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AK: Allow propagating errors from StringView::for_each_split_view()

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MacDue 2023-02-04 17:54:55 +00:00 committed by Andreas Kling
parent b16ec1880c
commit d81a72ed78
Notes: sideshowbarker 2024-07-17 11:30:54 +09:00 
Author: https://github.com/MacDue
Commit: https://github.com/SerenityOS/serenity/commit/d81a72ed78
Pull-request: https://github.com/SerenityOS/serenity/pull/17309
Reviewed-by: https://github.com/timschumi
Reviewed-by: https://github.com/trflynn89
1 changed files with 39 additions and 26 deletions
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65
AK/StringView.h
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@ -164,40 +164,53 @@ public:
return substring_view(0, needle_begin.release_value());
}
template<VoidFunction<StringView> Callback>
void for_each_split_view(char separator, SplitBehavior split_behavior, Callback callback) const
template<typename Callback>
auto for_each_split_view(char separator, SplitBehavior split_behavior, Callback callback) const
{
StringView seperator_view { &separator, 1 };
for_each_split_view(seperator_view, split_behavior, callback);
return for_each_split_view(seperator_view, split_behavior, callback);
}
template<VoidFunction<StringView> Callback>
void for_each_split_view(StringView separator, SplitBehavior split_behavior, Callback callback) const
template<typename Callback>
auto for_each_split_view(StringView separator, SplitBehavior split_behavior, Callback callback) const
{
VERIFY(!separator.is_empty());
// FIXME: This can't go in the template header since declval won't allow the incomplete StringView type.
using CallbackReturn = decltype(declval<Callback>()(StringView {}));
constexpr auto ReturnsErrorOr = IsSpecializationOf<CallbackReturn, ErrorOr>;
using ReturnType = Conditional<ReturnsErrorOr, ErrorOr<void>, void>;
return [&]() -> ReturnType {
if (is_empty())
return ReturnType();
if (is_empty())
return;
StringView view { *this };
auto maybe_separator_index = find(separator);
bool keep_empty = has_flag(split_behavior, SplitBehavior::KeepEmpty);
bool keep_separator = has_flag(split_behavior, SplitBehavior::KeepTrailingSeparator);
while (maybe_separator_index.has_value()) {
auto separator_index = maybe_separator_index.value();
auto part_with_separator = view.substring_view(0, separator_index + separator.length());
if (keep_empty || separator_index > 0) {
if (keep_separator)
callback(part_with_separator);
else
callback(part_with_separator.substring_view(0, separator_index));
StringView view { *this };
auto maybe_separator_index = find(separator);
bool keep_empty = has_flag(split_behavior, SplitBehavior::KeepEmpty);
bool keep_separator = has_flag(split_behavior, SplitBehavior::KeepTrailingSeparator);
while (maybe_separator_index.has_value()) {
auto separator_index = maybe_separator_index.value();
auto part_with_separator = view.substring_view(0, separator_index + separator.length());
if (keep_empty || separator_index > 0) {
auto part = part_with_separator;
if (!keep_separator)
part = part_with_separator.substring_view(0, separator_index);
if constexpr (ReturnsErrorOr)
TRY(callback(part));
else
callback(part);
}
view = view.substring_view_starting_after_substring(part_with_separator);
maybe_separator_index = view.find(separator);
}
view = view.substring_view_starting_after_substring(part_with_separator);
maybe_separator_index = view.find(separator);
}
if (keep_empty || !view.is_empty())
callback(view);
if (keep_empty || !view.is_empty()) {
if constexpr (ReturnsErrorOr)
TRY(callback(view));
else
callback(view);
}
return ReturnType();
}();
}
// Create a Vector of StringViews split by line endings. As of CommonMark