Package jason.stdlib

Class literal

java.lang.Object

jason.asSemantics.DefaultInternalAction

jason.stdlib.literal

All Implemented Interfaces:

InternalAction, Serializable

@Manual(literal=".literal(argument)",
        hint="checks whether the argument is a literal",
        argsHint="the term to be checked",
        argsType="term",
        examples={".literal(b(10)): true",".literal(b(10)[a,b]): true",".literal(~b(20)[a,b]): true",".literal(b): true",".literal(10): false",".literal(\"Jason\"): false",".literal(X): false if X is free, true if X is bound to a literal",".literal(a(X)): true",".literal([a,b,c]): false",".literal([a,b,c(X)]): false"},
        seeAlso={"jason.stdlib.atom","jason.stdlib.list","jason.stdlib.number","jason.stdlib.string","jason.stdlib.structure","jason.stdlib.ground"})
public class literal
extends DefaultInternalAction

Internal action: .literal.

Description: checks whether the argument is a literal, e.g.: "p", "p(1)", "p(1)[a,b]", "~p(1)[a,b]".

Parameter:

• + argument (any term): the term to be checked.
  

Examples:

• .literal(b(10)): true.
• .literal(b): true.
• .literal(10): false.
• .literal("Jason"): false.
• .literal(X): false if X is free, true if X is bound to a literal.
• .literal(a(X)): true.
• .literal([a,b,c]): false.
• .literal([a,b,c(X)]): false.

See Also:

• atom
• list
• number
• string
• structure
• ground
• Serialized Form

Constructor Summary

Constructors

Constructor	Description
literal()

Method Summary

Modifier and Type	Method	Description
static InternalAction	create()
Object	execute(TransitionSystem ts, Unifier un, Term[] args)	Executes the internal action.
int	getMaxArgs()
int	getMinArgs()

Methods inherited from class jason.asSemantics.DefaultInternalAction

canBeUsedInContext, checkArguments, destroy, prepareArguments, suspendIntention

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

literal

public literal()

Method Details

create

public static InternalAction create()

getMinArgs

public int getMinArgs()

Overrides:

getMinArgs in class DefaultInternalAction

getMaxArgs

public int getMaxArgs()

Overrides:

getMaxArgs in class DefaultInternalAction

execute

public Object execute(TransitionSystem ts,
 Unifier un,
 Term[] args)
               throws Exception

Description 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 interface InternalAction

Overrides:

execute in class DefaultInternalAction

Throws:

Exception