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AK: Add case insensitive version of starts_with

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This commit is contained in:
Luke 2020-07-18 17:59:38 +01:00 committed by Andreas Kling
parent ccc929dcf9
commit a5ecb9bd6b
Notes: sideshowbarker 2024-07-19 04:42:15 +09:00 
Author: https://github.com/Lubrsi
Commit: https://github.com/SerenityOS/serenity/commit/a5ecb9bd6b2
Pull-request: https://github.com/SerenityOS/serenity/pull/2842
11 changed files with 53 additions and 20 deletions
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5
AK/FlyString.cpp
View file

@ -99,6 +99,11 @@ bool FlyString::equals_ignoring_case(const StringView& other) const
return StringUtils::equals_ignoring_case(view(), other);
}
bool FlyString::starts_with(const StringView& str, CaseSensitivity case_sensitivity) const
{
return StringUtils::starts_with(view(), str, case_sensitivity);
}
bool FlyString::ends_with(const StringView& str, CaseSensitivity case_sensitivity) const
{
return StringUtils::ends_with(view(), str, case_sensitivity);

1
AK/FlyString.h
View file

@ -85,6 +85,7 @@ public:
Optional<int> to_int() const;
bool equals_ignoring_case(const StringView&) const;
bool starts_with(const StringView&, CaseSensitivity = CaseSensitivity::CaseSensitive) const;
bool ends_with(const StringView&, CaseSensitivity = CaseSensitivity::CaseSensitive) const;
static void did_destroy_impl(Badge<StringImpl>, StringImpl&);

10
AK/String.cpp
View file

@ -260,15 +260,9 @@ String String::format(const char* fmt, ...)
return builder.to_string();
}
bool String::starts_with(const StringView& str) const
bool String::starts_with(const StringView& str, CaseSensitivity case_sensitivity) const
{
if (str.is_empty())
return true;
if (is_empty())
return false;
if (str.length() > length())
return false;
return !memcmp(characters(), str.characters_without_null_termination(), str.length());
return StringUtils::starts_with(*this, str, case_sensitivity);
}
bool String::starts_with(char ch) const

2
AK/String.h
View file

@ -145,7 +145,7 @@ public:
ConstIterator begin() const { return characters(); }
ConstIterator end() const { return begin() + length(); }
bool starts_with(const StringView&) const;
bool starts_with(const StringView&, CaseSensitivity = CaseSensitivity::CaseSensitive) const;
bool ends_with(const StringView&, CaseSensitivity = CaseSensitivity::CaseSensitive) const;
bool starts_with(char) const;
bool ends_with(char) const;

25
AK/StringUtils.cpp
View file

@ -202,6 +202,31 @@ bool ends_with(const StringView& str, const StringView& end, CaseSensitivity cas
return true;
}
bool starts_with(const StringView& str, const StringView& start, CaseSensitivity case_sensitivity)
{
if (start.is_empty())
return true;
if (str.is_empty())
return false;
if (start.length() > str.length())
return false;
if (str.characters_without_null_termination() == start.characters_without_null_termination())
return true;
if (case_sensitivity == CaseSensitivity::CaseSensitive)
return !memcmp(str.characters_without_null_termination(), start.characters_without_null_termination(), start.length());
auto str_chars = str.characters_without_null_termination();
auto start_chars = start.characters_without_null_termination();
size_t si = 0;
for (size_t starti = 0; starti < start.length(); ++si, ++starti) {
if (to_lowercase(str_chars[si]) != to_lowercase(start_chars[starti]))
return false;
}
return true;
}
}
}

1
AK/StringUtils.h
View file

@ -44,6 +44,7 @@ Optional<unsigned> convert_to_uint(const StringView&);
Optional<unsigned> convert_to_uint_from_hex(const StringView&);
bool equals_ignoring_case(const StringView&, const StringView&);
bool ends_with(const StringView& a, const StringView& b, CaseSensitivity);
bool starts_with(const StringView&, const StringView&, CaseSensitivity);
}
}

12
AK/StringView.cpp
View file

@ -147,17 +147,9 @@ bool StringView::starts_with(char ch) const
return ch == characters_without_null_termination()[0];
}
bool StringView::starts_with(const StringView& str) const
bool StringView::starts_with(const StringView& str, CaseSensitivity case_sensitivity) const
{
if (str.is_empty())
return true;
if (is_empty())
return false;
if (str.length() > length())
return false;
if (characters_without_null_termination() == str.characters_without_null_termination())
return true;
return !memcmp(characters_without_null_termination(), str.characters_without_null_termination(), str.length());
return StringUtils::starts_with(*this, str, case_sensitivity);
}
bool StringView::ends_with(char ch) const

2
AK/StringView.h
View file

@ -72,7 +72,7 @@ public:
unsigned hash() const;
bool starts_with(const StringView&) const;
bool starts_with(const StringView&, CaseSensitivity = CaseSensitivity::CaseSensitive) const;
bool ends_with(const StringView&, CaseSensitivity = CaseSensitivity::CaseSensitive) const;
bool starts_with(char) const;
bool ends_with(char) const;

2
AK/Tests/TestString.cpp
View file

@ -87,6 +87,8 @@ TEST_CASE(starts_with)
EXPECT(!test_string.starts_with('B'));
EXPECT(test_string.starts_with("ABCDEF"));
EXPECT(!test_string.starts_with("DEF"));
EXPECT(test_string.starts_with("abc", CaseSensitivity::CaseInsensitive));
EXPECT(!test_string.starts_with("abc", CaseSensitivity::CaseSensitive));
}
TEST_CASE(ends_with)

11
AK/Tests/TestStringUtils.cpp
View file

@ -164,4 +164,15 @@ TEST_CASE(ends_with)
EXPECT(!AK::StringUtils::ends_with(test_string, "def", CaseSensitivity::CaseSensitive));
}
TEST_CASE(starts_with)
{
String test_string = "ABCDEF";
EXPECT(AK::StringUtils::starts_with(test_string, "ABC", CaseSensitivity::CaseSensitive));
EXPECT(AK::StringUtils::starts_with(test_string, "ABCDEF", CaseSensitivity::CaseSensitive));
EXPECT(!AK::StringUtils::starts_with(test_string, "BCDEF", CaseSensitivity::CaseSensitive));
EXPECT(!AK::StringUtils::starts_with(test_string, "ABCDEFG", CaseSensitivity::CaseSensitive));
EXPECT(AK::StringUtils::starts_with(test_string, "abc", CaseSensitivity::CaseInsensitive));
EXPECT(!AK::StringUtils::starts_with(test_string, "abc", CaseSensitivity::CaseSensitive));
}
TEST_MAIN(StringUtils)

2
AK/Tests/TestStringView.cpp
View file

@ -68,6 +68,8 @@ TEST_CASE(starts_with)
EXPECT(test_string_view.starts_with("AB"));
EXPECT(test_string_view.starts_with("ABCDEF"));
EXPECT(!test_string_view.starts_with("DEF"));
EXPECT(test_string_view.starts_with("abc", CaseSensitivity::CaseInsensitive));
EXPECT(!test_string_view.starts_with("abc", CaseSensitivity::CaseSensitive));
}
TEST_CASE(ends_with)