Working on the buffer
This commit is contained in:
Krzosa Karol
@@ -17,31 +17,95 @@ struct Range {
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};
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struct Buffer {
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Allocator allocator;
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U16 *data;
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Int len;
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Int cap;
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U16 *data;
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Int len;
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Int cap;
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Array<Int> line_starts;
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};
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Int GetSize(Range range) {
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Assert(range.max >= range.min);
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Int result = range.max - range.min;
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return result;
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}
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String16 GetString(Buffer &buffer, Range range = {0, INT64_MAX}) {
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range.min = Clamp(range.min, (Int)0, buffer.len);
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range.max = Clamp(range.max, (Int)0, buffer.len);
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String16 result = {(wchar_t *)buffer.data + range.min, GetSize(range)};
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return result;
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}
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Range GetEndAsRange(Buffer &buffer) {
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Range result = {buffer.len, buffer.len};
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return result;
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}
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Range GetBeginAsRange(Buffer &buffer) {
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Range result = {0, 0};
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return result;
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}
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Range GetRange(Buffer &buffer) {
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Range result = {0, buffer.len};
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return result;
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}
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Range GetLine(Buffer &buffer, Int line) {
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Range result = {0, buffer.len};
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result.min = buffer.line_starts[line];
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if (buffer.line_starts.len < line + 1) {
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result.max = buffer.line_starts[line + 1];
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}
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return result;
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}
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Int GetLineNumber(Buffer &buffer, Int pos) {
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// @optimize: binary search
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Add(&buffer.line_starts, buffer.len);
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Int result = 0;
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for (Int i = 0; i < buffer.line_starts.len - 1; i += 1) {
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Range range = {buffer.line_starts[i], buffer.line_starts[i + 1]};
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if (pos >= range.min && pos < range.max) {
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result = i;
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break;
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}
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}
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Pop(&buffer.line_starts);
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return result;
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}
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void InitBuffer(Allocator allocator, Buffer *buffer) {
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buffer->cap = 4096;
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buffer->data = AllocArray(allocator, U16, buffer->cap);
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buffer->allocator = allocator;
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buffer->cap = 4096;
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buffer->data = AllocArray(allocator, U16, buffer->cap);
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buffer->line_starts.allocator = allocator;
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Add(&buffer->line_starts, (Int)0);
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}
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void Grow(Buffer *buffer, Int change_size) {
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Int new_size = buffer->len + change_size;
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if (new_size > buffer->cap) {
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Int outside = new_size - buffer->cap;
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Int new_cap = (buffer->cap + outside) * 2;
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U16 *new_array = AllocArray(buffer->allocator, U16, new_cap);
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Allocator alo = buffer->line_starts.allocator;
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Int outside = new_size - buffer->cap;
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Int new_cap = (buffer->cap + outside) * 2;
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U16 *new_array = AllocArray(alo, U16, new_cap);
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MemoryCopy(new_array, buffer->data, buffer->len * sizeof(U16));
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Dealloc(buffer->allocator, &buffer->data);
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Dealloc(alo, &buffer->data);
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buffer->cap = new_cap;
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buffer->data = new_array;
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}
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}
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void OffsetAllLinesPast(Buffer *buffer, Int line, Int *_offset) {
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Int offset = *_offset;
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*_offset = 0;
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if (offset == 0) return;
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for (Int i = line; i < buffer->line_starts.len; i += 1) {
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buffer->line_starts[i] += offset;
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}
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}
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void ReplaceText(Buffer *buffer, Range range, String16 string) {
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Assert(range.max >= range.min);
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Assert(range.max >= 0 && range.max <= buffer->len);
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@@ -58,35 +122,113 @@ void ReplaceText(Buffer *buffer, Range range, String16 string) {
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U16 *end_remove = begin_remove + range_size;
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Int remain_len = buffer->len - (range.min + range_size);
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Int new_buffer_len = buffer->len + change_size;
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Array<Int> &ls = buffer->line_starts;
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Int min_line_number = GetLineNumber(*buffer, range.min);
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Assert(min_line_number < ls.len);
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{
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// Update line starts with removed string
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// for (Int i = range.min; i < range.max; i += 1) {
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// }
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// @todo fuck I need to update all lines after edition point
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// Update line starts with added string
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Int line_update_counter = 0;
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Int nl = min_line_number + 1;
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for (Int i = 0; i < string.len; i += 1) {
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nl = min_line_number + 1;
