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4coder/4ed_buffer.cpp

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/*
* Mr. 4th Dimention - Allen Webster
*
* 06.01.2017
*
* The 4coder base buffer data structure.
*
*/
// TOP
//
// Buffer low level operations
//
internal void
write_cursor_with_index(Cursor_With_Index *positions, i32 *count, i32 pos){
positions[(*count)].index = *count;
positions[(*count)].pos = pos;
++(*count);
}
// TODO(allen): Rewrite this without being a dumbass.
// TODO(allen): Rewrite this without being a dumbass.
// TODO(allen): Rewrite this without being a dumbass.
#define CursorSwap__(a,b) { Cursor_With_Index t = a; a = b; b = t; }
// TODO(allen): Rewrite this without being a dumbass.
internal void
buffer_quick_sort_cursors(Cursor_With_Index *positions, i32 start, i32 pivot){
i32 mid = start;
i32 pivot_pos = positions[pivot].pos;
for (i32 i = mid; i < pivot; ++i){
if (positions[i].pos < pivot_pos){
CursorSwap__(positions[mid], positions[i]);
++mid;
}
}
CursorSwap__(positions[mid], positions[pivot]);
if (start < mid - 1){
buffer_quick_sort_cursors(positions, start, mid - 1);
}
if (mid + 1 < pivot){
buffer_quick_sort_cursors(positions, mid + 1, pivot);
}
}
// TODO(allen): Rewrite this without being a dumbass.
internal void
buffer_quick_unsort_cursors(Cursor_With_Index *positions, i32 start, i32 pivot){
i32 mid = start;
i32 pivot_index = positions[pivot].index;
for (i32 i = mid; i < pivot; ++i){
if (positions[i].index < pivot_index){
CursorSwap__(positions[mid], positions[i]);
++mid;
}
}
CursorSwap__(positions[mid], positions[pivot]);
if (start < mid - 1) buffer_quick_unsort_cursors(positions, start, mid - 1);
if (mid + 1 < pivot) buffer_quick_unsort_cursors(positions, mid + 1, pivot);
}
#undef CursorSwap__
internal void
buffer_sort_cursors(Cursor_With_Index *positions, i32 count){
if (count > 0){
buffer_quick_sort_cursors(positions, 0, count - 1);
}
}
internal void
buffer_unsort_cursors(Cursor_With_Index *positions, i32 count){
if (count > 0){
buffer_quick_unsort_cursors(positions, 0, count - 1);
}
}
internal void
buffer_update_cursors(Cursor_With_Index *sorted_positions, i32 count, i32 start, i32 end, i32 len, b32 lean_right){
i32 shift_amount = (len - (end - start));
Cursor_With_Index *position = sorted_positions + count - 1;
if (lean_right){
for (; position >= sorted_positions && position->pos > end; --position){
position->pos += shift_amount;
}
for (; position >= sorted_positions && position->pos >= start; --position){
position->pos = start + len;
}
}
else{
for (; position >= sorted_positions && position->pos > end; --position){
position->pos += shift_amount;
}
for (; position >= sorted_positions && position->pos >= start; --position){
position->pos = start;
}
}
}
internal i32
buffer_batch_debug_sort_check(Buffer_Edit *sorted_edits, i32 edit_count){
Buffer_Edit *edit = sorted_edits;
i32 i = 0, start_point = 0;
i32 result = 1;
for (i = 0; i < edit_count; ++i, ++edit){
if (start_point > edit->start){
result = 0; break;
}
start_point = (edit->end < edit->start + 1)?(edit->start + 1):(edit->end);
}
return(result);
}
// TODO(allen): This now relies on Edit and Edit_Array from 4ed_edit.h even though we sort of think of that
// as cheating... gotta rethink the separation of buffer from everything else moving forward or something.
internal i32
buffer_batch_edit_update_cursors(Cursor_With_Index *sorted_positions, i32 count, Edit_Array sorted_edits, b32 lean_right){
Cursor_With_Index *position = sorted_positions;
Cursor_With_Index *one_past_last_position = sorted_positions + count;
Edit *edit = sorted_edits.vals;
Edit *one_past_last_edit = sorted_edits.vals + sorted_edits.count;
i32 shift_amount = 0;
if (lean_right){
for (;edit < one_past_last_edit && position < one_past_last_position;
++edit){
i32 start = edit->range.first;
i32 end = edit->range.one_past_last;
for (;position->pos < start && position < one_past_last_position;
++position){
position->pos += shift_amount;
}
i32 new_end = start + edit->length + shift_amount;
for (;position->pos <= end && position < one_past_last_position;
++position){
position->pos = new_end;
}
shift_amount += (edit->length - (end - start));
}
}
else{
for (;edit < one_past_last_edit && position < one_past_last_position;
++edit){
i32 start = edit->range.first;
i32 end = edit->range.one_past_last;
for (;position->pos < start && position < one_past_last_position;
++position){
position->pos += shift_amount;
}
i32 new_end = start + shift_amount;
for (;position->pos <= end && position < one_past_last_position;
++position){
position->pos = new_end;
}
shift_amount += (edit->length - (end - start));
}
}
for (;position < one_past_last_position;
++position){
position->pos += shift_amount;
}
for (;edit < one_past_last_edit;
++edit){
shift_amount += (edit->length - (edit->range.one_past_last - edit->range.first));
}
return(shift_amount);
}
//////////////////////////////////////
internal i32
eol_convert_in(char *dest, char *src, i32 size){
i32 i = 0;
i32 j = 0;
i32 k = 0;
for (; j < size && src[j] != '\r'; ++j);
memcpy(dest, src, j);
if (j < size){
k = 1;
++j;
for (i = j; i < size; ++i){
if (src[i] == '\r'){
memcpy(dest + j - k, src + j, i - j);
++k;
j = i+1;
}
}
memcpy(dest + j - k, src + j, i - j);
j = i - k;
}
return(j);
}
internal i32
eol_in_place_convert_in(char *data, i32 size){
i32 i = 0;
i32 j = 0;
i32 k = 0;
for (; j < size && data[j] != '\r'; ++j);
if (j < size){
k = 1;
++j;
for (i = j; i < size; ++i){
if (data[i] == '\r'){
memmove(data + j - k, data + j, i - j);
++k;
j = i+1;
}
}
memmove(data + j - k, data + j, i - j);
j = i - k;
}
return(j);
}
// TODO(allen): iterative memory check?
internal i32
eol_convert_out(char *dest, i32 max, char *src, i32 size, i32 *size_out){
i32 result = 1;
i32 i = 0;
i32 j = 0;
for (; i < size; ++i, ++j){
if (src[i] == '\n'){
dest[j] = '\r';
++j;
dest[j] = '\n';
}
else dest[j] = src[i];
}
*size_out = j;
return(result);
}
// TODO(allen): iterative memory check?
