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Copy pathUndo.c
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671 lines (614 loc) · 18.3 KB
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#define _GNU_SOURCE
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "Prototypes.h"
//#needs Object
#include "md5.h"
#define DIT_UNDO_MAGIC "XDIT2"
/*{
typedef enum UndoActionKind_ {
UndoBreak,
UndoJoinNext,
UndoBackwardDeleteChar,
UndoDeleteChar,
UndoInsertChar,
UndoDeleteBlock,
UndoInsertBlock,
UndoIndent,
UndoUnindent,
UndoBeginGroup,
UndoEndGroup,
UndoDiskState
} UndoActionKind;
struct UndoActionClass_ {
ObjectClass super;
};
struct UndoAction_ {
Object super;
UndoActionKind kind;
int x;
int y;
union {
wchar_t ch;
struct {
char* fileName;
char* md5;
} diskState;
struct {
Text text;
struct {
int xTo;
int yTo;
} coord;
} block;
int size;
struct {
int* buf;
int len;
int size;
} tab;
bool backspace;
} data;
};
extern UndoActionClass UndoActionType;
struct Undo_ {
List* list;
Stack* actions;
Stack* redoActions;
int group;
};
}*/
#ifndef MIN
#define MIN(a,b) ((a)<(b)?(a):(b))
#endif
UndoActionClass UndoActionType = {
.super = {
.size = sizeof(UndoAction),
.delete = UndoAction_delete
}
};
inline UndoAction* UndoAction_new(UndoActionKind kind, int x, int y) {
UndoAction* this = Alloc(UndoAction);
this->kind = kind;
this->x = x;
this->y = y;
return this;
}
void UndoAction_delete(Object* cast) {
UndoAction* this = (UndoAction*) cast;
if (this->kind == UndoDeleteBlock || this->kind == UndoInsertBlock) {
Text_prune(&(this->data.block.text));
} else if (this->kind == UndoUnindent || this->kind == UndoIndent) {
free(this->data.tab.buf);
} else if (this->kind == UndoDiskState) {
free(this->data.diskState.fileName);
free(this->data.diskState.md5);
}
free(this);
}
Undo* Undo_new(List* list) {
Undo* this = (Undo*) malloc(sizeof(Undo));
this->list = list;
this->actions = Stack_new(ClassAs(UndoAction, Object), true);
this->redoActions = Stack_new(ClassAs(UndoAction, Object), true);
this->group = 0;
return this;
}
void Undo_delete(Undo* this) {
Stack_delete(this->actions);
Stack_delete(this->redoActions);
free(this);
}
static inline void pushUndo(Undo* this, UndoAction* action) {
Stack_empty(this->redoActions);
Stack_push(this->actions, action);
}
static inline void Undo_char(Undo* this, UndoActionKind kind, int x, int y, wchar_t ch) {
UndoAction* action = UndoAction_new(kind, x, y);
action->data.ch = ch;
pushUndo(this, action);
}
static inline void Undo_block(Undo* this, UndoActionKind kind, int x, int y, Text text) {
assert(len > 0);
UndoAction* action = UndoAction_new(kind, x, y);
action->data.block.text = text;
/* calculate block coordinates */
const char* walk = text.data;
int len = text.bytes;
int yTo = y;
int xTo = 0;
while (walk - text.data < len) {
char* at = memchr(walk, '\n', len - (walk - text.data));
if (at) {
yTo++;
walk = at + 1;
} else {
xTo += Text_chars(Text_new((char*)walk)) + (yTo == y ? x : 0);
break;
}
}
action->data.block.coord.xTo = xTo;
action->data.block.coord.yTo = yTo;
pushUndo(this, action);
}
static inline void Undo_tab(Undo* this, UndoActionKind kind, int x, int y, int* counts, int lines, int size) {
UndoAction* action = UndoAction_new(kind, x, y);
action->data.tab.buf = counts;
action->data.tab.len = lines;
action->data.tab.size = size;
pushUndo(this, action);
}
void Undo_deleteCharAt(Undo* this, int x, int y, wchar_t ch) {
Undo_char(this, UndoDeleteChar, x, y, ch);
}
void Undo_backwardDeleteCharAt(Undo* this, int x, int y, wchar_t ch) {
Undo_char(this, UndoBackwardDeleteChar, x, y, ch);
}
static inline void convertToBlock(UndoAction* top) {
wchar_t first = top->data.ch;
top->kind = UndoInsertBlock;
top->data.block.text = Text_new(strdup(""));
Text_appendChar(&(top->data.block.text), first);
}
static inline void addToBlock(UndoAction* top, int x, int y, wchar_t ch) {
Text_appendChar(&(top->data.block.text), ch);
top->data.block.coord.xTo = x+1;
top->data.block.coord.yTo = y;
}
void Undo_insertCharAt(Undo* this, int x, int y, wchar_t ch) {
UndoAction* top = (UndoAction*) Stack_peek(this->actions);
if (ch == '\t' || !top) { // is this case for '\t' still valid?
