ladybird/AK/String.cpp

453 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/Function.h>
#include <AK/Memory.h>
#include <AK/StdLibExtras.h>
#include <AK/String.h>
#include <AK/StringView.h>
#include <AK/Vector.h>
namespace AK {
bool String::operator==(FlyString const& fly_string) const
{
return m_impl == fly_string.impl() || view() == fly_string.view();
}
bool String::operator==(String const& other) const
{
return m_impl == other.impl() || view() == other.view();
}
bool String::operator==(StringView other) const
{
return view() == other;
}
bool String::operator<(String const& other) const
{
return view() < other.view();
}
bool String::operator>(String const& other) const
{
return view() > other.view();
}
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, size_t length) const
{
if (!length)
return String::empty();
VERIFY(m_impl);
VERIFY(!Checked<size_t>::addition_would_overflow(start, length));
VERIFY(start + length <= m_impl->length());
return { characters() + start, length };
}
String String::substring(size_t start) const
{
VERIFY(m_impl);
VERIFY(start <= length());
return { characters() + start, length() - start };
}
StringView String::substring_view(size_t start, size_t length) const
{
VERIFY(m_impl);
VERIFY(!Checked<size_t>::addition_would_overflow(start, length));
VERIFY(start + length <= m_impl->length());
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, SplitBehavior split_behavior) const
{
return split_limit(separator, 0, split_behavior);
}
Vector<String> String::split_limit(char separator, size_t limit, SplitBehavior split_behavior) const
{
if (is_empty())
return {};
Vector<String> v;
size_t substart = 0;
bool keep_empty = has_flag(split_behavior, SplitBehavior::KeepEmpty);
bool keep_separator = has_flag(split_behavior, SplitBehavior::KeepTrailingSeparator);
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, keep_separator ? sublen + 1 : 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(Function<bool(char)> separator, SplitBehavior split_behavior) const
{
if (is_empty())
return {};
Vector<StringView> v;
size_t substart = 0;
bool keep_empty = has_flag(split_behavior, SplitBehavior::KeepEmpty);
bool keep_separator = has_flag(split_behavior, SplitBehavior::KeepTrailingSeparator);
for (size_t i = 0; i < length(); ++i) {
char ch = characters()[i];
if (separator(ch)) {
size_t sublen = i - substart;
if (sublen != 0 || keep_empty)
v.append(substring_view(substart, keep_separator ? sublen + 1 : sublen));
substart = i + 1;
}
}
size_t taillen = length() - substart;
if (taillen != 0 || keep_empty)
v.append(substring_view(substart, taillen));
return v;
}
Vector<StringView> String::split_view(char const separator, SplitBehavior split_behavior) const
{
return split_view([separator](char ch) { return ch == separator; }, split_behavior);
}
ByteBuffer String::to_byte_buffer() const
{
if (!m_impl)
return {};
// FIXME: Handle OOM failure.
return ByteBuffer::copy(bytes()).release_value_but_fixme_should_propagate_errors();
}
template<typename T>
Optional<T> String::to_int(TrimWhitespace trim_whitespace) const
{
return StringUtils::convert_to_int<T>(view(), trim_whitespace);
}
template Optional<i8> String::to_int(TrimWhitespace) const;
template Optional<i16> String::to_int(TrimWhitespace) const;
template Optional<i32> String::to_int(TrimWhitespace) const;
template Optional<i64> String::to_int(TrimWhitespace) const;
template<typename T>
Optional<T> String::to_uint(TrimWhitespace trim_whitespace) const
{
return StringUtils::convert_to_uint<T>(view(), trim_whitespace);
}
template Optional<u8> String::to_uint(TrimWhitespace) const;
template Optional<u16> String::to_uint(TrimWhitespace) const;
template Optional<u32> String::to_uint(TrimWhitespace) const;
template Optional<unsigned long> String::to_uint(TrimWhitespace) const;
template Optional<unsigned long long> String::to_uint(TrimWhitespace) const;
#ifndef KERNEL
Optional<double> String::to_double(TrimWhitespace trim_whitespace) const
{
return StringUtils::convert_to_floating_point<double>(*this, trim_whitespace);
}
Optional<float> String::to_float(TrimWhitespace trim_whitespace) const
{
return StringUtils::convert_to_floating_point<float>(*this, trim_whitespace);
}
#endif
bool String::starts_with(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(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(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) };
}
String String::roman_number_from(size_t value)
{
if (value > 3999)
return String::number(value);
StringBuilder builder;
while (value > 0) {
if (value >= 1000) {
builder.append('M');
value -= 1000;
} else if (value >= 900) {
builder.append("CM"sv);
value -= 900;
} else if (value >= 500) {
builder.append('D');
value -= 500;
} else if (value >= 400) {
builder.append("CD"sv);
value -= 400;
} else if (value >= 100) {
builder.append('C');
value -= 100;
} else if (value >= 90) {
builder.append("XC"sv);
value -= 90;
} else if (value >= 50) {
builder.append('L');
value -= 50;
} else if (value >= 40) {
builder.append("XL"sv);
value -= 40;
} else if (value >= 10) {
builder.append('X');
value -= 10;
} else if (value == 9) {
builder.append("IX"sv);
value -= 9;
} else if (value >= 5 && value <= 8) {
builder.append('V');
value -= 5;
} else if (value == 4) {
builder.append("IV"sv);
value -= 4;
} else if (value <= 3) {
builder.append('I');
value -= 1;
}
}
return builder.to_string();
}
bool String::matches(StringView mask, Vector<MaskSpan>& mask_spans, CaseSensitivity case_sensitivity) const
{
return StringUtils::matches(*this, mask, case_sensitivity, &mask_spans);
}
bool String::matches(StringView mask, CaseSensitivity case_sensitivity) const
{
return StringUtils::matches(*this, mask, case_sensitivity);
}
bool String::contains(StringView needle, CaseSensitivity case_sensitivity) const
{
return StringUtils::contains(*this, needle, case_sensitivity);
}
bool String::contains(char needle, CaseSensitivity case_sensitivity) const
{
return StringUtils::contains(*this, StringView(&needle, 1), case_sensitivity);
}
bool String::equals_ignoring_case(StringView other) const
{
return StringUtils::equals_ignoring_case(view(), other);
}
String String::reverse() const
{
StringBuilder reversed_string(length());
for (size_t i = length(); i-- > 0;) {
reversed_string.append(characters()[i]);
}
return reversed_string.to_string();
}
String escape_html_entities(StringView html)
{
StringBuilder builder;
for (size_t i = 0; i < html.length(); ++i) {
if (html[i] == '<')
builder.append("&lt;"sv);
else if (html[i] == '>')
builder.append("&gt;"sv);
else if (html[i] == '&')
builder.append("&amp;"sv);
else if (html[i] == '"')
builder.append("&quot;"sv);
else
builder.append(html[i]);
}
return builder.to_string();
}
String::String(FlyString const& 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);
}
String String::to_titlecase() const
{
return StringUtils::to_titlecase(*this);
}
String String::invert_case() const
{
return StringUtils::invert_case(*this);
}
bool String::operator==(char const* cstring) const
{
return view() == cstring;
}
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;
MUST(vformat(builder, fmtstr, params));
return builder.to_string();
}
Vector<size_t> String::find_all(StringView needle) const
{
return StringUtils::find_all(*this, needle);
}
}