jason.stdlib
Class substring

java.lang.Object
  jason.asSemantics.DefaultInternalAction
      jason.stdlib.substring

All Implemented Interfaces:

InternalAction, java.io.Serializable

public class substring
extends DefaultInternalAction

Internal action: .substring.

Description: checks if a string is sub-string of another string. The arguments can be other kinds of terms, in which case the toString() of the term is used. If "position" is a free variable, the internal action backtracks all possible values for the positions where the sub-string occurs in the string.

Parameters:

• + substring (any term).
  
• + string (any term).
  
• +/- position (optional -- integer): the position of the string where the sub-string occurs.

Examples:

• .substring("b","aaa"): false.
• .substring("b","aaa",X): false.
• .substring("a","bbacc"): true.
• .substring("a","abbacca",X): true and X unifies with 0, 3, and 6.
• .substring("a","bbacc",0): false.
• .substring(a(10),b(t1,a(10)),X): true and X unifies with 5.
• .substring(a(10),b("t1,a(10)"),X): true and X unifies with 6.

See Also:

concat, delete, length, reverse, Serialized Form

Constructor Summary

substring()

Method Summary

static InternalAction	create()
java.lang.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, prepareArguments, suspendIntention

Methods inherited from class java.lang.Object

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

Constructor Detail

substring

public substring()

Method Detail

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 java.lang.Object execute(TransitionSystem ts,
                                Unifier un,
                                Term[] args)
                         throws java.lang.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:

java.lang.Exception