4coder/buffer/4coder_golden_array.cpp

230 lines
5.8 KiB
C++

/*
* Mr. 4th Dimention - Allen Webster
* Four Tech
*
* public domain -- no warranty is offered or implied; use this code at your own risk
*
* 16.10.2015
*
* Buffer data object
* type - Golden Array
*
*/
// TOP
typedef struct{
char *data;
int size, max;
int *line_starts;
float *line_widths;
int line_count;
int line_max;
int widths_max;
} Buffer;
inline_4tech int
buffer_size(Buffer *buffer){
return buffer->size;
}
internal_4tech void
buffer_initialize(Buffer *buffer, char *data, int size){
assert_4tech(size <= buffer->max);
buffer->size = eol_convert_in(buffer->data, data, size);
}
internal_4tech void*
buffer_relocate(Buffer *buffer, char *new_data, int new_max){
void *result;
assert_4tech(new_max >= buffer->size);
result = buffer->data;
memcpy_4tech(new_data, buffer->data, buffer->size);
buffer->data = new_data;
buffer->max = new_max;
return(result);
}
typedef struct{
Buffer *buffer;
char *data, *end;
int absolute_pos;
int size;
int page_size;
} Buffer_Stringify_Loop;
inline_4tech Buffer_Stringify_Loop
buffer_stringify_loop(Buffer *buffer, int start, int end, int page_size){
Buffer_Stringify_Loop result;
if (0 <= start && start < end && end <= buffer->size){
result.buffer = buffer;
result.absolute_pos = start;
result.data = buffer->data + start;
result.size = end - start;
result.end = buffer->data + end;
result.page_size = page_size;
if (result.size > page_size) result.size = page_size;
}
else result.buffer = 0;
return(result);
}
inline_4tech int
buffer_stringify_good(Buffer_Stringify_Loop *loop){
int result;
result = (loop->buffer != 0);
return(result);
}
inline_4tech void
buffer_stringify_next(Buffer_Stringify_Loop *loop){
if (loop->data + loop->size == loop->end) loop->buffer = 0;
else{
loop->data += loop->page_size;
loop->absolute_pos += loop->page_size;
loop->size = (int)(loop->end - loop->data);
if (loop->size > loop->page_size) loop->size = loop->page_size;
}
}
typedef struct{
Buffer *buffer;
char *data, *end;
int absolute_pos;
int size;
int page_size;
} Buffer_Backify_Loop;
inline_4tech Buffer_Backify_Loop
buffer_backify_loop(Buffer *buffer, int start, int end, int page_size){
Buffer_Backify_Loop result;
++start;
if (0 <= end && end < start && start <= buffer->size){
result.buffer = buffer;
result.end = buffer->data + end;
result.page_size = page_size;
result.size = start - end;
if (result.size > page_size) result.size = page_size;
result.absolute_pos = start - result.size;
result.data = buffer->data + result.absolute_pos;
}
else result.buffer = 0;
return(result);
}
inline_4tech int
buffer_backify_good(Buffer_Backify_Loop *loop){
int result;
result = (loop->buffer != 0);
return(result);
}
inline_4tech void
buffer_backify_next(Buffer_Backify_Loop *loop){
char *old_data;
if (loop->data == loop->end) loop->buffer = 0;
else{
old_data = loop->data;
loop->data -= loop->page_size;
loop->absolute_pos -= loop->page_size;
if (loop->data < loop->end){
loop->size = (int)(old_data - loop->end);
loop->data = loop->end;
loop->absolute_pos = 0;
}
}
}
internal_4tech int
buffer_replace_range(Buffer *buffer, int start, int end, char *str, int len, int *shift_amount){
char *data;
int result;
int size;
size = buffer_size(buffer);
assert_4tech(0 <= start);
assert_4tech(start <= end);
assert_4tech(end <= size);
*shift_amount = (len - (end - start));
if (*shift_amount + size <= buffer->max){
data = (char*)buffer->data;
memmove_4tech(data + end + *shift_amount, data + end, buffer->size - end);
buffer->size += *shift_amount;
data[buffer->size] = 0;
if (len != 0) memcpy_4tech(data + start, str, len);
result = 0;
}
else{
result = *shift_amount + size;
}
return(result);
}
internal_4tech int
buffer_batch_edit_step(Buffer_Batch_State *state, Buffer *buffer, Buffer_Edit *sorted_edits, char *strings, int edit_count){
Buffer_Edit *edit;
int i, result;
int shift_total, shift_amount;
result = 0;
shift_total = state->shift_total;
i = state->i;
edit = sorted_edits + i;
for (; i < edit_count; ++i, ++edit){
result = buffer_replace_range(buffer, edit->start + shift_total, edit->end + shift_total,
strings + edit->str_start, edit->len, &shift_amount);
if (result) break;
shift_total += shift_amount;
}
state->shift_total = shift_total;
state->i = i;
return(result);
}
#if 0
internal_4tech int
buffer_find_hard_start(Buffer *buffer, int line_start, int *all_whitespace, int *all_space,
int *preferred_indent, int tab_width){
char *data;
int size;
int result;
char c;
*all_space = 1;
*preferred_indent = 0;
data = buffer->data;
size = buffer->size;
tab_width -= 1;
for (result = line_start; result < size; ++result){
c = data[result];
if (c == '\n' || c == 0){
*all_whitespace = 1;
break;
}
if (c >= '!' && c <= '~') break;
if (c == '\t') *preferred_indent += tab_width;
if (c != ' ') *all_space = 0;
*preferred_indent += 1;
}
return(result);
}
#endif
// BOTTOM