ladybird/AK/StringView.cpp

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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/AnyOf.h>
#include <AK/ByteBuffer.h>
#include <AK/Find.h>
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#include <AK/FlyString.h>
#include <AK/Function.h>
#include <AK/Memory.h>
#include <AK/String.h>
#include <AK/StringView.h>
#include <AK/Vector.h>
namespace AK {
StringView::StringView(const String& string)
: m_characters(string.characters())
, m_length(string.length())
{
}
StringView::StringView(const FlyString& string)
: m_characters(string.characters())
, m_length(string.length())
{
}
StringView::StringView(const ByteBuffer& buffer)
: m_characters((const char*)buffer.data())
, m_length(buffer.size())
{
}
Vector<StringView> StringView::split_view(const char separator, bool keep_empty) const
{
if (is_empty())
return {};
Vector<StringView> v;
size_t substart = 0;
for (size_t i = 0; i < length(); ++i) {
char ch = characters_without_null_termination()[i];
if (ch == separator) {
size_t sublen = i - substart;
if (sublen != 0 || keep_empty)
v.append(substring_view(substart, sublen));
substart = i + 1;
}
}
size_t taillen = length() - substart;
if (taillen != 0 || keep_empty)
v.append(substring_view(substart, taillen));
return v;
}
Vector<StringView> StringView::split_view(StringView separator, bool keep_empty) const
{
VERIFY(!separator.is_empty());
if (is_empty())
return {};
StringView view { *this };
Vector<StringView> parts;
auto maybe_separator_index = find(separator);
while (maybe_separator_index.has_value()) {
auto separator_index = maybe_separator_index.value();
auto part_with_separator = view.substring_view(0, separator_index + separator.length());
if (keep_empty || separator_index > 0)
parts.append(part_with_separator.substring_view(0, separator_index));
view = view.substring_view_starting_after_substring(part_with_separator);
maybe_separator_index = view.find(separator);
}
if (keep_empty || !view.is_empty())
parts.append(view);
return parts;
}
Vector<StringView> StringView::lines(bool consider_cr) const
{
if (is_empty())
return {};
if (!consider_cr)
return split_view('\n', true);
Vector<StringView> v;
size_t substart = 0;
bool last_ch_was_cr = false;
bool split_view = false;
for (size_t i = 0; i < length(); ++i) {
char ch = characters_without_null_termination()[i];
if (ch == '\n') {
split_view = true;
if (last_ch_was_cr) {
substart = i + 1;
split_view = false;
}
}
if (ch == '\r') {
split_view = true;
last_ch_was_cr = true;
} else {
last_ch_was_cr = false;
}
if (split_view) {
size_t sublen = i - substart;
v.append(substring_view(substart, sublen));
substart = i + 1;
}
split_view = false;
}
size_t taillen = length() - substart;
if (taillen != 0)
v.append(substring_view(substart, taillen));
return v;
}
bool StringView::starts_with(char ch) const
{
if (is_empty())
return false;
return ch == characters_without_null_termination()[0];
}
bool StringView::starts_with(StringView str, CaseSensitivity case_sensitivity) const
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{
return StringUtils::starts_with(*this, str, case_sensitivity);
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}
bool StringView::ends_with(char ch) const
{
if (is_empty())
return false;
return ch == characters_without_null_termination()[length() - 1];
}
bool StringView::ends_with(StringView str, CaseSensitivity case_sensitivity) const
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{
return StringUtils::ends_with(*this, str, case_sensitivity);
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}
bool StringView::matches(StringView mask, Vector<MaskSpan>& mask_spans, CaseSensitivity case_sensitivity) const
{
return StringUtils::matches(*this, mask, case_sensitivity, &mask_spans);
}
bool StringView::matches(StringView mask, CaseSensitivity case_sensitivity) const
{
return StringUtils::matches(*this, mask, case_sensitivity);
}
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bool StringView::contains(char needle) const
{
for (char current : *this) {
if (current == needle)
return true;
}
return false;
}
bool StringView::contains(StringView needle, CaseSensitivity case_sensitivity) const
{
return StringUtils::contains(*this, needle, case_sensitivity);
}
bool StringView::equals_ignoring_case(StringView other) const
{
return StringUtils::equals_ignoring_case(*this, other);
}
String StringView::to_lowercase_string() const
{
return StringImpl::create_lowercased(characters_without_null_termination(), length());
}
String StringView::to_uppercase_string() const
{
return StringImpl::create_uppercased(characters_without_null_termination(), length());
}
String StringView::to_titlecase_string() const
{
return StringUtils::to_titlecase(*this);
}
StringView StringView::substring_view_starting_from_substring(StringView substring) const
{
const char* remaining_characters = substring.characters_without_null_termination();
VERIFY(remaining_characters >= m_characters);
VERIFY(remaining_characters <= m_characters + m_length);
size_t remaining_length = m_length - (remaining_characters - m_characters);
return { remaining_characters, remaining_length };
}
StringView StringView::substring_view_starting_after_substring(StringView substring) const
{
const char* remaining_characters = substring.characters_without_null_termination() + substring.length();
VERIFY(remaining_characters >= m_characters);
VERIFY(remaining_characters <= m_characters + m_length);
size_t remaining_length = m_length - (remaining_characters - m_characters);
return { remaining_characters, remaining_length };
}
template<typename T>
Optional<T> StringView::to_int() const
{
return StringUtils::convert_to_int<T>(*this);
}
template Optional<i8> StringView::to_int() const;
template Optional<i16> StringView::to_int() const;
template Optional<i32> StringView::to_int() const;
template Optional<long> StringView::to_int() const;
template Optional<long long> StringView::to_int() const;
template<typename T>
Optional<T> StringView::to_uint() const
{
return StringUtils::convert_to_uint<T>(*this);
}
template Optional<u8> StringView::to_uint() const;
template Optional<u16> StringView::to_uint() const;
template Optional<u32> StringView::to_uint() const;
template Optional<unsigned long> StringView::to_uint() const;
template Optional<unsigned long long> StringView::to_uint() const;
template Optional<long> StringView::to_uint() const;
template Optional<long long> StringView::to_uint() const;
bool StringView::operator==(const String& string) const
{
if (string.is_null())
return !m_characters;
if (!m_characters)
return false;
if (m_length != string.length())
return false;
if (m_characters == string.characters())
return true;
return !__builtin_memcmp(m_characters, string.characters(), m_length);
}
String StringView::to_string() const { return String { *this }; }
String StringView::replace(StringView needle, StringView replacement, bool all_occurrences) const
{
return StringUtils::replace(*this, needle, replacement, all_occurrences);
}
Vector<size_t> StringView::find_all(StringView needle) const
{
return StringUtils::find_all(*this, needle);
}
Vector<StringView> StringView::split_view_if(Function<bool(char)> const& predicate, bool keep_empty) const
{
if (is_empty())
return {};
Vector<StringView> v;
size_t substart = 0;
for (size_t i = 0; i < length(); ++i) {
char ch = characters_without_null_termination()[i];
if (predicate(ch)) {
size_t sublen = i - substart;
if (sublen != 0 || keep_empty)
v.append(substring_view(substart, sublen));
substart = i + 1;
}
}
size_t taillen = length() - substart;
if (taillen != 0 || keep_empty)
v.append(substring_view(substart, taillen));
return v;
}
}