LSP integration steps 1-4, part of 5.

Buffer.h

@@ -17,11 +17,20 @@
 #include "HighlighterEngine.h"
 #include "Highlight.h"
 
+// Forward declarations to avoid heavy includes
+namespace kte {
+namespace lsp {
+class BufferChangeTracker;
+}
+}
+
 
 class Buffer {
 public:
 	Buffer();
 
+	~Buffer();
+
 	Buffer(const Buffer &other);
 
 	Buffer &operator=(const Buffer &other);
@@ -374,23 +383,59 @@ public:
 
 	[[nodiscard]] std::string AsString() const;
 
+	// Compose full text of this buffer with newlines between rows
+	[[nodiscard]] std::string FullText() const;
+
 	// Syntax highlighting integration (per-buffer)
-	[[nodiscard]] std::uint64_t Version() const { return version_; }
+	[[nodiscard]] std::uint64_t Version() const
+	{
+		return version_;
+	}
 
-	void SetSyntaxEnabled(bool on) { syntax_enabled_ = on; }
-	[[nodiscard]] bool SyntaxEnabled() const { return syntax_enabled_; }
 
-	void SetFiletype(const std::string &ft) { filetype_ = ft; }
-	[[nodiscard]] const std::string &Filetype() const { return filetype_; }
+	void SetSyntaxEnabled(bool on)
+	{
+		syntax_enabled_ = on;
+	}
+
+
+	[[nodiscard]] bool SyntaxEnabled() const
+	{
+		return syntax_enabled_;
+	}
+
+
+	void SetFiletype(const std::string &ft)
+	{
+		filetype_ = ft;
+	}
+
+
+	[[nodiscard]] const std::string &Filetype() const
+	{
+		return filetype_;
+	}
+
+
+	kte::HighlighterEngine *Highlighter()
+	{
+		return highlighter_.get();
+	}
+
+
+	const kte::HighlighterEngine *Highlighter() const
+	{
+		return highlighter_.get();
+	}
 
-	kte::HighlighterEngine *Highlighter() { return highlighter_.get(); }
-	const kte::HighlighterEngine *Highlighter() const { return highlighter_.get(); }
 
 	void EnsureHighlighter()
 	{
-		if (!highlighter_) highlighter_ = std::make_unique<kte::HighlighterEngine>();
+		if (!highlighter_)
+			highlighter_ = std::make_unique<kte::HighlighterEngine>();
 	}
 
+
 	// Raw, low-level editing APIs used by UndoSystem apply().
 	// These must NOT trigger undo recording. They also do not move the cursor.
 	void insert_text(int row, int col, std::string_view text);
@@ -410,6 +455,11 @@ public:
 
 	[[nodiscard]] const UndoSystem *Undo() const;
 
+	// LSP integration: optional change tracker
+	void SetChangeTracker(std::unique_ptr<kte::lsp::BufferChangeTracker> tracker);
+
+	kte::lsp::BufferChangeTracker *GetChangeTracker();
+
 private:
 	// State mirroring original C struct (without undo_tree)
 	std::size_t curx_    = 0, cury_ = 0; // cursor position in characters
@@ -430,9 +480,12 @@ private:
 
 	// Syntax/highlighting state
 	std::uint64_t version_ = 0; // increment on edits
- bool syntax_enabled_    = true;
+	bool syntax_enabled_   = true;
 	std::string filetype_;
 	std::unique_ptr<kte::HighlighterEngine> highlighter_;
+
+	// Optional LSP change tracker (absent by default)
+	std::unique_ptr<kte::lsp::BufferChangeTracker> change_tracker_;
 };
 
-#endif // KTE_BUFFER_H
+#endif // KTE_BUFFER_H