Merge pull request #9 from LunarClient/add-sign-function

src/main/java/com/eliotlash/molang/functions/classic/Sign.java

@@ -0,0 +1,25 @@
+package com.eliotlash.molang.functions.classic;
+
+import com.eliotlash.molang.ast.Expr;
+import com.eliotlash.molang.functions.Function;
+import com.eliotlash.molang.variables.ExecutionContext;
+
+/**
+ * Absolute value function
+ */
+public class Sign extends Function {
+
+    public Sign(String name) {
+        super(name);
+    }
+
+    @Override
+    public int getRequiredArguments() {
+        return 1;
+    }
+
+    @Override
+    public double _evaluate(Expr[] arguments, ExecutionContext ctx) {
+        return Math.signum(this.evaluateArgument(arguments, ctx, 0));
+    }
+}

src/main/java/com/eliotlash/molang/variables/ExecutionContext.java

@@ -139,6 +139,7 @@ private static void addFunction(Map<FunctionDefinition, Function> map, String ta
         addFunction(map, "math", new Cos("cosradians"));
         addFunction(map, "math", new SinDegrees("sin"));
         addFunction(map, "math", new Sin("sinradians"));
+        addFunction(map, "math", new Sign("sign"));
         addFunction(map, "math", new Asin("asin"));
         addFunction(map, "math", new Acos("acos"));
         addFunction(map, "math", new Atan("atan"));