#define UNDOLEVELS 500
#define UNDO_KEY_INTERVAL 100
-// The undo stack is a series of key undo buffers and
-// incremental undo buffers. The incremental buffers
-// store the differences in the most compact way possible:
-// a series of offsets, sizes and values. This should allow
-// a huge number of undo updates.
+
+#define hash_sz2 8
+#define hash_sz (1<<hash_sz2)
+#define hash_sz1 (hash_sz-1)
+#define va 0
+#define vb 1
+
+class UndoHash
+{
+public:
+ UndoHash(char *txt, int len, UndoHash *nxt);
+ ~UndoHash();
+
+ UndoHash *nxt;
+ char *txt; int len;
+ int line[2], occurs[2];
+};
+
+class UndoHashTable
+{
+public:
+ UndoHashTable();
+ ~UndoHashTable();
+ UndoHash *add(char *txt, int len);
+
+ UndoHash *table[hash_sz];
+ UndoHash *bof, *eof;
+};
+
+class UndoLine
+{
+public:
+ UndoLine(UndoHash *hash, char *tp);
+ UndoLine(UndoHashTable *hash, char *txt, int len);
+ ~UndoLine();
+ int eq(UndoLine *ln);
+
+ char *txt; int len;
+ UndoHash *hash;
+};
+
+class UndoVersion : public ArrayList<UndoLine *>
+{
+public:
+ UndoVersion(int v) { ver = v; }
+ ~UndoVersion() { remove_all_objects(); }
+ int ver;
+
+ void scan_lines(UndoHashTable *hash, char *sp, char *ep);
+};
class UndoStackItem : public ListItem<UndoStackItem>
// The string must be deleted by the user.
char* get_data();
char* get_filename();
- int has_data();
int get_size();
int is_key();
uint64_t get_flags();
-
-// Get pointer to incremental data for use in an apply_difference command.
- char* get_incremental_data();
- int get_incremental_size();
-
void set_creator(void *creator);
void* get_creator();
+ void save(FILE *fp);
+ void load(FILE *fp);
private:
// command description for the menu item
char *description;
// move to the next undo entry for a redo
UndoStackItem* pull_next();
+ void save(FILE *fp);
+ void load(FILE *fp);
void dump(FILE *fp=stdout);
UndoStackItem* current;