From 9372b51357e6179935339691f36e811b84934e8b Mon Sep 17 00:00:00 2001
From: Jonathan Bradley <jcb@pikum.xyz>
Date: Wed, 30 Aug 2023 22:00:54 -0400
Subject: first pass add events

---
 src/event.cpp | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/event.hpp | 17 +++++++++++++++++
 2 files changed, 74 insertions(+)
 create mode 100644 src/event.cpp
 create mode 100644 src/event.hpp

(limited to 'src')

diff --git a/src/event.cpp b/src/event.cpp
new file mode 100644
index 0000000..4683f0e
--- /dev/null
+++ b/src/event.cpp
@@ -0,0 +1,57 @@
+
+#include "event.hpp"
+
+struct EventBucket {
+	char name[16] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+	DynArray<EventHandler> callbacks{8};
+};
+DynArray<EventBucket> eventBuckets{4};
+
+void EventBucketFind(const char *name, char *safeName, EventBucket*& bkt) {
+	assert(strlen(name) <= 16);
+	memset(safeName, '\0', 16);
+	memcpy(safeName, name, strlen(name));
+	for (long i = 0; i < eventBuckets.Count(); ++i) {
+		EventBucket *tmpBkt = eventBuckets.GetPtr() + (sizeof(EventBucket) * i);
+		if (strncmp(safeName, tmpBkt->name, 16) == 0) {
+			bkt = tmpBkt;
+			break;
+		}
+	}
+}
+
+void RegisterCallback(const char *name, EventHandler handler) {
+	char safeName[16];
+	EventBucket *bkt = nullptr;
+	EventBucketFind(name, safeName, bkt);
+	if (bkt == nullptr) {
+		eventBuckets.Push(EventBucket{});
+		bkt = eventBuckets.GetPtr() + (sizeof(EventBucket) * (eventBuckets.Count() - 1));
+		memcpy(bkt->name, safeName, 16);
+	}
+	bkt->callbacks.Push(handler);
+}
+
+void UnregisterCallback(const char *name, EventHandler handler) {
+	char safeName[16];
+	EventBucket *bkt = nullptr;
+	EventBucketFind(name, safeName, bkt);
+	if (bkt == nullptr) return;
+	for (uint64_t i = 0; i < bkt->callbacks.Count(); ++i) {
+		if (bkt->callbacks[i] == handler) {
+			bkt->callbacks.Remove(i);
+			break;
+		}
+	}
+}
+
+void DispatchCabllack(const char *name) {
+	char safeName[16];
+	EventBucket *bkt = nullptr;
+	EventBucketFind(name, safeName, bkt);
+	if (bkt == nullptr) return;
+	for (long i = 0; i < bkt->callbacks.Count(); ++i) {
+		bkt->callbacks[i]();
+	}
+}
+
diff --git a/src/event.hpp b/src/event.hpp
new file mode 100644
index 0000000..505d82a
--- /dev/null
+++ b/src/event.hpp
@@ -0,0 +1,17 @@
+#ifndef PKE_EVENT_HPP
+#define PKE_EVENT_HPP
+
+#include "macros.hpp"
+#include "dynamic-array.hpp"
+
+#include <cassert>
+#include <cstdint>
+#include <cstring>
+
+typedef void (*EventHandler)();
+
+void RegisterCallback(const char *name, EventHandler handler);
+void UnregisterCallback(const char *name, EventHandler handler);
+void DispatchCabllack(const char *name);
+
+#endif /* PKE_EVENT_HPP */
-- 
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