From d8a316514c03d85b771a9dce4a8a51b875d955b3 Mon Sep 17 00:00:00 2001
From: Robin Haberkorn <robin.haberkorn@googlemail.com>
Date: Tue, 4 Dec 2012 17:29:01 +0100
Subject: autoconf preparation: move everything into src/ subdir

---
 src/undo.h | 134 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 src/undo.h

(limited to 'src/undo.h')

diff --git a/src/undo.h b/src/undo.h
new file mode 100644
index 0000000..43692e9
--- /dev/null
+++ b/src/undo.h
@@ -0,0 +1,134 @@
+#ifndef __UNDO_H
+#define __UNDO_H
+
+#include <bsd/sys/queue.h>
+
+#include <glib.h>
+#include <glib/gprintf.h>
+
+#include <Scintilla.h>
+
+#ifdef DEBUG
+#include "parser.h"
+#endif
+
+class UndoToken {
+public:
+	SLIST_ENTRY(UndoToken) tokens;
+
+	gint pos;
+
+	virtual ~UndoToken() {}
+
+	virtual void run() = 0;
+};
+
+class UndoTokenMessage : public UndoToken {
+	unsigned int iMessage;
+	uptr_t wParam;
+	sptr_t lParam;
+
+public:
+	UndoTokenMessage(unsigned int _iMessage,
+			 uptr_t _wParam = 0, sptr_t _lParam = 0)
+			: UndoToken(), iMessage(_iMessage),
+			  wParam(_wParam), lParam(_lParam) {}
+
+	void run(void);
+};
+
+template <typename Type>
+class UndoTokenVariable : public UndoToken {
+	Type *ptr;
+	Type value;
+
+public:
+	UndoTokenVariable(Type &variable, Type _value)
+			 : UndoToken(), ptr(&variable), value(_value) {}
+
+	void
+	run(void)
+	{
+#ifdef DEBUG
+		if ((State **)ptr == &States::current)
+			g_printf("undo state -> %p\n", (void *)value);
+#endif
+		*ptr = value;
+	}
+};
+
+class UndoTokenString : public UndoToken {
+	gchar **ptr;
+	gchar *str;
+
+public:
+	UndoTokenString(gchar *&variable, gchar *_str)
+		       : UndoToken(), ptr(&variable)
+	{
+		str = _str ? g_strdup(_str) : NULL;
+	}
+
+	~UndoTokenString()
+	{
+		g_free(str);
+	}
+
+	void
+	run(void)
+	{
+		g_free(*ptr);
+		*ptr = str;
+		str = NULL;
+	}
+};
+
+extern class UndoStack {
+	SLIST_HEAD(Head, UndoToken) head;
+
+public:
+	bool enabled;
+
+	UndoStack(bool _enabled = false) : enabled(_enabled)
+	{
+		SLIST_INIT(&head);
+	}
+	~UndoStack();
+
+	void push(UndoToken *token);
+
+	void push_msg(unsigned int iMessage,
+		      uptr_t wParam = 0, sptr_t lParam = 0);
+
+	template <typename Type>
+	inline Type &
+	push_var(Type &variable, Type value)
+	{
+		push(new UndoTokenVariable<Type>(variable, value));
+		return variable;
+	}
+
+	template <typename Type>
+	inline Type &
+	push_var(Type &variable)
+	{
+		return push_var<Type>(variable, variable);
+	}
+
+	inline gchar *&
+	push_str(gchar *&variable, gchar *str)
+	{
+		push(new UndoTokenString(variable, str));
+		return variable;
+	}
+	inline gchar *&
+	push_str(gchar *&variable)
+	{
+		return push_str(variable, variable);
+	}
+
+	void pop(gint pos);
+
+	void clear(void);
+} undo;
+
+#endif
\ No newline at end of file
-- 
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