their declarations
This refactoring separates predicates from their declarations. The
purpose of this is to avoid duplicating properties specific to the
predicate declaration and not its occurrences in the program.
2018-04-27 17:55:59 +02:00
3ba80e8c9d
Minor refactoring 2018-04-27 17:38:29 +02:00
d66d3557c1
Minor refactoring 2018-04-27 17:25:43 +02:00
e15a6b2e88
Remove Constant class
Constants are not a construct present in Clingo’s AST and were
unintentionally made part of anthem’s AST. This removes the unused
classes for clarity.
2018-04-27 17:08:41 +02:00
9a59ac17f5
Version bump after release 0.1.8 2018-04-20 16:37:03 +02:00
250942643c
Version bump for release 0.1.8 2018-04-20 16:35:35 +02:00
815bcda367
Update cxxopts to 2.1.0+1+gcc4914f
cxxopts 2.1.0 has a bug preventing it from being used with standard main
signatures. This updates cxxopts to the commit after release 2.1.0,
where this issue was addressed.
2018-04-13 14:03:30 +02:00
04094eee23
Remove unnecessary parentheses
The unary modulus operation does not require extra parentheses to be
printed in cases like “|X + Y|”. This adds a new option to the printing
routine to omit parentheses in cases where the parent expression already
defines a parenthesis-like scope (currently only with unary operations).
2018-04-12 00:59:03 +02:00
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
0608748349
Describe --complete option in readme
The readme was missing information on the --complete option. This adds a
brief mention of Clark’s completion to the readme.
2018-04-11 23:21:56 +02:00
31d4a20491
Update change log with recent additions
This updates the change log with the advanced simplification rules,
support for the exponentation operator, and the newly added examples.
2018-04-11 21:50:15 +02:00
a01e78a467
Add example program for prime number detection 2018-04-11 21:42:08 +02:00
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
b63ef21849
Add example program generating permutations 2018-04-11 21:35:29 +02:00
cc3c9b642c
Minor formatting in graph coloring example 2018-04-11 21:35:04 +02:00
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
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
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
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
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
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
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
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
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
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
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
eaabeb0c55
Support exponentiation operator
Because of a bug in the Clingo API, the exponentation operator was not
properly exposed to anthem. This updates Clingo to a version with a
fixed API and adds proper support for exponentation within anthem along
with a matching unit test.
2018-04-10 22:29:55 +02:00
7b6729acaa
Add missing dependency to Ubuntu image
For some reason, Bison is not implicitly installed along with the other
dependencies in the Ubuntu 18.04 image used for continuous integration.
This adds Bison explicitly.
2018-04-10 22:29:55 +02:00
92fddd6665
Version bump after release 0.1.7 2018-04-08 21:03:20 +02:00
582b6ade6d
Version bump for release 0.1.7 2018-04-08 20:44:43 +02:00
e64b2e70de
Remove unused captured lambda reference 2018-04-08 20:44:43 +02:00
d7e4af98d7
Update copyright year in license file 2018-04-08 20:35:03 +02:00
a406cb43bd
Update graph coloring example with placeholders
This replaces the former graph coloring example with a new formulation
that makes use of the newly supported placeholders.
2018-04-08 20:28:57 +02:00
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
c91cbaf58b
Update Catch to 2.2.2 2018-04-07 00:22:01 +02:00
2a2fec0eac
Update change log with dependency change
This adds the dependency change from Boost (for program options) to
cxxopts to the change log.
2018-04-06 23:08:57 +02:00
09e56c3bce
Format change log sections with proper headings
This makes the change log sections have proper headings, which were just
normal text before.
2018-04-06 22:53:59 +02:00
e2c0d6b705
Update cxxopts to 2.0.0+3+gabe9ebd
With cxxopts 2.0.0, positional arguments weren’t recognized when other
command-line options were passed before. This has been fixed in the
meantime, but there is no release with the bug fix yet.

This updates cxxopts to a newer commit to ship anthem with this fix.
2018-04-06 22:44:14 +02:00
e01506f9ff
Drop Boost dependency
Boost was only used for program option parsing. To avoid this huge
dependency, this commit replaces boost::program_options with cxxopts,
a header-only library with the same functionality.

cxxopts is added as a submodule, and Boost is removed from the
dependencies in the code and Travis configuration.
2018-03-25 17:24:06 +02:00
50ebf3c6de
Install g++ package explicitly on Ubuntu
Apparently, g++ is only installed because of the Boost dependency.
Make the g++ dependency explicit to avoid future package errors.
2018-03-25 17:23:33 +02:00