Patrick Lühne
c294a29cb2
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.
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| .. | ||
| output | ||
| AST.h | ||
| ASTCopy.h | ||
| ASTForward.h | ||
| ASTUtils.h | ||
| ASTVisitors.h | ||
| Body.h | ||
| Completion.h | ||
| Context.h | ||
| Exception.h | ||
| Head.h | ||
| HiddenPredicateElimination.h | ||
| Location.h | ||
| RuleContext.h | ||
| Simplification.h | ||
| StatementVisitor.h | ||
| Term.h | ||
| Translation.h | ||
| Utils.h | ||