330 lines
9.5 KiB
C++
330 lines
9.5 KiB
C++
/*
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* Mr. 4th Dimention - Allen Webster
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* Four Tech
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*
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* public domain -- no warranty is offered or implied; use this code at your own risk
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*
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* 23.10.2015
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*
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* Buffer data object
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* type - Gap Buffer
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*
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*/
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// TOP
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typedef struct{
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char *data;
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int size1, gap_size, size2, max;
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float *line_widths;
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int *line_starts;
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int line_count;
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int line_max;
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int widths_max;
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} Gap_Buffer;
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inline_4tech int
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buffer_size(Gap_Buffer *buffer){
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int size;
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size = buffer->size1 + buffer->size2;
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return(size);
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}
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inline_4tech void
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buffer_initialize(Gap_Buffer *buffer, char *data, int size){
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int osize1, size1, size2;
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assert_4tech(buffer->max >= size);
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size2 = size >> 1;
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size1 = osize1 = size - size2;
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if (size1 > 0){
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size1 = eol_convert_in(buffer->data, data, size1);
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if (size2 > 0){
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size2 = eol_convert_in(buffer->data + size1, data + osize1, size2);
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}
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}
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buffer->size1 = size1;
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buffer->size2 = size2;
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buffer->gap_size = buffer->max - size1 - size2;
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memmove_4tech(buffer->data + size1 + buffer->gap_size, buffer->data + size1, size2);
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}
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internal_4tech void*
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buffer_relocate(Gap_Buffer *buffer, char *new_data, int new_max){
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void *result;
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int new_gap_size;
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assert_4tech(new_max >= buffer_size(buffer));
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result = buffer->data;
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new_gap_size = new_max - buffer_size(buffer);
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memcpy_4tech(new_data, buffer->data, buffer->size1);
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memcpy_4tech(new_data + buffer->size1 + new_gap_size, buffer->data + buffer->size1 + buffer->gap_size, buffer->size2);
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buffer->data = new_data;
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buffer->gap_size = new_gap_size;
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buffer->max = new_max;
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return(result);
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}
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typedef struct{
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Gap_Buffer *buffer;
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char *data, *base;
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int absolute_pos;
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int pos, end;
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int size;
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int page_size;
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int separated;
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} Gap_Buffer_Stringify_Loop;
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inline_4tech Gap_Buffer_Stringify_Loop
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buffer_stringify_loop(Gap_Buffer *buffer, int start, int end, int page_size){
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Gap_Buffer_Stringify_Loop result;
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if (0 <= start && start < end && end <= buffer->size1 + buffer->size2){
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result.buffer = buffer;
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result.base = buffer->data;
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result.page_size = page_size;
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result.absolute_pos = start;
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if (end <= buffer->size1) result.end = end;
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else result.end = end + buffer->gap_size;
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if (start < buffer->size1){
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if (end <= buffer->size1) result.separated = 0;
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else result.separated = 1;
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result.pos = start;
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}
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else{
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result.separated = 0;
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result.pos = start + buffer->gap_size;
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}
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if (result.separated) result.size = buffer->size1 - start;
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else result.size = end - start;
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if (result.size > page_size) result.size = page_size;
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result.data = buffer->data + result.pos;
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}
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else result.buffer = 0;
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return(result);
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}
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inline_4tech int
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buffer_stringify_good(Gap_Buffer_Stringify_Loop *loop){
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int result;
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result = (loop->buffer != 0);
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return(result);
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}
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inline_4tech void
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buffer_stringify_next(Gap_Buffer_Stringify_Loop *loop){
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int size1, temp_end;
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if (loop->separated){
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size1 = loop->buffer->size1;
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if (loop->pos + loop->size == size1){
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loop->separated = 0;
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loop->pos = loop->buffer->gap_size + size1;
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loop->absolute_pos = size1;
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temp_end = loop->end;
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}
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else{
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loop->pos += loop->page_size;
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loop->absolute_pos += loop->page_size;
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temp_end = size1;
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}
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}
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else{
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if (loop->pos + loop->size == loop->end){
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loop->buffer = 0;
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temp_end = loop->pos;
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}
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else{
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loop->pos += loop->page_size;
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loop->absolute_pos += loop->page_size;
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temp_end = loop->end;
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}
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}
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loop->size = temp_end - loop->pos;
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if (loop->size > loop->page_size) loop->size = loop->page_size;
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loop->data = loop->base + loop->pos;
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}
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typedef struct{
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Gap_Buffer *buffer;
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char *data, *base;
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int pos, end;
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int size;
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int absolute_pos;
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int page_size;
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int separated;
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} Gap_Buffer_Backify_Loop;
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inline_4tech Gap_Buffer_Backify_Loop
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buffer_backify_loop(Gap_Buffer *buffer, int start, int end, int page_size){
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Gap_Buffer_Backify_Loop result;
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int chunk2_start;
