ladybird/AK/ByteString.h

345 lines
12 KiB
C++

/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Format.h>
#include <AK/Forward.h>
#include <AK/RefPtr.h>
#include <AK/StringBuilder.h>
#include <AK/StringImpl.h>
#include <AK/StringUtils.h>
#include <AK/Traits.h>
namespace AK {
// ByteString is a convenience wrapper around StringImpl, suitable for passing
// around as a value type. It's basically the same as passing around a
// RefPtr<StringImpl const>, with a bit of syntactic sugar.
//
// Note that StringImpl is an immutable object that cannot shrink or grow.
// Its allocation size is snugly tailored to the specific string it contains.
// Copying a ByteString is very efficient, since the internal StringImpl is
// retainable and so copying only requires modifying the ref count.
//
// There are three main ways to construct a new ByteString:
//
// s = ByteString("some literal");
//
// s = ByteString::formatted("{} little piggies", m_piggies);
//
// StringBuilder builder;
// builder.append("abc");
// builder.append("123");
// s = builder.to_byte_string();
class ByteString {
public:
~ByteString() = default;
ByteString()
: m_impl(StringImpl::the_empty_stringimpl())
{
}
ByteString(StringView view)
: m_impl(*StringImpl::create(view.characters_without_null_termination(), view.length()))
{
}
ByteString(ByteString const& other)
: m_impl(other.m_impl)
{
}
ByteString(ByteString&& other)
: m_impl(move(other.m_impl))
{
other.m_impl = StringImpl::the_empty_stringimpl();
}
ByteString(char const* cstring, ShouldChomp shouldChomp = NoChomp)
: m_impl(*StringImpl::create(cstring, shouldChomp))
{
}
ByteString(char const* cstring, size_t length, ShouldChomp shouldChomp = NoChomp)
: m_impl(*StringImpl::create(cstring, length, shouldChomp))
{
}
explicit ByteString(ReadonlyBytes bytes, ShouldChomp shouldChomp = NoChomp)
: m_impl(*StringImpl::create(bytes, shouldChomp))
{
}
ByteString(StringImpl const& impl)
: m_impl(impl)
{
}
ByteString(NonnullRefPtr<StringImpl const>&& impl)
: m_impl(*move(impl))
{
}
ByteString(DeprecatedFlyString const&);
static ErrorOr<ByteString> from_utf8(ReadonlyBytes);
static ErrorOr<ByteString> from_utf8(StringView string) { return from_utf8(string.bytes()); }
static ByteString must_from_utf8(StringView string) { return MUST(from_utf8(string)); }
static ByteString from_utf8_without_validation(StringView string) { return ByteString { string }; }
template<
typename F,
typename PossiblyErrorOr = decltype(declval<F>()(declval<Bytes>())),
bool is_error_or = IsSpecializationOf<PossiblyErrorOr, ErrorOr>,
typename ReturnType = Conditional<is_error_or, ErrorOr<ByteString>, ByteString>>
static ReturnType create_and_overwrite(size_t length, F&& fill_function)
{
char* buffer;
auto impl = StringImpl::create_uninitialized(length, buffer);
if constexpr (is_error_or)
TRY(fill_function(Bytes { buffer, length }));
else
fill_function(Bytes { buffer, length });
return impl;
}
[[nodiscard]] static ByteString repeated(char, size_t count);
[[nodiscard]] static ByteString repeated(StringView, size_t count);
[[nodiscard]] static ByteString bijective_base_from(size_t value, unsigned base = 26, StringView map = {});
[[nodiscard]] static ByteString roman_number_from(size_t value);
template<class SeparatorType, class CollectionType>
[[nodiscard]] static ByteString join(SeparatorType const& separator, CollectionType const& collection, StringView fmtstr = "{}"sv)
