Add Modulo (%) operator

src/main/java/de/siphalor/nbtcrafting/dollar/DollarParser.java

@@ -55,7 +55,8 @@ public final class DollarParser {
 			},
 			new DollarPart.Deserializer[] {
 					new ProductDollarOperator.Deserializer(),
-					new QuotientDollarOperator.Deserializer()
+					new QuotientDollarOperator.Deserializer(),
+					new ModuloDollarOperator.Deserializer()
 			},
 			new DollarPart.Deserializer[] {
 					new SumDollarOperator.Deserializer(),

src/main/java/de/siphalor/nbtcrafting/dollar/part/operator/ModuloDollarOperator.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright 2020-2022 Siphalor
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+ * either express or implied.
+ * See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+package de.siphalor.nbtcrafting.dollar.part.operator;
+
+import org.apache.commons.lang3.StringUtils;
+
+import de.siphalor.nbtcrafting.dollar.DollarDeserializationException;
+import de.siphalor.nbtcrafting.dollar.DollarException;
+import de.siphalor.nbtcrafting.dollar.DollarParser;
+import de.siphalor.nbtcrafting.dollar.part.DollarPart;
+import de.siphalor.nbtcrafting.dollar.part.ValueDollarPart;
+import de.siphalor.nbtcrafting.util.NumberUtil;
+
+public class ModuloDollarOperator extends BinaryDollarOperator {
+	private ModuloDollarOperator(DollarPart first, DollarPart second) {
+		super(first, second);
+	}
+
+	public static DollarPart of(DollarPart first, DollarPart second) throws DollarException {
+		DollarPart instance = new ModuloDollarOperator(first, second);
+		if (first.isConstant() && second.isConstant()) {
+			return ValueDollarPart.of(instance.evaluate(null));
+		}
+		return instance;
+	}
+
+	@Override
+	public Object apply(Object first, Object second) {
+		if (first instanceof Number && second instanceof Number) {
+			return NumberUtil.remainder((Number) first, (Number) second);
+		}
+		return null;
+	}
+
+	public static class Deserializer implements DollarPart.Deserializer {
+		@Override
+		public boolean matches(int character, DollarParser dollarParser) {
+			return character == '%';
+		}
+
+		@Override
+		public DollarPart parse(DollarParser dollarParser, DollarPart lastDollarPart, int priority) throws DollarDeserializationException {
+			dollarParser.skip();
+			return new ModuloDollarOperator(lastDollarPart, dollarParser.parse(priority));
+		}
+	}
+}

src/main/java/de/siphalor/nbtcrafting/util/NumberUtil.java

@@ -1,21 +1,21 @@
-/*
- * Copyright 2020-2022 Siphalor
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
- * either express or implied.
- * See the License for the specific language governing
- * permissions and limitations under the License.
- */
-
-package de.siphalor.nbtcrafting.util;
+/*
+ * Copyright 2020-2022 Siphalor
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
+ * either express or implied.
+ * See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+package de.siphalor.nbtcrafting.util;
 
 import org.apache.commons.lang3.ArrayUtils;
 import org.apache.commons.lang3.StringUtils;
@@ -174,4 +174,25 @@ public static Number quotient(Number a, Number b) {
 				return a.doubleValue() / b.doubleValue();
 		}
 	}
+
+	public static Number remainder(Number a, Number b) {
+		a = denullify(a);
+		if (b == null || b.doubleValue() == 0.0D)
+			return Math.signum(a.doubleValue()) * Double.POSITIVE_INFINITY;
+		switch (findSmallestType(a, b)) {
+			case 0:
+			case 1:
+				return (byte) (a.byteValue() % b.byteValue());
+			case 2:
+				return (short) (a.shortValue() % b.shortValue());
+			case 3:
+				return a.intValue() % b.intValue();
+			case 4:
+				return a.longValue() % b.longValue();
+			case 5:
+				return a.floatValue() % b.floatValue();
+			default:
+				return a.doubleValue() % b.doubleValue();
+		}
+	}
 }