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LibUnicode: Use iterative text segmentation algorithms for titlecasing

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Timothy Flynn 2023-02-15 10:14:22 -05:00 • committed by Linus Groh
parent 7cb956d17b
commit 6ce7ec2eb3
1 changed files with 10 additions and 9 deletions
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19
Userland/Libraries/LibUnicode/UnicodeUtils.cpp
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@ -274,10 +274,6 @@ ErrorOr<void> build_titlecase_string([[maybe_unused]] Utf8View code_points, [[ma
// the word boundary. If F exists, map F to Titlecase_Mapping(F); then map all characters C between
// F and the following word boundary to Lowercase_Mapping(C).
auto boundaries = find_word_segmentation_boundaries(code_points);
if (boundaries.is_empty())
return {};
auto first_cased_code_point_after_boundary = [&](auto boundary, auto next_boundary) -> Optional<Utf8CodePointIterator> {
auto it = code_points.iterator_at_byte_offset_without_validation(boundary);
auto end = code_points.iterator_at_byte_offset_without_validation(next_boundary);
@ -302,11 +298,14 @@ ErrorOr<void> build_titlecase_string([[maybe_unused]] Utf8View code_points, [[ma
return {};
};
for (size_t i = 0; i < boundaries.size() - 1; ++i) {
auto boundary = boundaries[i];
auto next_boundary = boundaries[i + 1];
size_t boundary = 0;
if (auto it = first_cased_code_point_after_boundary(boundary, next_boundary); it.has_value()) {
while (true) {
auto next_boundary = next_word_segmentation_boundary(code_points, boundary);
if (!next_boundary.has_value())
break;
if (auto it = first_cased_code_point_after_boundary(boundary, *next_boundary); it.has_value()) {
auto code_point = *it.value();
auto code_point_offset = code_points.byte_offset_of(*it);
auto code_point_length = it->underlying_code_point_length_in_bytes();
@ -318,8 +317,10 @@ ErrorOr<void> build_titlecase_string([[maybe_unused]] Utf8View code_points, [[ma
boundary = code_point_offset + code_point_length;
}
auto substring_to_lowercase = code_points.substring_view(boundary, next_boundary - boundary);
auto substring_to_lowercase = code_points.substring_view(boundary, *next_boundary - boundary);
TRY(build_lowercase_string(substring_to_lowercase, builder, locale));
boundary = *next_boundary;
}
return {};