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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/Assertions.h>
#include <AK/Checked.h>
#include <AK/Forward.h>
#include <AK/StdLibExtras.h>
#include <AK/StringUtils.h>
namespace AK {
class StringView {
public:
using ConstIterator = const char*;
ALWAYS_INLINE constexpr StringView() { }
ALWAYS_INLINE constexpr StringView(const char* characters, size_t length)
: m_characters(characters)
, m_length(length)
{
ASSERT(!Checked<uintptr_t>::addition_would_overflow((uintptr_t)characters, length));
}
ALWAYS_INLINE StringView(const unsigned char* characters, size_t length)
: m_characters((const char*)characters)
, m_length(length)
{
ASSERT(!Checked<uintptr_t>::addition_would_overflow((uintptr_t)characters, length));
}
ALWAYS_INLINE constexpr StringView(const char* cstring)
: m_characters(cstring)
, m_length(cstring ? __builtin_strlen(cstring) : 0)
{
}
StringView(const ByteBuffer&);
StringView(const String&);
StringView(const FlyString&);
bool is_null() const { return !m_characters; }
bool is_empty() const { return m_length == 0; }
const char* characters_without_null_termination() const { return m_characters; }
size_t length() const { return m_length; }
const char& operator[](size_t index) const { return m_characters[index]; }
ConstIterator begin() const { return characters_without_null_termination(); }
ConstIterator end() const { return begin() + length(); }
unsigned hash() const;
bool starts_with(const StringView&) const;
bool ends_with(const StringView&, CaseSensitivity = CaseSensitivity::CaseSensitive) const;
bool starts_with(char) const;
bool ends_with(char) const;
bool matches(const StringView& mask, CaseSensitivity = CaseSensitivity::CaseInsensitive) const;
bool contains(char) const;
bool equals_ignoring_case(const StringView& other) const;
Optional<size_t> find_first_of(char) const;
Optional<size_t> find_first_of(const StringView&) const;
Optional<size_t> find_last_of(char) const;
Optional<size_t> find_last_of(const StringView&) const;
StringView substring_view(size_t start, size_t length) const;
Vector<StringView> split_view(char, bool keep_empty = false) const;
Vector<StringView> split_view(const StringView&, bool keep_empty = false) const;
// Create a Vector of StringViews split by line endings. As of CommonMark
// 0.29, the spec defines a line ending as "a newline (U+000A), a carriage
// return (U+000D) not followed by a newline, or a carriage return and a
// following newline.".
Vector<StringView> lines(bool consider_cr = true) const;
int to_int(bool& ok) const;
unsigned to_uint(bool& ok) const;
// Create a new substring view of this string view, starting either at the beginning of
// the given substring view, or after its end, and continuing until the end of this string
// view (that is, for the remaining part of its length). For example,
//
// StringView str { "foobar" };
// StringView substr = str.substring_view(1, 2); // "oo"
// StringView substr_from = str.substring_view_starting_from_substring(subst); // "oobar"
// StringView substr_after = str.substring_view_starting_after_substring(subst); // "bar"
//
// Note that this only works if the string view passed as an argument is indeed a substring
// view of this string view, such as one created by substring_view() and split_view(). It
// does not work for arbitrary strings; for example declaring substr in the example above as
//
// StringView substr { "oo" };
//
// would not work.
StringView substring_view_starting_from_substring(const StringView& substring) const;
StringView substring_view_starting_after_substring(const StringView& substring) const;
bool operator==(const char* cstring) const
{
if (is_null())
return !cstring;
if (!cstring)
return false;
size_t other_length = __builtin_strlen(cstring);
if (m_length != other_length)
return false;
return !__builtin_memcmp(m_characters, cstring, m_length);
}
bool operator!=(const char* cstring) const
{
return !(*this == cstring);
}
bool operator==(const String&) const;
bool operator==(const StringView& other) const
{
if (is_null())
return other.is_null();
if (other.is_null())
return false;
if (length() != other.length())
return false;
return !__builtin_memcmp(m_characters, other.m_characters, m_length);
}
bool operator!=(const StringView& other) const
{
return !(*this == other);
}
const StringImpl* impl() const { return m_impl; }
String to_string() const;
private:
friend class String;
const StringImpl* m_impl { nullptr };
const char* m_characters { nullptr };
size_t m_length { 0 };
};
}
using AK::StringView;
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