ladybird/AK/String.h

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/*
* 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/Stream.h>
#include <AK/StringBuilder.h>
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#include <AK/StringImpl.h>
#include <AK/StringUtils.h>
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#include <AK/Traits.h>
namespace AK {
// String 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>, 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 String 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 String:
//
// s = String("some literal");
//
// s = String::formatted("{} little piggies", m_piggies);
//
// StringBuilder builder;
// builder.append("abc");
// builder.append("123");
// s = builder.to_string();
class String {
public:
~String() = default;
String() = default;
String(const StringView& view)
{
m_impl = StringImpl::create(view.characters_without_null_termination(), view.length());
}
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String(const String& other)
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: m_impl(const_cast<String&>(other).m_impl)
{
}
String(String&& other)
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: m_impl(move(other.m_impl))
{
}
String(const char* cstring, ShouldChomp shouldChomp = NoChomp)
: m_impl(StringImpl::create(cstring, shouldChomp))
{
}
String(const char* cstring, size_t length, ShouldChomp shouldChomp = NoChomp)
: m_impl(StringImpl::create(cstring, length, shouldChomp))
{
}
explicit String(ReadonlyBytes bytes, ShouldChomp shouldChomp = NoChomp)
: m_impl(StringImpl::create(bytes, shouldChomp))
{
}
String(const StringImpl& impl)
: m_impl(const_cast<StringImpl&>(impl))
{
}
String(const StringImpl* impl)
: m_impl(const_cast<StringImpl*>(impl))
{
}
String(RefPtr<StringImpl>&& impl)
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: m_impl(move(impl))
{
}
String(NonnullRefPtr<StringImpl>&& impl)
: m_impl(move(impl))
{
}
String(const FlyString&);
[[nodiscard]] static String repeated(char, size_t count);
[[nodiscard]] static String repeated(const StringView&, size_t count);
[[nodiscard]] static String bijective_base_from(size_t value, unsigned base = 26, StringView map = {});
template<class SeparatorType, class CollectionType>
[[nodiscard]] static String join(const SeparatorType& separator, const CollectionType& collection)
{
StringBuilder builder;
builder.join(separator, collection);
return builder.build();
}
[[nodiscard]] bool matches(const StringView& mask, CaseSensitivity = CaseSensitivity::CaseInsensitive) const;
[[nodiscard]] bool matches(const StringView& mask, Vector<MaskSpan>&, CaseSensitivity = CaseSensitivity::CaseInsensitive) const;
template<typename T = int>
[[nodiscard]] Optional<T> to_int(TrimWhitespace = TrimWhitespace::Yes) const;
template<typename T = unsigned>
[[nodiscard]] Optional<T> to_uint(TrimWhitespace = TrimWhitespace::Yes) const;
[[nodiscard]] String to_lowercase() const;
[[nodiscard]] String to_uppercase() const;
[[nodiscard]] String to_snakecase() const;
[[nodiscard]] bool is_whitespace() const { return StringUtils::is_whitespace(*this); }
#ifndef KERNEL
[[nodiscard]] String trim(const StringView& characters, TrimMode mode = TrimMode::Both) const
{
return StringUtils::trim(view(), characters, mode);
}
[[nodiscard]] String trim_whitespace(TrimMode mode = TrimMode::Both) const
{
return StringUtils::trim_whitespace(view(), mode);
}
#endif
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[[nodiscard]] bool equals_ignoring_case(const StringView&) const;
[[nodiscard]] bool contains(const StringView&, CaseSensitivity = CaseSensitivity::CaseSensitive) const;
[[nodiscard]] Vector<String> split_limit(char separator, size_t limit, bool keep_empty = false) const;
[[nodiscard]] Vector<String> split(char separator, bool keep_empty = false) const;
[[nodiscard]] Vector<StringView> split_view(char separator, bool keep_empty = false) 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 const& 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); }
// FIXME: Implement find_last(StringView const&) for API symmetry.
[[nodiscard]] Vector<size_t> find_all(StringView const& needle) const { return StringUtils::find_all(*this, needle); }
using SearchDirection = StringUtils::SearchDirection;
[[nodiscard]] Optional<size_t> find_any_of(StringView const& needles, SearchDirection direction) const { return StringUtils::find_any_of(*this, needles, direction); }
[[nodiscard]] String substring(size_t start, size_t length) const;
[[nodiscard]] String 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]] bool is_null() const { return !m_impl; }
[[nodiscard]] ALWAYS_INLINE bool is_empty() const { return length() == 0; }
[[nodiscard]] ALWAYS_INLINE size_t length() const { return m_impl ? m_impl->length() : 0; }
// Includes NUL-terminator, if non-nullptr.
