4coder/buffer/4coder_buffer_abstract.cpp

542 lines
16 KiB
C++
Raw Normal View History

2015-10-24 22:14:33 +00:00
/*
* 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
#if BUFFER_EXPERIMENT_SCALPEL
#define Buffer_Type Buffer
#else
#define Buffer_Type Gap_Buffer
#endif
#define CAT_(a,b) a##b
#define CAT(a,b) CAT_(a,b)
#define Buffer_Stringify_Type CAT(Buffer_Type, _Stringify_Loop)
#define Buffer_Backify_Type CAT(Buffer_Type, _Backify_Loop)
internal_4tech int
buffer_count_newlines(Buffer_Type *buffer, int start, int end){
Buffer_Stringify_Type loop;
int i;
int count;
assert_4tech(0 <= start);
assert_4tech(start <= end);
assert_4tech(end < buffer_size(buffer));
count = 0;
for (loop = buffer_stringify_loop(buffer, start, end, end - start);
buffer_stringify_good(&loop);
buffer_stringify_next(&loop)){
for (i = 0; i < loop.size; ++i){
count += (loop.data[i] == '\n');
}
}
return(count);
}
internal_4tech int
buffer_seek_whitespace_right(Buffer_Type *buffer, int pos){
Buffer_Stringify_Type loop;
char *data;
int end;
int size;
size = buffer_size(buffer);
loop = buffer_stringify_loop(buffer, pos, size, size);
for (;buffer_stringify_good(&loop);
buffer_stringify_next(&loop)){
end = loop.size + loop.absolute_pos;
data = loop.data - loop.absolute_pos;
for (; pos < end && is_whitespace(data[pos]); ++pos);
if (!is_whitespace(data[pos])) break;
}
for (;buffer_stringify_good(&loop);
buffer_stringify_next(&loop)){
end = loop.size + loop.absolute_pos;
data = loop.data - loop.absolute_pos;
for (; pos < end && !is_whitespace(data[pos]); ++pos);
if (is_whitespace(data[pos])) break;
}
return(pos);
}
internal_4tech int
buffer_seek_whitespace_left(Buffer_Type *buffer, int pos){
Buffer_Backify_Type loop;
char *data;
int end;
int size;
size = buffer_size(buffer);
loop = buffer_backify_loop(buffer, pos, 0, size);
for (;buffer_backify_good(&loop);
buffer_backify_next(&loop)){
end = loop.absolute_pos;
data = loop.data - end;
for (; pos > end && is_whitespace(data[pos]); --pos);
if (!is_whitespace(data[pos])) break;
}
for (;buffer_backify_good(&loop);
buffer_backify_next(&loop)){
end = loop.absolute_pos;
data = loop.data - end;
for (; pos > end && !is_whitespace(data[pos]); --pos);
if (is_whitespace(data[pos])) break;
}
return(pos);
}
typedef struct{
int i;
int count;
int start;
} Buffer_Measure_Starts;
internal_4tech int
buffer_measure_starts(Buffer_Measure_Starts *state, Buffer_Type *buffer){
Buffer_Stringify_Type loop;
int *starts;
int max;
char *data;
int size, end;
int start, count, i;
int result;
size = buffer_size(buffer);
starts = buffer->line_starts;
max = buffer->line_max;
result = 0;
i = state->i;
count = state->count;
start = state->start;
for (loop = buffer_stringify_loop(buffer, i, size, size);
buffer_stringify_good(&loop);
buffer_stringify_next(&loop)){
end = loop.size + loop.absolute_pos;
data = loop.data - loop.absolute_pos;
for (; i < end; ++i){
if (data[i] == '\n'){
if (count == max){
result = 1;
goto buffer_measure_starts_end;
}
starts[count++] = start;
start = i + 1;
}
}
}
if (i == size){
starts[count++] = start;
}
buffer_measure_starts_end:
state->i = i;
state->count = count;
state->start = start;
return(result);
}
internal_4tech void
buffer_remeasure_starts(Buffer_Type *buffer, int line_start, int line_end, int line_shift, int text_shift){
Buffer_Stringify_Type loop;
int *starts;
int line_count;
char *data;
int size, end;
int line_i, char_i, start;
starts = buffer->line_starts;
line_count = buffer->line_count;
assert_4tech(0 <= line_start);
assert_4tech(line_start <= line_end);
assert_4tech(line_end < line_count);
assert_4tech(line_count + line_shift <= buffer->line_max);
++line_end;
if (text_shift != 0){
line_i = line_end;
starts += line_i;
for (; line_i < line_count; ++line_i, ++starts){
*starts += text_shift;
}
starts = buffer->line_starts;
}
if (line_shift != 0){
memmove_4tech(starts + line_end + line_shift, starts + line_end,
sizeof(int)*(line_count - line_end));
line_count += line_shift;
}
line_end += line_shift;
size = buffer_size(buffer);
char_i = starts[line_start];
line_i = line_start;
start = char_i;
for (loop = buffer_stringify_loop(buffer, char_i, size, size);
buffer_stringify_good(&loop);
