com.microej.script.interpreter

Class ExpressionEvaluator

java.lang.Object

com.microej.script.interpreter.ExpressionEvaluator

public class ExpressionEvaluator
extends java.lang.Object

Provides a method to evaluate an Expression.

Constructor Summary

Constructors

Constructor and Description
ExpressionEvaluator()

Method Summary

Modifier and Type	Method and Description
protected Value	applyFunction(int function, Value[] arguments) Applies the given function to the given arguments.
Value	evaluate(com.microej.script.ast.expressions.Expression expression) Evaluates the given expression.
protected Value	getValueForTag(int tag) Returns the value of the given tag.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionEvaluator

public ExpressionEvaluator()

Method Detail

evaluate

public Value evaluate(com.microej.script.ast.expressions.Expression expression)
               throws ExpressionEvaluationException

Evaluates the given expression.

Parameters:

expression - the expression to evaluate.

Returns:

the value of the given expression.

Throws:

ExpressionEvaluationException - if the expression could not be evaluated.

getValueForTag

protected Value getValueForTag(int tag)
                        throws ExpressionEvaluationException

Returns the value of the given tag.

This method simply throws an ExpressionEvaluationException by default but it can be overridden.

Parameters:

tag - the tag to get the value of.

Returns:

the value of the given tag.

Throws:

ExpressionEvaluationException - if the tag could not be evaluated.

applyFunction

protected Value applyFunction(int function,
                              Value[] arguments)
                       throws ExpressionEvaluationException

Applies the given function to the given arguments.

This method simply throws an ExpressionEvaluationException by default but it can be overridden.

Parameters:

function - the function to apply.

arguments - the arguments to apply the given function to.

Returns:

the result of the application.

Throws:

ExpressionEvaluationException - if the function could not be applied.