Package jason.stdlib
Class eval
java.lang.Object
jason.asSemantics.DefaultInternalAction
jason.stdlib.eval
- All Implemented Interfaces:
InternalAction
,java.io.Serializable
@Manual(literal=".eval(term,query)", hint="evaluates the logical expression (which computes to true or false), the result is unified with term", argsHint={"the variable that unifies with the result of evaluation","the formula that is evaluated"}, argsType={"variable, atoms true or false","logical formula"}, examples={".eval(X, true | false): X unifies with true",".eval(X, 3<5 & not 4+2<3): X unifies with true"}, seeAlso="") public class eval extends DefaultInternalAction
Internal action: .eval(Var,Logical Expression)
.
Description: evaluates the logical expression (which computes to true or false), the result is unified with Var.
Parameters:
- + term (variable, atoms true or false): the variable that unifies with the result of evaluation.
- + query (logical formula): the formula that is evaluated.
Examples:
-
.eval(X, true | false)
:X
unifies withtrue
. -
.eval(X, 3<5 & not 4+2<3)
:X
unifies withtrue
.
- See Also:
- Serialized Form
-
Constructor Summary
Constructors Constructor Description eval()
-
Method Summary
Modifier and Type Method Description protected void
checkArguments(Term[] args)
java.lang.Object
execute(TransitionSystem ts, Unifier un, Term[] args)
Executes the internal action.int
getMaxArgs()
int
getMinArgs()
Term[]
prepareArguments(Literal body, Unifier un)
Prepare body's terms to be used in 'execute', normally it consist of cloning and applying each termMethods inherited from class jason.asSemantics.DefaultInternalAction
canBeUsedInContext, destroy, suspendIntention
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
-
Constructor Details
-
eval
public eval()
-
-
Method Details
-
getMinArgs
public int getMinArgs()- Overrides:
getMinArgs
in classDefaultInternalAction
-
getMaxArgs
public int getMaxArgs()- Overrides:
getMaxArgs
in classDefaultInternalAction
-
prepareArguments
Description copied from interface:InternalAction
Prepare body's terms to be used in 'execute', normally it consist of cloning and applying each term- Specified by:
prepareArguments
in interfaceInternalAction
- Overrides:
prepareArguments
in classDefaultInternalAction
-
checkArguments
- Overrides:
checkArguments
in classDefaultInternalAction
- Throws:
JasonException
-
execute
public java.lang.Object execute(TransitionSystem ts, Unifier un, Term[] args) throws java.lang.ExceptionDescription copied from interface:InternalAction
Executes the internal action. It should return a Boolean or an Iterator. A true boolean return means that the IA was successfully executed. An Iterator result means that there is more than one answer for this IA (e.g. see member internal action). - Specified by:
execute
in interfaceInternalAction
- Overrides:
execute
in classDefaultInternalAction
- Throws:
java.lang.Exception
-