/*
GeoGebra - Dynamic Mathematics for Everyone
http://www.geogebra.org
This file is part of GeoGebra.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation.
*/
package org.geogebra.common.kernel.cas;
import org.geogebra.common.kernel.Construction;
import org.geogebra.common.kernel.algos.AlgoElement;
import org.geogebra.common.kernel.arithmetic.MyArbitraryConstant;
import org.geogebra.common.kernel.commands.Commands;
import org.geogebra.common.kernel.geos.GeoElement;
import org.geogebra.common.kernel.geos.GeoFunction;
import org.geogebra.common.kernel.geos.GeoList;
import org.geogebra.common.kernel.geos.GeoNumeric;
/**
* Try to expand the given function
*
* @author Michael Borcherds
*/
public class AlgoFactors extends AlgoElement implements UsesCAS {
private GeoFunction f; // input
private GeoList g; // output
private StringBuilder sb = new StringBuilder();
/**
* @param cons
* construction
* @param label
* label for output
* @param f
* function
*/
public AlgoFactors(Construction cons, String label, GeoFunction f) {
super(cons);
cons.addCASAlgo(this);
this.f = f;
g = new GeoList(cons);
setInputOutput(); // for AlgoElement
compute();
g.setLabel(label);
}
@Override
public Commands getClassName() {
return Commands.Factors;
}
// for AlgoElement
@Override
protected void setInputOutput() {
input = new GeoElement[1];
input[0] = f;
setOutputLength(1);
setOutput(0, g);
setDependencies(); // done by AlgoElement
}
/**
* @return list of factors
*/
public GeoList getResult() {
return g;
}
private MyArbitraryConstant arbconst = new MyArbitraryConstant(this);
@Override
public final void compute() {
if (!f.isDefined()) {
g.setUndefined();
return;
}
try {
// get function and function variable string using temp variable
// prefixes,
// e.g. f(x) = a x^2 returns {"ggbtmpvara ggbtmpvarx^2",
// "ggbtmpvarx"}
String[] funVarStr = f.getTempVarCASString(false);
sb.setLength(0);
sb.append("Numeric(Factors(");
sb.append(funVarStr[0]); // function expression
sb.append("))");
// cached evaluation of MPReduce as we are only using variable
// values
String listOut = kernel.evaluateCachedGeoGebraCAS(sb.toString(),
arbconst);
if (listOut == null || listOut.length() == 0) {
g.setUndefined();
} else if ("?".equals(listOut)) {
GeoList factor = new GeoList(cons);
factor.add(f.copy());
factor.add(new GeoNumeric(cons, 1));
g.add(factor);
} else {
// read result back into list
g.set(kernel.getAlgebraProcessor().evaluateToList(listOut));
// force first element in each row to be a function, even if
// constant
for (int i = 0; i < g.size()
&& g.get(i) instanceof GeoList; i++) {
GeoList factor = (GeoList) g.get(i);
if (factor.get(0) instanceof GeoNumeric) {
GeoElement constant = factor.get(0);
GeoElement exponent = factor.get(1);
factor.remove(1);
factor.remove(0);
GeoFunction fn = new GeoFunction(cons);
fn.set(constant);
factor.add(fn);
factor.add(exponent);
}
}
}
} catch (Throwable th) {
g.setUndefined();
}
}
}