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AK: Implement method to convert a String/StringView to title case

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This implementation preserves consecutive spaces in the orginal string.
This commit is contained in:
Timothy Flynn 2021-08-26 13:55:41 -04:00 committed by Linus Groh
parent d2af27d2d0
commit 262e412634
Notes: sideshowbarker 2024-07-18 05:16:02 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/262e4126346
Pull-request: https://github.com/SerenityOS/serenity/pull/9599
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/davidot
Reviewed-by: https://github.com/linusg ✅
7 changed files with 43 additions and 0 deletions
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5
AK/String.cpp
View file

@ -446,6 +446,11 @@ String String::to_snakecase() const
return StringUtils::to_snakecase(*this);
}
String String::to_titlecase() const
{
return StringUtils::to_titlecase(*this);
}
bool operator<(const char* characters, const String& string)
{
if (!characters)

1
AK/String.h
View file

@ -120,6 +120,7 @@ public:
[[nodiscard]] String to_lowercase() const;
[[nodiscard]] String to_uppercase() const;
[[nodiscard]] String to_snakecase() const;
[[nodiscard]] String to_titlecase() const;
[[nodiscard]] bool is_whitespace() const { return StringUtils::is_whitespace(*this); }

16
AK/StringUtils.cpp
View file

@ -411,6 +411,22 @@ String to_snakecase(const StringView& str)
return builder.to_string();
}
String to_titlecase(StringView const& str)
{
StringBuilder builder;
bool next_is_upper = true;
for (auto ch : str) {
if (next_is_upper)
builder.append_code_point(to_ascii_uppercase(ch));
else
builder.append_code_point(to_ascii_lowercase(ch));
next_is_upper = ch == ' ';
}
return builder.to_string();
}
}
}

1
AK/StringUtils.h
View file

@ -69,6 +69,7 @@ enum class SearchDirection {
Optional<size_t> find_any_of(StringView const& haystack, StringView const& needles, SearchDirection);
String to_snakecase(const StringView&);
String to_titlecase(StringView const&);
}

5
AK/StringView.cpp
View file

@ -183,6 +183,11 @@ String StringView::to_uppercase_string() const
return StringImpl::create_uppercased(characters_without_null_termination(), length());
}
String StringView::to_titlecase_string() const
{
return StringUtils::to_titlecase(*this);
}
StringView StringView::substring_view_starting_from_substring(const StringView& substring) const
{
const char* remaining_characters = substring.characters_without_null_termination();

1
AK/StringView.h
View file

@ -85,6 +85,7 @@ public:
[[nodiscard]] String to_lowercase_string() const;
[[nodiscard]] String to_uppercase_string() const;
[[nodiscard]] String to_titlecase_string() const;
[[nodiscard]] Optional<size_t> find(char needle, size_t start = 0) const { return StringUtils::find(*this, needle, start); }
[[nodiscard]] Optional<size_t> find(StringView const& needle, size_t start = 0) const { return StringUtils::find(*this, needle, start); }

14
Tests/AK/TestStringUtils.cpp
View file

@ -304,3 +304,17 @@ TEST_CASE(to_snakecase)
EXPECT_EQ(AK::StringUtils::to_snakecase("FBar"), "f_bar");
EXPECT_EQ(AK::StringUtils::to_snakecase("FooB"), "foo_b");
}
TEST_CASE(to_titlecase)
{
EXPECT_EQ(AK::StringUtils::to_titlecase(""sv), ""sv);
EXPECT_EQ(AK::StringUtils::to_titlecase("f"sv), "F"sv);
EXPECT_EQ(AK::StringUtils::to_titlecase("foobar"sv), "Foobar"sv);
EXPECT_EQ(AK::StringUtils::to_titlecase("Foobar"sv), "Foobar"sv);
EXPECT_EQ(AK::StringUtils::to_titlecase("FOOBAR"sv), "Foobar"sv);
EXPECT_EQ(AK::StringUtils::to_titlecase("foo bar"sv), "Foo Bar"sv);
EXPECT_EQ(AK::StringUtils::to_titlecase("foo bAR"sv), "Foo Bar"sv);
EXPECT_EQ(AK::StringUtils::to_titlecase("foo bar"sv), "Foo Bar"sv);
EXPECT_EQ(AK::StringUtils::to_titlecase("foo bar"sv), "Foo Bar"sv);
EXPECT_EQ(AK::StringUtils::to_titlecase(" foo bar "sv), " Foo Bar "sv);
}