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package org.luaj.vm2.lib.jse;
import org.luaj.vm2.LuaValue;
import org.luaj.vm2.lib.LibFunction;
/**
* Subclass of {@link LibFunction} which implements the lua standard {@code math}
* library.
*
* It contains all lua math functions, including those not available on the JME platform.
* See {@link org.luaj.lib.MathLib} for the exception list.
*
* Typically, this library is included as part of a call to
* {@link JsePlatform#standardGlobals()}
*
* To instantiate and use it directly,
* link it into your globals table via {@link LuaValue#load(LuaValue)} using code such as:
*
{@code
* LuaTable _G = new LuaTable();
* LuaThread.setGlobals(_G);
* _G.load(new JseBaseLib());
* _G.load(new PackageLib());
* _G.load(new JseMathLib());
* System.out.println( _G.get("math").get("sqrt").call( LuaValue.valueOf(2) ) );
* }
* Doing so will ensure the library is properly initialized
* and loaded into the globals table.
*
* This has been implemented to match as closely as possible the behavior in the corresponding library in C.
* @see LibFunction
* @see JsePlatform
* @see JmePlatform
* @see JseMathLib
* @see http://www.lua.org/manual/5.1/manual.html#5.6
*/
public class JseMathLib extends org.luaj.vm2.lib.MathLib {
public JseMathLib() {}
public LuaValue call(LuaValue env) {
super.call(env);
LuaValue math = env.get("math");
math.set("acos", new acos());
math.set("asin", new asin());
math.set("atan", new atan());
math.set("atan2", new atan2());
math.set("cosh", new cosh());
math.set("exp", new exp());
math.set("log", new log());
math.set("pow", new pow());
math.set("sinh", new sinh());
math.set("tanh", new tanh());
return math;
}
static final class acos extends UnaryOp { protected double call(double d) { return Math.acos(d); } }
static final class asin extends UnaryOp { protected double call(double d) { return Math.asin(d); } }
static final class atan extends UnaryOp { protected double call(double d) { return Math.atan(d); } }
static final class atan2 extends BinaryOp { protected double call(double y, double x) { return Math.atan2(y, x); } }
static final class cosh extends UnaryOp { protected double call(double d) { return Math.cosh(d); } }
static final class exp extends UnaryOp { protected double call(double d) { return Math.exp(d); } }
static final class log extends UnaryOp { protected double call(double d) { return Math.log(d); } }
static final class pow extends BinaryOp { protected double call(double x, double y) { return Math.pow(x, y); } }
static final class sinh extends UnaryOp { protected double call(double d) { return Math.sinh(d); } }
static final class tanh extends UnaryOp { protected double call(double d) { return Math.tanh(d); } }
/** Faster, better version of pow() used by arithmetic operator ^ */
public double dpow_lib(double a, double b) {
return Math.pow(a, b);
}
}