com.sk89q.worldedit.expression

Class Expression

java.lang.Object

com.sk89q.worldedit.expression.Expression

public class Expression
extends Object

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 myExpression.optimize(); You can then run the equation as many times as you want by calling myExpression.evaluate(var1, var2...) You do not need to pass values for all variables specified while compiling. To query variables after evaluation, you can use myExpression.getVariable("variable name"). To get a value out of these, use myVariable.getValue() Variables are also supported and can be set either by passing values to evaluate

Author:

TomyLobo

Method Summary

Methods

Modifier and Type	Method and Description
static Expression	compile(String expression, String... variableNames)
double	evaluate(double... values)
ExpressionEnvironment	getEnvironment()
Functions	getFunctions()
static Expression	getInstance()
RValue	getVariable(String name, boolean create)
void	optimize()
void	setEnvironment(ExpressionEnvironment environment)
String	toString()

Methods inherited from class java.lang.Object

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

Method Detail

compile

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

Throws:

ExpressionException

evaluate

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

Throws:

EvaluationException

optimize

public void optimize()
              throws EvaluationException

Throws:

EvaluationException

toString

public String toString()

Overrides:

toString in class Object

getVariable

public RValue getVariable(String name,
                 boolean create)

getInstance

public static Expression getInstance()

getFunctions

public Functions getFunctions()

getEnvironment

public ExpressionEnvironment getEnvironment()

setEnvironment

public void setEnvironment(ExpressionEnvironment environment)