Added a calculator (#180)

* Added a calculator

* Remove stuff

* also add t

* Update Misc.java

* On by default

* add x for multiplication, fixed - not working and quick math solver

Co-authored-by: nopo <noahogno@gmail.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/src/test/java/io/github/moulberry/notenoughupdates/util/CalculatorTest.java b/src/test/java/io/github/moulberry/notenoughupdates/util/CalculatorTest.java
new file mode 100644
index 00000000..66ba5442
--- /dev/null
+++ b/src/test/java/io/github/moulberry/notenoughupdates/util/CalculatorTest.java
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2022 NotEnoughUpdates contributors
+ *
+ * This file is part of NotEnoughUpdates.
+ *
+ * NotEnoughUpdates is free software: you can redistribute it
+ * and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * NotEnoughUpdates 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with NotEnoughUpdates. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package io.github.moulberry.notenoughupdates.util;
+
+import java.math.BigDecimal;
+import java.util.List;
+
+public class CalculatorTest {
+	public static void main(String[] args) throws Calculator.CalculatorException {
+		List<Calculator.Token> lex = Calculator.lex("10k + 3 * 4m");
+		List<Calculator.Token> shunted = Calculator.shuntingYard(lex);
+		for (Calculator.Token rawToken : shunted) {
+			System.out.printf(
+				"%s(%s)",
+				rawToken.type,
+				rawToken.operatorValue == null ? rawToken.numericValue + " * 10 ^ " + rawToken.exponent : rawToken.operatorValue
+			);
+		}
+		System.out.println();
+		BigDecimal evaluate = Calculator.evaluate(shunted);
+		System.out.println("Eval: " + evaluate);
+	}
+
+}