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BLI_string: add BLI_str_utf8_offset_* functions that support tabs

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Useful when calculating the column the cursor will be displayed in
the text editor.
This commit is contained in:
Campbell Barton
2023-09-18 11:47:37 +10:00
parent 108dad4e52
commit ce2fa2a13e
2 changed files with 46 additions and 0 deletions
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9
source/blender/blenlib/BLI_string_utf8.h
View File

@@ -223,6 +223,15 @@ int BLI_str_utf8_offset_to_column(const char *str,
int BLI_str_utf8_offset_from_column(const char *str,
size_t str_len,
int column_target) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL(1);
int BLI_str_utf8_offset_to_column_with_tabs(const char *str,
size_t str_len,
int offset_target,
int tab_width) ATTR_WARN_UNUSED_RESULT ATTR_NONNULL(1);
int BLI_str_utf8_offset_from_column_with_tabs(const char *str,
size_t str_len,
int column_target,
int tab_width) ATTR_WARN_UNUSED_RESULT
ATTR_NONNULL(1);
/** Size in bytes. */
#define BLI_UTF8_MAX 6

37
source/blender/blenlib/intern/string_utf8.c
View File

@@ -1084,4 +1084,41 @@ int BLI_str_utf8_offset_from_column(const char *str, const size_t str_len, const
return (int)offset;
}
int BLI_str_utf8_offset_to_column_with_tabs(const char *str,
const size_t str_len,
const int offset_target,
const int tab_width)
{
BLI_assert(offset_target >= 0);
const size_t offset_target_clamp = MIN2((size_t)offset_target, str_len);
size_t offset = 0;
int column = 0;
while (offset < offset_target_clamp) {
const uint code = BLI_str_utf8_as_unicode_step(str, str_len, &offset);
/* The following line is the only change compared with #BLI_str_utf8_offset_to_column. */
column += (code == '\t') ? (tab_width - (column % tab_width)) : BLI_wcwidth_safe(code);
BLI_assert(offset <= (size_t)offset_target); /* See DOXY section comment. */
}
return column;
}
int BLI_str_utf8_offset_from_column_with_tabs(const char *str,
const size_t str_len,
const int column_target,
const int tab_width)
{
size_t offset = 0, offset_next = 0;
int column = 0;
while ((offset < str_len) && (column < column_target)) {
const uint code = BLI_str_utf8_as_unicode_step(str, str_len, &offset_next);
/* The following line is the only change compared with #BLI_str_utf8_offset_from_column. */
column += (code == '\t') ? (tab_width - (column % tab_width)) : BLI_wcwidth_safe(code);
if (column > column_target) {
break;
}
offset = offset_next;
}
return (int)offset;
}
/** \} */