static String encodeName(Term t) {
return encodeName(t.getName());
}
/**
* Returns {@code true} if the specified {@link Term} represent a conjunction, else {@code false}.
*
* <p>A {@link Term} is judged to represent a conjunction if is a structure with a functor of
* {@link #CONJUNCTION_PREDICATE_NAME} and exactly two arguments.
*/
public static boolean isConjunction(Term t) {
// is relying on assumption that conjunctions are only, and always, represented by a comma
return t.getType() == TermType.STRUCTURE
&& CONJUNCTION_PREDICATE_NAME.equals(t.getName())
&& t.getArgs().length == 2;
}
/**
* Returns {@code true} if the specified {@link Term} represents a question or directive, else
* {@code false}.
*
* <p>A {@link Term} is judged to represent a question if it is a structure a single argument and
* with a functor {@link #QUESTION_PREDICATE_NAME} or {@link #IMPLICATION_PREDICATE_NAME}.
*/
public static boolean isQuestionOrDirectiveFunctionCall(Term t) {
return t.getType() == TermType.STRUCTURE
&& t.getNumberOfArguments() == 1
&& (QUESTION_PREDICATE_NAME.equals(t.getName())
|| IMPLICATION_PREDICATE_NAME.equals(t.getName()));
}
/**
* Returns {@code true} if the specified {@link Term} represent a {@code dynamic} function call,
* else {@code false}.
*
* <p>A {@link Term} is judged to represent a dynamic function call (i.e. a request to mark a user
* defined predicate as "dynamic") if it is a structure with a functor of {@code dynamic} and a
* single argument.
*/
public static boolean isDynamicFunctionCall(Term t) {
return "dynamic".equals(t.getName()) && t.getNumberOfArguments() == 1;
}