buffer_stringify_next(&loop)){
end = loop.size + loop.absolute_pos;
data = loop.data - loop.absolute_pos;
for (; char_i < end; ++char_i){
if (data[char_i] == '\n'){
starts[line_i++] = start;
start = char_i + 1;
if (line_i >= line_end && start == starts[line_i]) goto buffer_remeasure_starts_end;
}
}
}
if (char_i == size){
starts[line_i++] = start;
}
buffer_remeasure_starts_end:
assert_4tech(line_count >= 1);
buffer->line_count = line_count;
}
internal_4tech void
buffer_remeasure_widths(Buffer_Type *buffer, void *advance_data, int stride,
int line_start, int line_end, int line_shift){
Buffer_Stringify_Type loop;
int *starts;
float *widths;
int line_count;
char *data;
int size, end;
int i, j;
float width;
char ch;
starts = buffer->line_starts;
widths = buffer->line_widths;
line_count = buffer->line_count;
assert_4tech(0 <= line_start);
assert_4tech(line_start <= line_end);
assert_4tech(line_end < line_count);
assert_4tech(line_count <= buffer->widths_max);
++line_end;
if (line_shift != 0){
memmove_4tech(widths + line_end + line_shift, widths + line_end,
sizeof(float)*(line_count - line_end));
}
line_end += line_shift;
i = line_start;
j = starts[i];
if (line_end == line_count) size = buffer_size(buffer);
else size = starts[line_end];
width = 0;
for (loop = buffer_stringify_loop(buffer, j, size, size);
buffer_stringify_good(&loop);
buffer_stringify_next(&loop)){
end = loop.size + loop.absolute_pos;
data = loop.data - loop.absolute_pos;
for (; j < end; ++j){
ch = data[j];
if (ch == '\n'){
widths[i] = width;
++i;
assert_4tech(j + 1 == starts[i]);
width = 0;
}
else{
width += measure_character(advance_data, stride, ch);
}
}
}
}
inline_4tech void
buffer_measure_widths(Buffer_Type *buffer, void *advance_data, int stride){
assert_4tech(buffer->line_count >= 1);
buffer_remeasure_widths(buffer, advance_data, stride, 0, buffer->line_count-1, 0);
}
internal_4tech void
buffer_measure_wrap_y(Buffer_Type *buffer, float *wraps,
float font_height, float max_width){
float *widths;
float y_pos;
int i, line_count;
line_count = buffer->line_count;
widths = buffer->line_widths;
y_pos = 0;
for (i = 0; i < line_count; ++i){
wraps[i] = y_pos;
if (widths[i] == 0) y_pos += font_height;
else y_pos += font_height*ceil_4tech(widths[i]/max_width);
}
}
internal_4tech int
buffer_get_line_index(Buffer_Type *buffer, int pos, int l_bound, int u_bound){
int *lines;
int start, end;
int i;
assert_4tech(0 <= l_bound);
assert_4tech(l_bound <= u_bound);
assert_4tech(u_bound <= buffer->line_count);
lines = buffer->line_starts;
start = l_bound;
end = u_bound;
for (;;){
i = (start + end) >> 1;
if (lines[i] < pos) start = i;
else if (lines[i] > pos) end = i;
else{
start = i;
break;
}
assert_4tech(start < end);
if (start == end - 1) break;
}
return(start);
}
internal_4tech int
buffer_get_line_index_from_wrapped_y(float *wraps, float y, float font_height, int l_bound, int u_bound){
int start, end, i, result;
start = l_bound;
end = u_bound;
for (;;){
i = (start + end) / 2;
if (wraps[i]+font_height <= y) start = i;
else if (wraps[i] > y) end = i;
else{
result = i;
break;
}
if (start >= end - 1){
result = start;
break;
}
}
return(result);
}
inline_4tech Full_Cursor
make_cursor_hint(int line_index, int *starts, float *wrap_ys, float font_height){
Full_Cursor hint;
hint.pos = starts[line_index];
hint.line = line_index + 1;
hint.character = 1;
hint.unwrapped_y = (f32)(line_index * font_height);
hint.unwrapped_x = 0;
hint.wrapped_y = wrap_ys[line_index];
hint.wrapped_x = 0;
return(hint);
}
internal_4tech Full_Cursor
buffer_cursor_from_pos(Buffer_Type *buffer, int pos, float *wraps,
float max_width, float font_height, void *advance_data, int stride){
Full_Cursor result;
int line_index;
line_index = buffer_get_line_index(buffer, pos, 0, buffer->line_count);
result = make_cursor_hint(line_index, buffer->line_starts, wraps, font_height);
result = buffer_cursor_seek(buffer, seek_pos(pos), max_width, font_height,
advance_data, stride, result);
return(result);
}
internal_4tech Full_Cursor
buffer_cursor_from_unwrapped_xy(Buffer_Type *buffer, float x, float y, int round_down, float *wraps,
float max_width, float font_height, void *advance_data, int stride){
