Returning from calls 10.5.1

src/jlox/loxfunction.d

@@ -0,0 +1,28 @@
+module jlox.loxfunction;
+
+import std.conv;
+
+import jlox.token;
+import jlox.stmt;
+import jlox.interpreter;
+import jlox.environment;
+import jlox.util;
+
+class LoxFunction : LoxCallable{
+	private Stmt.Function declaration;
+	mixin defaultCtor;
+	
+	int arity() => declaration.params.length.to!int;
+	TValue call(Interpreter interpreter, TValue[] arguments){
+		Environment environment = new Environment(interpreter.globals);
+		foreach(i; 0 .. declaration.params.length)
+			environment.define(declaration.params[i].lexeme, arguments[i]);
+		try{
+			interpreter.executeBlock(declaration.body, environment);
+		} catch(Return returnValue){
+			return returnValue.value;
+		}
+		return TValue.nil(tvalueNil);
+	}
+}
+