Undo_char(this, UndoInsertChar, x, y, ch);
} else if (top->kind == UndoInsertChar && top->y == y && top->x == x-1) {
convertToBlock(top);
addToBlock(top, x, y, ch);
} else if (top->kind == UndoInsertBlock && top->data.block.coord.yTo == y && top->data.block.coord.xTo == x) {
addToBlock(top, x, y, ch);
} else {
Undo_char(this, UndoInsertChar, x, y, ch);
}
}
void Undo_breakAt(Undo* this, int x, int y, int indent) {
UndoAction* action = UndoAction_new(UndoBreak, x, y);
action->data.size = indent;
pushUndo(this, action);
}
void Undo_joinNext(Undo* this, int x, int y, bool backspace) {
UndoAction* action = UndoAction_new(UndoJoinNext, x, y);
action->data.backspace = backspace;
pushUndo(this, action);
}
void Undo_deleteBlock(Undo* this, int x, int y, char* block, int len) {
Undo_block(this, UndoDeleteBlock, x, y, Text_newWithSize(block, len));
}
void Undo_insertBlock(Undo* this, int x, int y, Text text) {
Undo_block(this, UndoInsertBlock, x, y, Text_copy(text));
}
void Undo_indent(Undo* this, int x, int y, int lines, int size) {
int* counts = malloc(sizeof(int) * lines);
for (int i = 0; i < lines; i++) {
counts[i] = size;
}
Undo_tab(this, UndoIndent, x, y, counts, lines, size);
}
void Undo_unindent(Undo* this, int x, int y, int* counts, int lines, int size) {
Undo_tab(this, UndoUnindent, x, y, counts, lines, size);
}
void Undo_beginGroup(Undo* this, int x, int y) {
UndoAction* action = UndoAction_new(UndoBeginGroup, x, y);
pushUndo(this, action);
}
void Undo_endGroup(Undo* this, int x, int y) {
UndoAction* action = UndoAction_new(UndoEndGroup, x, y);
pushUndo(this, action);
}
void Undo_insertBlanks(Undo* this, int x, int y, int len) {
UndoAction* action = UndoAction_new(UndoInsertBlock, x, y);
action->data.block.coord.xTo = x + len;
action->data.block.coord.yTo = y;
pushUndo(this, action);
}
void Undo_diskState(Undo* this, int x, int y, char* md5, char* fileName) {
char md5buffer[32];
if (!fileName)
return;
if (!md5) {
FILE* fd = fopen(fileName, "r");
if (!fd)
return;
md5_stream(fd, md5buffer);
fclose(fd);
md5 = md5buffer;
}
UndoAction* action = UndoAction_new(UndoDiskState, x, y);
action->data.diskState.md5 = malloc(16);
action->data.diskState.fileName = strdup(fileName);
memcpy(action->data.diskState.md5, md5, 16);
Stack_push(this->actions, action);
}
bool Undo_checkDiskState(Undo* this) {
UndoAction* action = (UndoAction*) Stack_peek(this->actions);
if (!action)
return false;
return (action->kind == UndoDiskState);
}
bool Undo_undo(Undo* this, int* x, int* y) {
assert(x); assert(y);
bool modified = true;
UndoAction* action = (UndoAction*) Stack_pop(this->actions);
if (!action)
return false;
*x = action->x;
*y = action->y;
Line* line = (Line*) List_get(this->list, action->y);
switch (action->kind) {
case UndoDiskState:
{
Stack_push(this->redoActions, action);
return Undo_undo(this, x, y);
}
case UndoBeginGroup:
{
this->group++;
break;
}
case UndoEndGroup:
{
this->group--;
break;
}
case UndoBreak:
{
Line_joinNext(line);
if (action->data.size > 0)
