Package com.singularsys.jep.misc.functions

Class AssignableList

java.lang.Object

com.singularsys.jep.functions.PostfixMathCommand

com.singularsys.jep.functions.List

com.singularsys.jep.misc.functions.AssignableList

All Implemented Interfaces:

LValueI, PostfixMathCommandI, Serializable

public class AssignableList
extends List
implements LValueI

A list than can be assigned to [x,y,z] = [1,2,3]. Items in the left hand side list must be variables or functions implementing LValueI. This allow elements in a vector to be swapped [v[2],v[1]]=v.

This function can be used as a replacement for List

     Jep jep = new Jep(new StandardConfigurableParser());
     jep.getOperatorTable().getList().setPFMC(new AssignableList());
     Node n = jep.parse("[x,y] = [3,4]");
     Object res = jep.evaluate(n);
 

Since:

Jep 4.1

See Also:

• Serialized Form

Field Summary

Fields inherited from class com.singularsys.jep.functions.PostfixMathCommand

curNumberOfParameters, description, name, NaN, numberOfParameters

Constructor Summary

Constructors

Constructor	Description
AssignableList()

Method Summary

Modifier and Type	Method	Description
void	set(Evaluator pv, Node node, Object value)	Performs appropriate action to set an LValue.

Methods inherited from class com.singularsys.jep.functions.List

run

Methods inherited from class com.singularsys.jep.functions.PostfixMathCommand

asArray, asBool, asDouble, asInt, asLong, asStrictInt, asString, asType, checkNumberOfParameters, getDescription, getDescription, getDescriptionWithType, getName, getNumberOfParameters, setCurNumberOfParameters, setDescription, setName, toString, toString

Methods inherited from class java.lang.Object

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

Constructor Details

AssignableList

public AssignableList()

Method Details

set

public void set(Evaluator pv,
 Node node,
 Object value)
         throws EvaluationException

Description copied from interface: LValueI

Performs appropriate action to set an LValue.

Specified by:

set in interface LValueI

Parameters:

pv - a pointer to the evaluator. The pv.eval() method can be used to evaluate the children of the node.

node - The top node for the LValue

value - the value obtained by evaluating the right-hand side.

Throws:

EvaluationException - if the calculation cannot be performed