ladybird/AK/String.cpp
2021-05-25 00:24:09 +04:30

508 lines
12 KiB
C++

/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/ByteBuffer.h>
#include <AK/FlyString.h>
#include <AK/Format.h>
#include <AK/Memory.h>
#include <AK/StdLibExtras.h>
#include <AK/String.h>
#include <AK/StringView.h>
#include <AK/Vector.h>
namespace AK {
String::String(const StringView& view)
{
m_impl = StringImpl::create(view.characters_without_null_termination(), view.length());
}
bool String::operator==(const FlyString& fly_string) const
{
return *this == String(fly_string.impl());
}
bool String::operator==(const String& other) const
{
if (!m_impl)
return !other.m_impl;
if (!other.m_impl)
return false;
return *m_impl == *other.m_impl;
}
bool String::operator==(const StringView& other) const
{
if (!m_impl)
return !other.m_characters;
if (!other.m_characters)
return false;
if (length() != other.length())
return false;
return !memcmp(characters(), other.characters_without_null_termination(), length());
}
bool String::operator<(const String& other) const
{
if (!m_impl)
return other.m_impl;
if (!other.m_impl)
return false;
return strcmp(characters(), other.characters()) < 0;
}
bool String::operator>(const String& other) const
{
if (!m_impl)
return other.m_impl;
if (!other.m_impl)
return false;
return strcmp(characters(), other.characters()) > 0;
}
String String::empty()
{
return StringImpl::the_empty_stringimpl();
}
bool String::copy_characters_to_buffer(char* buffer, size_t buffer_size) const
{
// We must fit at least the NUL-terminator.
VERIFY(buffer_size > 0);
size_t characters_to_copy = min(length(), buffer_size - 1);
__builtin_memcpy(buffer, characters(), characters_to_copy);
buffer[characters_to_copy] = 0;
return characters_to_copy == length();
}
String String::isolated_copy() const
{
if (!m_impl)
return {};
if (!m_impl->length())
return empty();
char* buffer;
auto impl = StringImpl::create_uninitialized(length(), buffer);
memcpy(buffer, m_impl->characters(), m_impl->length());
return String(move(*impl));
}
String String::substring(size_t start) const
{
VERIFY(m_impl);
VERIFY(start <= length());
return { characters() + start, length() - start };
}
String String::substring(size_t start, size_t length) const
{
if (!length)
return "";
VERIFY(m_impl);
VERIFY(start + length <= m_impl->length());
// FIXME: This needs some input bounds checking.
return { characters() + start, length };
}
StringView String::substring_view(size_t start, size_t length) const
{
VERIFY(m_impl);
VERIFY(start + length <= m_impl->length());
// FIXME: This needs some input bounds checking.
return { characters() + start, length };
}
StringView String::substring_view(size_t start) const
{
VERIFY(m_impl);
VERIFY(start <= length());
return { characters() + start, length() - start };
}
Vector<String> String::split(char separator, bool keep_empty) const
{
return split_limit(separator, 0, keep_empty);
}
Vector<String> String::split_limit(char separator, size_t limit, bool keep_empty) const
{
if (is_empty())
return {};
Vector<String> v;
size_t substart = 0;
for (size_t i = 0; i < length() && (v.size() + 1) != limit; ++i) {
char ch = characters()[i];
if (ch == separator) {
size_t sublen = i - substart;
if (sublen != 0 || keep_empty)
v.append(substring(substart, sublen));
substart = i + 1;
}
}
size_t taillen = length() - substart;
if (taillen != 0 || keep_empty)
v.append(substring(substart, taillen));
return v;
}
Vector<StringView> String::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()[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;
}
ByteBuffer String::to_byte_buffer() const
{
if (!m_impl)
return {};
return ByteBuffer::copy(reinterpret_cast<const u8*>(characters()), length());
}
template<typename T>
Optional<T> String::to_int() const
{
return StringUtils::convert_to_int<T>(view());
}
template Optional<i8> String::to_int() const;
template Optional<i16> String::to_int() const;
template Optional<i32> String::to_int() const;
template Optional<i64> String::to_int() const;
template<typename T>
Optional<T> String::to_uint() const
{
return StringUtils::convert_to_uint<T>(view());
}
template Optional<u8> String::to_uint() const;
template Optional<u16> String::to_uint() const;
template Optional<u32> String::to_uint() const;
template Optional<u64> String::to_uint() const;
bool String::starts_with(const StringView& str, CaseSensitivity case_sensitivity) const
{
return StringUtils::starts_with(*this, str, case_sensitivity);
}
bool String::starts_with(char ch) const
{
if (is_empty())
return false;
return characters()[0] == ch;
}
bool String::ends_with(const StringView& str, CaseSensitivity case_sensitivity) const
{
return StringUtils::ends_with(*this, str, case_sensitivity);
}
bool String::ends_with(char ch) const
{
if (is_empty())
return false;
return characters()[length() - 1] == ch;
}
String String::repeated(char ch, size_t count)
{
if (!count)
return empty();
char* buffer;
auto impl = StringImpl::create_uninitialized(count, buffer);
memset(buffer, ch, count);
return *impl;
}
String String::repeated(const StringView& string, size_t count)
{
if (!count || string.is_empty())
return empty();
char* buffer;
auto impl = StringImpl::create_uninitialized(count * string.length(), buffer);
for (size_t i = 0; i < count; i++)
__builtin_memcpy(buffer + i * string.length(), string.characters_without_null_termination(), string.length());
return *impl;
}
String String::bijective_base_from(size_t value, unsigned base, StringView map)
{
if (map.is_null())
map = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"sv;
VERIFY(base >= 2 && base <= map.length());
// The '8 bits per byte' assumption may need to go?