internal i32
eol_in_place_convert_out(char *data, i32 size, i32 max, i32 *size_out){
i32 result = 1;
i32 i = 0;
for (; i < size; ++i){
if (data[i] == '\n'){
memmove(data + i + 1, data + i, size - i);
data[i] = '\r';
++i;
++size;
}
}
*size_out = size;
return(result);
}
//////////////////////////////////////
//
// Implementation of the gap buffer
//
internal i32
buffer_good(Gap_Buffer *buffer){
i32 good = (buffer->data != 0);
return(good);
}
internal i32
buffer_size(Gap_Buffer *buffer){
i32 size = buffer->size1 + buffer->size2;
return(size);
}
internal Gap_Buffer_Init
buffer_begin_init(Gap_Buffer *buffer, u8 *data, umem size){
Gap_Buffer_Init init;
init.buffer = buffer;
init.data = (char*)data;
init.size = (i32)size;
return(init);
}
internal b32
buffer_init_need_more(Gap_Buffer_Init *init){
return(init->buffer->data == 0);
}
internal i32
buffer_init_page_size(Gap_Buffer_Init *init){
return(init->size * 2);
}
internal void
buffer_init_provide_page(Gap_Buffer_Init *init, void *page, i32 page_size){
Gap_Buffer *buffer = init->buffer;
buffer->data = (char*)page;
buffer->max = page_size;
}
internal b32
buffer_end_init(Gap_Buffer_Init *init){
Gap_Buffer *buffer = init->buffer;
b32 result = false;
if (buffer->data != 0 && buffer->max >= init->size){
i32 size = init->size;
i32 size2 = (size >> 1);
i32 osize1 = size - size2;
i32 size1 = osize1;
if (size1 > 0){
size1 = eol_convert_in(buffer->data, init->data, size1);
if (size2 > 0){
size2 = eol_convert_in(buffer->data + size1, init->data + osize1, size2);
}
}
buffer->size1 = size1;
buffer->size2 = size2;
buffer->gap_size = buffer->max - size1 - size2;
memmove(buffer->data + size1 + buffer->gap_size, buffer->data + size1, size2);
result = true;
}
return(result);
}
internal b32
buffer_stringify_loop(Gap_Buffer_Stream *stream, Gap_Buffer *buffer, i32 start, i32 end){
b32 result = false;
if (0 <= start && start < end && end <= buffer->size1 + buffer->size2){
stream->buffer = buffer;
stream->absolute_end = end;
if (start < buffer->size1){
if (buffer->size1 < end){
stream->separated = true;
}
else{
stream->separated = false;
}
stream->data = buffer->data;
}
else{
stream->separated = false;
stream->data = buffer->data + buffer->gap_size;
}
if (stream->separated){
stream->end = buffer->size1;
}
else{
stream->end = end;
}
if (stream->end > stream->absolute_end){
stream->end = stream->absolute_end;
}
result = true;
}
if (!result && stream->use_termination_character){
stream->buffer = buffer;
stream->absolute_end = end;
stream->use_termination_character = true;
stream->data = (&stream->terminator) - buffer->size1 - buffer->size2;
stream->end = stream->absolute_end + 1;
result = true;
}
return(result);
}
internal b32
buffer_stringify_next(Gap_Buffer_Stream *stream){
b32 result = 0;
Gap_Buffer *buffer = stream->buffer;
if (stream->separated){
stream->data = buffer->data + buffer->gap_size;
stream->end = stream->absolute_end;
stream->separated = 0;
result = 1;
}
if (result == 0){
if (stream->use_termination_character){
stream->use_termination_character = 0;
stream->data = (&stream->terminator) - buffer->size1 - buffer->size2;
stream->end = stream->absolute_end + 1;
result = 1;
}
}
return(result);
}
internal i32
buffer_replace_range_compute_shift(i32 start, i32 end, i32 len){
return(len - (end - start));
}
internal b32
buffer_replace_range(Gap_Buffer *buffer, i32 start, i32 end, char *str, i32 len, i32 shift_amount, i32 *request_amount){
char *data = buffer->data;
i32 size = buffer_size(buffer);
b32 result = false;
i32 move_size = 0;
Assert(0 <= start);
Assert(start <= end);
Assert(end <= size);
if (shift_amount + size <= buffer->max){
if (end < buffer->size1){
move_size = buffer->size1 - end;
memmove(data + buffer->size1 + buffer->gap_size - move_size, data + end, move_size);
buffer->size1 -= move_size;
buffer->size2 += move_size;
}
if (start > buffer->size1){
move_size = start - buffer->size1;
memmove(data + buffer->size1, data + buffer->size1 + buffer->gap_size, move_size);
buffer->size1 += move_size;
buffer->size2 -= move_size;
}
memcpy(data + start, str, len);
buffer->size2 = size - end;
buffer->size1 = start + len;
buffer->gap_size -= shift_amount;
Assert(buffer->size1 + buffer->size2 == size + shift_amount);
Assert(buffer->size1 + buffer->gap_size + buffer->size2 == buffer->max);
}
else{
*request_amount = round_up_i32(2*(shift_amount + size), KB(4));
result = true;
}
return(result);
}
internal b32
buffer_batch_edit_step(Buffer_Batch_State *state, Gap_Buffer *buffer, Edit_Array sorted_edits, i32 *request_amount){
b32 result = false;
i32 shift_total = state->shift_total;
i32 i = state->i;
Edit *edit = sorted_edits.vals + i;
for (; i < sorted_edits.count; ++i, ++edit){
char *str = edit->str;
i32 length = edit->length;
i32 start = edit->range.first + shift_total;
i32 end = edit->range.one_past_last + shift_total;
i32 shift_amount = buffer_replace_range_compute_shift(start, end, length);
result = buffer_replace_range(buffer, start, end, str, length, shift_amount, request_amount);
if (result){
break;
}
shift_total += shift_amount;
}
state->shift_total = shift_total;
state->i = i;
return(result);
}
internal void*
buffer_edit_provide_memory(Gap_Buffer *buffer, void *new_data, i32 new_max){
void *result = buffer->data;
i32 size = buffer_size(buffer);
i32 new_gap_size = new_max - size;
Assert(new_max >= size);
memcpy(new_data, buffer->data, buffer->size1);
memcpy((char*)new_data + buffer->size1 + new_gap_size, buffer->data + buffer->size1 + buffer->gap_size, buffer->size2);
buffer->data = (char*)new_data;
buffer->gap_size = new_gap_size;
buffer->max = new_max;
return(result);
}
//
// High level buffer operations
//
internal String_Const_u8_Array
buffer_get_chunks(Cursor *cursor, Gap_Buffer *buffer, Buffer_Get_Chunk_Mode mode){
i32 total_count = (buffer->size1 > 0) + (buffer->size2 > 0) + (mode == BufferGetChunk_ZeroTerminated);
String_Const_u8_Array result = {};
result.vals = push_array(cursor, String_Const_u8, total_count);
if (buffer->size1 > 0){
result.vals[result.count] = SCu8(buffer->data, buffer->size1);
result.count += 1;
}
if (buffer->size2 > 0){
result.vals[result.count] = SCu8(buffer->data + buffer->size1 + buffer->gap_size, buffer->size2);
result.count += 1;
}
if (mode == BufferGetChunk_ZeroTerminated){
result.vals[result.count] = SCu8();
result.count += 1;
}
return(result);
}
internal String_Const_u8_Array
buffer_get_chunks(Cursor *cursor, Gap_Buffer *buffer){
return(buffer_get_chunks(cursor, buffer, BufferGetChunk_Basic));