Full_Cursor result;
int line_index;
line_index = (int)(y / font_height);
if (line_index >= buffer->line_count) line_index = buffer->line_count - 1;
if (line_index < 0) line_index = 0;
result = make_cursor_hint(line_index, buffer->line_starts, wraps, font_height);
result = buffer_cursor_seek(buffer, seek_unwrapped_xy(x, y, round_down), max_width, font_height,
advance_data, stride, result);
return(result);
}
internal_4tech Full_Cursor
buffer_cursor_from_wrapped_xy(Buffer_Type *buffer, float x, float y, int round_down, float *wraps,
float max_width, float font_height, void *advance_data, int stride){
Full_Cursor result;
int line_index;
line_index = buffer_get_line_index_from_wrapped_y(wraps, y, font_height, 0, buffer->line_count);
result = make_cursor_hint(line_index, buffer->line_starts, wraps, font_height);
result = buffer_cursor_seek(buffer, seek_wrapped_xy(x, y, round_down), max_width, font_height,
advance_data, stride, result);
return(result);
}
internal_4tech void
buffer_get_render_data(Buffer_Type *buffer, float *wraps, Buffer_Render_Item *items, int max, int *count,
float port_x, float port_y, float scroll_x, float scroll_y, Full_Cursor start_cursor, int wrapped,
float width, float height, void *advance_data, int stride, float font_height){
Buffer_Stringify_Type loop;
Buffer_Render_Item *item;
char *data;
int size, end;
float shift_x, shift_y;
float x, y;
int i, item_i;
float ch_width, ch_width_sub;
char ch;
size = buffer_size(buffer);
shift_x = port_x - scroll_x;
shift_y = port_y - scroll_y;
if (wrapped) shift_y += start_cursor.wrapped_y;
else shift_y += start_cursor.unwrapped_y;
x = shift_x;
y = shift_y;
item_i = 0;
item = items + item_i;
for (loop = buffer_stringify_loop(buffer, start_cursor.pos, size, size);
buffer_stringify_good(&loop);
buffer_stringify_next(&loop)){
end = loop.size + loop.absolute_pos;
data = loop.data - loop.absolute_pos;
for (i = loop.absolute_pos; i < end; ++i){
ch = data[i];
ch_width = measure_character(advance_data, stride, ch);
if (ch_width + x > width + shift_x && wrapped){
x = shift_x;
y += font_height;
}
if (y > height + shift_y) goto buffer_get_render_data_end;
switch (ch){
case '\n':
write_render_item_inline(item, i, ' ', x, y, advance_data, stride, font_height);
++item_i;
++item;
x = shift_x;
y += font_height;
break;
case 0:
ch_width = write_render_item_inline(item, i, '\\', x, y, advance_data, stride, font_height);
++item_i;
++item;
x += ch_width;
ch_width = write_render_item_inline(item, i, '0', x, y, advance_data, stride, font_height);
++item_i;
++item;
x += ch_width;
break;
case '\r':
ch_width = write_render_item_inline(item, i, '\\', x, y, advance_data, stride, font_height);
++item_i;
++item;
x += ch_width;
ch_width = write_render_item_inline(item, i, 'r', x, y, advance_data, stride, font_height);
++item_i;
++item;
x += ch_width;
break;
case '\t':
ch_width_sub = write_render_item_inline(item, i, '\\', x, y, advance_data, stride, font_height);
++item_i;
++item;
write_render_item_inline(item, i, 't', x + ch_width_sub, y, advance_data, stride, font_height);
++item_i;
++item;
x += ch_width;
break;
default:
write_render_item(item, i, ch, x, y, ch_width, font_height);
++item_i;
++item;
x += ch_width;
break;
}
if (y > height + shift_y) goto buffer_get_render_data_end;
}
}
buffer_get_render_data_end:
// TODO(allen): handle this with a control state
assert_4tech(item_i <= max);
*count = item_i;
}
internal_4tech void
buffer_get_render_data(Buffer_Type *buffer, float *wraps, Buffer_Render_Item *items, int max, int *count,
float port_x, float port_y, float scroll_x, float scroll_y, int wrapped,
float width, float height, void *advance_data, int stride, float font_height){
Full_Cursor start_cursor;
if (wrapped){
start_cursor = buffer_cursor_from_wrapped_xy(buffer, 0, scroll_y, 0, wraps,
width, font_height, advance_data, stride);
}
else{
start_cursor = buffer_cursor_from_unwrapped_xy(buffer, 0, scroll_y, 0, wraps,
width, font_height, advance_data, stride);
}
buffer_get_render_data(buffer, wraps, items, max, count,
port_x, port_y, scroll_x, scroll_y, start_cursor, wrapped,
width, height, advance_data, stride, font_height);
}
// BOTTOM