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package org.luaj.vm2.lib.jse;
import org.luaj.vm2.LuaValue;
import org.luaj.vm2.lib.LibFunction;
import org.luaj.vm2.lib.OneArgFunction;
import org.luaj.vm2.lib.TwoArgFunction;
/**
* 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 arg) {
LuaValue t = super.call(arg);
bind( t, JseMathLib1.class, new String[] {
"acos", "asin", "atan", "cosh",
"exp", "log", "log10", "sinh",
"tanh" } );
bind( t, JseMathLib2.class, new String[] {
"atan2", "pow", } );
return t;
}
public static final class JseMathLib1 extends OneArgFunction {
public LuaValue call(LuaValue arg) {
switch ( opcode ) {
case 0: return valueOf(Math.acos(arg.checkdouble()));
case 1: return valueOf(Math.asin(arg.checkdouble()));
case 2: return valueOf(Math.atan(arg.checkdouble()));
case 3: return valueOf(Math.cosh(arg.checkdouble()));
case 4: return valueOf(Math.exp(arg.checkdouble()));
case 5: return valueOf(Math.log(arg.checkdouble()));
case 6: return valueOf(Math.log10(arg.checkdouble()));
case 7: return valueOf(Math.sinh(arg.checkdouble()));
case 8: return valueOf(Math.tanh(arg.checkdouble()));
}
return NIL;
}
}
public static final class JseMathLib2 extends TwoArgFunction {
public LuaValue call(LuaValue arg1, LuaValue arg2) {
switch ( opcode ) {
case 0: return valueOf(Math.atan2(arg1.checkdouble(), arg2.checkdouble()));
case 1: return valueOf(Math.pow(arg1.checkdouble(), arg2.checkdouble()));
}
return NIL;
}
}
/** Faster, better version of pow() used by arithmetic operator ^ */
public double dpow_lib(double a, double b) {
return Math.pow(a, b);
}
}