ExprDecimalPlaces

src/main/java/ch/njol/skript/expressions/ExprDecimalPlaces.java

@@ -0,0 +1,44 @@
+package ch.njol.skript.expressions;
+
+import ch.njol.skript.doc.Description;
+import ch.njol.skript.doc.Example;
+import ch.njol.skript.doc.Name;
+import ch.njol.skript.doc.Since;
+import ch.njol.skript.expressions.base.SimplePropertyExpression;
+import ch.njol.util.Math2;
+import org.jetbrains.annotations.Nullable;
+
+@Name("Number of Decimal Places")
+@Description("Gets the number of decimal places in a number.")
+@Example("""
+	set {_decimalPlaces} to the number of decimal places of 1.23456789
+	# {_decimalPlaces} = 8
+	""")
+@Since("INSERT VERSION")
+public class ExprDecimalPlaces extends SimplePropertyExpression<Number, Long> {
+
+	static {
+		register(ExprDecimalPlaces.class, Long.class, "number of decimal places", "numbers");
+	}
+
+	@Override
+	public @Nullable Long convert(Number number) {
+		if (!(number instanceof Double doubleValue))
+			return null;
+		String[] split = doubleValue.toString().split("\\.");
+		if (split.length != 2)
+			return null;
+		return Math2.fit(0, split[1].length(), Long.MAX_VALUE);
+	}
+
+	@Override
+	public Class<Long> getReturnType() {
+		return Long.class;
+	}
+
+	@Override
+	protected String getPropertyName() {
+		return "number of decimal places";
+	}
+
+}

src/test/skript/tests/syntaxes/expressions/ExprDecimalPlaces

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+test "decimal places":
+	assert (the number of decimal places of 1.234) is 3 with "Should return 3 decimal places"
+	assert (the number of decimal places of 1.23456789) is 8 with "Should return 8 decimal places"
+	assert (the number of decimal places of 1.000000000000001) is 15 with "Should return 15 decimal places
+	assert (the number of decimal places of 1.0000000000) is not set with "Should return null for trailing zeros"
+	assert (the number of decimal places of 1) is not set with "Should return null for no decimal number"