}
internal String_Const_u8_Array
buffer_chunks_clamp(String_Const_u8_Array chunks, Range_i64 range){
i64 real_position = 0;
for (i32 i = 0; i < chunks.count; i += 1){
Range_i64 chunk_range = Ii64(real_position, real_position + chunks.strings[i].size);
Range_i64 clamped_range = Ii64(clamp(range.min, chunk_range.min, range.max),
clamp(range.min, chunk_range.max, range.max));
chunks.strings[i].str += clamped_range.min - chunk_range.min;
chunks.strings[i].size = range_size(clamped_range);
real_position += range_size(chunk_range);
}
for (; chunks.count > 0 && chunks.strings[0].size == 0;){
chunks.strings += 1;
chunks.count -= 1;
}
for (; chunks.count > 0 && chunks.strings[chunks.count - 1].size == 0;){
chunks.count -= 1;
}
return(chunks);
}
internal void
buffer_stringify(Gap_Buffer *buffer, i32 start, i32 end, char *out){
Gap_Buffer_Stream stream = {};
i32 i = start;
if (buffer_stringify_loop(&stream, buffer, i, end)){
b32 still_looping = 0;
do{
i32 size = stream.end - i;
memcpy(out, stream.data + i, size);
i = stream.end;
out += size;
still_looping = buffer_stringify_next(&stream);
}while(still_looping);
}
}
internal void
buffer_stringify_range(Gap_Buffer *buffer, Range range, char *out){
buffer_stringify(buffer, range.first, range.one_past_last, out);
}
internal i32
buffer_convert_out(Gap_Buffer *buffer, char *dest, i32 max){
Gap_Buffer_Stream stream = {};
i32 i = 0;
i32 size = buffer_size(buffer);
Assert(size + buffer->line_count <= max);
i32 pos = 0;
if (buffer_stringify_loop(&stream, buffer, 0, size)){
b32 still_looping = 0;
do{
i32 chunk_size = stream.end - i;
i32 out_size = 0;
i32 result = eol_convert_out(dest + pos, max - pos, stream.data + i, chunk_size, &out_size);
Assert(result);
i = stream.end;
pos += out_size;
still_looping = buffer_stringify_next(&stream);
}while(still_looping);
}
return(pos);
}
internal i32
buffer_count_newlines(Gap_Buffer *buffer, i32 start, i32 end){
Gap_Buffer_Stream stream = {};
i32 i = start;
i32 count = 0;
Assert(0 <= start);
Assert(start <= end);
Assert(end <= buffer_size(buffer));
if (buffer_stringify_loop(&stream, buffer, i, end)){
b32 still_looping = 0;
do{
for (; i < stream.end; ++i){
count += (stream.data[i] == '\n');
}
still_looping = buffer_stringify_next(&stream);
}while(still_looping);
}
return(count);
}
// TODO(allen): Rewrite this with a duff routine
// Also make it so that the array goes one past the end
// and stores the size in the extra spot.
internal i32
buffer_measure_starts(Buffer_Measure_Starts *state, Gap_Buffer *buffer){
Gap_Buffer_Stream stream = {};
i32 size = buffer_size(buffer);
i32 start = state->start, i = state->i;
i32 *start_ptr = buffer->line_starts + state->count;
i32 *start_end = buffer->line_starts + buffer->line_max;
i32 result = 1;
if (buffer_stringify_loop(&stream, buffer, i, size)){
b32 still_looping = 0;
do{
for (; i < stream.end; ++i){
char ch = stream.data[i];
if (ch == '\n'){
if (start_ptr == start_end){
goto buffer_measure_starts_widths_end;
}
*start_ptr++ = start;
start = i + 1;
}
}
still_looping = buffer_stringify_next(&stream);
}while(still_looping);
}
Assert(i == size);
if (start_ptr == start_end){
goto buffer_measure_starts_widths_end;
}
*start_ptr++ = start;
result = 0;
buffer_measure_starts_widths_end:;
state->i = i;
state->count = (i32)(start_ptr - buffer->line_starts);
state->start = start;
if (!result){
buffer->line_count = state->count;
}
return(result);
}
internal void
buffer_measure_character_starts(System_Functions *system, Gap_Buffer *buffer, i32 *character_starts, i32 mode, i32 virtual_white){
Assert(mode == 0);
Gap_Buffer_Stream stream = {};
i32 i = 0;
i32 size = buffer_size(buffer);
i32 line_index = 0;
i32 character_index = 0;
b32 skipping_whitespace = 0;
character_starts[line_index++] = character_index;
if (virtual_white){
skipping_whitespace = 1;
}
Translation_State tran = {};
Translation_Emits emits = {};
stream.use_termination_character = 1;
stream.terminator = '\n';
if (buffer_stringify_loop(&stream, buffer, i, size)){
b32 still_looping = 0;
do{
for (; i < stream.end; ++i){
u8 ch = (u8)stream.data[i];
translating_fully_process_byte(&tran, ch, i, size, &emits);
for (TRANSLATION_DECL_EMIT_LOOP(J, emits)){
TRANSLATION_DECL_GET_STEP(step, behavior, J, emits);
if (behavior.do_newline){
++character_index;
character_starts[line_index++] = character_index;
if (virtual_white){
skipping_whitespace = 1;
}
}
else if (behavior.do_codepoint_advance || behavior.do_number_advance){
if (ch != ' ' && ch != '\t'){
skipping_whitespace = 0;
}
if (!skipping_whitespace){
++character_index;
}
}
}
}
still_looping = buffer_stringify_next(&stream);
}while(still_looping);
}
Assert(line_index-1 == buffer->line_count);
}
// duff-routine defines
#define DrCase(PC) case PC: goto resumespot_##PC
#define DrYield(PC, n) { *S_ptr = S; S_ptr->__pc__ = PC; return(n); resumespot_##PC:; }
#define DrReturn(n) { *S_ptr = S; S_ptr->__pc__ = -1; return(n); }
internal Buffer_Layout_Stop
buffer_measure_wrap_y(Buffer_Measure_Wrap_State *S_ptr, Buffer_Measure_Wrap_Params params, f32 line_shift, b32 do_wrap, i32 wrap_unit_end){
Buffer_Measure_Wrap_State S = *S_ptr;
Buffer_Layout_Stop S_stop;
switch (S.__pc__){
DrCase(1);
DrCase(2);
DrCase(3);
DrCase(4);
}
S.size = buffer_size(params.buffer);
if (params.virtual_white){
S_stop.status = BLStatus_NeedLineShift;
S_stop.line_index = S.line_index;
S_stop.wrap_line_index = S.current_wrap_index;
S_stop.pos = S.i;
DrYield(1, S_stop);
}
S.x = line_shift;
params.wrap_line_index[S.line_index++] = 0;
if (params.virtual_white){
S.skipping_whitespace = true;
}
S.first_of_the_line = 1;
if (buffer_stringify_loop(&S.stream, params.buffer, S.i, S.size)){
S.still_looping = 0;
do{
for (; S.i < S.stream.end; ++S.i){
{
u8 ch = (u8)S.stream.data[S.i];
if (ch != ' ' && ch != '\t'){
S.skipping_whitespace = false;
}
translating_fully_process_byte(&S.tran, ch, S.i, S.size, &S.emits);
}
for (TRANSLATION_EMIT_LOOP(S.J, S.emits)){
TRANSLATION_GET_STEP(S.step, S.behavior, S.J, S.emits);
if (S.behavior.do_newline){
++S.current_wrap_index;
params.wrap_line_index[S.line_index++] = S.current_wrap_index;
if (params.virtual_white){
S_stop.status = BLStatus_NeedLineShift;
S_stop.line_index = S.line_index - 1;
S_stop.wrap_line_index = S.current_wrap_index;
S_stop.pos = S.i+1;
DrYield(2, S_stop);
}
S.x = line_shift;
if (params.virtual_white){
S.skipping_whitespace = 1;
}
S.first_of_the_line = 1;
}
else if (S.behavior.do_number_advance || S.behavior.do_codepoint_advance){
