fix memory leak and implement stub front end

1 files changed, 57 insertions, 0 deletions

diff --git a/src/frontend/stub.zig b/src/frontend/stub.zig
new file mode 100644
index 0000000..d6e7fc8
--- /dev/null
+++ b/src/frontend/stub.zig
@@ -0,0 +1,57 @@
+const std = @import("std");
+const Action = @import("../actions.zig").Action;
+const IOInterface = @import("io_interface.zig").IOInterface;
+
+pub const ActionStack = struct {
+    stream: std.ArrayList(Action),
+
+    pub fn init(allocator: std.mem.Allocator) ActionStack {
+        return ActionStack{
+            .stream = std.ArrayList(Action).init(allocator),
+        };
+    }
+
+    pub fn deinit(self: *ActionStack) void {
+        self.stream.deinit();
+    }
+
+    pub fn scheduleAction(self: *ActionStack, action: Action) !void {
+        try self.stream.append(action);
+    }
+
+    pub fn next(self: *ActionStack) ?Action {
+        return self.stream.popOrNull();
+    }
+};
+
+pub const IO = struct {
+    allocator: std.mem.Allocator,
+    as: ActionStack,
+    out_as: ActionStack,
+
+    pub fn displayMessage(self: *IO, str: []const u8) anyerror!void {
+        _ = self;
+        std.log.info("{s}\n", .{str});
+    }
+
+    pub fn waitForTick(self: *IO) anyerror!Action {
+        const a = self.as.next() orelse return error.NoAvailableAction;
+
+        try self.out_as.scheduleAction(a);
+
+        return a;
+    }
+
+    pub fn init(allocator: std.mem.Allocator, as: ActionStack) !IOInterface {
+        var io = try allocator.create(IO);
+        io.allocator = allocator;
+        io.as = as;
+        io.out_as = ActionStack.init(allocator);
+        return IOInterface.init(io);
+    }
+
+    pub fn deinit(self: *IO) void {
+        self.out_as.deinit();
+        self.allocator.destroy(self);
+    }
+};