[[nodiscard]] ALWAYS_INLINE const char* characters() const { return m_impl ? m_impl->characters() : nullptr; }
[[nodiscard]] bool copy_characters_to_buffer(char* buffer, size_t buffer_size) const;
[[nodiscard]] ALWAYS_INLINE ReadonlyBytes bytes() const
{
if (m_impl) {
return m_impl->bytes();
}
return {};
}
[[nodiscard]] ALWAYS_INLINE const char& operator[](size_t i) const
{
VERIFY(!is_null());
return (*m_impl)[i];
}
using ConstIterator = SimpleIterator<const String, const char>;
[[nodiscard]] constexpr ConstIterator begin() const { return ConstIterator::begin(*this); }
[[nodiscard]] constexpr ConstIterator end() const { return ConstIterator::end(*this); }
[[nodiscard]] bool starts_with(const StringView&, CaseSensitivity = CaseSensitivity::CaseSensitive) const;
[[nodiscard]] bool ends_with(const StringView&, CaseSensitivity = CaseSensitivity::CaseSensitive) const;
[[nodiscard]] bool starts_with(char) const;
[[nodiscard]] bool ends_with(char) const;
bool operator==(const String&) const;
bool operator!=(const String& other) const { return !(*this == other); }
bool operator==(const StringView&) const;
bool operator!=(const StringView& other) const { return !(*this == other); }
bool operator==(const FlyString&) const;
bool operator!=(const FlyString& other) const { return !(*this == other); }
bool operator<(const String&) const;
bool operator<(const char*) const;
bool operator>=(const String& other) const { return !(*this < other); }
bool operator>=(const char* other) const { return !(*this < other); }
bool operator>(const String&) const;
bool operator>(const char*) const;
bool operator<=(const String& other) const { return !(*this > other); }
bool operator<=(const char* other) const { return !(*this > other); }
bool operator==(const char* cstring) const;
bool operator!=(const char* cstring) const { return !(*this == cstring); }
[[nodiscard]] String isolated_copy() const;
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[[nodiscard]] static String empty()
{
return StringImpl::the_empty_stringimpl();
}
[[nodiscard]] StringImpl* impl() { return m_impl.ptr(); }
[[nodiscard]] const StringImpl* impl() const { return m_impl.ptr(); }
String& operator=(String&& other)
{
if (this != &other)
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m_impl = move(other.m_impl);
return *this;
}
String& operator=(const String& other)
{
if (this != &other)
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m_impl = const_cast<String&>(other).m_impl;
return *this;
}
String& operator=(std::nullptr_t)
{
m_impl = nullptr;
return *this;
}
String& operator=(ReadonlyBytes bytes)
{
m_impl = StringImpl::create(bytes);
return *this;
}
[[nodiscard]] u32 hash() const
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{
if (!m_impl)
return 0;
return m_impl->hash();
}
[[nodiscard]] ByteBuffer to_byte_buffer() const;
template<typename BufferType>
[[nodiscard]] static String copy(const BufferType& buffer, ShouldChomp should_chomp = NoChomp)
{
if (buffer.is_empty())
return empty();
return String((const char*)buffer.data(), buffer.size(), should_chomp);
}
[[nodiscard]] static String vformatted(StringView fmtstr, TypeErasedFormatParams);
template<typename... Parameters>
[[nodiscard]] static String formatted(CheckedFormatString<Parameters...>&& fmtstr, const Parameters&... parameters)
{
return vformatted(fmtstr.view(), VariadicFormatParams { parameters... });
}
template<typename T>
[[nodiscard]] static String number(T value) requires IsArithmetic<T>
{
return formatted("{}", value);
}
[[nodiscard]] StringView view() const
{
return { characters(), length() };
}
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int replace(const String& needle, const String& replacement, bool all_occurrences = false);
size_t count(const String& needle) const;
[[nodiscard]] String reverse() const;
template<typename... Ts>
[[nodiscard]] ALWAYS_INLINE constexpr bool is_one_of(Ts... strings) const
{
return (... || this->operator==(forward<Ts>(strings)));
}
private:
RefPtr<StringImpl> m_impl;
};
template<>
struct Traits<String> : public GenericTraits<String> {
static unsigned hash(const String& s) { return s.impl() ? s.impl()->hash() : 0; }
};
struct CaseInsensitiveStringTraits : public Traits<String> {
static unsigned hash(const String& s) { return s.impl() ? s.to_lowercase().impl()->hash() : 0; }
static bool equals(const String& a, const String& b) { return a.to_lowercase() == b.to_lowercase(); }
};
bool operator<(const char*, const String&);
bool operator>=(const char*, const String&);
bool operator>(const char*, const String&);
bool operator<=(const char*, const String&);
String escape_html_entities(const StringView& html);
InputStream& operator>>(InputStream& stream, String& string);
}
using AK::CaseInsensitiveStringTraits;
using AK::escape_html_entities;
using AK::String;