Array<char, round_up_to_power_of_two(sizeof(size_t) * 8 + 1, 2)> buffer;
size_t i = 0;
do {
buffer[i++] = map[value % base];
value /= base;
} while (value > 0);
// NOTE: Weird as this may seem, the thing that comes after 'Z' is 'AA', which as a number would be '00'
// to make this work, only the most significant digit has to be in a range of (1..25) as opposed to (0..25),
// but only if it's not the only digit in the string.
if (i > 1)
--buffer[i - 1];
for (size_t j = 0; j < i / 2; ++j)
swap(buffer[j], buffer[i - j - 1]);
return String { ReadonlyBytes(buffer.data(), i) };
}
bool String::matches(const StringView& mask, Vector<MaskSpan>& mask_spans, CaseSensitivity case_sensitivity) const
{
return StringUtils::matches(*this, mask, case_sensitivity, &mask_spans);
}
bool String::matches(const StringView& mask, CaseSensitivity case_sensitivity) const
{
return StringUtils::matches(*this, mask, case_sensitivity);
}
bool String::contains(const StringView& needle, CaseSensitivity case_sensitivity) const
{
return StringUtils::contains(*this, needle, case_sensitivity);
}
bool String::equals_ignoring_case(const StringView& other) const
{
return StringUtils::equals_ignoring_case(view(), other);
}
Vector<size_t> String::find_all(const String& needle) const
{
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);
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;
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();
}
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;
for (size_t i = length(); i-- > 0;) {
reversed_string.append(characters()[i]);
}
return reversed_string.to_string();
}
String escape_html_entities(const StringView& html)
{
StringBuilder builder;
for (size_t i = 0; i < html.length(); ++i) {
if (html[i] == '<')
builder.append("&lt;");
else if (html[i] == '>')
builder.append("&gt;");
else if (html[i] == '&')
builder.append("&amp;");
else
builder.append(html[i]);
}
return builder.to_string();
}
String::String(const FlyString& string)
: m_impl(string.impl())
{
}
String String::to_lowercase() const
{
if (!m_impl)
return {};
return m_impl->to_lowercase();
}
String String::to_uppercase() const
{
if (!m_impl)
return {};
return m_impl->to_uppercase();
}
String String::to_snakecase() const
{
return StringUtils::to_snakecase(*this);
}
bool operator<(const char* characters, const String& string)
{
if (!characters)
return !string.is_null();
if (string.is_null())
return false;
return __builtin_strcmp(characters, string.characters()) < 0;
}
bool operator>=(const char* characters, const String& string)
{
return !(characters < string);
}
bool operator>(const char* characters, const String& string)
{
if (!characters)
return !string.is_null();
if (string.is_null())
return false;
return __builtin_strcmp(characters, string.characters()) > 0;
}
bool operator<=(const char* characters, const String& string)
{
return !(characters > string);
}
bool String::operator==(const char* cstring) const
{
if (is_null())
return !cstring;
if (!cstring)
return false;
return !__builtin_strcmp(characters(), cstring);
}
StringView String::view() const
{
return { characters(), length() };
}
InputStream& operator>>(InputStream& stream, String& string)
{
StringBuilder builder;
for (;;) {
char next_char;
stream >> next_char;
if (stream.has_any_error()) {
stream.set_fatal_error();
string = nullptr;
return stream;
}
if (next_char) {
builder.append(next_char);
} else {
string = builder.to_string();
return stream;
}
}
}
String String::vformatted(StringView fmtstr, TypeErasedFormatParams params)
{
StringBuilder builder;
vformat(builder, fmtstr, params);
return builder.to_string();
}
Optional<size_t> String::find(char c, size_t start) const
{
return find(StringView { &c, 1 }, start);
}
Optional<size_t> String::find(StringView const& view, size_t start) const
{
auto index = StringUtils::find(substring_view(start), view);
if (!index.has_value())
return {};
return index.value() + start;
}
}