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++start;
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if (0 <= end && end < start && start <= buffer->size1 + buffer->size2){
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chunk2_start = buffer->size1 + buffer->gap_size;
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result.buffer = buffer;
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result.base = buffer->data;
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result.page_size = page_size;
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if (end < buffer->size1) result.end = end;
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else result.end = end + buffer->gap_size;
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if (start <= buffer->size1){
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result.separated = 0;
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result.pos = start - page_size;
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}
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else{
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if (end < buffer->size1) result.separated = 1;
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else result.separated = 0;
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result.pos = start - page_size + buffer->gap_size;
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}
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if (result.separated){
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if (result.pos < chunk2_start) result.pos = chunk2_start;
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}
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else{
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if (result.pos < result.end) result.pos = result.end;
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}
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result.size = start - result.pos;
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result.absolute_pos = result.pos;
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if (result.absolute_pos > buffer->size1) result.absolute_pos -= buffer->gap_size;
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result.data = result.base + result.pos;
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}
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else result.buffer = 0;
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return(result);
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}
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inline_4tech int
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buffer_backify_good(Gap_Buffer_Backify_Loop *loop){
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int result;
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result = (loop->buffer != 0);
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return(result);
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}
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inline_4tech void
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buffer_backify_next(Gap_Buffer_Backify_Loop *loop){
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Gap_Buffer *buffer;
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int temp_end;
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int chunk2_start;
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buffer = loop->buffer;
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chunk2_start = buffer->size1 + buffer->gap_size;
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if (loop->separated){
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if (loop->pos == chunk2_start){
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loop->separated = 0;
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temp_end = buffer->size1;
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loop->pos = temp_end - loop->page_size;
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loop->absolute_pos = loop->pos;
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if (loop->pos < loop->end){
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loop->absolute_pos += (loop->end - loop->pos);
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loop->pos = loop->end;
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}
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}
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else{
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temp_end = loop->pos;
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loop->pos -= loop->page_size;
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loop->absolute_pos -= loop->page_size;
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if (loop->pos < chunk2_start){
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loop->pos = chunk2_start;
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loop->absolute_pos = buffer->size1;
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}
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}
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}
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else{
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if (loop->pos == loop->end){
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temp_end = 0;
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loop->buffer = 0;
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}
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else{
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temp_end = loop->pos;
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loop->pos -= loop->page_size;
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loop->absolute_pos -= loop->page_size;
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if (loop->pos < loop->end){
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loop->absolute_pos += (loop->end - loop->pos);
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loop->pos = loop->end;
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}
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}
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}
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loop->size = temp_end - loop->pos;
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loop->data = loop->base + loop->pos;
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}
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internal_4tech int
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buffer_replace_range(Gap_Buffer *buffer, int start, int end, char *str, int len, int *shift_amount){
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char *data;
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int result;
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int size;
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int move_size;
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size = buffer_size(buffer);
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assert_4tech(0 <= start);
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assert_4tech(start <= end);
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assert_4tech(end <= size);
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*shift_amount = (len - (end - start));
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if (*shift_amount + size <= buffer->max){
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data = buffer->data;
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if (end < buffer->size1){
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move_size = buffer->size1 - end;
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memmove_4tech(data + buffer->size1 + buffer->gap_size - move_size, data + end, move_size);
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buffer->size1 -= move_size;
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buffer->size2 += move_size;
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}
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if (start > buffer->size1){
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move_size = start - buffer->size1;
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memmove_4tech(data + buffer->size1, data + buffer->size1 + buffer->gap_size, move_size);
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buffer->size1 += move_size;
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buffer->size2 -= move_size;
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}
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memcpy_4tech(data + start, str, len);
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buffer->size2 = size - end;
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buffer->size1 = start + len;
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buffer->gap_size -= *shift_amount;
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assert_4tech(buffer->size1 + buffer->size2 == size + *shift_amount);
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assert_4tech(buffer->size1 + buffer->gap_size + buffer->size2 == buffer->max);
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result = 0;
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}
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else{
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result = *shift_amount + size;
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}
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return(result);
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}
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// NOTE(allen): This could should be optimized for Gap_Buffer
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internal_4tech int
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buffer_batch_edit_step(Buffer_Batch_State *state, Gap_Buffer *buffer, Buffer_Edit *sorted_edits, char *strings, int edit_count){
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Buffer_Edit *edit;
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int i, result;
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int shift_total, shift_amount;
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result = 0;
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shift_total = state->shift_total;
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i = state->i;
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edit = sorted_edits + i;
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for (; i < edit_count; ++i, ++edit){
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result = buffer_replace_range(buffer, edit->start + shift_total, edit->end + shift_total,
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strings + edit->str_start, edit->len, &shift_amount);
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if (result) break;
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shift_total += shift_amount;
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}
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state->shift_total = shift_total;
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state->i = i;
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return(result);
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}
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// BOTTOM
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