if (!S.skipping_whitespace){
if (S.behavior.do_codepoint_advance){
S.current_adv = font_get_glyph_advance(params.face, S.step.value);
}
else{
S.current_adv = params.face->byte_advance;
}
S.did_wrap = false;
if (S.step.i >= S.wrap_unit_end){
S_stop.status = BLStatus_NeedWrapDetermination;
S_stop.line_index = S.line_index - 1;
S_stop.wrap_line_index = S.current_wrap_index;
S_stop.pos = S.step.i;
S_stop.x = S.x;
DrYield(4, S_stop);
S.wrap_unit_end = wrap_unit_end;
if (do_wrap && !S.first_of_the_line){
S.did_wrap = true;
++S.current_wrap_index;
if (params.virtual_white){
S_stop.status = BLStatus_NeedWrapLineShift;
S_stop.line_index = S.line_index - 1;
S_stop.wrap_line_index = S.current_wrap_index;
S_stop.pos = S.step.i;
DrYield(3, S_stop);
}
S.x = line_shift + S.current_adv;
}
}
if (!S.did_wrap){
S.x += S.current_adv;
}
S.first_of_the_line = 0;
}
}
}
}
S.still_looping = buffer_stringify_next(&S.stream);
}while(S.still_looping);
}
++S.current_wrap_index;
params.wrap_line_index[S.line_index++] = S.current_wrap_index;
Assert(S.line_index-1 == params.buffer->line_count);
S_stop.status = BLStatus_Finished;
DrReturn(S_stop);
}
#undef DrCase
#undef DrYield
#undef DrReturn
internal void
buffer_remeasure_starts(Gap_Buffer *buffer, i32 line_start, i32 line_end, i32 line_shift, i32 text_shift){
i32 *starts = buffer->line_starts;
i32 line_count = buffer->line_count;
Assert(0 <= line_start);
Assert(line_start <= line_end);
Assert(line_end < line_count);
Assert(line_count + line_shift <= buffer->line_max);
++line_end;
// Adjust
if (text_shift != 0){
i32 line_i = line_end;
starts += line_i;
for (; line_i < line_count; ++line_i, ++starts){
*starts += text_shift;
}
starts = buffer->line_starts;
}
// Shift
i32 new_line_count = line_count;
i32 new_line_end = line_end;
if (line_shift != 0){
new_line_count += line_shift;
new_line_end += line_shift;
memmove(starts + line_end + line_shift, starts + line_end, sizeof(i32)*(line_count - line_end));
}
// Iteration data (yikes! Need better loop system)
Gap_Buffer_Stream stream = {};
i32 size = buffer_size(buffer);
i32 char_i = starts[line_start];
i32 line_i = line_start;
// Line start measurement
i32 start = char_i;
if (buffer_stringify_loop(&stream, buffer, char_i, size)){
b32 still_looping = 0;
do{
for (; char_i < stream.end; ++char_i){
u8 ch = (u8)stream.data[char_i];
if (ch == '\n'){
starts[line_i] = start;
++line_i;
start = char_i + 1;
// TODO(allen): I would like to know that I am not guessing here,
// so let's try to turn the && into an Assert.
if (line_i >= new_line_end && (line_i >= new_line_count || start == starts[line_i])){
goto buffer_remeasure_starts_end;
}
}
}
still_looping = buffer_stringify_next(&stream);
}while(still_looping);
}
// TODO(allen): I suspect this can just go away.
if (char_i == size){
starts[line_i++] = start;
}
buffer_remeasure_starts_end:;
Assert(line_count >= 1);
buffer->line_count = new_line_count;
}
internal void
buffer_remeasure_character_starts(System_Functions *system, Gap_Buffer *buffer, i32 line_start, i32 line_end, i32 line_shift, i32 *character_starts, i32 mode, i32 virtual_whitespace){
Assert(mode == 0);
i32 new_line_count = buffer->line_count;
Assert(0 <= line_start);
Assert(line_start <= line_end);
Assert(line_end < new_line_count - line_shift);
++line_end;
// Shift
i32 line_count = new_line_count;
i32 new_line_end = line_end;
if (line_shift != 0){
line_count -= line_shift;
new_line_end += line_shift;
memmove(character_starts + line_end + line_shift, character_starts + line_end, sizeof(i32)*(line_count - line_end + 1));
}
// Iteration data
Gap_Buffer_Stream stream = {};
i32 size = buffer_size(buffer);
i32 char_i = buffer->line_starts[line_start];
i32 line_i = line_start;
// Character measurement
i32 last_char_start = character_starts[line_i];
i32 current_char_start = last_char_start;
b32 skipping_whitespace = 0;
if (virtual_whitespace){
skipping_whitespace = 1;
}
// Translation
Translation_State tran = {};
Translation_Emits emits = {};
stream.use_termination_character = 1;
stream.terminator = '\n';
if (buffer_stringify_loop(&stream, buffer, char_i, size)){
b32 still_looping = 0;
do{
for (; char_i < stream.end; ++char_i){
u8 ch = (u8)stream.data[char_i];
translating_fully_process_byte(&tran, ch, char_i, size, &emits);
for (TRANSLATION_DECL_EMIT_LOOP(J, emits)){
TRANSLATION_DECL_GET_STEP(step, behavior, J, emits);
if (behavior.do_newline){
character_starts[line_i++] = last_char_start;
++current_char_start;
last_char_start = current_char_start;
if (virtual_whitespace){
skipping_whitespace = 1;
}
if (line_i >= new_line_end){
goto buffer_remeasure_character_starts_end;
}
}
else if (behavior.do_codepoint_advance || behavior.do_number_advance){
if (ch != ' ' && ch != '\t'){
skipping_whitespace = 0;
}
if (!skipping_whitespace){
++current_char_start;
}
}
}
}
still_looping = buffer_stringify_next(&stream);
}while(still_looping);
}
Assert(line_i >= new_line_end);
buffer_remeasure_character_starts_end:;
// Adjust
if (line_i <= new_line_end){
i32 character_shift = current_char_start - character_starts[line_i];
if (character_shift != 0){
character_starts += line_i;
for (; line_i <= new_line_count; ++line_i, ++character_starts){
*character_starts += character_shift;
}
}
}
}
internal void
buffer_remeasure_wrap_y(Gap_Buffer *buffer, i32 line_start, i32 line_end, i32 line_shift,
f32 *wraps, f32 font_height, f32 *adv, f32 max_width){
i32 new_line_count = buffer->line_count;
Assert(0 <= line_start);
Assert(line_start <= line_end);
Assert(line_end < new_line_count - line_shift);
++line_end;
// Shift
i32 line_count = new_line_count;
i32 new_line_end = line_end;
if (line_shift != 0){
line_count -= line_shift;
new_line_end += line_shift;
memmove(wraps + line_end + line_shift, wraps + line_end, sizeof(i32)*(line_count - line_end + 1));
}
// Iteration data (yikes! Need better loop system)
Gap_Buffer_Stream stream = {};
i32 size = buffer_size(buffer);
i32 char_i = buffer->line_starts[line_start];
i32 line_i = line_start;
// Line wrap measurement
f32 last_wrap = wraps[line_i];
f32 current_wrap = last_wrap;
f32 x = 0.f;
if (buffer_stringify_loop(&stream, buffer, char_i, size)){
b32 still_looping = 0;
do{
for (; char_i < stream.end; ++char_i){
u8 ch = (u8)stream.data[char_i];
if (ch == '\n'){
wraps[line_i] = last_wrap;
++line_i;
current_wrap += font_height;
last_wrap = current_wrap;
x = 0.f;
// TODO(allen): I would like to know that I am not guessing here.
