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AK: Add String::find_all() and String::count()

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This commit is contained in:
Maciej Zygmanowski 2021-05-19 13:29:23 +02:00 • committed by Linus Groh
parent e9898a6031
commit 80077cea86
3 changed files with 56 additions and 6 deletions
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40
AK/String.cpp
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@ -303,11 +303,8 @@ 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_occurrences)
Vector<size_t> String::find_all(const String& needle) const
{
if (is_empty())
return 0;
Vector<size_t> positions;
size_t start = 0, pos;
for (;;) {
@ -317,11 +314,26 @@ int String::replace(const String& needle, const String& replacement, bool all_oc
pos = ptr - characters();
positions.append(pos);
if (!all_occurrences)
break;
start = pos + 1;
}
return positions;
}
int String::replace(const String& needle, const String& replacement, bool all_occurrences)
{
if (is_empty())
return 0;
Vector<size_t> positions;
if (all_occurrences) {
positions = find_all(needle);
} else {
auto pos = find(needle);
if (!pos.has_value())
return 0;
positions.append(pos.value());
}
if (!positions.size())
return 0;
@ -338,6 +350,22 @@ int String::replace(const String& needle, const String& replacement, bool all_oc
return positions.size();
}
size_t String::count(const String& needle) const
{
size_t count = 0;
size_t start = 0, pos;
for (;;) {
const char* ptr = strstr(characters() + start, needle.characters());
if (!ptr)
break;
pos = ptr - characters();
count++;
start = pos + 1;
}
return count;
}
String String::reverse() const
{
StringBuilder reversed_string;