Convert several files to pure Objective-C

FossilOrigin-Name: eac9e3d9480c641e752bce15f24de48bbb77705cd44ef2bb9a04603ca04c67e1

src/Variable.m

@@ -0,0 +1,72 @@
+#import "Variable.h"
+
+#include "cube.h"
+
+@implementation Variable
++ (instancetype)variableWithName:(OFString *)name
+                             min:(int)min
+                             max:(int)max
+                         storage:(int *)storage
+                        function:(void (*__cdecl)())function
+                       persisted:(bool)persisted
+{
+	return [[self alloc] initWithName:name
+	                              min:min
+	                              max:max
+	                          storage:storage
+	                         function:function
+	                        persisted:persisted];
+}
+
+- (instancetype)initWithName:(OFString *)name
+                         min:(int)min
+                         max:(int)max
+                     storage:(int *)storage
+                    function:(void (*__cdecl)())function
+                   persisted:(bool)persisted
+{
+	self = [super initWithName:name];
+
+	_min = min;
+	_max = max;
+	_storage = storage;
+	_function = function;
+	_persisted = persisted;
+
+	return self;
+}
+
+- (void)printValue
+{
+	conoutf(@"%@ = %d", self.name, *_storage);
+}
+
+- (void)setValue:(int)value
+{
+	bool outOfRange = false;
+
+	if (_min > _max) {
+		conoutf(@"variable is read-only");
+		return;
+	}
+
+	if (value < _min) {
+		value = _min;
+		outOfRange = true;
+	}
+
+	if (value > _max) {
+		value = _max;
+		outOfRange = true;
+	}
+
+	if (outOfRange)
+		conoutf(@"valid range for %@ is %d..%d", self.name, _min, _max);
+
+	*_storage = value;
+
+	if (_function != NULL)
+		// call trigger function if available
+		_function();
+}
+@end