if (line_i >= new_line_end){
goto buffer_remeasure_wraps_end;
}
}
else{
f32 current_adv = adv[ch];
if (x + current_adv > max_width){
current_wrap += font_height;
x = current_adv;
}
else{
x += current_adv;
}
}
}
still_looping = buffer_stringify_next(&stream);
}while(still_looping);
}
wraps[line_i++] = last_wrap;
buffer_remeasure_wraps_end:;
// Adjust
if (line_i <= new_line_end){
f32 y_shift = current_wrap - wraps[line_i];
if (y_shift != 0){
wraps += line_i;
for (; line_i <= new_line_count; ++line_i, ++wraps){
*wraps += y_shift;
}
}
}
}
internal i32
binary_search(i32 *array, i32 value, i32 l_bound, i32 u_bound){
i32 start = l_bound, end = u_bound;
i32 i = 0;
if (value < 0){
value = 0;
}
for (;;){
i = (start + end) >> 1;
if (array[i] < value){
start = i;
}
else if (array[i] > value){
end = i;
}
else{
break;
}
Assert(start < end);
if (start == end - 1){
i = start;
break;
}
}
return(i);
}
// TODO(allen): CHECK
internal i32
buffer_get_line_index_range(Gap_Buffer *buffer, i32 pos, i32 l_bound, i32 u_bound){
Assert(0 <= l_bound);
Assert(l_bound <= u_bound);
Assert(u_bound <= buffer->line_count);
Assert(buffer->line_starts != 0);
i32 i = binary_search(buffer->line_starts, pos, l_bound, u_bound);
return(i);
}
internal i32
buffer_get_line_number(Gap_Buffer *buffer, i32 pos){
i32 result = buffer_get_line_index_range(buffer, pos, 0, buffer->line_count);
return(result);
}
internal i32
buffer_get_line_index_from_character_pos(i32 *character_starts, i32 pos, i32 l_bound, i32 u_bound){
i32 i = binary_search(character_starts, pos, l_bound, u_bound);
return(i);
}
internal i32
buffer_get_line_index_from_wrapped_y(i32 *wrap_line_index, f32 y, i32 line_height, i32 l_bound, i32 u_bound){
i32 wrap_index = floor32(y/line_height);
i32 i = binary_search(wrap_line_index, wrap_index, l_bound, u_bound);
return(i);
}
internal Partial_Cursor
buffer_partial_from_pos(Gap_Buffer *buffer, i32 pos){
Partial_Cursor result = {};
i32 size = buffer_size(buffer);
pos = clamp(0, pos, size);
i32 line_index = buffer_get_line_index_range(buffer, pos, 0, buffer->line_count);
result.pos = pos;
result.line = line_index + 1;
result.character = pos - buffer->line_starts[line_index] + 1;
return(result);
}
internal Partial_Cursor
buffer_partial_from_line_character(Gap_Buffer *buffer, i32 line, i32 character){
Partial_Cursor result = {};
i32 line_index = line - 1;
i32 last_line_index = buffer->line_count - 1;
line_index = clamp(0, line_index, last_line_index);
i32 size = buffer_size(buffer);
i32 this_start = buffer->line_starts[line_index];
i32 max_character = (size - this_start) + 1;
if (line_index < last_line_index){
i32 next_start = buffer->line_starts[line_index + 1];
max_character = (next_start - this_start);
}
i32 adjusted_pos = 0;
if (character > 0){
if (character > max_character){
adjusted_pos = max_character - 1;
}
else{
adjusted_pos = character - 1;
}
}
else if (character == 0){
adjusted_pos = 0;
}
else{
if (-character > max_character){
adjusted_pos = 0;
}
else{
adjusted_pos = max_character + character;
}
}
result.pos = this_start + adjusted_pos;
result.line = line_index + 1;
result.character = character;
return(result);
}
// dialogical-routine defines
#define DrCase(PC) case PC: goto resumespot_##PC
#define DrYield(PC, n) { *S_ptr = S; S_ptr->__pc__ = PC; return(n); resumespot_##PC:; }
#define DrReturn(n) { *S_ptr = S; S_ptr->__pc__ = -1; return(n); }
internal Buffer_Layout_Stop
buffer_cursor_seek(Buffer_Cursor_Seek_State *S_ptr, Buffer_Cursor_Seek_Params params, f32 line_shift, b32 do_wrap, i32 wrap_unit_end){
Buffer_Cursor_Seek_State S = *S_ptr;
Buffer_Layout_Stop S_stop;
switch (S.__pc__){
DrCase(1);
DrCase(2);
DrCase(3);
DrCase(4);
}
S.font_height = (i32)(params.face->height);
S.xy_seek = (params.seek.type == buffer_seek_wrapped_xy || params.seek.type == buffer_seek_unwrapped_xy);
S.size = buffer_size(params.buffer);
// Get cursor hint
{
i32 line_index = 0;
switch (params.seek.type){
case buffer_seek_pos:
{
params.seek.pos = clamp(0, params.seek.pos, S.size);
line_index = buffer_get_line_number(params.buffer, (i32)params.seek.pos);
}break;
case buffer_seek_character_pos:
{
i32 line_count = params.buffer->line_count;
i32 max_character = params.character_starts[line_count] - 1;
params.seek.pos = clamp(0, params.seek.pos, max_character);
line_index = buffer_get_line_index_from_character_pos(params.character_starts, (i32)params.seek.pos, 0, params.buffer->line_count);
}break;
case buffer_seek_line_char:
{
line_index = (i32)params.seek.line - 1;
line_index = clamp_bot(0, line_index);
}break;
case buffer_seek_unwrapped_xy:
{
line_index = (i32)(params.seek.y / S.font_height);
line_index = clamp_bot(0, line_index);
}break;
case buffer_seek_wrapped_xy:
{
line_index = buffer_get_line_index_from_wrapped_y(params.wrap_line_index, params.seek.y, S.font_height, 0, params.buffer->line_count);
}break;
default: InvalidPath;
}
i32 safe_line_index = line_index;
if (line_index >= params.buffer->line_count){
safe_line_index = params.buffer->line_count-1;
}
// Build the cursor hint
S.next_cursor.pos = params.buffer->line_starts[safe_line_index];
S.next_cursor.character_pos = params.character_starts[safe_line_index];
S.next_cursor.line = safe_line_index + 1;
S.next_cursor.character = 1;
S.next_cursor.wrap_line = params.wrap_line_index[safe_line_index] + 1;
S.next_cursor.unwrapped_y = (f32)(safe_line_index * S.font_height);
S.next_cursor.unwrapped_x = 0;
S.next_cursor.wrapped_y = (f32)(params.wrap_line_index[safe_line_index] * S.font_height);
S.next_cursor.wrapped_x = 0;
}
// Get the initial line shift.
