LSP integration steps 1-4, part of 5.

lsp/BufferChangeTracker.cc

@@ -0,0 +1,49 @@
+/*
+ * BufferChangeTracker.cc - minimal initial implementation
+ */
+#include "BufferChangeTracker.h"
+#include "../Buffer.h"
+
+namespace kte::lsp {
+BufferChangeTracker::BufferChangeTracker(const Buffer *buffer)
+	: buffer_(buffer) {}
+
+
+void
+BufferChangeTracker::recordInsertion(int /*row*/, int /*col*/, const std::string &/*text*/)
+{
+	// For Phase 1–2 bring-up, coalesce to full-document changes
+	fullChangePending_ = true;
+	++version_;
+}
+
+
+void
+BufferChangeTracker::recordDeletion(int /*row*/, int /*col*/, std::size_t /*len*/)
+{
+	fullChangePending_ = true;
+	++version_;
+}
+
+
+std::vector<TextDocumentContentChangeEvent>
+BufferChangeTracker::getChanges() const
+{
+	std::vector<TextDocumentContentChangeEvent> v;
+	if (!buffer_)
+		return v;
+	if (fullChangePending_) {
+		TextDocumentContentChangeEvent ev;
+		ev.text = buffer_->FullText();
+		v.push_back(std::move(ev));
+	}
+	return v;
+}
+
+
+void
+BufferChangeTracker::clearChanges()
+{
+	fullChangePending_ = false;
+}
+} // namespace kte::lsp