Package jason.stdlib

Class substring

java.lang.Object

jason.asSemantics.DefaultInternalAction

jason.stdlib.substring

All Implemented Interfaces:

InternalAction, 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).
  
• +/- start position (optional -- integer): the initial position of the string where the sub-string occurs.
• +/- end position (optional -- integer): the position in the string where the sub-string ends.

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. When the third argument is 0, .substring works like a java startsWith method.
• .substring(a(10),b(t1,a(10)),X): true and X unifies with 5.
• .substring(a(10),b("t1,a(10),kk"),X): true and X unifies with 6.
• .substring(R,a(10,20),5): true and R unifies with "20)".
• .substring(R,a(10,20),5,7): true and R unifies with "20".

See Also:

• concat
• delete
• length
• reverse
• Serialized Form

Constructor Summary

Constructors

Constructor	Description
substring()

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

substring

public substring()

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