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-rw-r--r--buffer.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/buffer.c b/buffer.c
index baa553f..4b3535c 100644
--- a/buffer.c
+++ b/buffer.c
@@ -137,6 +137,24 @@ static void buffer_validate_cursor(TextBuffer *buffer) {
buffer_pos_validate(buffer, &buffer->selection_pos);
}
+// update *pos, given that nchars characters were deleted at del_pos.
+static void buffer_pos_handle_deleted_chars(BufferPos *pos, BufferPos del_pos, u32 nchars) {
+ if (pos->line != del_pos.line) return;
+
+ if (pos->index >= del_pos.index + nchars) {
+ pos->index -= nchars;
+ } else if (pos->index >= del_pos.index) {
+ pos->index = del_pos.index;
+ }
+}
+static void buffer_pos_handle_inserted_chars(BufferPos *pos, BufferPos ins_pos, u32 nchars) {
+ if (pos->line != ins_pos.line) return;
+
+ if (pos->index >= ins_pos.index) {
+ pos->index += nchars;
+ }
+}
+
static bool buffer_pos_valid(TextBuffer *buffer, BufferPos p) {
return p.line < buffer->nlines && p.index <= buffer->lines[p.line].len;
}
@@ -1375,6 +1393,8 @@ BufferPos buffer_insert_text_at_pos(TextBuffer *buffer, BufferPos pos, String32
u32 new_len = old_len + text_line_len;
if (new_len > old_len) { // handles both overflow and empty text lines
if (buffer_line_set_len(buffer, line, new_len)) {
+ buffer_pos_handle_inserted_chars(&buffer->cursor_pos, (BufferPos){line_idx, index}, text_line_len);
+ buffer_pos_handle_inserted_chars(&buffer->selection_pos, (BufferPos){line_idx, index}, text_line_len);
// make space for text
memmove(line->str + index + (new_len - old_len),
line->str + index,
@@ -1650,6 +1670,8 @@ void buffer_delete_chars_at_pos(TextBuffer *buffer, BufferPos pos, i64 nchars_)
}
} else {
// just delete characters from this line
+ buffer_pos_handle_deleted_chars(&buffer->cursor_pos, pos, nchars);
+ buffer_pos_handle_deleted_chars(&buffer->selection_pos, pos, nchars);
memmove(line->str + index, line->str + index + nchars, (size_t)(line->len - (nchars + index)) * sizeof(char32_t));
line->len -= nchars;
}