Line_deleteChars(line, action->x, action->data.size);
break;
}
case UndoJoinNext:
{
Line_breakAt(line, action->x, 0);
if (action->data.backspace) {
*x = 0;
*y = action->y + 1;
}
break;
}
case UndoBackwardDeleteChar:
{
Line_insertChar(line, action->x, action->data.ch);
*x = action->x + 1;
break;
}
case UndoDeleteChar:
{
Line_insertChar(line, action->x, action->data.ch);
break;
}
case UndoInsertChar:
{
assert(action->data.ch == Line_charAt(line, action->x));
Line_deleteChars(line, action->x, 1);
break;
}
case UndoInsertBlock:
{
int lines = (action->data.block.coord.yTo - action->y) + 1;
StringBuffer_delete(Line_deleteBlock(line, lines, action->x, action->data.block.coord.xTo));
break;
}
case UndoDeleteBlock:
{
int newX, newY;
assert(Text_chars(action->data.block.text) > 0);
Line_insertBlock(line, action->x, action->data.block.text, &newX, &newY);
break;
}
case UndoIndent:
{
int* lines = Line_unindent(line, action->data.tab.len, action->data.tab.size);
free(lines);
break;
}
case UndoUnindent:
{
for (int i = 0; i < action->data.tab.len; i++) {
for (int j = 0; j < action->data.tab.buf[i]; j++)
Line_insertChar(line, 0, action->data.tab.size == 0 ? '\t' : ' ');
line = (Line*) line->super.next;
assert(line);
}
break;
}
}
Stack_push(this->redoActions, action);
action = (UndoAction*) Stack_peek(this->actions);
if (action && action->kind == UndoDiskState && action->data.diskState.fileName) {
FILE* fd = fopen(action->data.diskState.fileName, "r");
if (fd) {
char md5[32];
md5_stream(fd, md5);
fclose(fd);
if (memcmp(md5, action->data.diskState.md5, 16) == 0)
modified = false;
}
}
if (this->group)
return Undo_undo(this, x, y);
return modified;
}
bool Undo_redo(Undo* this, int* x, int* y) {
assert(x); assert(y);
bool modified = true;
UndoAction* action = (UndoAction*) Stack_pop(this->redoActions);
if (!action)
return false;
*x = action->x;
*y = action->y;
Line* line = (Line*) List_get(this->list, action->y);
switch (action->kind) {
case UndoDiskState:
{
Stack_push(this->actions, action);
return Undo_redo(this, x, y);
}
case UndoBeginGroup:
{
this->group--;
break;
}
case UndoEndGroup:
{
this->group++;
break;
}
case UndoBreak:
{
Line_breakAt(line, action->x, action->data.size);
*y = action->y + 1;
*x = action->data.size;
break;
}
case UndoJoinNext:
{
Line_joinNext(line);
break;
}
case UndoBackwardDeleteChar:
{
Line_deleteChars(line, action->x, 1);
break;
}
case UndoDeleteChar:
{
Line_deleteChars(line, action->x, 1);
break;
}
case UndoInsertChar:
{
Line_insertChar(line, action->x, action->data.ch);
*x = action->x + 1;
break;
}
case UndoInsertBlock:
{
int newX, newY;
if (Text_chars(action->data.block.text) > 0) {
Line_insertBlock(line, action->x, action->data.block.text, &newX, &newY);
*x = action->data.block.coord.xTo;
*y = action->data.block.coord.yTo;
}
break;
}
case UndoDeleteBlock:
{
int lines = (action->data.block.coord.yTo - action->y) + 1;
StringBuffer_delete(Line_deleteBlock(line, lines, action->x, action->data.block.coord.xTo));
break;
}
case UndoIndent:
{
for (int i = 0; i < action->data.tab.len; i++) {