// Adjust the non-screen based coordinates to point to the first
// non-virtual character of the line.
if (params.virtual_white){
S_stop.status = BLStatus_NeedLineShift;
S_stop.line_index = (i32)S.next_cursor.line - 1;
S_stop.wrap_line_index = (i32)S.next_cursor.wrap_line - 1;
DrYield(1, S_stop);
S.next_cursor.unwrapped_x += line_shift;
S.next_cursor.wrapped_x += line_shift;
S.stream.use_termination_character = 1;
S.stream.terminator = '\n';
if (buffer_stringify_loop(&S.stream, params.buffer, (i32)S.next_cursor.pos, S.size)){
do{
for (; S.next_cursor.pos < S.stream.end; ++S.next_cursor.pos){
u8 ch = (u8)S.stream.data[S.next_cursor.pos];
if (ch != ' ' && ch != '\t'){
goto double_break_vwhite;
}
else{
++S.next_cursor.character;
}
}
S.still_looping = buffer_stringify_next(&S.stream);
}while(S.still_looping);
}
InvalidPath;
double_break_vwhite:;
}
// If the caller just wants the hint, return that now.
if (params.return_hint){
*params.cursor_out = S.next_cursor;
S_stop.status = BLStatus_Finished;
DrReturn(S_stop);
}
// If we are already passed the point we want to be at, then just take this.
S.this_cursor = S.next_cursor;
switch (params.seek.type){
case buffer_seek_pos:
{
if (S.next_cursor.pos >= params.seek.pos){
goto buffer_cursor_seek_end;
}
}break;
case buffer_seek_character_pos:
{
if (S.next_cursor.character_pos >= params.seek.pos){
goto buffer_cursor_seek_end;
}
}break;
case buffer_seek_line_char:
{
if ((S.next_cursor.line == params.seek.line &&
S.next_cursor.character >= params.seek.character) ||
S.next_cursor.line > params.seek.line){
goto buffer_cursor_seek_end;
}
}break;
case buffer_seek_unwrapped_xy:
{
if (S.next_cursor.unwrapped_y > params.seek.y){
goto buffer_cursor_seek_end;
}
}break;
case buffer_seek_wrapped_xy:
{
if (S.next_cursor.wrapped_y > params.seek.y){
goto buffer_cursor_seek_end;
}
}break;
}
// Main seek loop
S.i = (i32)S.next_cursor.pos;
S.stream = null_buffer_stream;
S.stream.use_termination_character = 1;
S.stream.terminator = 0;
S.first_of_the_line = 1;
if (buffer_stringify_loop(&S.stream, params.buffer, S.i, S.size)){
S.still_looping = 0;
do{
for (; S.i < S.stream.end; ++S.i){
{
u8 ch = (u8)S.stream.data[S.i];
translating_fully_process_byte(&S.tran, ch, S.i, S.size, &S.emits);
}
for (TRANSLATION_EMIT_LOOP(S.J, S.emits)){
TRANSLATION_GET_STEP(S.step, S.behavior, S.J, S.emits);
S.prev_cursor = S.this_cursor;
S.this_cursor = S.next_cursor;
if (S.behavior.do_newline){
++S.next_cursor.character_pos;
++S.next_cursor.line;
++S.next_cursor.wrap_line;
S.next_cursor.unwrapped_y += S.font_height;
S.next_cursor.wrapped_y += S.font_height;
S.next_cursor.character = 1;
S.next_cursor.unwrapped_x = 0;
if (params.virtual_white){
S_stop.status = BLStatus_NeedLineShift;
S_stop.line_index = (i32)S.next_cursor.line - 1;
S_stop.wrap_line_index = (i32)S.next_cursor.wrap_line - 1;
DrYield(2, S_stop);
}
S.next_cursor.wrapped_x = line_shift;
S.first_of_the_line = 1;
}
else if (S.behavior.do_number_advance || S.behavior.do_codepoint_advance){
if (S.behavior.do_codepoint_advance){
S.ch_width = font_get_glyph_advance(params.face, S.step.value);
}
else{
S.ch_width = params.face->byte_advance;
}
if (S.step.i >= S.wrap_unit_end){
S_stop.status = BLStatus_NeedWrapDetermination;
S_stop.line_index = (i32)S.next_cursor.line - 1;
S_stop.wrap_line_index = (i32)S.next_cursor.wrap_line - 1;
S_stop.pos = S.step.i;
S_stop.x = S.next_cursor.wrapped_x;
DrYield(4, S_stop);
S.wrap_unit_end = wrap_unit_end;
if (do_wrap && !S.first_of_the_line){
S.next_cursor.wrapped_y += S.font_height;
++S.next_cursor.wrap_line;
if (params.virtual_white){
S_stop.status = BLStatus_NeedWrapLineShift;
S_stop.line_index = (i32)S.next_cursor.line - 1;
S_stop.wrap_line_index = (i32)S.next_cursor.wrap_line - 1;
DrYield(3, S_stop);
}
S.next_cursor.wrapped_x = line_shift;
S.this_cursor = S.next_cursor;
}
}
++S.next_cursor.character_pos;
++S.next_cursor.character;
S.next_cursor.unwrapped_x += S.ch_width;
S.next_cursor.wrapped_x += S.ch_width;
S.first_of_the_line = 0;
}
S.next_cursor.pos += S.step.byte_length;
f32 x = 0, px = 0, y = 0, py = 0;
switch (params.seek.type){
case buffer_seek_pos:
if (S.this_cursor.pos >= params.seek.pos){
goto buffer_cursor_seek_end;
}break;
case buffer_seek_character_pos:
if (S.this_cursor.character_pos >= params.seek.pos){
goto buffer_cursor_seek_end;
}break;
case buffer_seek_wrapped_xy:
{
x = S.this_cursor.wrapped_x;
px = S.prev_cursor.wrapped_x;
y = S.this_cursor.wrapped_y;
py = S.prev_cursor.wrapped_y;
}break;
case buffer_seek_unwrapped_xy:
{
x = S.this_cursor.unwrapped_x;
px = S.prev_cursor.unwrapped_x;
y = S.this_cursor.unwrapped_y;
py = S.prev_cursor.wrapped_y;
}break;
case buffer_seek_line_char:
if (S.this_cursor.line == params.seek.line && S.this_cursor.character >= params.seek.character){
goto buffer_cursor_seek_end;
}
else if (S.this_cursor.line > params.seek.line){
S.this_cursor = S.prev_cursor;
goto buffer_cursor_seek_end;
