package ru.snake.spritepacker.writer.expression;
import ru.snake.spritepacker.writer.expression.value.Value;
public class MulExpression implements Expression {
private final Expression left;
private final Expression right;
public MulExpression(Expression left, Expression right) {
this.left = left;
this.right = right;
}
public Value getValue() {
Value leftValue = left.getValue();
Value rightValue = right.getValue();
Value result;
if (leftValue.isInteger() && rightValue.isInteger()) {
int opResult = leftValue.getInteger() * rightValue.getInteger();
result = new Value(opResult);
} else if (leftValue.isString() && rightValue.isInteger()) {
StringBuilder builder = new StringBuilder();
String leftString = leftValue.getString();
int count = rightValue.getInteger();
for (int i = 0; i < count; i++) {
builder.append(leftString);
}
result = new Value(builder.toString());
} else {
throw EvaluationException
.create("Multiplication operands can not be string.");
}
return result;
}
public void visit(ExpressionVisitor visitor) {
visitor.visitMul(this);
left.visit(visitor);
right.visit(visitor);
}
@Override
public String toString() {
StringBuilder concat = new StringBuilder();
concat.append(left.toString());
concat.append(" * ");
concat.append(right.toString());
return concat.toString();
}
}