for (int j = 0; j < action->data.tab.buf[i]; j++)
Line_insertChar(line, 0, action->data.tab.size == 0 ? '\t' : ' ');
line = (Line*) line->super.next;
assert(line);
}
*x = action->x + (action->data.tab.size == 0 ? 1 : action->data.tab.size);
break;
}
case UndoUnindent:
{
int* lines = Line_unindent(line, action->data.tab.len, action->data.tab.size);
free(lines);
*x = action->x - (action->data.tab.size == 0 ? 1 : action->data.tab.size);
break;
}
}
Stack_push(this->actions, action);
action = (UndoAction*) Stack_peek(this->actions);
if (action && action->kind == UndoDiskState && action->data.diskState.fileName) {
FILE* fd = fopen(action->data.diskState.fileName, "r");
if (fd) {
char md5[32];
md5_stream(fd, md5);
fclose(fd);
if (memcmp(md5, action->data.diskState.md5, 16) == 0)
modified = false;
}
}
if (this->group)
return Undo_redo(this, x, y);
return modified;
}
static void storeStack(FILE* ufd, Stack* stack) {
int items = stack->size;
items = MIN(items, 1000);
fwrite(&items, sizeof(int), 1, ufd);
for (int i = items - 1; i >= 0; i--) {
UndoAction* action = (UndoAction*) Stack_peekAt(stack, i);
fwrite(&action->kind, sizeof(UndoActionKind), 1, ufd);
fwrite(&action->x, sizeof(int), 1, ufd);
fwrite(&action->y, sizeof(int), 1, ufd);
switch(action->kind) {
case UndoBeginGroup:
case UndoEndGroup:
case UndoDiskState:
break;
case UndoBreak:
fwrite(&action->data.size, sizeof(int), 1, ufd);
break;
case UndoJoinNext:
fwrite(&action->data.backspace, sizeof(bool), 1, ufd);
break;
case UndoBackwardDeleteChar:
case UndoDeleteChar:
case UndoInsertChar:
fwrite(&action->data.ch, sizeof(wchar_t), 1, ufd);
break;
case UndoInsertBlock:
case UndoDeleteBlock:
assert(Text_chars(action->data.block.text) > 0);
fwrite(&(Text_bytes(action->data.block.text)), sizeof(int), 1, ufd);
fwrite(Text_toString(action->data.block.text), sizeof(char), Text_bytes(action->data.block.text), ufd);
fwrite(&action->data.block.coord.xTo, sizeof(int), 1, ufd);
fwrite(&action->data.block.coord.yTo, sizeof(int), 1, ufd);
break;
case UndoIndent:
case UndoUnindent:
fwrite(&action->data.tab.len, sizeof(int), 1, ufd);
fwrite(action->data.tab.buf, sizeof(int), action->data.tab.len, ufd);
fwrite(&action->data.tab.size, sizeof(bool), 1, ufd);
break;
}
}
}
static inline void getXY(Stack* stack, int* x, int* y) {
*x = -1;
*y = -1;
UndoAction* action = Stack_peek(stack);
if (action) {
*x = action->x;
*y = action->y;
}
assert(*x != -1 && *y != -1);
}
void Undo_store(Undo* this, char* fileName) {
char* undoFileName = Files_encodePathAsFileName(fileName);
FILE* fd = fopen(fileName, "r");
char md5buf[32];
md5_stream(fd, &md5buf);
fclose(fd);
FILE* ufd = Files_openHome("w", "undo/%s", undoFileName);
free(undoFileName);
if (!ufd)
return;
char* magic = DIT_UNDO_MAGIC;
fwrite(magic, 5, 1, ufd);
fwrite(md5buf, 16, 1, ufd);
if (Undo_checkDiskState(this))
UndoAction_delete(Stack_pop(this->actions));
storeStack(ufd, this->actions);
storeStack(ufd, this->redoActions);
int x, y;
getXY(this->actions, &x, &y);