}break;
}
if (S.xy_seek){
if (y > params.seek.y){
S.this_cursor = S.prev_cursor;
goto buffer_cursor_seek_end;
}
if (y > params.seek.y - S.font_height && x >= params.seek.x){
if (!params.seek.round_down){
if (py >= y && !S.behavior.do_newline && (params.seek.x - px) < (x - params.seek.x)){
S.this_cursor = S.prev_cursor;
}
goto buffer_cursor_seek_end;
}
if (py >= y){
S.this_cursor = S.prev_cursor;
}
goto buffer_cursor_seek_end;
}
}
if (S.next_cursor.pos > S.size){
goto buffer_cursor_seek_end;
}
}
}
S.still_looping = buffer_stringify_next(&S.stream);
}while(S.still_looping);
}
InvalidPath;
buffer_cursor_seek_end:;
*params.cursor_out = S.this_cursor;
S_stop.status = BLStatus_Finished;
DrReturn(S_stop);
}
#undef DrCase
#undef DrYield
#undef DrReturn
internal void
buffer_invert_edit_shift(Gap_Buffer *buffer, Buffer_Edit edit, Buffer_Edit *inverse, char *strings,
i32 *str_pos, i32 max, i32 shift_amount){
i32 pos = *str_pos;
i32 len = edit.end - edit.start;
Assert(pos >= 0);
Assert(pos + len <= max);
*str_pos = pos + len;
inverse->str_start = pos;
inverse->len = len;
inverse->start = edit.start + shift_amount;
inverse->end = edit.start + edit.len + shift_amount;
buffer_stringify(buffer, edit.start, edit.end, strings + pos);
}
internal void
buffer_invert_edit(Gap_Buffer *buffer, Buffer_Edit edit, Buffer_Edit *inverse, char *strings,
i32 *str_pos, i32 max){
buffer_invert_edit_shift(buffer, edit, inverse, strings, str_pos, max, 0);
}
internal i32
buffer_invert_batch(Buffer_Invert_Batch *state, Gap_Buffer *buffer, Buffer_Edit *edits, i32 count,
Buffer_Edit *inverse, char *strings, i32 *str_pos, i32 max){
i32 shift_amount = state->shift_amount;
i32 i = state->i;
Buffer_Edit *edit = edits + i;
Buffer_Edit *inv_edit = inverse + i;
i32 result = 0;
for (; i < count; ++i, ++edit, ++inv_edit){
if (*str_pos + edit->end - edit->start <= max){
buffer_invert_edit_shift(buffer, *edit, inv_edit, strings, str_pos, max, shift_amount);
shift_amount += (edit->len - (edit->end - edit->start));
}
else{
result = 1;
state->len = edit->end - edit->start;
}
}
state->i = i;
state->shift_amount = shift_amount;
return(result);
}
typedef u32 Render_Item_Flag;
enum{
RenderItemFlag_ForceEmit = 1,
RenderItemFlag_NoAdvance = 2,
};
internal Render_Item_Write
write_render_item(Render_Item_Write write, i32 index, u32 codepoint, u32 flags,
Render_Item_Flag render_flags){
if (write.item < write.item_end){
f32 ch_width = font_get_glyph_advance(write.face, codepoint);
b32 visible_on_layout = (write.x_min <= write.x + ch_width && write.x <= write.x_max);
if (visible_on_layout || ((render_flags & RenderItemFlag_ForceEmit) != 0)){
write.item->index = index;
write.item->codepoint = codepoint;
write.item->flags = flags;
write.item->x0 = write.x;
write.item->y0 = write.y;
write.item->x1 = write.x + ch_width;
write.item->y1 = write.y + write.font_height;
++write.item;
}
if ((render_flags & RenderItemFlag_NoAdvance) == 0){
write.x += ch_width;
}
}
return(write);
}
// duff-routine defines
#define DrCase(PC) case PC: goto resumespot_##PC
#define DrYield(PC, n) { *S_ptr = S; S_ptr->__pc__ = PC; return(n); resumespot_##PC:; }
#define DrReturn(n) { *S_ptr = S; S_ptr->__pc__ = -1; return(n); }
internal Buffer_Layout_Stop
buffer_render_data(Buffer_Render_State *S_ptr, Buffer_Render_Params params, f32 line_shift, b32 do_wrap, i32 wrap_unit_end){
Buffer_Render_State S = *S_ptr;
Buffer_Layout_Stop S_stop;
S.write.item_end = params.items + params.max;
switch (S.__pc__){
DrCase(1);
DrCase(2);
DrCase(3);
DrCase(4);
}
S.size = buffer_size(params.buffer);
S.size = Min(S.size, params.one_past_last_abs_pos);
S.shift_x = params.port_x - params.scroll_x;
S.shift_y = params.port_y - params.scroll_y;
if (params.wrapped){
S.shift_y += params.start_cursor.wrapped_y;
}
else{
S.shift_y += params.start_cursor.unwrapped_y;
}
S.line = (i32)params.start_cursor.line - 1;
S.wrap_line = (i32)params.start_cursor.wrap_line - 1;
if (params.virtual_white){
S_stop.status = BLStatus_NeedLineShift;
S_stop.line_index = S.line;
S_stop.wrap_line_index = S.wrap_line;
DrYield(1, S_stop);
}
S.write.item = params.items;
S.write.x = S.shift_x + line_shift;
S.write.y = S.shift_y;
S.write.system = params.system;
S.write.face = params.face;
S.write.font_height = (i32)params.face->height;
S.write.x_min = params.port_x;
S.write.x_max = params.port_x + params.clip_w;
S.byte_advance = params.face->byte_advance;
if (params.virtual_white){
S.skipping_whitespace = true;
}
S.first_of_the_line = true;
S.first_of_the_wrap = true;
S.i = (i32)params.start_cursor.pos;
if (buffer_stringify_loop(&S.stream, params.buffer, S.i, S.size)){
do{
for (; S.i < S.stream.end; ++S.i){
{
u8 ch = (u8)S.stream.data[S.i];
translating_fully_process_byte(&S.tran, ch, S.i, S.size, &S.emits);
}
for (TRANSLATION_EMIT_LOOP(S.J, S.emits)){
TRANSLATION_GET_STEP(S.step, S.behavior, S.J, S.emits);
if (!S.behavior.do_newline && S.step.i >= S.wrap_unit_end){
