simplify method

@override Expression simplify()

Simplifies the expression, if possible, and returns a new simplified expression.

Implementation

@override
Expression simplify() {
  final simplifiedOperand = operand.simplify();

  // If the operand is a literal, evaluate and return a new Literal.
  if (simplifiedOperand is Literal) {
    final value = simplifiedOperand.value;
    if (value == 0) {
      return Literal(1); // e^0 = 1
    }
    if (value == 1) {
      return Literal(math.e); // e^1 = e
    }
    return Literal(math.exp(value));
  }

  // If the operand is ln(x), then e^ln(x) = x
  if (simplifiedOperand is Ln) {
    return simplifiedOperand.operand;
  }

  // If operand changed during simplification, return new Exp
  if (simplifiedOperand != operand) {
    return Exp(simplifiedOperand);
  }

  return this;
}