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bool next_line_valid = nl < ls.len;
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if (string[i] == L'\n') {
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Int new_line_pos = range.min + i + 1;
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line_update_counter += 1;
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Insert(&ls, new_line_pos, nl);
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OffsetAllLinesPast(buffer, nl + 1, &line_update_counter);
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min_line_number = nl;
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} else if (next_line_valid) {
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line_update_counter += 1;
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}
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}
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OffsetAllLinesPast(buffer, nl, &line_update_counter);
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}
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U16 *begin_add = begin_remove;
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U16 *end_add = begin_add + string.len;
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MemoryMove(end_add, end_remove, remain_len * sizeof(U16));
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MemoryCopy(begin_add, string.data, string.len * sizeof(U16));
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buffer->len += change_size;
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}
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Int GetSize(Range range) {
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Assert(range.max >= range.min);
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Int result = range.max - range.min;
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return result;
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}
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String16 GetString(Buffer &buffer, Range range = {0, INT64_MAX}) {
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range.min = Clamp(range.min, (Int)0, buffer.len);
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range.max = Clamp(range.max, (Int)0, buffer.len);
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String16 result = {(wchar_t *)buffer.data + range.min, GetSize(range)};
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return result;
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buffer->len = new_buffer_len;
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}
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void TestBuffer() {
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Scratch scratch;
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Buffer buffer = {};
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{
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Buffer buffer = {};
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InitBuffer(scratch, &buffer);
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Assert(buffer.line_starts.len == 1);
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String16 test_string = L"Thing itself";
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{
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ReplaceText(&buffer, {{}, {}}, test_string);
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Assert(buffer.cap == 4096);
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Assert(buffer.len == 12);
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String16 a = GetString(buffer);
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Assert(a == test_string);
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Assert(buffer.line_starts.len == 1);
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Assert(buffer.line_starts[0] == 0);
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Assert(GetLineNumber(buffer, 4) == 0);
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}
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{
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ReplaceText(&buffer, {0, 5}, L"");
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Assert(buffer.cap == 4096);
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Assert(buffer.len == 12 - 5);
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String16 a = GetString(buffer);
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Assert(a == L" itself");
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Assert(buffer.line_starts.len == 1);
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Assert(buffer.line_starts[0] == 0);
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Assert(GetLineNumber(buffer, 4) == 0);
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}
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{
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ReplaceText(&buffer, GetEndAsRange(buffer), L" and");
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Assert(buffer.cap == 4096);
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Assert(buffer.len == 12 - 5 + 4);
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String16 a = GetString(buffer);
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Assert(a == L" itself and");
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Assert(buffer.line_starts.len == 1);
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Assert(buffer.line_starts[0] == 0);
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Assert(GetLineNumber(buffer, 4) == 0);
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}
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{
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ReplaceText(&buffer, GetRange(buffer), L"");
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Assert(buffer.cap == 4096);
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Assert(buffer.len == 0);
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String16 a = GetString(buffer);
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Assert(a == L"");
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Assert(buffer.line_starts.len == 1);
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Assert(buffer.line_starts[0] == 0);
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}
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{
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ReplaceText(&buffer, GetEndAsRange(buffer), L"Memes and other\nthings");
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Assert(buffer.line_starts.len == 2);
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Assert(GetLineNumber(buffer, 17) == 1);
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Assert(GetLineNumber(buffer, 16) == 1);
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Assert(GetLineNumber(buffer, 15) == 0);
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Assert(buffer.data[15] == L'\n');
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Assert(buffer.data[16] == L't');
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String16 test_string = L"Thing itself";
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InitBuffer(scratch, &buffer);
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ReplaceText(&buffer, {{}, {}}, test_string);
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Assert(buffer.cap == 4096);
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Assert(buffer.len == 12);
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String16 a = GetString(buffer);
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Assert(a == test_string);
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ReplaceText(&buffer, GetBeginAsRange(buffer), L"Things as is\nand stuff\n");
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Assert(buffer.line_starts.len == 4);
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Assert(GetLineNumber(buffer, 12) == 0);
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Assert(buffer.data[12] == L'\n');
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Assert(GetLineNumber(buffer, 13) == 1);
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Assert(GetLineNumber(buffer, 21) == 1);
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Assert(GetLineNumber(buffer, 22) == 1);
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Assert(buffer.data[22] == L'\n');
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Assert(GetLineNumber(buffer, 23) == 2);
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Assert(GetLineNumber(buffer, 37) == 2);
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Assert(GetLineNumber(buffer, 38) == 2);
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Assert(buffer.data[38] == L'\n');
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Assert(GetLineNumber(buffer, 39) == 3);
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Assert(buffer.data[39] == L't');
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}
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}
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}
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