add expression

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

@@ -0,0 +1,78 @@
+package ch.njol.skript.expressions;
+
+import ch.njol.skript.Skript;
+import ch.njol.skript.doc.Description;
+import ch.njol.skript.doc.Examples;
+import ch.njol.skript.doc.Name;
+import ch.njol.skript.doc.Since;
+import ch.njol.skript.lang.Expression;
+import ch.njol.skript.lang.ExpressionType;
+import ch.njol.skript.lang.SkriptParser.ParseResult;
+import ch.njol.skript.lang.util.SimpleExpression;
+import ch.njol.util.Kleenean;
+import org.bukkit.event.Event;
+import org.jetbrains.annotations.Nullable;
+
+@Name("Angle")
+@Description({
+	"Represents the passed number value in degrees.",
+	"If radians is specified, converts the passed value to degrees. This conversion may not be entirely accurate, " +
+		"due to floating point precision.",
+})
+@Examples({
+	"set {_angle} to 90 degrees",
+	"{_angle} is 90 # true",
+	"180 degrees is pi # true",
+	"pi radians is 180 degrees # true"
+})
+@Since("INSERT VERSION")
+public class ExprAngle extends SimpleExpression<Number> {
+
+	static {
+		Skript.registerExpression(ExprAngle.class, Number.class, ExpressionType.SIMPLE,
+			"%number% [in ]deg[ree][s]",
+			"%number% [in ]rad[ian][s]");
+	}
+
+	private Expression<Number> angle;
+	private boolean isRadians;
+
+	@Override
+	public boolean init(Expression<?>[] expressions, int matchedPattern,
+						Kleenean isDelayed, ParseResult parseResult) {
+		//noinspection unchecked
+		angle = (Expression<Number>) expressions[0];
+		isRadians = matchedPattern == 1;
+		return true;
+	}
+
+	@Override
+	protected Number @Nullable [] get(Event event) {
+		Number number = angle.getSingle(event);
+
+		if (number == null)
+			return null;
+
+		if (isRadians) {
+			return new Double[]{Math.toDegrees(number.doubleValue())};
+		}
+
+		return new Number[]{number};
+	}
+
+	@Override
+	public boolean isSingle() {
+		return true;
+	}
+
+	@Override
+	public Class<? extends Number> getReturnType() {
+		return Number.class;
+	}
+
+	@Override
+	public String toString(@Nullable Event event, boolean debug) {
+		return angle.toString(event, debug) + (isRadians ? " degrees" : " radians");
+	}
+
+}