public static Equation parse(String input) {
if (input == null) {
throw new NullPointerException("The parameter [input] is null.");
}
String[] sides = input.replace('(', ' ').replace(')', ' ').trim().split("=");
if (sides.length < 2) {
return null;
}
Derivation der = Derivation.parse(sides[0]);
Coefficient c = Coefficient.parse(sides[1]);
if (c != null) {
return new Equation(der, c);
}
Variable v = Variable.parse(sides[1]);
if (v != null) {
return new Equation(der, v);
}
Multiplication mul = Multiplication.parse(sides[1]);
if (mul != null) {
return new Equation(der, mul);
}
Addition add = Addition.parse(sides[1]);
if (add != null) {
return new Equation(der, add);
}
return null;
}