Undo_diskState(this, x, y, NULL, fileName);
fclose(ufd);
}
void restoreStack(FILE* ufd, Stack* stack) {
int items;
int read = fread(&items, sizeof(int), 1, ufd);
if (read < 1) { fclose(ufd); return; }
int x, y;
for (int i = items - 1; i >= 0; i--) {
UndoActionKind kind;
read = fread(&kind, sizeof(UndoActionKind), 1, ufd);
if (read < 1) { fclose(ufd); return; }
read = fread(&x, sizeof(int), 1, ufd);
if (read < 1) { fclose(ufd); return; }
read = fread(&y, sizeof(int), 1, ufd);
if (read < 1) { fclose(ufd); return; }
UndoAction* action = UndoAction_new(kind, x, y);
switch(action->kind) {
case UndoBeginGroup:
case UndoEndGroup:
break;
case UndoDiskState:
action->data.diskState.fileName = NULL;
action->data.diskState.md5 = NULL;
break;
case UndoBreak:
read = fread(&action->data.size, sizeof(int), 1, ufd);
if (read < 1) { fclose(ufd); return; }
break;
case UndoJoinNext:
read = fread(&action->data.backspace, sizeof(bool), 1, ufd);
if (read < 1) { fclose(ufd); return; }
break;
case UndoBackwardDeleteChar:
case UndoDeleteChar:
case UndoInsertChar:
read = fread(&action->data.ch, sizeof(wchar_t), 1, ufd);
if (read < 1) { fclose(ufd); return; }
break;
case UndoInsertBlock:
case UndoDeleteBlock:
{
int len;
read = fread(&len, sizeof(int), 1, ufd);
if (read < 1) { fclose(ufd); return; }
char* buf = malloc(sizeof(char) * (len + 1));
read = fread(buf, sizeof(char), len, ufd);
buf[len] = '\0';
if (read < len) { fclose(ufd); return; }
action->data.block.text = Text_newWithSize(buf, len);
read = fread(&action->data.block.coord.xTo, sizeof(int), 1, ufd);
if (read < 1) { fclose(ufd); return; }
read = fread(&action->data.block.coord.yTo, sizeof(int), 1, ufd);
if (read < 1) { fclose(ufd); return; }
break;
}
case UndoIndent:
case UndoUnindent:
read = fread(&action->data.tab.len, sizeof(int), 1, ufd);
if (read < 1) { fclose(ufd); return; }
action->data.tab.buf = malloc(sizeof(int) * action->data.tab.len);
read = fread(action->data.tab.buf, sizeof(int), action->data.tab.len, ufd);
if (read < action->data.tab.len) { fclose(ufd); return; }
read = fread(&action->data.tab.size, sizeof(bool), 1, ufd);
if (read < 1) { fclose(ufd); return; }
break;
}
Stack_push(stack, action);
}
}
void Undo_restore(Undo* this, char* fileName) {
FILE* fd = fopen(fileName, "r");
if (!fd)
return;
char* undoFileName = Files_encodePathAsFileName(fileName);
char md5curr[32], md5saved[32];
md5_stream(fd, md5curr);
fclose(fd);
FILE* ufd = Files_openHome("r", "undo/%s", undoFileName);
free(undoFileName);
if (!ufd)
return;
char magic[6]; magic[5] = '\0';
int read = fread(magic, 5, 1, ufd);
if (read < 1) { fclose(ufd); return; }
if (strcmp(magic, DIT_UNDO_MAGIC) != 0) { fclose(ufd); return; }
read = fread(md5saved, 16, 1, ufd);
if (read < 1) { fclose(ufd); return; }
if (memcmp(md5curr, md5saved, 16) != 0) {
fclose(ufd);
return;
}
restoreStack(ufd, this->actions);
restoreStack(ufd, this->redoActions);
int x, y;
getXY(this->actions, &x, &y);
Undo_diskState(this, x, y, md5curr, fileName);
assert(Undo_checkDiskState(this));
fclose(ufd);
}