Package com.sk89q.worldedit.internal.expression

Class Expression

java.lang.Object

com.sk89q.worldedit.internal.expression.Expression

All Implemented Interfaces:

Cloneable

public class Expression
extends Object
implements Cloneable

Compiles and evaluates expressions.

Supported operators:

• Logical: &&, ||, ! (unary)
• Bitwise: ~ (unary), >>, <<
• Arithmetic: +, -, *, /, % (modulo), ^ (power), - (unary), --, ++ (prefix only)
• Comparison: <=, >=, >, <, ==, !=, ~= (near)

Supported functions: abs, acos, asin, atan, atan2, cbrt, ceil, cos, cosh, exp, floor, ln, log, log10, max, max, min, min, rint, round, sin, sinh, sqrt, tan, tanh and more. (See the Functions class or the wiki)

Constants: e, pi

To compile an equation, run Expression.compile("expression here", "var1", "var2"...). If you wish to run the equation multiple times, you can then optimize it, by calling optimize(). You can then run the equation as many times as you want by calling evaluate(double...). You do not need to pass values for all slots specified while compiling. To query slots after evaluation, you can use the slot table.

Method Summary

Modifier and Type	Method	Description
Expression	clone()
static Expression	compile(String expression, String... variableNames)
double	evaluate(double... values)
double	evaluate(double[] values, int timeout)
ExpressionEnvironment	getEnvironment()
SlotTable	getSlots()
void	optimize()
void	setEnvironment(ExpressionEnvironment environment)
String	toString()

Methods inherited from class java.lang.Object

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

Method Details

compile

public static Expression compile(String expression,
 String... variableNames)
                          throws ExpressionException

Throws:

ExpressionException

evaluate

public double evaluate(double... values)
                throws EvaluationException

Throws:

EvaluationException

evaluate

public double evaluate(double[] values,
 int timeout)
                throws EvaluationException

Throws:

EvaluationException

optimize

public void optimize()

toString

public String toString()

Overrides:

toString in class Object

getSlots

public SlotTable getSlots()

getEnvironment

public ExpressionEnvironment getEnvironment()

setEnvironment

public void setEnvironment(ExpressionEnvironment environment)

clone

public Expression clone()

Overrides:

clone in class Object