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AK: Add String::replace() functionality

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This adds a replace functionality that replaces a string that contains
occurences of a "needle" by a "replacement" value. With "all_occurences"
enabled, all occurences are being replaced, otherwise only the first
occurence is being replaced.
This commit is contained in:
Emanuel Sprung 2020-04-01 21:27:39 +02:00 committed by Andreas Kling
parent 9d5d0261e1
commit 2577712a1c
Notes: sideshowbarker 2024-07-19 08:00:38 +09:00 
Author: https://github.com/lnzero1dev
Commit: https://github.com/SerenityOS/serenity/commit/2577712a1c6
Pull-request: https://github.com/SerenityOS/serenity/pull/1569
3 changed files with 62 additions and 0 deletions
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35
AK/String.cpp
View file

@ -320,6 +320,41 @@ bool String::equals_ignoring_case(const StringView& other) const
return StringUtils::equals_ignoring_case(view(), other);
}
int String::replace(const String& needle, const String& replacement, bool all_occurences)
{
if (is_empty())
return 0;
Vector<size_t> positions;
size_t start = 0, pos;
for (;;) {
const char* ptr = strstr(characters() + start, needle.characters());
if (!ptr)
break;
pos = ptr - characters();
positions.append(pos);
if (!all_occurences)
break;
start = pos + 1;
}
if (!positions.size())
return 0;
StringBuilder b;
size_t lastpos = 0;
for (auto& pos : positions) {
b.append(substring_view(lastpos, pos - lastpos));
b.append(replacement);
lastpos = pos + needle.length();
}
b.append(substring_view(lastpos, length() - lastpos));
m_impl = StringImpl::create(b.build().characters());
return positions.size();
}
String escape_html_entities(const StringView& html)
{
StringBuilder builder;

2
AK/String.h
View file

@ -214,6 +214,8 @@ public:
StringView view() const;
int replace(const String& needle, const String& replacement, bool all_occurences = false);
private:
RefPtr<StringImpl> m_impl;
};

25
AK/Tests/TestString.cpp
View file

@ -159,4 +159,29 @@ TEST_CASE(flystring)
}
}
TEST_CASE(replace)
{
String test_string = "Well, hello Friends!";
u32 replacements = test_string.replace("Friends", "Testers");
EXPECT(replacements == 1);
EXPECT(test_string == "Well, hello Testers!");
replacements = test_string.replace("ell", "e're", true);
EXPECT(replacements == 2);
EXPECT(test_string == "We're, he'reo Testers!");
replacements = test_string.replace("!", " :^)");
EXPECT(replacements == 1);
EXPECT(test_string == "We're, he'reo Testers :^)");
test_string = String("111._.111._.111");
replacements = test_string.replace("111", "|||", true);
EXPECT(replacements == 3);
EXPECT(test_string == "|||._.|||._.|||");
replacements = test_string.replace("|||", "111");
EXPECT(replacements == 1);
EXPECT(test_string == "111._.|||._.|||");
}
TEST_MAIN(String)