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AK: Move trim_whitespace() into StringUtils and add it to StringView

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No behaviour change; also patches use of `String::TrimMode` in LibJS.
This commit is contained in:
AnotherTest 2020-09-20 18:05:04 +04:30 • committed by Andreas Kling
parent 50e9000b40
commit 5fbec2b003
6 changed files with 56 additions and 47 deletions
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37
AK/StringUtils.cpp
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@ -227,6 +227,43 @@ bool starts_with(const StringView& str, const StringView& start, CaseSensitivity
return true;
}
StringView trim_whitespace(const StringView& str, TrimMode mode)
{
auto is_whitespace_character = [](char ch) -> bool {
return ch == '\t'
|| ch == '\n'
|| ch == '\v'
|| ch == '\f'
|| ch == '\r'
|| ch == ' ';
};
size_t substring_start = 0;
size_t substring_length = str.length();
if (mode == TrimMode::Left || mode == TrimMode::Both) {
for (size_t i = 0; i < str.length(); ++i) {
if (substring_length == 0)
return "";
if (!is_whitespace_character(str[i]))
break;
++substring_start;
--substring_length;
}
}
if (mode == TrimMode::Right || mode == TrimMode::Both) {
for (size_t i = str.length() - 1; i > 0; --i) {
if (substring_length == 0)
return "";
if (!is_whitespace_character(str[i]))
break;
--substring_length;
}
}
return str.substring_view(substring_start, substring_length);
}
}
}