/**
 * Copyright (C) 2019 Adrien Hopkins
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
package test.java;

import static org.junit.Assert.assertEquals;

import org.junit.Test;
import org.unitConverter.math.ExpressionParser;

/**
 * @author Adrien Hopkins
 * @since 2019-03-22
 */
public class ExpressionParserTest {
	private static final ExpressionParser<Integer> numberParser = new ExpressionParser.Builder<>(Integer::parseInt)
			.addBinaryOperator("+", (o1, o2) -> o1 + o2, 0).addBinaryOperator("-", (o1, o2) -> o1 - o2, 0)
			.addBinaryOperator("*", (o1, o2) -> o1 * o2, 1).addBinaryOperator("/", (o1, o2) -> o1 / o2, 1)
			.addBinaryOperator("^", (o1, o2) -> (int) Math.pow(o1, o2), 2).build();

	/**
	 * Test method for {@link org.unitConverter.math.ExpressionParser#parseExpression(java.lang.String)}.
	 */
	@Test
	public void testParseExpression() {
		// test parsing of expressions
		assertEquals((int) numberParser.parseExpression("1 + 2 ^ 5 * 3"), 97);
		assertEquals((int) numberParser.parseExpression("(1 + 2) ^ 5 * 3"), 729);

		// ensure it normally goes left to right
		assertEquals((int) numberParser.parseExpression("1 + 2 + 3 + 4"), 10);
		assertEquals((int) numberParser.parseExpression("12 - 4 - 3"), 5);
		assertEquals((int) numberParser.parseExpression("12 - (4 - 3)"), 11);
		assertEquals((int) numberParser.parseExpression("1 / 2 + 3"), 3);
	}

}