{
StringBuilder builder;
builder.join(separator, collection, fmtstr);
return builder.to_byte_string();
}
[[nodiscard]] bool matches(StringView mask, CaseSensitivity = CaseSensitivity::CaseInsensitive) const;
[[nodiscard]] bool matches(StringView mask, Vector<MaskSpan>&, CaseSensitivity = CaseSensitivity::CaseInsensitive) const;
template<Arithmetic T>
Optional<T> to_number(TrimWhitespace trim_whitespace = TrimWhitespace::Yes) const
{
return view().to_number<T>(trim_whitespace);
}
[[nodiscard]] ByteString to_lowercase() const;
[[nodiscard]] ByteString to_uppercase() const;
[[nodiscard]] ByteString to_snakecase() const;
[[nodiscard]] ByteString to_titlecase() const;
[[nodiscard]] ByteString invert_case() const;
[[nodiscard]] bool is_whitespace() const { return StringUtils::is_whitespace(*this); }
[[nodiscard]] DeprecatedStringCodePointIterator code_points() const;
[[nodiscard]] ByteString trim(StringView characters, TrimMode mode = TrimMode::Both) const
{
auto trimmed_view = StringUtils::trim(view(), characters, mode);
if (view() == trimmed_view)
return *this;
return trimmed_view;
}
[[nodiscard]] ByteString trim_whitespace(TrimMode mode = TrimMode::Both) const
{
auto trimmed_view = StringUtils::trim_whitespace(view(), mode);
if (view() == trimmed_view)
return *this;
return trimmed_view;
}
[[nodiscard]] bool equals_ignoring_ascii_case(StringView) const;
[[nodiscard]] bool contains(StringView, CaseSensitivity = CaseSensitivity::CaseSensitive) const;
[[nodiscard]] bool contains(char, CaseSensitivity = CaseSensitivity::CaseSensitive) const;
[[nodiscard]] Vector<ByteString> split_limit(char separator, size_t limit, SplitBehavior = SplitBehavior::Nothing) const;
[[nodiscard]] Vector<ByteString> split(char separator, SplitBehavior = SplitBehavior::Nothing) const;
[[nodiscard]] Vector<StringView> split_view(char separator, SplitBehavior = SplitBehavior::Nothing) const;
[[nodiscard]] Vector<StringView> split_view(Function<bool(char)> separator, SplitBehavior = SplitBehavior::Nothing) const;
[[nodiscard]] Optional<size_t> find(char needle, size_t start = 0) const { return StringUtils::find(*this, needle, start); }
[[nodiscard]] Optional<size_t> find(StringView needle, size_t start = 0) const { return StringUtils::find(*this, needle, start); }
[[nodiscard]] Optional<size_t> find_last(char needle) const { return StringUtils::find_last(*this, needle); }
[[nodiscard]] Optional<size_t> find_last(StringView needle) const { return StringUtils::find_last(*this, needle); }
Vector<size_t> find_all(StringView needle) const;
using SearchDirection = StringUtils::SearchDirection;
[[nodiscard]] Optional<size_t> find_any_of(StringView needles, SearchDirection direction) const { return StringUtils::find_any_of(*this, needles, direction); }
[[nodiscard]] StringView find_last_split_view(char separator) const { return view().find_last_split_view(separator); }
[[nodiscard]] ByteString substring(size_t start, size_t length) const;
[[nodiscard]] ByteString substring(size_t start) const;
[[nodiscard]] StringView substring_view(size_t start, size_t length) const;
[[nodiscard]] StringView substring_view(size_t start) const;
[[nodiscard]] ALWAYS_INLINE bool is_empty() const { return length() == 0; }
[[nodiscard]] ALWAYS_INLINE size_t length() const { return m_impl->length(); }
// Includes NUL-terminator.
