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AK: Enhance String::contains to allow case-insensitive searches

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Tom 2020-10-20 15:07:03 -06:00 • committed by Andreas Kling
parent 6413acd78c
commit 25e7225782
7 changed files with 54 additions and 8 deletions
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28
AK/StringUtils.cpp
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@ -227,6 +227,34 @@ bool starts_with(const StringView& str, const StringView& start, CaseSensitivity
return true;
}
bool contains(const StringView& str, const StringView& needle, CaseSensitivity case_sensitivity)
{
if (str.is_null() || needle.is_null() || str.is_empty() || needle.length() > str.length())
return false;
if (needle.is_empty())
return true;
auto str_chars = str.characters_without_null_termination();
auto needle_chars = needle.characters_without_null_termination();
if (case_sensitivity == CaseSensitivity::CaseSensitive)
return memmem(str_chars, str.length(), needle_chars, needle.length()) != nullptr;
auto needle_first = to_lowercase(needle_chars[0]);
size_t slen = str.length() - needle.length();
for (size_t si = 0; si < slen; si++) {
if (to_lowercase(str_chars[si]) != needle_first)
continue;
size_t ni = 1;
while (ni < needle.length()) {
if (to_lowercase(str_chars[si + ni]) != to_lowercase(needle_chars[ni]))
break;
ni++;
}
if (ni == needle.length())
return true;
}
return false;
}
StringView trim_whitespace(const StringView& str, TrimMode mode)
{
auto is_whitespace_character = [](char ch) -> bool {