S_stop.status = BLStatus_NeedWrapDetermination;
S_stop.line_index = S.line;
S_stop.wrap_line_index = S.wrap_line;
S_stop.pos = S.step.i;
S_stop.x = S.write.x - S.shift_x;
DrYield(4, S_stop);
S.wrap_unit_end = wrap_unit_end;
if (do_wrap && !S.first_of_the_line){
if (params.virtual_white){
S_stop.status = BLStatus_NeedWrapLineShift;
S_stop.line_index = S.line;
S_stop.wrap_line_index = S.wrap_line + 1;
DrYield(2, S_stop);
}
++S.wrap_line;
if (params.wrapped){
switch (params.wrap_slashes){
case WrapIndicator_Show_After_Line:
{
S.write = write_render_item(S.write, S.step.i - 1, '\\', BRFlag_Ghost_Character, 0);
}break;
case WrapIndicator_Show_At_Wrap_Edge:
{
if (S.write.x < S.shift_x + params.width){
S.write.x = S.shift_x + params.width;
}
S.write = write_render_item(S.write, S.step.i - 1, '\\', BRFlag_Ghost_Character, 0);
}break;
}
S.write.x = S.shift_x + line_shift;
S.write.y += S.write.font_height;
S.first_of_the_wrap = true;
}
}
}
if (S.write.y > params.height + params.port_y || S.write.item >= S.write.item_end){
goto buffer_get_render_data_end;
}
if (S.behavior.do_newline){
{
Render_Item_Flag flags = 0;
if (S.first_of_the_wrap){
flags |= RenderItemFlag_ForceEmit;
}
S.write = write_render_item(S.write, S.step.i, ' ', 0, flags);
}
if (params.virtual_white){
S_stop.status = BLStatus_NeedLineShift;
S_stop.line_index = S.line + 1;
S_stop.wrap_line_index = S.wrap_line + 1;
DrYield(3, S_stop);
S.skipping_whitespace = true;
}
++S.line;
++S.wrap_line;
S.write.x = S.shift_x + line_shift;
S.write.y += S.write.font_height;
S.first_of_the_line = true;
S.first_of_the_wrap = true;
}
else if (S.behavior.do_codepoint_advance){
u32 n = S.step.value;
if (n != ' ' && n != '\t'){
S.skipping_whitespace = false;
}
u32 I = S.step.i;
if (!S.skipping_whitespace){
Render_Item_Flag flags = 0;
if (S.first_of_the_wrap){
flags |= RenderItemFlag_ForceEmit;
}
switch (n){
case '\r':
{
S.write = write_render_item(S.write, I, '\\', BRFlag_Special_Character, flags);
S.write = write_render_item(S.write, I, 'r', BRFlag_Special_Character, flags);
}break;
case '\t':
{
S.ch_width = font_get_glyph_advance(params.face, '\t');
f32 new_x = S.write.x + S.ch_width;
S.write = write_render_item(S.write, I, ' ', 0, flags);
S.write.x = new_x;
}break;
default:
{
S.write = write_render_item(S.write, I, n, 0, flags);
}break;
}
}
else if (S.first_of_the_wrap){
Render_Item_Flag flags = RenderItemFlag_ForceEmit|RenderItemFlag_NoAdvance;
S.write = write_render_item(S.write, I, ' ', 0, flags);
}
S.first_of_the_line = false;
S.first_of_the_wrap = false;
}
else if (S.behavior.do_number_advance){
u8 n = (u8)S.step.value;
u32 I = S.step.i;
S.skipping_whitespace = false;
S.ch_width = S.byte_advance;
f32 new_x = S.write.x + S.ch_width;
u8 cs[3];
cs[0] = '\\';
byte_to_ascii(n, cs+1);
Render_Item_Flag flags = 0;
if (S.first_of_the_wrap){
flags |= RenderItemFlag_ForceEmit;
}
S.write = write_render_item(S.write, I, cs[0], BRFlag_Special_Character, flags);
S.write = write_render_item(S.write, I, cs[1], BRFlag_Special_Character, flags);
S.write = write_render_item(S.write, I, cs[2], BRFlag_Special_Character, flags);
Assert(S.write.x <= new_x);
S.write.x = new_x;
S.first_of_the_line = false;
S.first_of_the_wrap = false;
}
if (!S.skipping_whitespace && !S.behavior.do_newline){
S.first_of_the_line = false;
}
}
}
S.still_looping = buffer_stringify_next(&S.stream);
}while(S.still_looping);
}
buffer_get_render_data_end:;
if (S.write.y <= params.height + S.shift_y || S.write.item == params.items){
S.write = write_render_item(S.write, S.size, ' ', 0, false);
}
*params.count = (i32)(S.write.item - params.items);
Assert(*params.count <= params.max);
S_stop.status = BLStatus_Finished;
DrReturn(S_stop);
}
#undef DrYield
#undef DrReturn
#undef DrCase
internal Buffer_Chunk_Position
buffer_get_chunk_position(String_Const_u8_Array chunks, i32 buffer_size, i32 real_pos){
Buffer_Chunk_Position pos = {};
pos.real_pos = real_pos;
pos.chunk_pos = real_pos;
if (pos.real_pos != buffer_size){
for (;(imem)(chunks.vals[pos.chunk_index].size) <= pos.chunk_pos;){
Assert(pos.chunk_index < chunks.count);
pos.chunk_pos -= (i32)chunks.vals[pos.chunk_index].size;
pos.chunk_index += 1;
}
}
else{
pos.chunk_index = chunks.count - 1;
pos.chunk_pos = (i32)chunks.vals[pos.chunk_index].size;
}
return(pos);
}
internal i32
buffer_chunk_position_iterate(String_Const_u8_Array chunks, Buffer_Chunk_Position *pos, Scan_Direction direction){
i32 past_end = 0;
pos->real_pos += direction;
pos->chunk_pos += direction;
if (pos->chunk_pos < 0){
if (pos->chunk_index == 0){
past_end = -1;
}
else{
pos->chunk_index -= 1;
pos->chunk_pos = (i32)chunks.vals[pos->chunk_index].size - 1;
}
}
else if (pos->chunk_pos >= (imem)(chunks.vals[pos->chunk_index].size)){
pos->chunk_index += 1;
if (pos->chunk_index == chunks.count){
past_end = 1;
}
else{
pos->chunk_pos = 0;
}
}
return(past_end);
}
// BOTTOM
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