[[nodiscard]] ALWAYS_INLINE char const* characters() const { return m_impl->characters(); }
[[nodiscard]] bool copy_characters_to_buffer(char* buffer, size_t buffer_size) const;
[[nodiscard]] ALWAYS_INLINE ReadonlyBytes bytes() const
{
return m_impl->bytes();
}
[[nodiscard]] ALWAYS_INLINE char const& operator[](size_t i) const
{
return (*m_impl)[i];
}
[[nodiscard]] ALWAYS_INLINE u8 byte_at(size_t i) const
{
return bit_cast<u8>((*m_impl)[i]);
}
using ConstIterator = SimpleIterator<ByteString const, char const>;
[[nodiscard]] constexpr ConstIterator begin() const { return ConstIterator::begin(*this); }
[[nodiscard]] constexpr ConstIterator end() const { return ConstIterator::end(*this); }
[[nodiscard]] bool starts_with(StringView, CaseSensitivity = CaseSensitivity::CaseSensitive) const;
[[nodiscard]] bool ends_with(StringView, CaseSensitivity = CaseSensitivity::CaseSensitive) const;
[[nodiscard]] bool starts_with(char) const;
[[nodiscard]] bool ends_with(char) const;
bool operator==(ByteString const&) const;
bool operator==(StringView) const;
bool operator==(DeprecatedFlyString const&) const;
bool operator<(ByteString const&) const;
bool operator>=(ByteString const& other) const { return !(*this < other); }
bool operator>=(char const* other) const { return !(*this < other); }
bool operator>(ByteString const&) const;
bool operator<=(ByteString const& other) const { return !(*this > other); }
bool operator<=(char const* other) const { return !(*this > other); }
bool operator==(char const* cstring) const;
[[nodiscard]] ByteString isolated_copy() const;
[[nodiscard]] static ByteString empty()
{
return StringImpl::the_empty_stringimpl();
}
[[nodiscard]] NonnullRefPtr<StringImpl const> impl() const { return m_impl; }
ByteString& operator=(ByteString&& other)
{
if (this != &other)
m_impl = move(other.m_impl);
return *this;
}
ByteString& operator=(ByteString const& other)
{
if (this != &other)
m_impl = const_cast<ByteString&>(other).m_impl;
return *this;
}
template<OneOf<ReadonlyBytes, Bytes> T>
ByteString& operator=(T bytes)
{
m_impl = *StringImpl::create(bytes);
return *this;
}
[[nodiscard]] u32 hash() const
{
return m_impl->hash();
}
[[nodiscard]] ByteBuffer to_byte_buffer() const;
template<typename BufferType>
[[nodiscard]] static ByteString copy(BufferType const& buffer, ShouldChomp should_chomp = NoChomp)
{
if (buffer.is_empty())
return empty();
return ByteString(reinterpret_cast<char const*>(buffer.data()), buffer.size(), should_chomp);
}
[[nodiscard]] static ByteString vformatted(StringView fmtstr, TypeErasedFormatParams&);
template<typename... Parameters>
[[nodiscard]] static ByteString formatted(CheckedFormatString<Parameters...>&& fmtstr, Parameters const&... parameters)
{
VariadicFormatParams<AllowDebugOnlyFormatters::No, Parameters...> variadic_format_parameters { parameters... };
return vformatted(fmtstr.view(), variadic_format_parameters);
}
template<Arithmetic T>
[[nodiscard]] static ByteString number(T value)
{
return formatted("{}", value);
}
[[nodiscard]] StringView view() const
{
return { characters(), length() };
}
[[nodiscard]] ByteString replace(StringView needle, StringView replacement, ReplaceMode replace_mode = ReplaceMode::All) const { return StringUtils::replace(*this, needle, replacement, replace_mode); }
[[nodiscard]] size_t count(StringView needle) const { return StringUtils::count(*this, needle); }
[[nodiscard]] ByteString reverse() const;
template<typename... Ts>
[[nodiscard]] ALWAYS_INLINE constexpr bool is_one_of(Ts&&... strings) const
{
return (... || this->operator==(forward<Ts>(strings)));
}
template<typename... Ts>
[[nodiscard]] ALWAYS_INLINE constexpr bool is_one_of_ignoring_ascii_case(Ts&&... strings) const
{
return (... ||
[this, &strings]() -> bool {
if constexpr (requires(Ts a) { a.view()->StringView; })
return this->equals_ignoring_ascii_case(forward<Ts>(strings.view()));
else
return this->equals_ignoring_ascii_case(forward<Ts>(strings));
}());
}
private:
NonnullRefPtr<StringImpl const> m_impl;
};
template<>
struct Traits<ByteString> : public DefaultTraits<ByteString> {
static unsigned hash(ByteString const& s) { return s.impl()->hash(); }
};
// FIXME: Rename this to indicate that it's about ASCII-only case insensitivity.
struct CaseInsensitiveStringTraits : public Traits<ByteString> {
static unsigned hash(ByteString const& s) { return s.impl()->case_insensitive_hash(); }
static bool equals(ByteString const& a, ByteString const& b) { return a.equals_ignoring_ascii_case(b); }
};
ByteString escape_html_entities(StringView html);
}
#if USING_AK_GLOBALLY
using AK::CaseInsensitiveStringTraits;
using AK::escape_html_entities;
#endif