common.pl -- Common predicates used in multiple files

Common and utility predicates that may be called from multiple locations.

author

- Kyle Marple

version

- 20170127

license

- BSD-3

 predicate(?PredicateStruct:compound, ?Name:atom, ?Args:list) is det

Convert a predicate struct to its components, or vice-versa. Ensure this doesn't succeed for operators or not(_).

Arguments:

PredicateStruct	- Predicate sturct.
Name	- Predicate name, in name/arity format.
Args	- List of predicate args.

 c_rule(?Rule:compound, ?Head:compound, ?Body:list) is det

Convert a rule structure into its head and body, or vice-versa. Note that if an ID has been attached, it will be paired with the head as Head = -(RealHead, ID). This can be taken advantage of if the head and ID are simply being copied, but should be used with care.

Arguments:

Rule	- Rule struct.
Head	- Rule head.
Body	- Rule body.

 rule(?Rule:compound, ?Head:compound, ?ID:int, ?Body:list) is det

Convert a rule structure with an id into its head, ID and body, or vice-versa.

Arguments:

Rule	- Rule struct.
Head	- Rule head.
ID	- Rule ID.
Body	- Rule body.

 negate_functor(+Functor:atom, -NegFunctor:atom) is det

Given the functor of a predicate (of the form name/arity), return the negation.

Arguments:

Functor	- The functor of a predicate.
NegFunctor	- The negated functor.

 is_dual(+Functor:atom) is semidet

Succeed if a functor contains the prefix '_not_', indicating that it's a dual.

Arguments:

Functor

- The functor to test.

 is_global_constraint(+Term:callable, -Nth:integer) is semidet

True when this is a predicate implementing the Nth global constraint

 join_functor(-Functor, +Name, +Arity) is det

 create_unique_functor(+Head:ground, +Counter:int, -NewHead:ground) is det

Create a unique functor by inserting the counter characters just before the _Arity.

Arguments:

Head	- A functor of the form head/arity to form the base of the unique functor.
Counter	- Counter to ensure that the functor is unique. Don't reuse it with the same base.
DualHead	- The functor for the dual of an individual clause.

 raise_negation(+Goal, -UserGoal) is det

 intern_negation(+QIn, -QOut) is det

 operator(+Operator:ground, -Specifier:atom, -Priority:int) is det

ASP/Prolog operator table. Original table from the ISO Prolog standard, with unsupported operators removed. NOTE: Some of the operators below may not have been implemented yet.

Arguments:

Operator	- An arithmetic operator.
Specifier	- Defines associativity of operator.
Priority	- Defines operator priority.

Re-exported predicates

The following predicates are exported from this file while their implementation is defined in imported modules or non-module files loaded by this module.

 split_functor(+Functor:atom, -Name:atom, -Arity:int) is det

Given a predicate functor, return the components. Since the arity is at the end, we have to be creative to remove it.

Arguments:

Functor	- The predicate functor, of the form Name_Arity.
Name	- The name with the arity stripped. A list of characters.
Arity	- The arity of the predicate, or -1 if no arity is attached.